Home

Cisco Systems WSC2960XR48FPSI User's Manual

1. A Restrictions for VLANs Restrictions for VLANs The following are the restrictions for configuring VLANs e The switch supports homogeneous stacking but does not support mixed stacking Information About VLANs Logical Networks A VLAN is a switched network that is logically segmented by function project team or application without regard to the physical locations of the users VLANs have the same attributes as physical LANs but you can group end stations even if they are not physically located on the same LAN segment Any switch port can belong to a VLAN and unicast broadcast and multicast packets are forwarded and flooded only to end stations in the VLAN Each VLAN is considered a logical network and packets destined for stations that do not belong to the VLAN must be forwarded through a router or a switch supporting fallback bridging In a switch stack VLANs can be formed with ports across the stack Because a VLAN is considered a separate logical network it contains its own bridge Management Information Base MIB information and can support its own implementation of spanning tree Figure 3 VLANs as Logically Defined Networks Engineering Marketing Accounting VLAN VLAN VLAN q EN W A A y N Cisco router y f f Flor3 rey 1727 t Gigabit Ethernet j L Flor2 f t t f H g i l Fbor 1 7 x K PA a yy
2. Step 9 vlan vlan id Example Switch config vlan 502 Optional Enters VLAN configuration mode and designates or creates a VLAN that will be a community VLAN The VLAN ID range is 2 to 1001 and 1006 to 4094 Step 10 Step 11 private vlan community Example Switch config vlan private vlan community exit Designates the VLAN as a community VLAN Returns to global configuration mode Example Switch config vlan exit Step 12 vlan vlan id Example Switch config vlan 503 Enters VLAN configuration mode for the primary VLAN designated in Step 2 Step 13 private vlan association add remove secondary _vlan_list Example Switch config vlan private vlan association 501 503 Associates the secondary VLANs with the primary VLAN Step 14 Step 15 end Example Switch config vlan end Returns to privileged EXEC mode show vlan private vlan type or show interfaces status Example Switch config show vlan private vlan Verifies the configuration Step 16 copy running config startup config Saves your entries in the switch startup configuration file OL 29440 01 Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 i Configuring Private VLANs Configuring a Layer 2 Interface as a Private VLAN Host Port Command or Action Purpose Example To save the private VLAN co
3. switchport access vlan 19 switchport mode dotlq tunnel 12protocol tunnel point to point 12protocol tunnel point to point 12protocol tunnel drop threshold exit nterface gigabitethernet1 0 2 switchport access vlan 20 switchport mode dotlq tunnel 12protocol tunnel point to point 12protocol tunnel point to point 12protocol tunnel drop threshold exit nterface gigabitethernet1 0 3 pagp udld point to point pagp 1000 pagp udld point to point pagp 1000 switchport trunk encapsulation isl switchport mode trunk This example shows how to configure the customer switch at Site 1 Fast Ethernet interfaces 1 2 3 and 4 are set for IEEE 802 1Q trunking UDLD is enabled EtherChannel group 1 is enabled and the port channel is shut down and then enabled to activate the EtherChannel configuration Switc Switc Switc Switc Switc Switc Switc Switc Switc Switc Switc Switc Switc Switc h h h h h h h h h h h h h h config interface gigabitethernet1 0 1 switchport trunk encapsulation dotlq config if config if config if config if config if config i config if config if config if config if config if switchport mode trunk udld enable channel group 1 mode desirable exit nterface gigabitethernet1 0 2 switchport trunk encapsulation dotlq switchport mode trunk udld enable channel group 1 mode desirable exit config interface gigabitethernet1 0
4. If a packet has a VLAN ID that is the same as the outgoing port native VLAN ID the packet is sent untagged otherwise the switch sends the packet with a tag SUMMARY STEPS E Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 configure terminal interface interface id end eo FwWN gt switchport trunk native vlan vian id show interfaces interface id switchport copy running config startup config OL 29440 01 Configuring VLAN Trunks DETAILED STEPS Command or Action Configuring Trunk Ports for Load Sharing i Purpose Step 1 configure terminal Enters the global configuration mode Example Switch configure terminal Step 2 interface interface id Defines the interface that is configured as the IEEE 802 1Q trunk and enters interface configuration mode Example Switch config interface gigabitethernet1 0 2 Step 3 switchport trunk native vlan vian id Configures the VLAN that is sending and receiving untagged traffic on the trunk port Example For vian id the range is 1 to 4094 Switch config if switchport trunk native vlan 12 Step 4 end Returns to privileged EXEC mode Example Switch config if end Step 5 show interfaces interface id switchport Verifies your entries in the Trunking Native Mode VLAN field Example Switch show interfaces gigabitethernet1 0 2 switchport Step 6 copy running config startup config Optional Saves your entries in the configurat
5. port and the other end is configured as a tunnel port You assign the tunnel port interface to an access VLAN ID that is unique to each customer Figure 9 IEEE 802 10 Tunnel Ports in a Service Provider Network Customer A VENNS 1 to to a Customer A E a VLANs 1 to 100 802 1Q trunk part Ooo a m i bases Pa Service a al pee a i ae s A provider F 802 10 trunk port lt Tunnel port N 802 1Q trunk port VLAN 30 Tunnel port Pi Tunnel port VLAN 30 a VLAN 30 7 Trunk Trunk a a ports ports _ y Noi ae y gt Tunnel port Tunnel port s X VLAN 40 VLAN 40 802 10 trunk port Mee ghey we 802 10 ee port e ihe re a oe f aia ait fe Wa E ee 3 g Customer B Tunk ET B VLANs 1 to 200 E VLANs 1 to 200 ee Asymmetric link Packets coming from the customer trunk port into the tunnel port on the service provider edge switch are normally IEEE 802 1Q tagged with the appropriate VLAN ID The tagged packets remain intact inside the switch and when they exit the trunk port into the service provider network they are encapsulated with another layer of an IEEE 802 1Q tag called the metro tag that contains the VLAN ID that is unique to the customer The original customer IEEE 802 1Q tag is preserved in the encapsulated packet Therefore packets entering the service provider network are double tagged with the outer metro tag containing the customer s access VLAN ID and the
6. Configuring IEEE 802 10 and Layer 2 Protocol Tunneling Feature History and Information for Tunneling Technical Assistance Description Link The Cisco Support website provides extensive online http www cisco com support resources including documentation and tools for troubleshooting and resolving technical issues with Cisco products and technologies To receive security and technical information about your products you can subscribe to various services such as the Product Alert Tool accessed from Field Notices the Cisco Technical Services Newsletter and Really Simple Syndication RSS Feeds Access to most tools on the Cisco Support website requires a Cisco com user ID and password Feature History and Information for Tunneling Cisco IOS 15 0 2 EX1 This feature was introduced Catalyst 2960 XR Switch VLAN Configuration Guide Cisco IOS Release 15 0 2 EX1 OL 29440 01 CHAPTER Configuring Voice VLANs e Finding Feature Information page 149 e Prerequisites for Voice VLANs page 149 e Restrictions for Voice VLANs page 150 e Information About Voice VLAN page 150 e How to Configure Voice VLAN page 153 e Monitoring Voice VLAN page 157 e Configuration Examples for Voice VLANs page 157 Where to Go Next page 158 Additional References page 159 e Feature History and Information for Voice VLAN page 160 Finding Feature Information Your software release may not suppo
7. Step 6 command keyword Lists the associated arguments for a keyword Example Switch config cdp holdtime lt 10 255 gt Length of time in sec must keep this packet that receiver Understanding Abbreviated Commands You need to enter only enough characters for the switch to recognize the command as unique This example shows how to enter the show configuration privileged EXEC command in an abbreviated form Switch show conf No and default Forms of Commands Almost every configuration command also has a no form In general use the no form to disable a feature or function or reverse the action of a command For example the no shutdown interface configuration command reverses the shutdown of an interface Use the command without the keyword no to reenable a disabled feature or to enable a feature that is disabled by default Configuration commands can also have a default form The default form of a command returns the command setting to its default Most commands are disabled by default so the default form is the same as the no form However some commands are enabled by default and have variables set to certain default values In these cases the default command enables the command and sets variables to their default values CLI Error Messages E Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 This table lists some error messages that you might encounter while using the CLI to con
8. XY Note Ifthe NVRAM and DRAM storage is sufficient all switches in a VTP domain should be in VTP server mode A Caution Do not configure a VTP domain if all switches are operating in VTP client mode If you configure the domain it is impossible to make changes to the VLAN configuration of that domain Make sure that you configure at least one switch in the VTP domain for VTP server mode Passwords for the VTP Domain You can configure a password for the VTP domain but it is not required If you do configure a domain password all domain switches must share the same password and you must configure the password on each switch in the management domain Switches without a password or with the wrong password reject VTP advertisements If you configure a VTP password for a domain a switch that is booted without a VTP configuration does not accept VTP advertisements until you configure it with the correct password After the configuration the switch accepts the next VTP advertisement that uses the same password and domain name in the advertisement If you are adding a new switch to an existing network with VTP capability the new switch learns the domain name only after the applicable password has been configured on it A Caution When you configure a VTP domain password the management domain does not function properly if you do not assign a management domain password to each switch in the domain Catalyst 2960 XR
9. Configuring Voice VLANs Figure 15 Cisco 7960 IP Phone Connected to aSwitch Cisco IP Phone 7960 Hi S f 4 Phone asic N P2 ian P1 Sport P3 switch Access port Cisco IP Phone Voice Traffic Cisco IP Phone Voice Traffic PC 101351 You can configure an access port with an attached Cisco IP Phone to use one VLAN for voice traffic and another VLAN for data traffic from a device attached to the phone You can configure access ports on the switch to send Cisco Discovery Protocol CDP packets that instruct an attached phone to send voice traffic to the switch in any of these ways e In the voice VLAN tagged with a Layer 2 CoS priority value e In the access VLAN tagged with a Layer 2 CoS priority value e In the access VLAN untagged no Layer 2 CoS priority value Note In all configurations the voice traffic carries a Layer 3 IP precedence value the default is 5 for voice traffic and 3 for voice control traffic Related Topics Configuring Cisco IP Phone Voice Traffic on page 153 Example Configuring Cisco IP Phone Voice Traffic on page 157 Cisco IP Phone Data Traffic The switch can also process tagged data traffic traffic in IEEE 802 1Q or IEEE 802 1p frame types from the device attached to the access port on the Cisco IP Phone You can configure Layer 2 access ports on the switch to send CDP packets that instruct the attached phone to configure the phone access port i
10. and 2 do not propagate private VLAN configuration You must configure private VLANs on each device where you want private VLAN ports unless the devices are running VTP version 3 e You cannot configure VLAN 1 or VLANs 1002 to 1005 as primary or secondary VLANs Extended VLANs VLAN IDs 1006 to 4094 can belong to private VLANs e A primary VLAN can have one isolated VLAN and multiple community VLANs associated with it An isolated or community VLAN can have only one primary VLAN associated with it e Although a private VLAN contains more than one VLAN only one Spanning Tree Protocol STP instance runs for the entire private VLAN When a secondary VLAN is associated with the primary VLAN the STP parameters of the primary VLAN are propagated to the secondary VLAN e You can enable DHCP snooping on private VLANs When you enable DHCP snooping on the primary VLAN it is propagated to the secondary VLANs If you configure DHCP on a secondary VLAN the configuration does not take effect if the primary VLAN is already configured e When you enable IP source guard on private VLAN ports you must enable DHCP snooping on the primary VLAN e We recommend that you prune the private VLANs from the trunks on devices that carry no traffic in the private VLANs e You can apply different quality of service QoS configurations to primary isolated and community VLANs e Note the following considerations for sticky ARP e Sticky ARP entries are those
11. spanning tree instances spanning tree can be enabled on 128 VLANs and is disabled on the remaining VLANs If you have already used all available spanning tree instances on a switch adding another VLAN anywhere in the VTP domain creates a VLAN on that switch that is not running spanning tree If you have the default allowed list on the trunk ports of that switch which is to allow all VLANs the new VLAN is carried on all trunk ports Depending on the topology of the network this could create a loop in the new VLAN that would not be broken particularly if there are several adjacent switches that all have run out of spanning tree instances You can prevent this possibility by setting allowed lists on the trunk ports of switches that have used up their allocation of spanning tree instances If the number of VLANs on the switch exceeds the number of supported spanning tree instances we recommend that you configure the IEEE 802 1s Multiple STP MSTP on your switch to map multiple VLANs to a single spanning tree instance e When a switch in a stack learns a new VLAN or deletes or modifies an existing VLAN either through VTP over network ports or through the CLI the VLAN information is communicated to all stack members e When a switch joins a stack or when stacks merge VTP information the vlan dat file on the new switches will be consistent with the active switch Related Topics Creating or Modifying an Ethernet VLAN on page 47 Example Cr
12. Configuration Examples 57 Example Creating a VLAN Name 57 Example Configuring a Port as Access Port 57 Example Creating an Extended Range VLAN 57 Where to Go Next 58 Additional References 58 Feature History and Information for VLAN 59 CHAPTER 4 Configuring VLAN Trunks 61 Finding Feature Information 61 Prerequisites for VLAN Trunks 61 Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 OL 29440 01 Contents Restrictions for VLAN Trunks 62 Information About VLAN Trunks 62 Trunking Overview 62 Trunking Modes 62 Layer 2 Interface Modes 63 Allowed VLANs on a Trunk 64 Load Sharing on Trunk Ports 64 Network Load Sharing Using STP Priorities 64 Network Load Sharing Using STP Path Cost 65 Feature Interactions 66 Default Layer 2 Ethernet Interface VLAN Configuration 66 How to Configure VLAN Trunks 67 Configuring an Ethernet Interface as a Trunk Port 67 Configuring a Trunk Port 67 Defining the Allowed VLANs on a Trunk 69 Changing the Pruning Eligible List 71 Configuring the Native VLAN for Untagged Traffic 72 Configuring Trunk Ports for Load Sharing 73 Configuring Load Sharing Using STP Port Priorities 73 Configuring Load Sharing Using STP Path Cost 77 Configuration Examples for VLAN Trunking 80 Example Configuring an IEEE 802 1Q Trunk 80 Example Removing a VLAN 81 Where to Go Next 81 Additional References 81 Feature History and Information for VLAN Trunks 82 CHAPTER 5 Configuring Private
13. If routing is enabled on a switch virtual interface SVI that includes tunnel ports untagged IP packets received from the tunnel port are recognized and routed by the switch Customers can access the Internet through its native VLAN If this access is not needed you should not configure SVIs on VLANs that include tunnel ports e Fallback bridging is not supported on tunnel ports Because all IEEE 802 1Q tagged packets received from a tunnel port are treated as non IP packets if fallback bridging is enabled on VLANs that have tunnel ports configured IP packets would be improperly bridged across VLANs Therefore you must not enable fallback bridging on VLANs with tunnel ports Tunnel ports do not support IP access control lists ACLs e Layer 3 quality of service QoS ACLs and other QoS features related to Layer 3 information are not supported on tunnel ports MAC based QoS is supported on tunnel ports EtherChannel port groups are compatible with tunnel ports as long as the IEEE 802 1Q configuration is consistent within an EtherChannel port group e Port Aggregation Protocol PAgP Link Aggregation Control Protocol LACP and UniDirectional Link Detection UDLD are supported on IEEE 802 1Q tunnel ports e Dynamic Trunking Protocol DTP is not compatible with IEEE 802 1Q tunneling because you must manually configure asymmetric links with tunnel ports and trunk ports e VLAN Trunking Protocol VTP does not work between devices
14. VLANs 8 10 priority 128 h Switch B a Trunk 1 carries traffic for VLANs 8 through 10 and Trunk 2 carries traffic for VLANs 3 through 6 If the active trunk fails the trunk with the lower priority takes over and carries the traffic for all of the VLANs No duplication of traffic occurs over any trunk port Related Topics Configuring Load Sharing Using STP Port Priorities on page 73 Network Load Sharing Using STP Path Cost You can configure parallel trunks to share VLAN traffic by setting different path costs on a trunk and associating the path costs with different sets of VLANs blocking different ports for different VLANs The VLANs keep the traffic separate and maintain redundancy in the event of a lost link Trunk ports 1 and 2 are configured as 1 OOBASE T ports These VLAN path costs are assigned e VLANs 2 through 4 are assigned a path cost of 30 on Trunk port 1 e VLANs 8 through 10 retain the default 1 OOBASE T path cost on Trunk port 1 of 19 e VLANs 8 through 10 are assigned a path cost of 30 on Trunk port 2 e VLANs 2 through 4 retain the default 1 OOBASE T path cost on Trunk port 2 of 19 Figure 5 Load Sharing Trunks with Traffic Distributed by Path Cost Switch A Trunk port 1 Trunk port 2 VLANs 2 4 path cost 30 VLANs 8 10 path cost 30 VLANs 8 10 path cost 19 VLANs 2 4 path cost 19 3 Switch B Related Topics Configuring Load Sharing Using STP Path Cost on page 77 Catalyst 2960 XR
15. configure terminal Switch config vlan 20 Switch config vlan name test20 Switch config vlan end Related Topics Creating or Modifying an Ethernet VLAN on page 47 Normal Range VLAN Configuration Guidelines on page 44 Example Configuring a Port as Access Port This example shows how to configure a port as an access port in VLAN 2 Switch configure terminal Enter configuration commands one per line End with CNTL Z Switch config interface gigabitethernet2 0 1 Switch config if switchport mode access Switch config if switchport access vlan 2 Switch config if end Related Topics Assigning Static Access Ports to a VLAN on page 50 Example Creating an Extended Range VLAN This example shows how to create a new extended range VLAN with all default characteristics enter VLAN configuration mode and save the new VLAN in the switch startup configuration file Switch config vtp mode transparent Switch config vlan 2000 Switch config vlan end Switch copy running config startup config Related Topics Creating an Extended Range VLAN on page 52 Extended Range VLAN Configuration Guidelines on page 45 Catalyst 2960 XR Switch VLAN Configuration Guide Cisco IOS Release 15 0 2 EX1 OL 29440 01 Configuring VLANs Where to Go Next Where to Go Next After configuring VLANs you can configure the following e VLAN Trunking Protocol VTP e VLAN trunks e Private VLANs e VLAN Member
16. copy running config startup config Catalyst 2960 XR Switch VLAN Configuration Guide Cisco IOS Release 15 0 2 EX1 OL 29440 01 Configuring VMPS Configuring Dynamic Access Ports on VMPS Clients DETAILED STEPS Command or Action Purpose Step 1 configure terminal Enters the global configuration mode Example Switch configure terminal Step 2 vmps server ipaddress primary Enters the IP address of the switch acting as the primary VMPS server Example Switch config vmps server 10 1 2 3 primary Step 3 vmps server ipaddress Optional Enters the IP address of the switch acting as a secondary VMPS server Example You can enter up to three secondary server addresses Switch config vmps server 10 3 4 5 Step 4 end Returns to privileged EXEC mode Example Switch config end Step 5 show vmps Verifies your entries in the VMPS Domain Server field of the display Example Switch show vmps Step 6 copy running config startup config Optional Saves your entries in the configuration file Example Switch copy running config startup config Configuring Dynamic Access Ports on VMPS Clients A Caution Dynamic access port VLAN membership is for end stations or hubs connected to end stations Connecting dynamic access ports to other switches can cause a loss of connectivity OL 29440 01 Catalyst 2960 XR Switch VLAN Configuration Guide Cisco IOS Release 15 0 2 EX1 m Configuring VMPS
17. over trunk links VTP server is the default mode In VTP server mode VLAN configurations are saved in NVRAM If the switch detects a failure while writing a configuration to NVRAM VTP mode automatically changes from server mode to client mode If this happens the switch cannot be returned to VTP server mode until the NVRAM is functioning VTP client A VTP client functions like a VTP server and transmits and receives VTP updates on its trunks but you cannot create change or delete VLANs on a VTP client VLANs are configured on another switch in the domain that is in server mode In VTP versions 1 and 2 in VTP client mode VLAN configurations are not saved in NVRAM In VTP version 3 VLAN configurations are saved in NVRAM in client mode OL 29440 01 Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 Configuring VTP VTP Advertisements VTP Mode Description VTP transparent VTP transparent switches do not participate in VTP A VTP transparent switch does not advertise its VLAN configuration and does not synchronize its VLAN configuration based on received advertisements However in VTP version 2 or version 3 transparent switches do forward VTP advertisements that they receive from other switches through their trunk interfaces You can create modify and delete VLANs on a switch in VTP transparent mode In VTP versions 1 and 2 the switch must be in VTP trans
18. to scale their topologies to include all remote sites as well as the local sites STP must run properly and every VLAN should build a proper spanning tree that includes the local site and all remote sites across the service provider network Cisco Discovery Protocol CDP must discover neighboring Cisco devices from local and remote sites VLAN Trunking Protocol VTP must provide consistent VLAN configuration throughout all sites in the customer network When protocol tunneling is enabled edge switches on the inbound side of the service provider network encapsulate Layer 2 protocol packets with a special MAC address and send them across the service provider network Core switches in the network do not process these packets but forward them as normal packets Layer 2 protocol data units PDUs for CDP STP or VTP cross the service provider network and are delivered to customer switches on the outbound side of the service provider network Identical packets are received by all customer ports on the same VLANs with these results e Users on each of a customer s sites can properly run STP and every VLAN can build a correct spanning tree based on parameters from all sites and not just from the local site e CDP discovers and shows information about the other Cisco devices connected through the service provider network e VTP provides consistent VLAN configuration throughout the customer network propagating to all switches through the service provid
19. 15 0 2 EX1 Bl Configuring VTP Configuring a VTP Version 3 Password Command or Action Purpose Step 7 copy running config startup config Optional Saves the configuration in the startup configuration file Only VTP mode and domain name are saved in the switch running Example configuration and can be copied to the startup configuration file Switch copy running config startup config Related Topics VTP Modes on page 15 Example Configuring the Switch as a VTP Server on page 35 Configuring a VIP Version 3 Password You can configure a VTP version 3 password on the switch SUMMARY STEPS 1 configure terminal 2 vtp password password hidden secret 3 end 4 show vtp password 5 copy running config startup config DETAILED STEPS Command or Action Purpose Step 1 configure terminal Enters the global configuration mode Example Switch configure terminal Step 2 vtp password password hidden secret _ Optional Sets the password for the VTP domain The password can be 8 to 64 characters Examjpie Optional hidden Saves the secret key generated from the Switch config vtp password mypassword password string in the nram vlan dat file If you configure a hidden takeover by configuring a VTP primary server you are prompted to reenter the password e Optional secret Directly configures the password The secret password must contain 32 hexadecimal characters Ca
20. 15 0 2 EX1 E Configuring VLAN Trunks Configuring an Ethernet Interface as a Trunk Port DETAILED STEPS Command or Action Purpose Step 1 configure terminal Enters the global configuration mode Example Switch configure terminal Step 2 interface interface id Specifies the port to be configured and enters interface configuration mode Example Switch config interface gigabitethernet1 0 1 Step 3 switchport mode trunk Configures the interface as a VLAN trunk port Example Switch config if switchport mode trunk Step 4 switchport trunk allowed vlan add all except Optional Configures the list of VLANs allowed on the trunk mone remove vian list The vlan list parameter is either a single VLAN number from 1 to 4094 or a range of VLANs described by two VLAN numbers Example the lower one first separated by a hyphen Do not enter any Switch config if switchport trunk allowed SPaces between comma separated VLAN parameters or in vlan remove 2 hyphen specified ranges All VLANs are allowed by default Step 5 end Returns to privileged EXEC mode Example Switch config end Step 6 show interfaces interface id switchport Verifies your entries in the Trunking VLANs Enabled field of the display Example Switch show interfaces gigabitethernet1 0 1 Step 7 copy running config startup config Optional Saves your entries in the configuration file Example Switch copy running config startup
21. 802 1x enabled port to dynamic the port mode is not changed Related Topics Configuring a Trunk Port on page 67 Example Configuring an IEEE 802 1Q Trunk on page 80 Default Layer 2 Ethernet Interface VLAN Configuration The following table shows the default Layer 2 Ethernet interface VLAN configuration Table 11 Default Layer 2 Ethernet Interface VLAN Configuration Feature Default Setting Interface mode switchport mode dynamic auto Trunk encapsulation switchport trunk encapsulation negotiate Allowed VLAN range VLANs 1 to 4094 Catalyst 2960 XR Switch VLAN Configuration Guide Cisco IOS Release 15 0 2 EX1 OL 29440 01 Configuring VLAN Trunks How to Configure VLAN Trunks i Feature Default Setting VLAN range eligible for pruning VLANs 2 to 1001 Default VLAN for access ports VLAN 1 Native VLAN for IEEE 802 1Q trunks VLAN 1 How to Configure VLAN Trunks To avoid trunking misconfigurations configure interfaces connected to devices that do not support DTP to not forward DTP frames that is to turn off DTP If you do not intend to trunk across those links use the switchport mode access interface configuration command to disable trunking e To enable trunking to a device that does not support DTP use the switchport mode trunk and switchport nonegotiate interface configuration commands to cause the interface to become a trunk but to not generate DTP frames Configurin
22. DETAILED STEPS Step 1 terminal no history Disables the feature during the current terminal session in the privileged EXEC mode Example Switch terminal no history Enabling and Disabling Editing Features Although enhanced editing mode is automatically enabled you can disable it and reenable it SUMMARY STEPS 1 terminal editing 2 terminal no editing DETAILED STEPS Command or Action Purpose Step 1 terminal editing Reenables the enhanced editing mode for the current terminal session in the privileged EXEC mode Example Switch terminal editing Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 OL 29440 01 Using the Command Line Interface Enabling and Disabling Editing Features Command or Action Purpose Step 2 terminal no editing Example Switch terminal no editing Disables the enhanced editing mode for the current terminal session in the privileged EXEC mode Editing Commands through Keystrokes E Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 The keystrokes help you to edit the command lines These keystrokes are optional X Note The arrow keys function only on ANSI compatible terminals such as VT100s Table 3 Editing Commands Editing Commands Description Ctrl B or use the left arrow key Moves the cursor back one character Ctrl F or use the right arrow key Moves the cursor
23. NAMED SUPPLIERS DISCLAIM ALL WARRANTIES EXPRESSED OR IMPLIED INCLUDING WITHOUT LIMITATION THOSE OF MERCHANTABILITY FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OR ARISING FROM A COURSE OF DEALING USAGE OR TRADE PRACTICE IN NO EVENT SHALL CISCO OR ITS SUPPLIERS BE LIABLE FOR ANY INDIRECT SPECIAL CONSEQUENTIAL OR INCIDENTAL DAMAGES INCLUDING WITHOUT LIMITATION LOST PROFITS OR LOSS OR DAMAGE TO DATA ARISING OUT OF THE USE OR INABILITY TO USE THIS MANUAL EVEN IF CISCO OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES Any Internet Protocol IP addresses and phone numbers used in this document are not intended to be actual addresses and phone numbers Any examples command display output network topology diagrams and other figures included in the document are shown for illustrative purposes only Any use of actual IP addresses or phone numbers in illustrative content is unintentional and coincidental Cisco and the Cisco logo are trademarks or registered trademarks of Cisco and or its affiliates in the U S and other countries To view a list of Cisco trademarks go to this URL http www cisco com go trademarks Third party trademarks mentioned are the property of their respective owners The use of the word partner does not imply a partnership relationship between Cisco and any other company 1110R 2013 Cisco Systems Inc All rights reserved ee CONTENTS Preface Preface
24. Server VMPS Tunneling e Voice VLANs Additional References Related Documents Related Topic Document Title For complete syntax and usage information for the Catalyst 2960 XR Switch VLAN Management commands used in this chapter Command Reference Standards and RFCs Standard RFC Title Catalyst 2960 XR Switch VLAN Configuration Guide Cisco IOS Release 15 0 2 EX1 OL 29440 01 Configuring VTP Feature History and Information for VIP i MIBs MIB MIBs Link All supported MIBs for this release To locate and download MIBs for selected platforms Cisco IOS releases and feature sets use Cisco MIB Locator found at the following URL http www cisco com go mibs Technical Assistance Description Link The Cisco Support website provides extensive online http www cisco com support resources including documentation and tools for troubleshooting and resolving technical issues with Cisco products and technologies To receive security and technical information about your products you can subscribe to various services such as the Product Alert Tool accessed from Field Notices the Cisco Technical Services Newsletter and Really Simple Syndication RSS Feeds Access to most tools on the Cisco Support website requires a Cisco com user ID and password Feature History and Information for VTP Release Modification Cisco IOS 15 0 2 EX1 This feat
25. Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 OL 29440 01 Configuring VLAN Trunks Feature Interactions Feature Interactions Trunking interacts with other features in these ways A trunk port cannot be a secure port A trunk port cannot be a tunnel port Trunk ports can be grouped into EtherChannel port groups but all trunks in the group must have the same configuration When a group is first created all ports follow the parameters set for the first port to be added to the group If you change the configuration of one of these parameters the switch propagates the setting that you entered to all ports in the group e Allowed VLAN list STP port priority for each VLAN STP Port Fast setting Trunk status If one port in a port group ceases to be a trunk all ports cease to be trunks e We recommend that you configure no more than 24 trunk ports in Per VLAN Spanning Tree PVST mode and no more than 40 trunk ports in Multiple Spanning Tree MST mode e If you try to enable IEEE 802 1x on a trunk port an error message appears and IEEE 802 1x is not enabled If you try to change the mode of an IEEE 802 1x enabled port to trunk the port mode is not changed e A port in dynamic mode can negotiate with its neighbor to become a trunk port If you try to enable IEEE 802 1x on a dynamic port an error message appears and IEEE 802 1x is not enabled If you try to change the mode of an IEEE
26. Syndication RSS feed and set content to be delivered directly to your desktop using a reader application The RSS feeds are a free service and Cisco currently supports RSS version 2 0 Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 OL 29440 01 Preface A Obtaining Documentation and Submitting a Service Request Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 OL 29440 01 CHAPTER 1 Using the Command Line Interface This chapter contains the following topics Information About Using the Command Line Interface page 1 e How to Use the CLI to Configure Features page 5 Information About Using the Command Line Interface This section describes the Cisco IOS command line interface CLI and how to use it to configure your switch Command Modes The Cisco IOS user interface is divided into many different modes The commands available to you depend on which mode you are currently in Enter a question mark at the system prompt to obtain a list of commands available for each command mode You can start a CLI session through a console connection through Telnet a SSH or by using the browser When you start a session you begin in user mode often called user EXEC mode Only a limited subset of the commands are available in user EXEC mode For example most of the user EXEC commands are one time commands such as show commands which show the current co
27. VLAN Interface Command or Action Purpose mapping 20 add 501 503 single private VLAN ID or a hyphenated range of private VLAN IDs Enter a secondary_vian_list or use the add keyword with a secondary_vlan_listto map the secondary VLANs to the private VLAN promiscuous port Use the remove keyword with a secondary_vlan_list to clear the mapping between secondary VLANs and the private VLAN promiscuous port Step 5 end Example Switch config if end Returns to privileged EXEC mode Step 6 Step 7 show interfaces interface id switchport Example Switch show interfaces gigabitethernet1 0 2 switchport copy running config startup config Example Switch copy running config startup config Verifies the configuration Saves your entries in the switch startup configuration file Related Topics Private VLANs Ports on page 88 Example Configuring an Interface as a Private VLAN Promiscuous Port on page 103 Mapping Secondary VLANs to a Primary VLAN Layer 3 VLAN Interface If the private VLAN will be used for inter VLAN routing you configure an SVI for the primary VLAN and map secondary VLANs to the SVI Isolated and community VLANs are both secondary VLANs The private vlan mapping interface configuration command only affects private VLAN traffic that is Layer 3 switched Beginning in privileged EXEC mode follow these steps to map secondary VLANs to the SVI of a primar
28. VLANs 83 Finding Feature Information 83 Prerequisites for Private VLANs 83 Secondary and Primary VLAN Configuration 84 Private VLAN Port Configuration 85 Restrictions for Private VLANs 86 Limitations with Other Features 86 Information About Private VLANs 87 Catalyst 2960 XR Switch VLAN Configuration Guide Cisco IOS Release 15 0 2 EX1 OL 29440 01 Contents Private VLAN Domains 87 Secondary VLANs 88 Private VLANs Ports 88 Private VLANs in Networks 89 IP Addressing Scheme with Private VLANs 90 Private VLANs Across Multiple Switches 90 Private VLAN Interaction with Other Features 91 Private VLANs and Unicast Broadcast and Multicast Traffic 91 Private VLANs and SVIs 92 Private VLANs and Switch Stacks 92 Private VLAN Configuration Tasks 92 Default Private VLAN Configuration 93 How to Configure Private VLANs 93 Configuring and Associating VLANs in a Private VLAN 93 Configuring a Layer 2 Interface as a Private VLAN Host Port 96 Configuring a Layer 2 Interface as a Private VLAN Promiscuous Port 98 Mapping Secondary VLANs to a Primary VLAN Layer 3 VLAN Interface 99 Monitoring Private VLANs 101 Configuration Examples for Private VLANs 102 Example Configuring a Primary VLAN Isolated VLAN and a Community of VLANs 102 Example Configuring an Interface as a Host Port 102 Example Configuring an Interface as a Private VLAN Promiscuous Port 103 Example Mapping Secondary VLANs to a Primary VLAN Interface 103 Example Moni
29. a takeover command in the domain When you enter the secret keyword you can directly configure the password secret key e Support for extended range VLAN VLANs 1006 to 4094 database propagation VTP versions 1 and 2 propagate only VLANs 1 to 1005 If extended VLANs are configured you cannot convert from VTP version 3 to version or 2 Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 OL 29440 01 Configuring VTP A VTP Pruning VTP Pruning amp Note VTP pruning still applies only to VLANSs 1 to 1005 and VLANSs 1002 to 1005 are still reserved and cannot be modified e Private VLAN support e Support for any database in a domain lIn addition to propagating VTP information version 3 can propagate Multiple Spanning Tree MST protocol database information A separate instance of the VTP protocol runs for each application that uses VTP e VTP primary server and VTP secondary servers A VTP primary server updates the database information and sends updates that are honored by all devices in the system A VTP secondary server can only back up the updated VTP configurations received from the primary server to its NVRAM By default all devices come up as secondary servers You can enter the vtp primary privileged EXEC command to specify a primary server Primary server status is only needed for database updates when the administrator issues a takeover message in the domain You can have
30. as Access Port on page 57 Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 OL 29440 01 Configuring VLANs A How to Configure Extended Range VLANs How to Configure Extended Range VLANs With VTP version and version 2 when the switch is in VTP transparent mode VTP disabled you can create extended range VLANs in the range 1006 to 4094 VTP 3 version supports extended range VLANs in server or transparent move Extended range VLANs enable service providers to extend their infrastructure to a greater number of customers The extended range VLAN IDs are allowed for any switchport commands that allow VLAN IDs With VTP version 1 or 2 extended range VLAN configurations are not stored in the VLAN database but because VTP mode is transparent they are stored in the switch running configuration file and you can save the configuration in the startup configuration file Extended range VLANs created in VTP version 3 are stored in the VLAN database You can change only the MTU size private VLAN and the remote SPAN configuration state on extended range VLANs all other characteristics must remain at the default state Creating an Extended Range VLAN amp You create an extended range VLAN in global configuration mode by entering the vlan global configuration command with a VLAN ID from 1006 to 4094 The extended range VLAN has the default Ethernet VLAN characteristics and the MTU size and RSPAN co
31. config access list 101 permit tep SPaces to the left and redisplayed The dollar sign shows that the 10 15 22 25 255 255 255 0 10 15 22 35 line has been scrolled to the left Each time the cursor reaches the end Switch config 101 permit tcp of the line the line is again shifted ten spaces to the left 10 15 22 25 255 255 255 0 10 15 22 35 255 25 Switch config t tcp 10 15 22 25 255 255 255 0 131 108 1 20 255 255 255 0 eq Switch config 15 22 25 255 255 255 0 10 15 22 35 255 255 255 0 eq 45 Step 2 Ctrl A Checks the complete syntax The dollar sign appears at the end of the line to show that the line Example has been scrolled to the right Switch config access list 101 permit tcp 10 15 22 25 255 255 255 0 10 15 28 Step 3 Return key Execute the commands The software assumes that you have a terminal screen that is 80 columns wide If you have a different width use the terminal width privileged EXEC command to set the width of your terminal Use line wrapping with the command history feature to recall and modify previous complex command entries Searching and Filtering Output of show and more Commands You can search and filter the output for show and more commands This is useful when you need to sort through large amounts of output or if you want to exclude output that you do not need to see Using these commands is optional SUMMARY STEPS 1 show more command begin include exclude regul
32. consecutive VLAN IDs with a comma and no spaces use a hyphen to designate a range of IDs Valid IDs are 2 to 1001 Extended range VLANs VLAN IDs 1006 to 4094 cannot be pruned VLANs that are pruning ineligible receive flooded traffic The default list of VLANs allowed to be pruned contains VLANs 2 to 1001 Note To return to the default pruning eligible list of all VLANs use the no switchport trunk pruning vlan interface configuration command OL 29440 01 Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 m Configuring VLAN Trunks Configuring an Ethernet Interface as a Trunk Port Command or Action Purpose Step 4 end Example Switch config end Returns to privileged EXEC mode Step 5 show interfaces interface id switchport Example Switch show interfaces gigabitethernet2 0 1 switchport Verifies your entries in the Pruning VLANs Enabled field of the display Step 6 copy running config startup config Example Switch copy running config startup config Optional Saves your entries in the configuration file Configuring the Native VLAN for Untagged Traffic A trunk port configured with IEEE 802 1Q tagging can receive both tagged and untagged traffic By default the switch forwards untagged traffic in the native VLAN configured for the port The native VLAN is VLAN 1 by default The native VLAN can be assigned any VLAN ID
33. domain and then modifies its configuration accordingly e When you configure the switch for VTP transparent mode VTP is disabled on the switch The switch does not send VTP updates and does not act on VTP updates received from other switch However a VTP transparent switch running VTP version 2 does forward received VTP advertisements on its trunk links e VTP off mode is the same as VTP transparent mode except that VTP advertisements are not forwarded When you configure a domain name it cannot be removed you can only reassign a switch to a different domain SUMMARY STEPS end Bh S2 a Ne configure terminal vtp domain domain name vtp password password show vtp status copy running config startup config vtp mode client server transparent off vlan mst unknown E Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 OL 29440 01 Configuring VTP Configuring VTP Mode DETAILED STEPS Command or Action Purpose Step 1 configure terminal Enters the global configuration mode Example Switch configure terminal Step 2 vtp domain domain name Configures the VTP administrative domain name The name can be 1 to 32 characters All switches operating in VTP server or client mode under the Example same administrative responsibility must be configured with the same domain name Switch config vtp domain eng_group This command is optional for modes other th
34. element indicates that the element can be repeated A vertical line called a pipe indicates a choice within a set of keywords or arguments OL 29440 01 Catalyst 2960 XR Switch VLAN Configuration Guide Cisco IOS Release 15 0 2 EX1 E Preface A Document Conventions Convention Description x y Optional alternative keywords are grouped in brackets and separated by vertical bars x y Required alternative keywords are grouped in braces and separated by vertical bars x y z Nested set of square brackets or braces indicate optional or required choices within optional or required elements Braces and a vertical bar within square brackets indicate a required choice within an optional element string A nonquoted set of characters Do not use quotation marks around the string or the string will include the quotation marks lt gt Nonprinting characters such as passwords are in angle brackets Default responses to system prompts are in square brackets 1 An exclamation point or a pound sign at the beginning of a line of code indicates a comment line X Reader Alert Conventions This document uses the following conventions for reader alerts Note p Means reader take note Notes contain helpful suggestions or references to material not covered in the manual Tip A Means the following information will help you solve a problem Ca
35. enable it VTP pruning does not prune traffic from VLANs that are pruning ineligible VLAN 1 and VLANs 1002 to 1005 are always pruning ineligible traffic from these VLANs cannot be pruned Extended range VLANs VLAN IDs higher than 1005 are also pruning ineligible OL 29440 01 Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 m Configuring VTP VTP and Switch Stacks Related Topics Enabling VTP Pruning on page 29 VTP and Switch Stacks VTP configuration is the same in all members of a switch stack When the switch stack is in VTP server or client mode all switches in the stack carry the same VTP configuration When VTP mode is transparent the stack is not taking part in VTP e When a switch joins the stack it inherits the VTP and VLAN properties of the stack master e All VTP updates are carried across the stack e When VTP mode is changed in a switch in the stack the other switches in the stack also change VTP mode and the switch VLAN database remains consistent VTP version 3 functions the same on a standalone switch or a stack except when the switch stack is the primary server for the VTP database In this case the MAC address of the stack master is used as the primary server ID If the master switch reloads or is powered off a new stack master is elected e If you do not configure the persistent MAC address feature by entering the stack mac persistent timer 0 time value glo
36. forward one character Ctrl A Moves the cursor to the beginning of the command line Ctrl E Moves the cursor to the end of the command line Esc B Moves the cursor back one word Esc F Moves the cursor forward one word Ctrl T Transposes the character to the left of the cursor with the character located at the cursor Delete or Backspace key Erases the character to the left of the cursor Ctrl D Deletes the character at the cursor Ctrl K Deletes all characters from the cursor to the end of the command line Ctrl U or Ctrl X Deletes all characters from the cursor to the beginning of the command line Ctrl W Deletes the word to the left of the cursor OL 29440 01 Using the Command Line Interface Editing Command Lines That Wrap Enabling and Disabling Editing Features i Esc D Deletes from the cursor to the end of the word Esc C Capitalizes at the cursor Esc L Changes the word at the cursor to lowercase Esc U Capitalizes letters from the cursor to the end of the word Ctrl V or Esc Q Designates a particular keystroke as an executable command perhaps as a shortcut Return key Scrolls down a line or screen on displays that are longer than the terminal screen can display Note The More prompt is used for any output that has more lines than can be displayed on the terminal screen including show command output You can
37. inner VLAN ID being that of the incoming traffic When the double tagged packet enters another trunk port in a service provider core switch the outer tag is stripped as the switch processes the packet When the packet exits another trunk port on the same core switch the same metro tag is again added to the packet OL 29440 01 Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 m Configuring IEEE 802 10 and Layer 2 Protocol Tunneling IEEE 802 10 Tunneling This figure shows the tag structures of the double tagged packets Figure 10 Original Normal IEEE 802 10 and Double Tagged Ethernet Packet Formats Source address Destination Length Frame Check address Ether Type Sequence DA SA Len Etype Data FCS Original Ethernet frame customer network oa SA Etype Tag l Len Etype Data FCS IEE 802 1Q frame from m 407 DA SA Etype Tag Eype Tag Len Etype Data FCS Double tagged frame in service provider infrastructure When the packet enters the trunk port of the service provider egress switch the outer tag is again stripped as the switch internally processes the packet However the metro tag is not added when the packet is sent out the tunnel port on the edge switch into the customer network The packet is sent as a normal IEEE 802 1Q tagged frame to preserve the original VLAN numbers in the customer network In the abov
38. is allowed on the port the VMPS sends the client a vlan assignment response containing the assigned VLAN name and allowing access to the host Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 OL 29440 01 Configuring VMPS Dynamic Access Port VLAN Membership i e If the host is not allowed on the port and the VMPS is in open mode the VMPS sends an access denied response e If the VLAN is not allowed on the port and the VMPS is in secure mode the VMPS sends a port shutdown response If the port already has a VLAN assignment the VMPS provides one of these responses e If the VLAN in the database matches the current VLAN on the port the VMPS sends an success response allowing access to the host e If the VLAN in the database does not match the current VLAN on the port and active hosts exist on the port the VMPS sends an access denied or a port shutdown response depending on the secure mode of the VMPS If the switch receives an access denied response from the VMPS it continues to block traffic to and from the host MAC address The switch continues to monitor the packets directed to the port and sends a query to the VMPS when it identifies a new host address If the switch receives a port shutdown response from the VMPS it disables the port The port must be manually reenabled by using Network Assistant the CLI or SNMP Related Topics Configuring Dynamic Access Ports on VMPS Clients on p
39. isolated Gi2 0 1 10 502 community Gi2 0 11 10 503 non operational Where to Go Next You can configure the following e VIP e VLANs e VLAN trunking e VLAN Membership Policy Server VMPS Tunneling e Voice VLANs Additional References Related Documents Gi3 0 1 Gi3 0 2 Gi3 0 1 Gi3 0 4 Related Topic Document Title For complete syntax and usage information for the commands used in this chapter Standards and RFCs Catalyst 2960 XR Switch VLAN Management Command Reference Standard RFC Title E Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 OL 29440 01 Configuring Private VLANs MIBs MIB Feature History and Information for Private VLANs i MIBs Link All supported MIBs for this release To locate and download MIBs for selected platforms Cisco IOS releases and feature sets use Cisco MIB Locator found at the following URL http www cisco com go mibs Technical Assistance Description Link The Cisco Support website provides extensive online resources including documentation and tools for troubleshooting and resolving technical issues with Cisco products and technologies To receive security and technical information about your products you can subscribe to various services such as the Product Alert Tool accessed from Field Notices the Cisco Technical Services Newsletter and Reall
40. numbers 1002 through 1005 are reserved for Token Ring and FDDI VLANs e VLAN configuration for VLANs 1 to 1005 are always saved in the VLAN database If the VTP mode is transparent VTP and VLAN configuration are also saved in the switch running configuration file e If the switch is in VTP server or VTP transparent mode you can add modify or remove configurations for VLANs 2 to 1001 in the VLAN database VLAN IDs 1 and 1002 to 1005 are automatically created and cannot be removed e With VTP versions 1 and 2 the switch supports VLAN IDs 1006 through 4094 only in VTP transparent mode VTP disabled These are extended range VLANs and configuration options are limited Extended range VLANs created in VTP transparent mode are not saved in the VLAN database and are not propagated VTP version 3 supports extended range VLAN VLANs 1006 to 4094 database propagation in VTP server and transparent mode If extended VLANs are configured you cannot convert from VTP version 3 to version or 2 e Before you can create a VLAN the switch must be in VTP server mode or VTP transparent mode If the switch is a VTP server you must define a VTP domain or VTP will not function The switch does not support Token Ring or FDDI media The switch does not forward FDDI FDDI Net TrCRF or TrBRF traffic but it does propagate the VLAN configuration through VTP The switch supports 128 spanning tree instances If a switch has more active VLANs than supported
41. page 153 Cisco IP Phone Voice Traffic on page 151 Example Configuring a Port Connected to an IP Phone Not to Change Frame Priority This example shows how to configure a port connected to a Cisco IP Phone to not change the priority of frames received from the PC or the attached device Switch configure terminal Enter configuration commands one per line End with CNTL Z Switch config interface gigabitethernet1 0 1 Switch config if switchport priority extend trust Switch config if end Related Topics Configuring the Priority of Incoming Data Frames on page 155 Cisco IP Phone Data Traffic on page 151 Where to Go Next After configuring voice VLANs you can configure the following e VTP E Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 OL 29440 01 Configuring Voice VLANs Additional References i e VLANs e VLAN trunking e Private VLANs e VLAN Membership Policy Server VMPS Tunneling Additional References Related Documents For complete syntax and usage information for the Catalyst 2960 XR Switch VLAN Management commands used in this chapter Command Reference Standards and RFCs Standard RFC Title MIBs MIB MIBs Link All supported MIBs for this release To locate and download MIBs for selected platforms Cisco IOS releases and feature sets use Cisco MIB Locator found at the following URL http www cisco com go
42. ports assigned to that VLAN become inactive They remain associated with the VLAN and thus inactive until you assign them to a new VLAN SUMMARY STEPS configure terminal no vlan vlan id end fF wn show vlan brief DETAILED STEPS Command or Action Purpose Step 1 configure terminal Enters the global configuration mode Example Switch configure terminal Catalyst 2960 XR Switch VLAN Configuration Guide Cisco IOS Release 15 0 2 EX1 OL 29440 01 Configuring VLANs How to Configure Normal Range VLANs Command or Action Purpose Step 2 no vlan vian id Removes the VLAN by entering the VLAN ID Example Switch config no vlan 4 Step 3 end Returns to privileged EXEC mode Example Switch config end Step 4 show vlan brief Verifies the VLAN removal Example Switch show vlan brief Assigning Static Access Ports to a VLAN SUMMARY STEPS You can assign a static access port to a VLAN without having VTP globally propagate VLAN configuration information by disabling VTP VTP transparent mode If you are assigning a port on a cluster member switch to a VLAN first use the reommand privileged EXEC command to log in to the cluster member switch If you assign an interface to a VLAN that does not exist the new VLAN is created sO oO FW N configure terminal interface interface id switchport mode access switchport access vlan vlan id end show running config interfa
43. service provider network might overlap and traffic of customers through the infrastructure might be mixed Assigning a unique range of VLAN IDs to each customer would restrict customer configurations and could easily exceed the VLAN limit 4096 of the IEEE 802 1Q specification Using the IEEE 802 1Q tunneling feature service providers can use a single VLAN to support customers who have multiple VLANs Customer VLAN IDs are preserved and traffic from different customers is segregated within the service provider network even when they appear to be in the same VLAN Using IEEE 802 1Q tunneling expands VLAN space by using a VLAN in VLAN hierarchy and retagging the tagged packets A port configured to support IEEE 802 1Q tunneling is called a tunnel port When you configure tunneling you assign a tunnel port to a VLAN ID that is dedicated to tunneling Each customer requires a separate service provider VLAN ID but that VLAN ID supports all of the customer s VLANs Customer traffic tagged in the normal way with appropriate VLAN IDs comes from an IEEE 802 1Q trunk port on the customer device and into a tunnel port on the service provider edge switch The link between the customer device and the edge switch is asymmetric because one end is configured as an IEEE 802 1Q trunk Catalyst 2960 XR Switch VLAN Configuration Guide Cisco IOS Release 15 0 2 EX1 OL 29440 01 Configuring IEEE 802 10 and Layer 2 Protocol Tunneling IEEE 802 10 Tunneling
44. tag is set to the interface class of service CoS priority configured on the tunnel port The default is zero if none is configured On switches because 802 1Q tunneling is configured on a per port basis it does not matter whether the switch is a standalone switch or a stack member All configuration is done on the stack master Related Topics Configuring an IEEE 802 1Q Tunneling Port on page 133 Catalyst 2960 XR Switch VLAN Configuration Guide Cisco IOS Release 15 0 2 EX1 OL 29440 01 Configuring IEEE 802 10 and Layer 2 Protocol Tunneling IEEE 802 10 Tunneling Configuration Guidelines i Example Configuring an IEEE 802 1Q Tunneling Port on page 143 IEEE 802 10 Tunneling Configuration Guidelines When you configure IEEE 802 1Q tunneling you should always use an asymmetrical link between the customer device and the edge switch with the customer device port configured as an IEEE 802 1Q trunk port and the edge switch port configured as a tunnel port Assign tunnel ports only to VLANs that are used for tunneling Configuration requirements for native VLANs and for and maximum transmission units MTUs are explained in these next sections Native VLANs When configuring IEEE 802 1Q tunneling on an edge switch you must use IEEE 802 1Q trunk ports for sending packets into the service provider network However packets going through the core of the service provider network can be carried through IEEE 802 1Q trunks ISL tr
45. that have been sent and received show vtp devices conflict Displays information about all VTP version 3 devices in the domain Conflicts are VTP version 3 devices with conflicting primary servers The show vtp devices command does not display information when the switch is in transparent or off mode show vtp interface interface id Displays VTP status and configuration for all interfaces or the specified interface show vtp password Displays the VTP password The form of the password displayed depends on whether or not the hidden keyword was entered and if encryption is enabled on the switch show vtp status Displays the VTP switch configuration information OL 29440 01 Configuring VTP Configuration Examples for VTP i Configuration Examples for VTP Example Configuring the Switch as a VTP Server This example shows how to configure the switch as a VTP server with the domain name eng_group and the password mypassword Switch config vtp domain eng_group Setting VTP domain name to eng group Switch config vtp mode server Setting device to VTP Server mode for VLANS Switch config vtp password mypassword Setting device VLAN database password to mypassword Switch config end Related Topics Configuring VTP Mode on page 24 VTP Modes on page 15 Example Configuring a Hidden Password This example shows how to configure a hidden password and how it appea
46. through the port are checked again through the VQP with the VMPS before the port is assigned to a VLAN Dynamic access ports can be used for direct host connections or they can connect to a network A maximum of 20 MAC addresses are allowed per port on the switch A dynamic access port can belong to only one VLAN at a time but the VLAN can change over time depending on the MAC addresses seen Related Topics Configuring Dynamic Access Ports on VMPS Clients on page 111 Example VMPS Configuration on page 117 Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 OL 29440 01 Configuring VMPS A Default VMPS Client Configuration Default VMPS Client Configuration The following table shows the default VMPS and dynamic access port configuration on client switches Table 13 Default VMPS Client and Dynamic Access Port Configuration Feature Default Setting VMPS domain server None VMPS reconfirm interval 60 minutes VMPS server retry count 3 Dynamic access ports None configured How to Configure VMPS Entering the IP Address of the VMPS amp Note Ifthe VMPS is being defined for a cluster of switches enter the address on the command switch Before You Begin You must first enter the IP address of the server to configure the switch as a client SUMMARY STEPS configure terminal vmps server ipaddress primary vmps server ipaddress end show vmps eo Fw Dy
47. 1 or version 2 region e Devices that are only VTP version capable cannot interoperate with VTP version 3 devices Catalyst 2960 XR Switch VLAN Configuration Guide Cisco IOS Release 15 0 2 EX1 OL 29440 01 Configuring VTP Default VTP Configuration i e For VTP version 1 and version 2 if extended range VLANs are configured on the switch stack you cannot change VTP mode to client or server You receive an error message and the configuration is not allowed VTP version and version 2 do not propagate configuration information for extended range VLANs VLANs 1006 to 4094 You must manually configure these VLANs on each device amp Note For VTP version 1 and 2 before you create extended range VLANs VLAN IDs 1006 to 4094 you must set VTP mode to transparent by using the vtp mode transparent global configuration command Save this configuration to the startup configuration so that the switch starts in VTP transparent mode Otherwise you lose the extended range VLAN configuration if the switch resets and boots up in VTP server mode the default VTP version 3 supports extended range VLANs If extended VLANs are configured you cannot convert from VTP version 3 to VTP version 2 e If you configure the switch for VTP client mode the switch does not create the VLAN database file vlan dat If the switch is then powered off it resets the VTP configuration to the default To keep the VTP configuration with VTP client
48. 10S Release 15 0 2 EX1 OL 29440 01 Configuring Private VLANs Configuring and Associating VLANs in a Private VLAN DETAILED STEPS Command or Action Purpose Step 1 configure terminal Enters global configuration mode Example Switch configure terminal Step 2 vtp mode transparent Sets VTP mode to transparent disable VTP Example Switch config vtp mode transport Step 3 vlan vlan id Enters VLAN configuration mode and designates or creates a VLAN that will be the primary VLAN The VLAN ID range Example is 2 to 1001 and 1006 to 4094 Switch config vlan 20 Step 4 private vlan primary Designates the VLAN as the primary VLAN Example Switch config vlan private vlan primary Step 5 exit Returns to global configuration mode Example Switch config vlan exit Step 6 vlan vlan id Optional Enters VLAN configuration mode and designates or creates a VLAN that will be an isolated VLAN The VLAN Example ID range is 2 to 1001 and 1006 to 4094 Switch config vlan 501 Step 7 private vlan isolated Designates the VLAN as an isolated VLAN Example Switch config vlan private vlan isolated Step 8 exit Returns to global configuration mode Example Switch config vlan exit E Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 OL 29440 01 Configuring Private VLANs Configuring and Associating VLANs in a Private VLAN Command or Action Purpose
49. 144 Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 OL 29440 01 Configuring IEEE 802 10 and Layer 2 Protocol Tunneling Layer 2 Tunneling for EtherChannels Layer 2 Tunneling for EtherChannels To configure Layer 2 point to point tunneling to facilitate the automatic creation of EtherChannels you need to configure both the SP service provider edge switch and the customer switch Related Topics Configuring Layer 2 Protocol Tunneling on page 135 Example Configuring Layer 2 Protocol Tunneling on page 144 Information about Tunneling IEEE 802 10 and Layer 2 Protocol Overview Virtual private networks VPNs provide enterprise scale connectivity on a shared infrastructure often Ethernet based with the same security prioritization reliability and manageability requirements of private networks Tunneling is a feature designed for service providers who carry traffic of multiple customers across their networks and are required to maintain the VLAN and Layer 2 protocol configurations of each customer without impacting the traffic of other customers Note For complete syntax and usage information for the commands used in this chapter see the command reference for this release IEEE 802 10 Tunneling Business customers of service providers often have specific requirements for VLAN IDs and the number of VLANs to be supported The VLAN ranges required by different customers in the same
50. 294 ID MTU Size 1500 576 18190 Translational bridge 1 0 0 to 1005 Translational bridge 2 0 0 to 1005 VLAN state active active suspend Remote SPAN disabled enabled disabled Private VLANs none configured 2 to 1001 1006 to 4094 Default VLAN Configuration You can change only the MTU size private VLAN and the remote SPAN configuration state on extended range VLANs all other characteristics must remain at the default state Catalyst 2960 XR Switch VLAN Configuration Guide Cisco IOS Release 15 0 2 EX1 OL 29440 01 Configuring VLANs How to Configure VLANs How to Configure VLANs How to Configure Normal Range VLANs You can set these parameters when you create a new normal range VLAN or modify an existing VLAN in the VLAN database e VLAN ID e VLAN name e VLAN type Ethernet e Fiber Distributed Data Interface FDDI e FDDI network entity title NET TrBRF or TrCRF Token Ring Token Ring Net e VLAN state active or suspended e Maximum transmission unit MTU for the VLAN e Security Association Identifier SAID e Bridge identification number for TTBRF VLANs Ring number for FDDI and TrCRF VLANs e Parent VLAN number for TrCRF VLANs e Spanning Tree Protocol STP type for TrCRF VLANs e VLAN number to use when translating from one VLAN type to another You can cause inconsistency in the VLAN database if you attempt to manually delete the vlan dat file If you want to modify the VLAN
51. 3 switchport trunk encapsulation dotlq config if OL 29440 01 Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 E Configuring IEEE 802 10 and Layer 2 Protocol Tunneling Monitoring Tunneling Status Switch Switch Switch Switch Switch Switch Switch config if config 1if config if config if config config if config if udld enable exit i i switchport mode trunk channel group 1 mode desirable nterface gigabitethernet1 0 4 switchport trunk encapsulation dotlq switchport mode trunk Switch config if udld enable Switch config if channel group 1 mode desirable Switch config if exit Switch config interface port channel 1 Switch config if shutdown Switch config if no shutdown Switch config if exit Related Topics Configuring the SP Edge Switch on page 138 Configuring the Customer Switch on page 141 Monitoring Tunneling Status The following table describes the commands used to monitor tunneling status E Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 Table 15 Commands for Monitoring Tunneling Command Purpose clear l2protocol tunnel counters Clears the protocol counters on Layer 2 protocol tunneling ports show dot1q tunnel Displays IEEE 802 1Q tunnel ports on the switch show dot1q tunnel interface interface id Verifies if a specific inter
52. 7 spanning tree vlan vian range port priority priority value 18 exit 19 interface interface id 20 spanning tree vlan v an range port priority priority value 21 end 22 show running config 23 copy running config startup config Command or Action Purpose configure terminal Enters global configuration mode on Switch A Example Switch configure terminal vtp domain domain name Configures a VTP administrative domain E Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 OL 29440 01 Configuring VLAN Trunks Configuring Trunk Ports for Load Sharing Command or Action Purpose Example Switch config vtp domain workdomain The domain name can be to 32 characters Step 3 vtp mode server Configures Switch A as the VTP server Example Switch config vtp mode server Step 4 end Returns to privileged EXEC mode Example Switch config end Step 5 show vtp status Verifies the VTP configuration on both Switch A and Switch B Example In the display check the VTP Operating Mode and the Switch show vtp status VTP Domain Name fields Step 6 show vlan Verifies that the VLANs exist in the database on Switch A Example Switch show vlan Step 7 configure terminal Enters global configuration mode Example Switch configure terminal Step 8 interface interface id Defines the interface to be configured as a trunk and enters interface configuration mod
53. 9 Layer 2 Protocol Tunneling Overview 129 Layer 2 Protocol Tunneling on Ports 131 Default Layer 2 Protocol Tunneling Configuration 132 How to Configure Tunneling 133 Configuring an IEEE 802 1Q Tunneling Port 133 Configuring Layer 2 Protocol Tunneling 135 Configuring the SP Edge Switch 138 Catalyst 2960 XR Switch VLAN Configuration Guide Cisco IOS Release 15 0 2 EX1 OL 29440 01 Contents Configuring the Customer Switch 141 Configuration Examples for IEEE 802 1Q and Layer 2 Protocol Tunneling 143 Example Configuring an IEEE 802 1Q Tunneling Port 143 Example Configuring Layer 2 Protocol Tunneling 144 Examples Configuring the SP Edge and Customer Switches 145 Monitoring Tunneling Status 146 Where to Go Next 147 Additional References 147 Feature History and Information for Tunneling 148 CHAPTER 8 Configuring Voice VLANs 149 Finding Feature Information 149 Prerequisites for Voice VLANs 149 Restrictions for Voice VLANs 150 Information About Voice VLAN 150 Voice VLANs 150 Cisco IP Phone Voice Traffic 151 Cisco IP Phone Data Traffic 151 Voice VLAN Configuration Guidelines 152 Default Voice VLAN Configuration 153 How to Configure Voice VLAN 153 Configuring Cisco IP Phone Voice Traffic 153 Configuring the Priority of Incoming Data Frames 155 Monitoring Voice VLAN 157 Configuration Examples for Voice VLANs 157 Example Configuring Cisco IP Phone Voice Traffic 157 Example Configuring a Port Connected to an IP Phone Not to Change
54. AN trunk port by removing VLAN 1 from the allowed list When you remove VLAN 1 from a trunk port the interface continues to send and receive management traffic for example Cisco Discovery Protocol CDP Port Aggregation Protocol PAgP Link Aggregation Control Protocol LACP DTP and VTP in VLAN 1 If a trunk port with VLAN 1 disabled is converted to a nontrunk port it is added to the access VLAN If the access VLAN is set to 1 the port will be added to VLAN 1 regardless of the switchport trunk allowed setting The same is true for any VLAN that has been disabled on the port A trunk port can become a member of a VLAN if the VLAN is enabled if VTP knows of the VLAN and if the VLAN is in the allowed list for the port When VTP detects a newly enabled VLAN and the VLAN is in the allowed list for a trunk port the trunk port automatically becomes a member of the enabled VLAN When VTP detects a new VLAN and the VLAN is not in the allowed list for a trunk port the trunk port does not become a member of the new VLAN Load Sharing on Trunk Ports Load sharing divides the bandwidth supplied by parallel trunks connecting switches To avoid loops STP normally blocks all but one parallel link between switches Using load sharing you divide the traffic between the links according to which VLAN the traffic belongs You configure load sharing on trunk ports by using STP port priorities or STP path costs For load sharing using STP port prioritie
55. ANs e Unrecognized Type Length Value TLV support A VTP server or client propagates configuration changes to its other trunks even for TLVs it is not able to parse The unrecognized TLV is saved in NVRAM when the switch is operating in VTP server mode e Version Dependent Transparent Mode In VTP version 1 a VTP transparent switch inspects VTP messages for the domain name and version and forwards a message only if the version and domain name match Although VTP version 2 supports only one domain a VTP version 2 transparent switch forwards a message only when the domain name matches Consistency Checks In VTP version 2 VLAN consistency checks such as VLAN names and values are performed only when you enter new information through the CLI or SNMP Consistency checks are not performed when new information is obtained from a VTP message or when information is read from NVRAM If the MD5 digest on a received VTP message is correct its information is accepted VTP Version 3 VTP version 3 supports these features that are not supported in version 1 or version 2 Enhanced authentication You can configure the authentication as hidden or secret When hidden the secret key from the password string is saved in the VLAN database file but it does not appear in plain text in the configuration Instead the key associated with the password is saved in hexadecimal format in the running configuration You must reenter the password if you enter
56. Ajaj CISCO p 5 A z HA no EA fd l Catalyst 2960 XR Switch VLAN Configuration Guide Cisco IOS Release 15 0 2 EX1 First Published August 08 2013 Americas Headquarters Cisco Systems Inc 170 West Tasman Drive San Jose CA 95134 1706 USA http www cisco com Tel 408 526 4000 800 553 NETS 6387 Fax 408 527 0883 Text Part Number OL 29440 01 THE SPECIFICATIONS AND INFORMATION REGARDING THE PRODUCTS IN THIS MANUAL ARE SUBJECT TO CHANGE WITHOUT NOTICE ALL STATEMENTS INFORMATION AND RECOMMENDATIONS IN THIS MANUAL ARE BELIEVED TO BE ACCURATE BUT ARE PRESENTED WITHOUT WARRANTY OF ANY KIND EXPRESS OR IMPLIED USERS MUST TAKE FULL RESPONSIBILITY FOR THEIR APPLICATION OF ANY PRODUCTS THE SOFTWARE LICENSE AND LIMITED WARRANTY FOR THE ACCOMPANYING PRODUCT ARE SET FORTH IN THE INFORMATION PACKET THAT SHIPPED WITH THE PRODUCT AND ARE INCORPORATED HEREIN BY THIS REFERENCE IF YOU ARE UNABLE TO LOCATE THE SOFTWARE LICENSE OR LIMITED WARRANTY CONTACT YOUR CISCO REPRESENTATIVE FOR A COPY The Cisco implementation of TCP header compression is an adaptation of a program developed by the University of California Berkeley UCB as part of UCB s public domain version of the UNIX operating system All rights reserved Copyright 1981 Regents of the University of California NOTWITHSTANDING ANY OTHER WARRANTY HEREIN ALL DOCUMENT FILES AND SOFTWARE OF THESE SUPPLIERS ARE PROVIDED AS IS WITH ALL FAULTS CISCO AND THE ABOVE
57. Configuring Dynamic Access Ports on VMPS Clients If you are configuring a port on a cluster member switch as a dynamic access port first use the reommand privileged EXEC command to log in to the cluster member switch Before You Begin You must have IP connectivity to the VMPS for dynamic access ports to work You can test for IP connectivity by pinging the IP address of the VMPS and verifying that you get a response L Note To return an interface to its default configuration use the default interface interface id interface configuration command To return an interface to its default switchport mode dynamic auto use the no switchport mode interface configuration command To reset the access mode to the default VLAN for the switch use the no switchport access vlan interface configuration command SUMMARY STEPS 1 configure terminal 2 interface interface id 3 switchport mode access 4 switchport access vlan dynamic 5 end 6 show interfaces interface id switchport 7 copy running config startup config DETAILED STEPS Command or Action Purpose Step 1 configure terminal Enters the global configuration mode Example Switch configure terminal Step 2 interface interface id Specifies the switch port that is connected to the end station and enters interface configuration mode Example Switch config interface gigabitethernet 1 0 1 Step 3 switchport mode access Sets the port to access mode Example Switch conf
58. E a VLANs are often associated with IP subnetworks For example all the end stations in a particular IP subnet belong to the same VLAN Interface VLAN membership on the switch is assigned manually on an Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 OL 29440 01 Configuring VLANs Supported VLANs interface by interface basis When you assign switch interfaces to VLANs by using this method it is known as interface based or static VLAN membership Traffic between VLANs must be routed or fallback bridged The switch can route traffic between VLANs by using switch virtual interfaces SVIs An SVI must be explicitly configured and assigned an IP address to route traffic between VLANs Supported VLANs The switch supports VLANs in VTP client server and transparent modes VLANs are identified by a number from to 4094 VLAN IDs 1002 through 1005 are reserved for Token Ring and FDDI VLANs VTP version 1 and version 2 support only normal range VLANs VLAN IDs to 1005 In these versions the switch must be in VTP transparent mode when you create VLAN IDs from 1006 to 4094 VTP version 3 supports the entire VLAN range VLANs 1 to 4094 Extended range VLANs VLANs 1006 to 4094 are supported only in VTP version 3 You cannot convert from VTP version 3 to VTP version 2 if extended VLANs are configured in the domain The switch or switch stack supports a total of 1005 normal range and extended ra
59. EC command When you save VLAN and VTP information including extended range VLAN configuration information in the startup configuration file and reboot the switch the switch configuration is selected as follows Ifthe VTP mode is transparent in the startup configuration and the VLAN database and the VTP domain name from the VLAN database matches that in the startup configuration file the VLAN database is ignored cleared and the VTP and VLAN configurations in the startup configuration file are used The VLAN database revision number remains unchanged in the VLAN database e If the VTP mode or domain name in the startup configuration does not match the VLAN database the domain name and VTP mode and configuration for the VLAN IDs 1 to 1005 use the VLAN database information e In VTP versions 1 and 2 if VTP mode is server the domain name and VLAN configuration for VLAN IDs 1 to 1005 use the VLAN database information VTP version 3 also supports VLANs 1006 to 4094 Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 OL 29440 01 Configuring VLANs Normal Range VLAN Configuration Guidelines Normal Range VLAN Configuration Guidelines Normal range VLANs are VLANs with IDs from 1 to 1005 VTP 1 and 2 only support normal range VLANs Follow these guidelines when creating and modifying normal range VLANs in your network e Normal range VLANs are identified with a number between 1 and 1001 VLAN
60. FE 802 1Q tagged traffic How to Configure Voice VLAN Configuring Cisco IP Phone Voice Traffic You can configure a port connected to the Cisco IP Phone to send CDP packets to the phone to configure the way in which the phone sends voice traffic The phone can carry voice traffic in IEEE 802 1Q frames for a specified voice VLAN with a Layer 2 CoS value It can use IEEE 802 1p priority tagging to give voice traffic a higher priority and forward all voice traffic through the native access VLAN The Cisco IP Phone can also send untagged voice traffic or use its own configuration to send voice traffic in the access VLAN In all configurations the voice traffic carries a Layer 3 IP precedence value the default is 5 Catalyst 2960 XR Switch VLAN Configuration Guide Cisco IOS Release 15 0 2 EX1 OL 29440 01 Configuring Voice VLANs Configuring Cisco IP Phone Voice Traffic SUMMARY STEPS configure terminal interface interface id mls qos trust cos end eo fF wWN gt Use one of the following switchport voice vlan v an id dot1p none untagged e show interfaces interface id switchport e show running config interface interface id 7 copy running config startup config DETAILED STEPS Command or Action Purpose Step 1 configure terminal Enters the global configuration mode Example Switch configure terminal Step 2 interface interface id Specifies the interface connected to the phone and enters in
61. Frame Priority 158 Where to Go Next 158 Additional References 159 Feature History and Information for Voice VLAN 160 Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 OL 29440 01 a Contents Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 OL 29440 01 Preface This guide describes configuration information and examples for VLANs on the switch e Document Conventions page xi e Related Documentation page xiii e Obtaining Documentation and Submitting a Service Request page xiii Document Conventions This document uses the following conventions Convention or Ctrl Description Both the symbol and Ctrl represent the Control Ctrl key on a keyboard For example the key combination D or Ctrl D means that you hold down the Control key while you press the D key Keys are indicated in capital letters but are not case sensitive bold font Commands and keywords and user entered text appear in bold font Italic font Document titles new or emphasized terms and arguments for which you supply values are in italic font Courier font Terminal sessions and information the system displays appear in courier font Bold Courier font Bold Courier font indicates text that the user must enter x Elements in square brackets are optional An ellipsis three consecutive nonbolded periods without spaces after a syntax
62. Gigabit Ethernet ports to support frames larger than 1500 bytes by using the system mtu jumbo global configuration command The system MTU and system jumbo MTU values do not include the IEEE 802 1Q header Because the IEEE 802 1Q tunneling feature increases the frame size by 4 bytes when the metro tag is added you must configure all switches in the service provider network to be able to process maximum frames by adding 4 bytes to the system MTU and system jumbo MTU sizes For example the switch supports a maximum frame size of 1496 bytes with one of these configurations The switch has a system jumbo MTU value of 1500 bytes and the switchport mode dot1q tunnel interface configuration command is configured on a 10 Gigabit or Gigabit Ethernet switch port The switch member has a system MTU value of 1500 bytes and the switchport mode dot1q tunnel interface configuration command is configured on a Fast Ethernet port of the member OL 29440 01 Configuring IEEE 802 10 and Layer 2 Protocol Tunneling Default IEEE 802 10 Tunneling Configuration i Default IEEE 802 10 Tunneling Configuration By default IEEE 802 1Q tunneling is disabled because the default switchport mode is dynamic auto Tagging of IEEE 802 1Q native VLAN packets on all IEEE 802 1Q trunk ports is also disabled Layer 2 Protocol Tunneling Overview X Customers at different sites connected across a service provider network need to use various Layer 2 protocols
63. LAN The Power over Ethernet PoE switches are capable of automatically providing power to Cisco pre standard and IEEE 802 3af compliant powered devices if they are not being powered by an AC power source e Before you enable voice VLAN we recommend that you enable QoS on the switch by entering the mls qos global configuration command and configure the port trust state to trust by entering the mls qos trust cos interface configuration command If you use the auto QoS feature these settings are automatically configured e You must enable CDP on the switch port connected to the Cisco IP Phone to send the configuration to the phone CDP is globally enabled by default on all switch interfaces e The Port Fast feature is automatically enabled when voice VLAN is configured When you disable voice VLAN the Port Fast feature is not automatically disabled e If the Cisco IP Phone and a device attached to the phone are in the same VLAN they must be in the same IP subnet These conditions indicate that they are in the same VLAN They both use IEEE 802 1p or untagged frames The Cisco IP Phone uses IEEE 802 1p frames and the device uses untagged frames The Cisco IP Phone uses untagged frames and the device uses IEEE 802 1p frames The Cisco IP Phone uses IEEE 802 1Q frames and the voice VLAN is the same as the access VLAN The Cisco IP Phone and a device attached to the phone cannot communicate if they are in the same VLA
64. LANs Private VLAN Interaction with Other Features A feature of private VLANs across multiple switches is that traffic from an isolated port in switch A does not reach an isolated port on Switch B Figure 7 Private VLANs Across Switches VLAN 100 ie VLAN 100 ON v 201 VLAN 202 Carries VLAN 100 ee A _ 201 and 202 traffic a ee 110084 VLAN 100 Primary VLAN VLAN 201 Secondary isolated VLAN VLAN 202 Secondary community VLAN Because VTP does not support private VLANs you must manually configure private VLANs on all switches in the Layer 2 network If you do not configure the primary and secondary VLAN association in some switches in the network the Layer 2 databases in these switches are not merged This can result in unnecessary flooding of private VLAN traffic on those switches Private VLAN Interaction with Other Features Private VLANs and Unicast Broadcast and Multicast Traffic In regular VLANs devices in the same VLAN can communicate with each other at the Layer 2 level but devices connected to interfaces in different VLANs must communicate at the Layer 3 level In private VLANs the promiscuous ports are members of the primary VLAN while the host ports belong to secondary VLANs Because the secondary VLAN is associated to the primary VLAN members of the these VLANs can communicate with each other at the Layer 2 level In aregular VLAN broadcasts are forwarded to all po
65. LED STEPS Command or Action Purpose Step 1 configure terminal Enters the global configuration mode Example Switch configure terminal Step 2 vtp mode transparent Configures the switch for VTP transparent mode disabling VTP Note This step is not required for VTP version Example 3 Switch config vtp mode transparent Step 3 vlan vlan id Enters an extended range VLAN ID and enters VLAN configuration mode The range is 1006 to 4094 Example Note To delete an extended range VLAN use the no vlan vlan id Switch config vlan 2000 global configuration command Switch config vlan Step 4 mtu mtu size Modifies the VLAN by changing the MTU size Example Switch config vlan mtu 1024 Step 5 remote span Optional Configures the VLAN as the RSPAN VLAN Example Switch config vlan remote span Step 6 end Returns to privileged EXEC mode Example Switch config end Step 7 show vlan id vian id Verifies that the VLAN has been created Example Switch show vlan id 2000 Step 8 copy running config startup config Saves your entries in the switch startup configuration file To save an extended range VLAN configuration you need to save the Example VTP transparent mode configuration and the extended range VLAN configuration in the switch startup configuration file Otherwise if the Switch copy running config Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Relea
66. N and subnet but use different frame types because traffic in the same subnet is not routed routing would eliminate the frame type difference Catalyst 2960 XR Switch VLAN Configuration Guide Cisco IOS Release 15 0 2 EX1 OL 29440 01 Configuring Voice VLANs Default Voice VLAN Configuration i e Voice VLAN ports can also be these port types e Dynamic access port e IEEE 802 1x authenticated port Note If you enable IEEE 802 1x on an access port on which a voice VLAN is configured and to which a Cisco IP Phone is connected the phone loses connectivity to the switch for up to 30 seconds Protected port e A source or destination port for a SPAN or RSPAN session e Secure port N Note When you enable port security on an interface that is also configured with a voice VLAN you must set the maximum allowed secure addresses on the port to two plus the maximum number of secure addresses allowed on the access VLAN When the port is connected to a Cisco IP Phone the phone requires up to two MAC addresses The phone address is learned on the voice VLAN and might also be learned on the access VLAN Connecting a PC to the phone requires additional MAC addresses Default Voice VLAN Configuration The voice VLAN feature is disabled by default When the voice VLAN feature is enabled all untagged traffic is sent according to the default CoS priority of the port The CoS value is not trusted for IEEE 802 1p or IE
67. Private VLAN Domains The private VLAN feature addresses two problems that service providers face when using VLANs e The switch supports up to 1005 active VLANs If a service provider assigns one VLAN per customer this limits the numbers of customers the service provider can support To enable IP routing each VLAN is assigned a subnet address space or a block of addresses which can result in wasting the unused IP addresses and cause IP address management problems Using private VLANs addresses the scalability problem and provides IP address management benefits for service providers and Layer 2 security for customers Private VLANs partition a regular VLAN domain into subdomains A subdomain is represented by a pair of VLANs a primary VLAN and a secondary VLAN A Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 OL 29440 01 Configuring Private VLANs Secondary VLANs private VLAN can have multiple VLAN pairs one pair for each subdomain All VLAN pairs in a private VLAN share the same primary VLAN The secondary VLAN ID differentiates one subdomain from another Figure 6 Private VLAN Domain E E E Primary E VLAN Private VLAN Subdomain k _ Subdomain H f TA 1 A f Secondary Secondary Qo wan Db isolta VLAN ae AN 110083 Related Topics Configuring and Associating VLANs in a Private VLAN on page 93 Example Configuring a Prima
68. R Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 E Configuring IEEE 802 10 and Layer 2 Protocol Tunneling Catalyst 2960 XR Switch VLAN Configuration Guide Cisco IOS Release 15 0 2 EX1 IEEE 802 10 Tunneling Configuration Guidelines e Ensure that the native VLAN ID on the edge switch trunk port is not within the customer VLAN range For example if the trunk port carries traffic of VLANs 100 to 200 assign the native VLAN a number outside that range Figure 11 Potential Problems with IEEE 802 10 Tunneling and Native VLANs Switch D Tag not added Tag eis math BENE aan RNA Native VLAN 40 eT Service T eo provider De Tunnel port 4 a Switch B l VLANs 5 50 Switch CW any 40 Packet tagged for VLAN 30 Q Native Q K VLAN 40 eed i gt lt Tunnel port Tunnel port NS Switch A Pes Access VLAN 40 Access VLAN 30 NY Customer X 2 7 802 10 A trunk port Bde VLANs 30 40 _ Ss Switch E Native VLAN 40 Sa ee Customer Y Trunk z c Asymmetric link Correct path for traffic gt Incorrect path for traffic due to misconfiguration of native VLAN by sending port on Switch B a Q 802 1 Q trunk ports a System MTU The default system MTU for traffic on the switch is 1500 bytes You can configure Fast Ethernet ports on the switch members in the mixed hardware switch stack to support frames larger than 1500 bytes by using the system mtu global configuration command You can configure 10 Gigabit and
69. Switch VLAN Configuration Guide Cisco IOS Release 15 0 2 EX1 OL 29440 01 Configuring VTP VTP Configuration Guidelines Related Topics Configuring a VTP Version 3 Password on page 26 Example Configuring a Hidden Password on page 35 VTP Version Follow these guidelines when deciding which VTP version to implement All switches in a VTP domain must have the same domain name but they do not need to run the same VTP version e A VTP version 2 capable switch can operate in the same VTP domain as a switch running VTP version 1 if version 2 is disabled on the version 2 capable switch version 2 is disabled by default e Ifa switch running VTP version 1 but capable of running VTP version 2 receives VTP version 3 advertisements it automatically moves to VTP version 2 e If a switch running VTP version 3 is connected to a switch running VTP version 1 the VTP version 1 switch moves to VTP version 2 and the VTP version 3 switch sends scaled down versions of the VTP packets so that the VTP version 2 switch can update its database e A switch running VTP version 3 cannot move to version or 2 if it has extended VLANs Do not enable VTP version 2 on a switch unless all of the switches in the same VTP domain are version 2 capable When you enable version 2 on a switch all of the version 2 capable switches in the domain enable version 2 If there is a version 1 only switch it does not exchange VTP information with switches
70. This feature was introduced Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 OL 29440 01 Configuring VLANs A Feature History and Information for VLAN Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 OL 29440 01 CHAPTER Configuring VLAN Trunks e Finding Feature Information page 61 e Prerequisites for VLAN Trunks page 61 e Restrictions for VLAN Trunks page 62 Information About VLAN Trunks page 62 e How to Configure VLAN Trunks page 67 e Configuration Examples for VLAN Trunking page 80 e Where to Go Next page 81 Additional References page 81 e Feature History and Information for VLAN Trunks page 82 Finding Feature Information Your software release may not support all the features documented in this module For the latest feature information and caveats see the release notes for your platform and software release Use Cisco Feature Navigator to find information about platform support and Cisco software image support To access Cisco Feature Navigator go to http www cisco com go cfn An account on Cisco com is not required Prerequisites for VLAN Trunks The IEEE 802 1Q trunks impose these limitations on the trunking strategy for a network In a network of Cisco switches connected through IEEE 802 1Q trunks the switches maintain one spanning tree instance for each VLAN allowed on the trunks Non Cisco devices might support
71. U guard on promiscuous ports e If you delete a VLAN used in the private VLAN configuration the private VLAN ports associated with the VLAN become inactive e Private VLAN ports can be on different network devices if the devices are trunk connected and the primary and secondary VLANs have not been removed from the trunk Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 OL 29440 01 Configuring Private VLANs A Restrictions for Private VLANs Restrictions for Private VLANs The following are restrictions for configuring private VLANs e Private VLANs are only supported on switches running the IP Lite image Limitations with Other Features When configuring private VLANs remember these limitations with other features X Note In some cases the configuration is accepted with no error messages but the commands have no effect e Do not configure fallback bridging on switches with private VLANs e When IGMP snooping is enabled on the switch the default the switch or switch stack supports no more than 20 private VLAN domains e Do not configure a remote SPAN RSPAN VLAN as a private VLAN primary or secondary VLAN e Do not configure private VLAN ports on interfaces configured for these other features e Dynamic access port VLAN membership e Dynamic Trunking Protocol DTP Port Aggregation Protocol PAgP Link Aggregation Control Protocol LACP e Multicast VLAN Registra
72. VIs and other configured features affects the use of the switch hardware If you try to create an extended range VLAN and there are not enough hardware resources available an error message is generated and the extended range VLAN is rejected e In a switch stack the whole stack uses the same running configuration and saved configuration and extended range VLAN information is shared across the stack Related Topics Creating an Extended Range VLAN on page 52 Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 OL 29440 01 Configuring VLANs Default Ethernet VLAN Configuration Example Creating an Extended Range VLAN on page 57 Default Ethernet VLAN Configuration The following table displays the default configuration for Ethernet VLANs XY Note The switch supports Ethernet interfaces exclusively Because FDDI and Token Ring VLANs are not locally supported you only configure FDDI and Token Ring media specific characteristics for VTP global advertisements to other switches Table 8 Ethernet VLAN Defaults and Range Parameter Default Range VLAN ID 1 1 to 4094 Note Extended range VLANs VLAN IDs 1006 to 4094 are only saved in the VLAN database in VTP version 3 VLAN name VLANKxxxx where xxxx represents No range four numeric digits including leading zeros equal to the VLAN ID number IEEE 802 10 SAID 100001 100000 plus the VLAN 1 to 4294967
73. VLAN This example shows how to remove VLAN 2 from the allowed VLAN list on a port Switch config interface gigabitethernet0 1 Switch config if switchport trunk allowed vlan remove 2 Switch config if end Related Topics Defining the Allowed VLANs on a Trunk Where to Go Next After configuring VLAN trunks you can configure the following e VTP e VLANs e Private VLANs e VLAN Membership Policy Server VMPS Tunneling e Voice VLANs Additional References Related Documents Related Topic Document Title For complete syntax and usage information for the Catalyst 2960 XR Switch VLAN Management commands used in this chapter Command Reference Standards and RFCs Standard RFC Title Catalyst 2960 XR Switch VLAN Configuration Guide Cisco IOS Release 15 0 2 EX1 OL 29440 01 Configuring VLAN Trunks Feature History and Information for VLAN Trunks MIBs MIB MIBs Link All supported MIBs for this release To locate and download MIBs for selected platforms Cisco IOS releases and feature sets use Cisco MIB Locator found at the following URL http www cisco com go mibs Technical Assistance Description Link The Cisco Support website provides extensive online resources including documentation and tools for troubleshooting and resolving technical issues with Cisco products and technologies To receive security and technical information abo
74. VLAN0004 is a default VLAN name for VLAN 4 Switch config vlan name test20 Step 4 mtu mtu size Optional Changes the MTU size or other VLAN characteristic Example Switch config vlan mtu 256 Step 5 remote span Optional Configures the VLAN as the RSPAN VLAN for a remote SPAN session Example Note To return the VLAN name to the default settings use the no Switch config vlan xsemote span name no mtu or no remote span commands Step 6 end Returns to privileged EXEC mode Example Switch config end Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 OL 29440 01 Configuring VLANs How to Configure Normal Range VLANs i Command or Action Purpose Step 7 show vlan name vian name id vlan id Verifies your entries Example Switch show vlan name test20 id 20 Related Topics Normal Range VLAN Configuration Guidelines on page 44 Example Creating a VLAN Name on page 57 Deleting a VLAN When you delete a VLAN from a switch that is in VTP server mode the VLAN is removed from the VLAN database for all switches in the VTP domain When you delete a VLAN from a switch that is in VTP transparent mode the VLAN is deleted only on that specific switch or a switch stack You cannot delete the default VLANs for the different media types Ethernet VLAN 1 and FDDI or Token Ring VLANs 1002 to 1005 gt Caution When you delete a VLAN any
75. a working VTP domain without any primary servers Primary server status is lost if the device reloads or domain parameters change even when a password is configured on the switch The option to turn VTP on or off on a per trunk per port basis You can enable or disable VTP per port by entering the no vtp interface configuration command When you disable VTP on trunking ports all VTP instances for that port are disabled You cannot set VTP to off for the MST database and on for the VLAN database on the same port When you globally set VTP mode to off it applies to all the trunking ports in the system However you can specify on or off on a per VTP instance basis For example you can configure the switch as a VTP server for the VLAN database but with VTP off for the MST database VTP pruning increases network available bandwidth by restricting flooded traffic to those trunk links that the traffic must use to reach the destination devices Without VTP pruning a switch floods broadcast multicast and unknown unicast traffic across all trunk links within a VTP domain even though receiving switches might discard them VTP pruning is disabled by default VTP pruning blocks unneeded flooded traffic to VLANs on trunk ports that are included in the pruning eligible list Only VLANs included in the pruning eligible list can be pruned By default VLANs 2 through 1001 are pruning eligible switch trunk ports If the VLANs are configured as pruning ineli
76. age 111 Example VMPS Configuration on page 117 Dynamic Access Port VLAN Membership A dynamic access port can belong to only one VLAN with an ID from 1 to 4094 When the link comes up the switch does not forward traffic to or from this port until the VMPS provides the VLAN assignment The VMPS receives the source MAC address from the first packet of a new host connected to the dynamic access port and attempts to match the MAC address to a VLAN in the VMPS database If there is a match the VMPS sends the VLAN number for that port If the client switch was not previously configured it uses the domain name from the first VTP packet it receives on its trunk port from the VMPS If the client switch was previously configured it includes its domain name in the query packet to the VMPS to obtain its VLAN number The VMPS verifies that the domain name in the packet matches its own domain name before accepting the request and responds to the client with the assigned VLAN number for the client If there is no match the VMPS either denies the request or shuts down the port depending on the VMPS secure mode setting Multiple hosts MAC addresses can be active on a dynamic access port if they are all in the same VLAN however the VMPS shuts down a dynamic access port if more than 20 hosts are active on the port If the link goes down on a dynamic access port the port returns to an isolated state and does not belong to a VLAN Any hosts that come online
77. agged Configures the phone to send untagged voice traffic Note Before configuring the switch port to detect and recognize a Cisco IP phone confirm that the phone is powered by PoE The configuration fails when power is provided by an AC source Step 5 end Returns to privileged EXEC mode Example Switch config if end Step 6 Use one of the following Verifies your voice VLAN entries or your QoS and voice VLAN entries e show interfaces interface id switchport e show running config interface interface id Example Switch show interfaces gigabitethernet1 0 1 switchport or Switch show running config interface gigabitethernet1 0 1 Step 7 copy running config startup config Optional Saves your entries in the configuration file Example Switch copy running config startup config Related Topics Cisco IP Phone Voice Traffic on page 151 Example Configuring Cisco IP Phone Voice Traffic on page 157 Configuring the Priority of Incoming Data Frames You can connect a PC or other data device to a Cisco IP Phone port To process tagged data traffic in IEEE 802 1Q or IEEE 802 1p frames you can configure the switch to send CDP packets to instruct the phone how Catalyst 2960 XR Switch VLAN Configuration Guide Cisco IOS Release 15 0 2 EX1 OL 29440 01 Configuring Voice VLANs A Configuring the Priority of Incoming Data Frames to send data packets from the device attached to the access port
78. ame as described in the previous paragraph except that the packets are not double tagged in the service provider network The single tag is the customer specific access VLAN tag In switch stacks Layer 2 protocol tunneling configuration is distributed among all stack members Each stack member that receives an ingress packet on a local port encapsulates or decapsulates the packet and forwards it to the appropriate destination port On a single switch ingress Layer 2 protocol tunneled traffic is sent across all local ports in the same VLAN on which Layer 2 protocol tunneling is enabled In a stack packets received by a Layer 2 protocol tunneled port are distributed to all ports in the stack that are configured for Layer 2 protocol tunneling and are in the same VLAN All Layer 2 protocol tunneling configuration is handled by the stack master and distributed to all stack members Related Topics Configuring Layer 2 Protocol Tunneling on page 135 Example Configuring Layer 2 Protocol Tunneling on page 144 Default Layer 2 Protocol Tunneling Configuration Catalyst 2960 XR Switch VLAN Configuration Guide Cisco IOS Release 15 0 2 EX1 The following table shows the default Layer 2 protocol tunneling configuration Table 14 Default Layer 2 Ethernet Interface VLAN Configuration Feature Default Setting Layer 2 protocol tunneling Disabled Shutdown threshold None set Drop threshold None set CoS Value If a CoS value is configured
79. an server mode VTP server mode requires a domain name If the switch has a trunk connection to a VTP domain the switch learns the domain name from the VTP server in the domain You should configure the VTP domain before configuring other VTP parameters Note Step 3 vtp mode client server transparent Configures the switch for VTP mode client server transparent or off off vlan mst unknown e ylan The VLAN database is the default if none are configured Example e mst The multiple spanning tree MST database Switch config vtp mode server unknown An unknown database type Note To return a switch in another mode to VTP server mode use the no vtp mode global configuration command Step 4 vtp password password Optional Sets the password for the VTP domain The password can be 8 to 64 characters If you configure a VTP password the VTP domain does not Example function properly if you do not assign the same password to each switch in the domain Switch config vtp password R mypassword Note To return the switch to a no password state use the no vtp password global configuration command Step 5 end Returns to privileged EXEC mode Example Switch config end Step 6 show vtp status Verifies your entries in the VTP Operating Mode and the VTP Domain Name Example Switch show vtp status fields of the display OL 29440 01 Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release
80. an_list to clear the mapping between secondary VLANs and the primary VLAN Step 4 end Returns to privileged EXEC mode Example Switch config if end Step 5 show interface private vlan mapping Verifies the configuration E Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 Example Switch show interfaces private vlan OL 29440 01 Configuring Private VLANs Monitoring Private VLANs i Command or Action Purpose mapping Step 6 copy running config startup config Saves your entries in the switch startup configuration file Example Switch copy running config startup config Related Topics Example Mapping Secondary VLANs to a Primary VLAN Interface on page 103 Monitoring Private VLANs The following table displays the commands used to monitor private VLANs Table 12 Private VLAN Monitoring Commands Command Purpose show interfaces status Displays the status of interfaces including the VLANs to which they belongs show vlan private vlan type Displays the private VLAN information for the switch or switch stack show interface switchport Displays private VLAN configuration on interfaces show interface private vlan mapping Displays information about the private VLAN mapping for VLAN SVIs Catalyst 2960 XR Switch VLAN Configuration Guide Cisco IOS Release 15 0 2 EX1 OL 29440 01 Configuring Private VLANs Conf
81. ar expression DETAILED STEPS Command or Action Purpose Step 1 show more command begin include exclude Searches and filters the output E Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 regular expression OL 29440 01 Using the Command Line Interface Accessing the CLI through a Console Connection or through Telnet i Command or Action Purpose Expressions are case sensitive For example if you enter exclude output the lines that contain output are not displayed but the lines that contain output appear Example Switch show interfaces include protocol Vlanl is up line protocol is up Vlanl0 is up line protocol is down GigabitEthernet1 0 1 is up line protocol is down GigabitEthernet1 0 2 is up line protocol is up Accessing the CLI through a Console Connection or through Telnet Before you can access the CLI you must connect a terminal or a PC to the switch console or connect a PC to the Ethernet management port and then power on the switch as described in the hardware installation guide that shipped with your switch If your switch is already configured you can access the CLI through a local console connection or through a remote Telnet session but your switch must first be configured for this type of access You can use one of these methods to establish a connection with the switch e Connect the switch console port to a management station o
82. ase 15 0 2 EX1 m Configuring IEEE 802 10 and Layer 2 Protocol Tunneling Configuring the SP Edge Switch Command or Action Purpose startup config Related Topics Layer 2 Protocol Tunneling on Ports on page 131 Layer 2 Protocol Tunneling on page 122 Layer 2 Tunneling for EtherChannels on page 124 Example Configuring Layer 2 Protocol Tunneling on page 144 Configuring the SP Edge Switch Before You Begin For EtherChannels you need to configure both the SP service provider edge switches and the customer switches for Layer 2 protocol tunneling SUMMARY STEPS configure terminal interface interface id switchport mode dot1q tunnel 12protocol tunnel point to point pagp lacp udld 12protocol tunnel shutdown threshold point to point pagp lacp udld value 12protocol tunnel drop threshold point to point pagp lacp udld value no cdp enable spanning tree bpdu filter enable sco NO oO FWD gt exit _ errdisable recovery cause l2ptguard _ 2protocol tunnel cos value N end oo Show 12protocol _ copy running config startup config Catalyst 2960 XR Switch VLAN Configuration Guide Cisco IOS Release 15 0 2 EX1 OL 29440 01 Configuring IEEE 802 10 and Layer 2 Protocol Tunneling Configuring the SP Edge Switch DETAILED STEPS Command or Action Purpose Step 1 configure terminal Enters the global con
83. bal configuration command when the new master is elected it sends a takeover message with the new master MAC address as the primary server e If persistent MAC address is configured the new master waits for the configured stack mac persistent timer value If the previous master switch does not rejoin the stack during this time then the new master issues the takeover message VTP Configuration Guidelines Configuration Requirements When you configure VTP you must configure a trunk port so that the switch can send and receive VTP advertisements to and from other switches in the domain If you are configuring VTP on a cluster member switch to a VLAN use the reommand privileged EXEC command to log in to the member switch For more information about the command see the command reference for this release In VTP versions 1 and 2 when you configure extended range VLANs on the switch the switch must be in VTP transparent mode VTP version 3 also supports creating extended range VLANs in client or server mode VTP versions 1 and 2 do not support private VLANs VTP version 3 does support private VLANs If you configure private VLANs the switch must be in VTP transparent mode When private VLANs are configured on the switch do not change the VTP mode from transparent to client or server mode VTP Settings The VTP information is saved in the VTP VLAN database When VTP mode is transparent the VTP domain name and mode are also saved in the s
84. ber of spanning tree instances are on the switch spanning tree is disabled on any newly created VLANs If the number of VLANs on the switch exceeds the maximum number of spanning tree instances we recommend that you configure the IEEE 802 1s Multiple STP MSTP on your switch to map multiple VLANs to a single spanning tree instance e Each routed port on the switch creates an internal VLAN for its use These internal VLANs use extended range VLAN numbers and the internal VLAN ID cannot be used for an extended range VLAN If you try to create an extended range VLAN with a VLAN ID that is already allocated as an internal VLAN an error message is generated and the command is rejected e Because internal VLAN IDs are in the lower part of the extended range we recommend that you create extended range VLANs beginning from the highest number 4094 and moving to the lowest 1006 to reduce the possibility of using an internal VLAN ID e Before configuring extended range VLANs enter the show vlan internal usage privileged EXEC command to see which VLANs have been allocated as internal VLANs If necessary you can shut down the routed port assigned to the internal VLAN which frees up the internal VLAN and then create the extended range VLAN and re enable the port which then uses another VLAN as its internal VLAN e Although the switch or switch stack supports a total of 1005 normal range and extended range VLANs the number of routed ports S
85. bership 109 114 116 described 109 reconfirming 114 troubleshooting 116 entering server address 110 reconfirmation interval changing 114 reconfirming membership 113 retry count changing 115 VMPS client configuration 110 default 110 VMPS Configuration Example command 117 voice VLAN 152 153 155 configuration guidelines 152 configuring IP phones for data traffic 155 override CoS of incoming frame 155 voice VLAN continued configuring ports for voice traffic in 153 802 1p priority tagged frames 153 voice VLANs 150 VTP 14 20 22 configuration requirements 20 version 22 VTP advertisements 16 VTP domain 14 32 VTP mode 24 VTP modes 15 VTP password 26 VTP primary 27 VTP pruning 18 VTP settings 20 VTP version 28 VTP version 2 17 VTP version 3 17 OL 29440 01 Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 a Index Catalyst 2960 XR Switch VLAN Configuration Guide Cisco IOS Release 15 0 2 EX1 OL 29440 01
86. cannot convert from VTP version 3 to VTP version 2 if extended VLANs are configured in the domain A VTP domain also called a VLAN management domain consists of one switch or several interconnected switches or switch stacks under the same administrative responsibility sharing the same VTP domain name A switch can be in only one VTP domain You make global VLAN configuration changes for the domain By default the switch is in the VTP no management domain state until it receives an advertisement for a domain over a trunk link a link that carries the traffic of multiple VLANs or until you configure a domain name Until the management domain name is specified or learned you cannot create or modify VLANs on a VTP server and VLAN information is not propagated over the network If the switch receives a VTP advertisement over a trunk link it inherits the management domain name and the VTP configuration revision number The switch then ignores advertisements with a different domain name or an earlier configuration revision number B Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 OL 29440 01 Configuring VTP VTP Modes i Note VTP Modes Before adding a VTP client switch to a VTP domain always verify that its VTP configuration revision number is lower than the configuration revision number of the other switches in the VTP domain Switches in a VTP domain always use the VLAN configuration of
87. ce interface id show interfaces interface id switchport E Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 OL 29440 01 Configuring VLANs How to Configure Normal Range VLANs i DETAILED STEPS Command or Action Purpose Step 1 configure terminal Enters the global configuration mode Example Switch configure terminal Step 2 interface interface id Enters the interface to be added to the VLAN Example Switch config interface gigabitethernet2 0 1 Step 3 switchport mode access Defines the VLAN membership mode for the port Layer 2 access port Example Switch config if switchport mode access Step 4 switchport access vlan vian id Assigns the port toa VLAN Valid VLAN IDs are 1 to 4094 Example Note To return an interface to its default configuration use the default interface interface id interface Switch config if switchport access vlan 2 configuration command Step 5 end Returns to privileged EXEC mode Example Switch config end Step 6 show running config interface interface id Verifies the VLAN membership mode of the interface Example Switch copy running config startup config Step 7 show interfaces interface id switchport Verifies your entries in the Administrative Mode and the Access Mode VLAN fields of the display Example Switch show interfaces gigabitethernet2 0 1 Related Topics Example Configuring a Port
88. ceive these advertisements and update their VTP and VLAN configurations as necessary Because trunk ports send and receive VTP advertisements you must ensure that at least one trunk port is configured on the switch stack and that this trunk port is connected to the trunk port of another switch Otherwise the switch cannot receive any VTP advertisements VTP advertisements distribute this global domain information e VTP domain name VTP configuration revision number e Update identity and update timestamp e MDS digest VLAN configuration including maximum transmission unit MTU size for each VLAN Catalyst 2960 XR Switch VLAN Configuration Guide Cisco IOS Release 15 0 2 EX1 OL 29440 01 Configuring VTP VTP Version 2 i e Frame format VTP advertisements distribute this VLAN information for each configured VLAN e VLAN IDs including IEEE 802 1Q e VLAN name e VLAN type e VLAN state e Additional VLAN configuration information specific to the VLAN type In VTP version 3 VTP advertisements also include the primary server ID an instance number and a start index VTP Version 2 If you use VTP in your network you must decide which version of VTP to use By default VTP operates in version 1 VTP version 2 supports these features that are not supported in version 1 Token Ring support VTP version 2 supports Token Ring Bridge Relay Function TrBRF and Token Ring Concentrator Relay Function TrCRF VL
89. config Note To return to the default allowed VLAN list of all VLANs use the no switchport trunk allowed vlan interface configuration command E Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 OL 29440 01 Configuring VLAN Trunks Changing the Pruning Eligible List Configuring an Ethernet Interface as a Trunk Port The pruning eligible list applies only to trunk ports Each trunk port has its own eligibility list VTP pruning must be enabled for this procedure to take effect switchport trunk pruning vlan add except none remove vlan list vlan vlan SUMMARY STEPS 1 configure terminal 2 interface interface id 3 4 end 5 show interfaces interface id switchport 6 copy running config startup config DETAILED STEPS Command or Action Purpose Step 1 Step 2 Step 3 configure terminal Example Switch configure terminal interface interface id Example Switch config interface gigabitethernet2 0 1 switchport trunk pruning vlan add except none remove vlan list vlan vlan Enters the global configuration mode Selects the trunk port for which VLANs should be pruned and enters interface configuration mode Configures the list of VLANs allowed to be pruned from the trunk For explanations about using the add except none and remove keywords see the command reference for this release Separate non
90. config startup config Related Topics Examples Configuring the SP Edge and Customer Switches on page 145 Configuring the Customer Switch Before You Begin For EtherChannels you need to configure both the SP edge switches and the customer switches for Layer 2 protocol tunneling SUMMARY STEPS configure terminal interface interface id switchport mode trunk udld port channel group channel group number mode desirable exit interface port channel port channel number shutdown sco NO OF WD no shutdown 10 end 11 show I2protocol 12 copy running config startup config Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 OL 29440 01 Configuring IEEE 802 10 and Layer 2 Protocol Tunneling A Configuring the Customer Switch DETAILED STEPS Command or Action Purpose Step 1 configure terminal Enters the global configuration mode Example Switch configure terminal Step 2 interface interface id Specifies the interface connected to the phone and enters interface configuration mode Example Switch config interface gigabitethernet1 0 1 Step 3 switchport mode trunk Enables trunking on the interface Example Switch config if switchport mode trunk Step 4 udld port Enables UDLD in normal mode on the interface Example Switch config if udld port Step 5 channel group channel group number mode desirable Assigns the interface to a channel group and spec
91. configuration follow the procedures in this section Creating or Modifying an Ethernet VLAN Each Ethernet VLAN in the VLAN database has a unique 4 digit ID that can be a number from to 1001 VLAN IDs 1002 to 1005 are reserved for Token Ring and FDDI VLANs To create a normal range VLAN to be added to the VLAN database assign a number and name to the VLAN X Note With VTP version 1 and 2 if the switch is in VTP transparent mode you can assign VLAN IDs greater than 1006 but they are not added to the VLAN database Catalyst 2960 XR Switch VLAN Configuration Guide Cisco IOS Release 15 0 2 EX1 OL 29440 01 Configuring VLANs A How to Configure Normal Range VLANs SUMMARY STEPS 1 configure terminal 2 vlan vlan id 3 name vlan name 4 mtu mtu size 5 remote span 6 end 7 show vlan name vlan name id vlan id DETAILED STEPS Command or Action Purpose Step 1 configure terminal Enters the global configuration mode Example Switch configure terminal Step 2 vlan vlan id Enters a VLAN ID and enters VLAN configuration mode Enter a new VLAN ID to create a VLAN or enter an existing VLAN ID to Example modify that VLAN Switch config vlan 20 Note The available VLAN ID range for this command is 1 to 4094 Step 3 name vlan name Optional Enters a name for the VLAN If no name is entered for the VLAN the default is to append the vlan id value with leading Example zeros to the word VLAN For example
92. cted through the service provider network If the network does not tunnel PDUs switches on the far ends of the network cannot properly run STP CDP and VTP For example STP for a VLAN on OL 29440 01 Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 m Configuring IEEE 802 10 and Layer 2 Protocol Tunneling Layer 2 Protocol Tunneling Overview a switch in Customer X Site 1 will build a spanning tree on the switches at that site without considering convergence parameters based on Customer X s switch in Site 2 This could result in the topology shown in the Layer 2 Network Topology without Proper Convergence figure Figure 12 Layer 2 Protocol Tunneling Customer X Site 1 VLANs 1d 100 a i _ Customer X Ste2 VLANs 1d 100 Service iii o provider a fs ake VLAN 30 VLAN 30 E Tunk Trunk J S Switch A Switch C witch B Switch D sh Trunk Trunk g ports ports _ j SS lt VLAN 40 vanao _ ACEA ees Trunk Cust Y Site 1 anii VLANs 1d saa Asymmetric link Customer Y Site 2 VLANs 1d 200 Figure 13 Layer 2 Network Topology Without Proper Convergence Customer X virtual network VLANs 1 to 100 X Z Fi f j gt i a 101821 In an SP network you can use Layer 2 protocol tunneling to enhance the creation of EtherChannels by emulating a point to point network topology When you enable protocol tunneling PAgP or LACP on th
93. ctions for voice VLANs Do not configure voice VLAN on private VLAN ports e You cannot configure static secure MAC addresses in the voice VLAN Information About Voice VLAN Voice VLANs The voice VLAN feature enables access ports to carry IP voice traffic from an IP phone When the switch is connected to a Cisco 7960 IP Phone the phone sends voice traffic with Layer 3 IP precedence and Layer 2 class of service CoS values which are both set to 5 by default Because the sound quality of an IP phone call can deteriorate if the data is unevenly sent the switch supports quality of service QoS based on IEEE 802 1p CoS QoS uses classification and scheduling to send network traffic from the switch in a predictable manner The Cisco 7960 IP Phone is a configurable device and you can configure it to forward traffic with an IEEE 802 1p priority You can configure the switch to trust or override the traffic priority assigned by a Cisco IP Phone This network configuration is one way to connect a Cisco 7960 IP Phone The Cisco IP Phone contains an integrated three port 10 100 switch The ports provide dedicated connections to these devices e Port 1 connects to the switch or other voice over IP VoIP device e Port 2 is an internal 10 100 interface that carries the IP phone traffic e Port 3 access port connects to a PC or other device Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 OL 29440 01
94. d port that you shut down in Step 4 and enters interface configuration mode Example Switch config interface gigabitethernet1 0 3 Step 10 no shutdown Reenables the routed port It will be assigned a new internal VLAN ID Example Switch config no shutdown Step 11 end Returns to privileged EXEC mode Example Switch config end Step 12 copy running config startup config Saves your entries in the switch startup configuration file To save Example Switch copy running config startup config an extended range VLAN configuration you need to save the VTP transparent mode configuration and the extended range VLAN configuration in the switch startup configuration file Otherwise if the switch resets it will default to VTP server mode and the extended range VLAN IDs will not be saved Note This step is not required for VTP version 3 because VLANs are saved in the VLAN database Monitoring VLANs E Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 Table 9 Privileged EXEC show Commands Command Purpose show interfaces vlan v an id Displays characteristics for all interfaces or for the specified VLAN configured on the switch OL 29440 01 Configuring VLANs Configuration Examples i Configuration Examples Example Creating a VLAN Name This example shows how to create Ethernet VLAN 20 name it test20 and add it to the VLAN database Switch
95. d secondary VLANs e You can apply router ACLs only on the primary VLAN SVIs The ACL is applied to both primary and secondary VLAN Layer 3 traffic e Although private VLANs provide host isolation at Layer 2 hosts can communicate with each other at Layer 3 e Private VLANs support these Switched Port Analyzer SPAN features e You can configure a private VLAN port as a SPAN source port e You can use VLAN based SPAN VSPAN on primary isolated and community VLANs or use SPAN on only one VLAN to separately monitor egress or ingress traffic Private VLAN Port Configuration Follow these guidelines when configuring private VLAN ports e Use only the private VLAN configuration commands to assign ports to primary isolated or community VLANs Layer 2 access ports assigned to the VLANs that you configure as primary isolated or community VLANs are inactive while the VLAN is part of the private VLAN configuration Layer 2 trunk interfaces remain in the STP forwarding state e Do not configure ports that belong to a PAgP or LACP EtherChannel as private VLAN ports While a port is part of the private VLAN configuration any EtherChannel configuration for it is inactive Enable Port Fast and BPDU guard on isolated and community host ports to prevent STP loops due to misconfigurations and to speed up STP convergence When enabled STP applies the BPDU guard feature to all Port Fast configured Layer 2 LAN ports Do not enable Port Fast and BPD
96. e Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 OL 29440 01 Configuring IEEE 802 10 and Layer 2 Protocol Tunneling Layer 2 Protocol Tunneling on Ports SP switch remote customer switches receive the PDUs and can negotiate the automatic creation of EtherChannels For example in the following figure Layer 2 Protocol Tunneling for EtherChannels Customer A has two switches in the same VLAN that are connected through the SP network When the network tunnels PDUs switches on the far ends of the network can negotiate the automatic creation of EtherChannels without needing dedicated lines Figure 14 Layer 2 Protocol Tunneling for EtherChannels EtherChannel 1 uo a Ns BherChanne 1 Frovider xe QustomerA A I VLAN 17 4 j WLAN 17 Site 1 J appe VLAN 18 Switch A Switch VLAN IEA t ee tt osteo VLAN 19 VLAN 19 2eteof fo ga apes VLAN 20 AEREE o __Switch B Switch D of Site 2 Se 101344 h wI Trunk Layer 2 Protocol Tunneling on Ports amp You can enable Layer 2 protocol tunneling by protocol on the ports that are connected to the customer in the edge switches of the service provider network The service provider edge switches connected to the customer switch perform the tunneling process Edge switch tunnel ports are connected to customer IEEE 802 1Q trunk ports Edge switch access ports are connected to customer access ports The edge switches con
97. e Example Switch config interface gigabitethernet1 0 1 Step 9 switchport mode trunk Configures the port as a trunk port Example Switch config if switchport mode trunk Step 10 end Returns to privileged EXEC mode Example Switch config if end OL 29440 01 Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 i Configuring VLAN Trunks A Configuring Trunk Ports for Load Sharing Command or Action Purpose Step 11 show interfaces interface id switchport Verifies the VLAN configuration Example Switch show interfaces gigabitethernet1 0 1 Step 12 Repeat the above steps on Switch A for a second port in the switch or switch stack Step 13 Repeat the above steps on Switch B to configure the trunk ports that connect to the trunk ports configured on Switch A Step 14 show vlan When the trunk links come up VTP passes the VTP and VLAN information to Switch B This command verifies Example that Switch B has learned the VLAN configuration Switch show vlan Step 15 configure terminal Enters global configuration mode on Switch A Example Switch configure terminal Step 16 interface interface id Defines the interface to set the STP port priority and enters interface configuration mode Example Switch config interface gigabitethernet1 0 1 Step 17 spanning tree vlan vlan range port priority Assigns the port priority for the VLAN range specified priority
98. e or auto mode switchport mode trunk Puts the interface into permanent trunking mode and negotiates to convert the neighboring link into a trunk link The interface becomes a trunk interface even if the neighboring interface is not a trunk interface switchport nonegotiate Prevents the interface from generating DTP frames You can use this command only when the interface switchport mode is access or trunk You must manually configure the neighboring interface as a trunk interface to establish a trunk link switchport mode dot1q tunnel Configures the interface as a tunnel nontrunking port to be connected in an asymmetric link with an IEEE 802 1Q trunk port The IEEE 802 1Q tunneling is used to maintain customer VLAN integrity across a service provider network switchport mode private vlan Configures the private VLAN mode Note The switchport mode private vlan command option is not supported Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 OL 29440 01 Configuring VLAN Trunks Allowed VLANs on a Trunk Allowed VLANs on a Trunk By default a trunk port sends traffic to and receives traffic from all VLANs All VLAN IDs 1 to 4094 are allowed on each trunk However you can remove VLANs from the allowed list preventing traffic from those VLANs from passing over the trunk To reduce the risk of spanning tree loops or storms you can disable VLAN 1 on any individual VL
99. e destination devices You can only enable VTP pruning on a switch in VTP server mode With VTP versions and 2 when you enable pruning on the VTP server it is enabled for the entire VTP domain In VTP version 3 you must manually enable pruning on each switch in the domain Only VLANs included in the pruning eligible list can be pruned By default VLANs 2 through 1001 are pruning eligible on trunk ports Reserved VLANs and extended range VLANs cannot be pruned OL 29440 01 Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 E Configuring VTP A Enabling VTP Pruning Before You Begin VTP pruning is not designed to function in VTP transparent mode If one or more switches in the network are in VTP transparent mode you should do one of these Turn off VTP pruning in the entire network Turn off VTP pruning by making all VLANs on the trunk of the switch upstream to the VTP transparent switch pruning ineligible To configure VTP pruning on an interface use the switchport trunk pruning vlan interface configuration command VTP pruning operates when an interface is trunking You can set VLAN pruning eligibility whether or not VTP pruning is enabled for the VTP domain whether or not any given VLAN exists and whether or not the interface is currently trunking SUMMARY STEPS 1 configure terminal 2 vtp pruning 3 end 4 show vtp status DETAILED STEPS Command or Action Purpose Ste
100. e network figure Customer A was assigned VLAN 30 and Customer B was assigned VLAN 40 Packets entering the edge switch tunnel ports with IEEE 802 1Q tags are double tagged when they enter the service provider network with the outer tag containing VLAN ID 30 or 40 appropriately and the inner tag containing the original VLAN number for example VLAN 100 Even if both Customers A and B have VLAN 100 in their networks the traffic remains segregated within the service provider network because the outer tag is different Each customer controls its own VLAN numbering space which is independent of the VLAN numbering space used by other customers and the VLAN numbering space used by the service provider network At the outbound tunnel port the original VLAN numbers on the customer s network are recovered It is possible to have multiple levels of tunneling and tagging but the switch supports only one level in this release If traffic coming from a customer network is not tagged native VLAN frames these packets are bridged or routed as normal packets All packets entering the service provider network through a tunnel port on an edge switch are treated as untagged packets whether they are untagged or already tagged with IEEE 802 1Q headers The packets are encapsulated with the metro tag VLAN ID set to the access VLAN of the tunnel port when they are sent through the service provider network on an IEEE 802 1Q trunk port The priority field on the metro
101. e packets to all tunnel or OL 29440 01 Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 Configuring IEEE 802 10 and Layer 2 Protocol Tunneling Default Layer 2 Protocol Tunneling Configuration access ports in the same metro VLAN Therefore the Layer 2 PDUs remain intact and are delivered across the service provider infrastructure to the other side of the customer network See the Layer 2 Protocol Tunneling figure in Layer 2 Protocol Tunneling Overview on page 129 with Customer X and Customer Y in access VLANs 30 and 40 respectively Asymmetric links connect the customers in Site 1 to edge switches in the service provider network The Layer 2 PDUs for example BPDUs coming into Switch B from Customer Y in Site are forwarded to the infrastructure as double tagged packets with the well known MAC address as the destination MAC address These double tagged packets have the metro VLAN tag of 40 as well as an inner VLAN tag for example VLAN 100 When the double tagged packets enter Switch D the outer VLAN tag 40 is removed the well known MAC address is replaced with the respective Layer 2 protocol MAC address and the packet is sent to Customer Y on Site 2 as a single tagged frame in VLAN 100 You can also enable Layer 2 protocol tunneling on access ports on the edge switch connected to access or trunk ports on the customer switch In this case the encapsulation and decapsulation process is the s
102. eating a VLAN Name on page 57 Catalyst 2960 XR Switch VLAN Configuration Guide Cisco IOS Release 15 0 2 EX1 OL 29440 01 Configuring VLANs Extended Range VLAN Configuration Guidelines i Extended Range VLAN Configuration Guidelines VTP 3 only supports extended range VLANs Extended range VLANs are VLANs with IDs from 1006 to 4094 Follow these guidelines when creating extended range VLANs e VLAN IDs in the extended range are not saved in the VLAN database and are not recognized by VTP unless the switch is running VTP version 3 e You cannot include extended range VLANs in the pruning eligible range In VTP version 1 and 2 a switch must be in VTP transparent mode when you create extended range VLANs If VTP mode is server or client an error message is generated and the extended range VLAN is rejected VTP version 3 supports extended VLANs in server and transparent modes e For VTP version 1 or 2 you can set the VTP mode to transparent in global configuration mode You should save this configuration to the startup configuration so that the switch boots up in VTP transparent mode Otherwise you lose the extended range VLAN configuration if the switch resets If you create extended range VLANs in VTP version 3 you cannot convert to VTP version 1 or 2 STP is enabled by default on extended range VLANs but you can disable it by using the no spanning tree vlan vlan id global configuration command When the maximum num
103. eling 121 VLAN trunks 61 VLANs 39 Voice VLAN 149 VTP 13 primary server 35 primary VLAN configuration 84 priority 155 overriding CoS 155 private VLAN 85 96 98 99 configuring Layer 2 interface 96 configuring promiscuous port 98 mapping secondary VLANs 99 port configuration 85 private VLAN domains 87 private VLANs 86 90 91 broadcast 91 limitations 86 multicast 91 multiple switches 90 private VLANs continued unicast 91 private VLAN 93 configuring 93 pruning eligible list 71 PVST mode 66 reconfirmation interval changing 114 reconfirmation interval VMPS changing 114 reconfirming 113 114 reconfirming dynamic VLAN membership 113 reconfirming membership 113 restrictions 40 62 108 150 VLAN trunks 62 VLANs 40 voice VLANs 150 retry count changing 115 retry count VMPS changing 115 S secondary VLAN configuration 84 secondary VLANs 88 static access ports 50 STP path cost 77 STP port priorities 73 switch stacks 20 System MTU 128 T Token Ring VLANs 43 Token Rings 28 troubleshooting 116 trunk 67 configuration 67 trunk port 67 trunking 62 trunking modes 62 trunks 64 allowed VLANs 64 types of connections 111 V VLAN 40 definition 40 E Catalyst 2960 XR Switch VLAN Configuration Guide Cisco IOS Release 15 0 2 EX1 OL 29440 01 Index VLAN membership 113 confirming 113 VLAN monitoring commands 56 VLAN port membership modes 41 VMPS 109 110 113 114 115 116 dynamic port mem
104. ep 14 Repeat Steps 9 through 13 on the other configured trunk interface on Switch A and set the spanning tree path cost to 30 for VLANs 8 9 and 10 exit Returns to privileged EXEC mode Example Switch config exit Step 15 show running config Example Switch show running config Verifies your entries In the display verify that the path costs are set correctly for both trunk interfaces Step 16 copy running config startup config Example Switch copy running config startup config Optional Saves your entries in the configuration file Related Topics Network Load Sharing Using STP Path Cost on page 65 Configuration Examples for VLAN Trunking Example Configuring an IEEE 802 10 Trunk E Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 This example shows how to configure a port as an IEEE 802 1Q trunk The example assumes that the neighbor interface is configured to support IEEE 802 1Q trunking Switch configure terminal Enter configuration commands one per line End with CNTL Z Switch config interface gigabitethernet0 2 Switch config if switchport mode dynamic desirable Switch config if switchport trunk encapsulation dotlq Switch config if end OL 29440 01 Configuring VLAN Trunks Example Removing a VLAN i Related Topics Configuring a Trunk Port on page 67 Feature Interactions on page 66 Example Removing a
105. er Note To provide interoperability with third party vendors you can use the Layer 2 protocol tunnel bypass feature Bypass mode transparently forwards control PDUs to vendor switches that have different ways of controlling protocol tunneling You implement bypass mode by enabling Layer 2 protocol tunneling on the egress trunk port When Layer 2 protocol tunneling is enabled on the trunk port the encapsulated tunnel MAC address is removed and the protocol packets have their normal MAC address Layer 2 protocol tunneling can be used independently or can enhance IEEE 802 1Q tunneling If protocol tunneling is not enabled on IEEE 802 1Q tunneling ports remote switches at the receiving end of the service provider network do not receive the PDUs and cannot properly run STP CDP and VTP When protocol tunneling is enabled Layer 2 protocols within each customer s network are totally separate from those running within the service provider network Customer switches on different sites that send traffic through the service provider network with IEEE 802 1Q tunneling achieve complete knowledge of the customer s VLAN If IEEE 802 1Q tunneling is not used you can still enable Layer 2 protocol tunneling by connecting to the customer switch through access ports and by enabling tunneling on the service provider access port For example in the following figure Layer 2 Protocol Tunneling Customer X has four switches in the same VLAN that are conne
106. erface gigabitethernet1 0 1 Step 3 vtp Enables VTP on the specified port Note To disable VTP on the interface use the no Example vtp interface configuration command Switch config vtp Step 4 end Returns to privileged EXEC mode Example Switch config end OL 29440 01 Catalyst 2960 XR Switch VLAN Configuration Guide Cisco IOS Release 15 0 2 EX1 E Configuring VTP Adding a VTP Client Switch to a VTP Domain Command or Action Purpose Step 5 show running config interface interface id Verifies the change to the port Example Switch show running config interface gigabitethernet1 0 1 Step 6 show vtp status Verifies the configuration Example Switch show vtp status Related Topics Example Configuring VTP on a Per Port Basis on page 36 Adding a VTP Client Switch to a VIP Domain Follow these steps to verify and reset the VTP configuration revision number on a switch before adding it to a VTP domain Before You Begin Before adding a VTP client to a VTP domain always verify that its VTP configuration revision number is lower than the configuration revision number of the other switches in the VTP domain Switches in a VTP domain always use the VLAN configuration of the switch with the highest VTP configuration revision number With VTP versions 1 and 2 adding a switch that has a revision number higher than the revision number in the VTP domain can erase all VLAN informati
107. erify commands enable command that you have entered Use a password to protect access to this mode Global While in privileged i To exit to privileged Use this mode to configuration EXEC mode enter miten config ESE mode enter configure the configure exit or end or press parameters that command Ctrl Z apply to the entire switch VLAN While in global To exit to global Use this mode to configuration configuration mode aia eee ea configuration mode configure VLAN enter the vlan enter the exit parameters When vlan id command command VTP mode is To return to ee you can rivileged EXEC AS k R Ctri z tended range j VLANs VLAN IDs or enter end greater than 1005 and save configurations in the switch startup configuration file Interface While in global ae To exit to global Use this mode to gt a Switch config if configuration configuration mode configuration mode configure enter the interface enter exit parameters for the command with a To ret rhito Ethernet ports specific interface privileged EXEC mode press Ctrl Z or enter end E Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 OL 29440 01 Using the Command Line Interface Using the Help System Using the Help System SUMMARY STEPS DETAILED STEPS Mode Access Method Prompt Exit Method About This Mode Line configuration While in global oy To exit to global Use this mode
108. ernet1 0 22 Switch config if switchport mode private vlan host Switch config if switchport private vlan host association 20 501 Switch config if end Switch show interfaces gigabitethernet1 0 22 switchport Name Gil 0 22 Switchport Enabled Administrative Mode private vlan host Operational Mode private vlan host Administrative Trunking Encapsulation negotiate Operational Trunking Encapsulation native Catalyst 2960 XR Switch VLAN Configuration Guide Cisco IOS Release 15 0 2 EX1 OL 29440 01 Configuring Private VLANs Example Configuring an Interface as a Private VLAN Promiscuous Port i Negotiation of Trunking Off Access Mode VLAN 1 default Trunking Native Mode VLAN 1 default Administrative Native VLAN tagging enabled Voice VLAN none Administrative private vlan host association 20 501 Administrative private vlan mapping none Administrative private vlan trunk native VLAN none Administrative private vlan trunk Native VLAN tagging enabled Administrative private vlan trunk encapsulation dotlgq Administrative private vlan trunk normal VLANs none Administrative private vlan trunk private VLANs none Operational private vlan 20 501 lt output truncated gt Related Topics Configuring a Layer 2 Interface as a Private VLAN Host Port on page 96 Private VLANs Ports on page 88 Example Configuring an Interface as a Private VLAN Promiscuous Port This example shows how to configure an inter
109. ery the secondary VMPS e VMPS domain server The IP address of the configured VLAN membership policy servers The switch sends queries to the one marked current The one marked primary is the primary server e VMPS Action The result of the most recent reconfirmation attempt A reconfirmation attempt can occur automatically when the reconfirmation interval expires or you can force it by entering the vmps reconfirm privileged EXEC command or its Network Assistant or SNMP equivalent This is an example of output for the show vmps privileged EXEC command Switch show vmps VOP Client Status VMPS VQP Version 1 Reconfirm Interval 60 min Server Retry Count 3 VMPS domain server 172 20 128 86 primary current 172 2012887 Reconfirmation status Configuration Example for VMPS Example VMPS Configuration This network has a VMPS server switch and VMPS client switches with dynamic access ports with this configuration The VMPS server and the VMPS client are separate switches e The Catalyst 6500 series Switch A is the primary VMPS server e The Catalyst 6500 series Switch C and Switch J are secondary VMPS servers e End stations are connected to the clients Switch B and Switch I The database configuration file is stored on the TFTP server with the IP address 172 20 22 7 Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 OL 29440 01 Configuring VMPS Where to Go Next Fi
110. es for VMPS e You should configure the VMPS before you configure ports as dynamic access ports e When you configure a port as a dynamic access port the spanning tree Port Fast feature is automatically enabled for that port The Port Fast mode accelerates the process of bringing the port into the forwarding state Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 OL 29440 01 Configuring VMPS A Restrictions for VMPS Restrictions for VMPS IEEE 802 1x ports cannot be configured as dynamic access ports If you try to enable IEEE 802 1x on a dynamic access VQP port an error message appears and IEEE 802 1x is not enabled If you try to change an IEEE 802 1x enabled port to dynamic VLAN assignment an error message appears and the VLAN configuration is not changed Trunk ports cannot be dynamic access ports but you can enter the switchport access vlan dynamic interface configuration command for a trunk port In this case the switch retains the setting and applies it if the port is later configured as an access port You must turn off trunking on the port before the dynamic access setting takes effect e Dynamic access ports cannot be monitor ports e Secure ports cannot be dynamic access ports You must disable port security on a port before it becomes dynamic e Private VLAN ports cannot be dynamic access ports e Dynamic access ports cannot be members of an EtherChannel group Po
111. eturn the port to its default setting use the no switchport priority extend interface configuration command E Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 OL 29440 01 Configuring Voice VLANs Monitoring Voice VLAN i Command or Action Purpose Step 4 end Example Switch config if end Returns to privileged EXEC mode Step 5 show interfaces interface id switchport Example Switch show interfaces gigabitethernet1 0 1 switchport Verifies your entries Step 6 copy running config startup config Example Switch copy running config startup config Optional Saves your entries in the configuration file Related Topics Cisco IP Phone Data Traffic on page 151 Example Configuring a Port Connected to an IP Phone Not to Change Frame Priority on page 158 Monitoring Voice VLAN To display voice VLAN configuration for an interface use the show interfaces interface id switchport privileged EXEC command Configuration Examples for Voice VLANs Example Configuring Cisco IP Phone Voice Traffic This example shows how to configure a port connected to a Cisco IP Phone to use the CoS value to classify incoming traffic and to accept voice and data priority traffic tagged with VLAN ID 0 Switch configure terminal Enter configuration commands one per line End with CNTL Z Switch config interface gigabitethernet1 0 1 Switch co
112. face as a private VLAN promiscuous port and map it to a private VLAN The interface is a member of primary VLAN 20 and secondary VLANs 501 to 503 are mapped to it Switch configure terminal Switch config interface gigabitethernet1 0 2 Switch config if switchport mode private vlan promiscous Switch config if switchport private vlan mapping 20 add 501 503 Switch config if end Related Topics Configuring a Layer 2 Interface as a Private VLAN Promiscuous Port on page 98 Private VLANs Ports on page 88 Example Mapping Secondary VLANs to a Primary VLAN Interface This example shows how to map the interfaces fo VLANs 501 and 502 to primary VLAN 10 which permits routing of secondary VLAN ingress traffic from private VLANs 501 and 502 Switch configure terminal Switch config interface vlan 10 Switch config if private vlan mapping 501 502 Switch config if end Switch show interfaces private vlan mapping Interface Secondary VLAN Type vlan10 501 isolated vlan10 502 community Related Topics Mapping Secondary VLANs to a Primary VLAN Layer 3 VLAN Interface on page 99 OL 29440 01 Catalyst 2960 XR Switch VLAN Configuration Guide Cisco IOS Release 15 0 2 EX1 E Configuring Private VLANs Example Monitoring Private VLANs Example Monitoring Private VLANs This example shows output from the show vlan private vlan command Switch config show vlan private vlan Primary Secondary Type Ports 10 501
113. face is a tunnel port show 12protocol tunnel Displays information about Layer 2 protocol tunneling ports show errdisable recovery Verifies if the recovery timer from a Layer 2 protocol tunnel error disable state is enabled show 12protocol tunnel interface interface id Displays information about a specific Layer 2 protocol tunneling port show 12protocol tunnel summary Displays only Layer 2 protocol summary information show vlan dotlq tag native Displays the status of native VLAN tagging on the switch OL 29440 01 Configuring IEEE 802 10 and Layer 2 Protocol Tunneling Where to Go Next You can configure the following e VIP e VLANs VLAN Trunking e Private VLANs e VLAN Membership Policy Server VMPS e Voice VLANs Additional References Related Documents Where to Go Next Related Topic Document Title For complete syntax and usage information for the commands used in this chapter Catalyst 2960 XR Switch VLAN Management Command Reference Standards and RFCs Standard RFC Title MIBs MIB MIBs Link All supported MIBs for this release To locate and download MIBs for selected platforms Cisco IOS releases and feature sets use Cisco MIB Locator found at the following URL http www cisco com go mibs OL 29440 01 Catalyst 2960 XR Switch VLAN Configuration Guide Cisco IOS Release 15 0 2 EX1 E
114. figuration mode Example Switch configure terminal Step 2 interface interface id Specifies the interface connected to the phone and enters interface configuration mode Example Switch config interface gigabitethernet1 0 1 Step 3 switchport mode dotlq tunnel Configures the interface as an IEEE 802 1Q tunnel port Example Switch config if switchport mode dotiq tunnel Step 4 12protocol tunnel point to point pagp lacp Optional Enables point to point protocol tunneling for the desired udld protocol If no keyword is entered tunneling is enabled for all three protocols Example Note To avoid a network failure make sure that the network is a Switch config if l2protocol tunnel point to point topology before you enable tunneling for PAgP point to point pagp LACP or UDLD packets Note Use the no l2protocol tunnel point to point pagp lacp udld interface configuration command to disable point to point protocol tunneling for one of the Layer 2 protocols or for all three Step 5 l2protocol tunnel shutdown threshold Optional Configures the threshold for packets per second accepted point to point pagp lacp udld value for encapsulation The interface is disabled if the configured threshold is exceeded If no protocol option is specified the threshold applies to Example each of the tunneled Layer 2 protocol types The range is 1 to 4096 The default is to have no threshold configured Switch config if l2protocol
115. figure your switch OL 29440 01 Using the Command Line Interface Table 2 Common CLI Error Messages Configuration Logging i Error Message How to Get Help o Ambiguous command con show You did not enter enough characters for your switch to recognize the command Reenter the command followed by a question mark with a space between the command and the question mark The possible keywords that you can enter with the command appear o Incomplete command You did not enter all the keywords or values required by this command Reenter the command followed by a question mark with a space between the command and the question mark The possible keywords that you can enter with the command appear Invalid input detected at marker You entered the command incorrectly The caret marks the point of the error Enter a question mark to display all the commands that are available in this command mode The possible keywords that you can enter with the command appear Configuration Logging L Note You can log and view changes to the switch configuration You can use the Configuration Change Logging and Notification feature to track changes on a per session and per user basis The logger tracks each configuration command that is applied the user who entered the command the time that the command was entered and the parser retur
116. g page 133 e Configuration Examples for IEEE 802 1Q and Layer 2 Protocol Tunneling page 143 e Monitoring Tunneling Status page 146 e Where to Go Next page 147 Additional References page 147 e Feature History and Information for Tunneling page 148 Finding Feature Information Your software release may not support all the features documented in this module For the latest feature information and caveats see the release notes for your platform and software release Use Cisco Feature Navigator to find information about platform support and Cisco software image support To access Cisco Feature Navigator go to http www cisco com go cfn An account on Cisco com is not required Prerequisites for Configuring Tunneling The following sections list prerequisites and considerations for configuring IEEE 802 1Q and Layer 2 protocol tunneling Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 OL 29440 01 Configuring IEEE 802 10 and Layer 2 Protocol Tunneling IEEE 802 10 Tunneling and Incompatibilities IEEE 802 10 Tunneling and Incompatibilities Although IEEE 802 1Q tunneling works well for Layer 2 packet switching there are incompatibilities between some Layer 2 features and Layer 3 switching e A tunnel port cannot be a routed port e IP routing is not supported on a VLAN that includes IEEE 802 1Q ports Packets received from a tunnel port are forwarded based only on Layer 2 information
117. g an Ethernet Interface as a Trunk Port Configuring a Trunk Port Because trunk ports send and receive VTP advertisements to use VTP you must ensure that at least one trunk port is configured on the switch and that this trunk port is connected to the trunk port of a second switch Otherwise the switch cannot receive any VTP advertisements Before You Begin SUMMARY STEPS configure terminal interface interface id switchport mode dynamic auto desirable trunk switchport access vlan vlan id switchport trunk native vlan vian id end show interfaces interface id switchport show interfaces interface id trunk scone FWD copy running config startup config Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 OL 29440 01 Configuring VLAN Trunks Configuring an Ethernet Interface as a Trunk Port DETAILED STEPS Command or Action Purpose Step 1 configure terminal Enters the global configuration mode Example Switch configure terminal Step 2 interface interface id Specifies the port to be configured for trunking and enters interface configuration mode Example Switch config interface gigabitethernet1 0 2 Step 3 switchport mode dynamic auto desirable Configures the interface as a Layer 2 trunk required only if the trunk interface is a Layer 2 access port or tunnel port or to specify the trunking mode Example e dynamic auto Sets the interface t
118. gible the flooding continues VTP pruning is supported in all VTP versions E Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 OL 29440 01 Configuring VTP VTP Pruning VTP pruning is disabled in the switched network Port 1 on Switch A and Port 2 on Switch D are assigned to the Red VLAN If a broadcast is sent from the host connected to Switch A Switch A floods the broadcast and every switch in the network receives it even though Switches C E and F have no ports in the Red VLAN Figure 1 Flooding Traffic without VTP Pruning A hyn Da a a Switch F Switch C SwitthA 5M if VTP pruning is enabled in the switched network The broadcast traffic from Switch A is not forwarded to Switches C E and F because traffic for the Red VLAN has been pruned on the links shown Port 5 on Switch B and Port 4 on Switch D Figure 2 Optimized Flooded Traffic VIP Pruning 8566 SORE EEE EEE EEE EEE EE EES Floded traffic __ essaucvocens is pruned Port Fi Switch B Red VLAN Switch E Flooded traffic N F i pruned Port f a a ao a Switch F Switch C Switch A Enabling VTP pruning on a VTP server enables pruning for the entire management domain Making VLANs pruning eligible or pruning ineligible affects pruning eligibility for those VLANs on that trunk only not on all switches in the VTP domain VTP pruning takes effect several seconds after you
119. gure 8 Dynamic Port VLAN Membership Configuration Catalyst 6500 series switch A Primary VMPS Server 1 172 20 26 150 Client switch B End Dynamic access port station 1 j d ii inaa 51 Trunk port i Switch C gea VMPS 172 20 26 152 Server 2 Switch D 172 20 26 153 Switch E 172 20 26 154 Switch F 172 20 26 155 172 20 26 156 Switch G Switch H 172 20 26 157 i Client switch End Dynamic access por station 2 m MUELA 58 172 20 26 159 Catalyst 6500 series Secondary VMPS Server 3 Switch J Trunk port Related Topics Configuring Dynamic Access Ports on VMPS Clients on page 111 Dynamic VLAN Assignments on page 108 Configuring Dynamic Access Ports on VMPS Clients on page 111 Dynamic Access Port VLAN Membership on page 109 Where to Go Next You can configure the following o gt uy yuna wewBes au124 3 lt 1013631 Catalyst 2960 XR Switch VLAN Configuration Guide Cisco IOS Release 15 0 2 EX1 OL 29440 01 Configuring VMPS e VTP e VLANs e VLAN Trunking e Private VLANs Tunneling e Voice VLANs Additional References Related Documents Additional References i Related Topic Document Title For complete syntax and usage information for the commands used in this chapter Catalyst 2960 XR Switch VLAN Management Command Reference Standards and RFCs Standard RFC Title MIBs MIB MIBs L
120. he supported switches Switches running VTP Version 2 advertise information about these Token Ring VLANs Token Ring TrBRF VLANs Token Ring TrCRF VLANs amp Note For more information on configuring Token Ring VLANs see the Catalyst 5000 Series Software Configuration Guide Normal Range VLANs Configuration Process You configure VLANs in the vlan global configuration command by entering a VLAN ID Enter a new VLAN ID to create a VLAN or enter an existing VLAN ID to modify that VLAN You can use the default VLAN configuration or enter multiple commands to configure the VLAN For more information about commands available in this mode see the vlan global configuration command description in the command reference for this release When you have finished the configuration you must exit VLAN configuration mode for the configuration to take effect To display the VLAN configuration enter the show vlan privileged EXEC command VLAN Configuration Saving Process The configurations of VLAN IDs 1 to 1005 are always saved in the VLAN database vlan dat file If the VTP mode is transparent they are also saved in the switch running configuration file You can enter the copy running config startup config privileged EXEC command to save the configuration in the startup configuration file In a switch stack the whole stack uses the same vlan dat file and running configuration To display the VLAN configuration enter the show vlan privileged EX
121. hese steps 1 Set VTP mode to transparent 2 Create the primary and secondary VLANs and associate them N Note Ifthe VLAN is not created already the private VLAN configuration process creates it Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 OL 29440 01 Configuring Private VLANs Default Private VLAN Configuration i 3 Configure interfaces to be isolated or community host ports and assign VLAN membership to the host port 4 Configure interfaces as promiscuous ports and map the promiscuous ports to the primary secondary VLAN pair 5 If inter VLAN routing will be used configure the primary SVI and map the secondary VLANs to the primary 6 Verify the private VLAN configuration Default Private VLAN Configuration No private VLANs are configured How to Configure Private VLANs Configuring and Associating VLANs in a Private VLAN The private vlan commands do not take effect until you exit VLAN configuration mode SUMMARY STEPS configure terminal vtp mode transparent vlan vlan id private vlan primary exit vlan vlan id private vlan isolated exit o OoN PO FWD vlan vlan id 10 private vlan community 11 exit 12 vlan vlan id 13 private vlan association add remove secondary_vlan_list 14 end 15 show vlan private vlan type or show interfaces status 16 copy running config startup config Catalyst 2960 XR Switch VLAN Configuration Guide Cisco
122. ifies desirable for the PAgP mode Example Switch config if channel group 25 mode desirable Step 6 exit Returns to global configuration mode Example Switch config if exit Step 7 interface port channel port channel number Enters port channel interface mode Example Switch config interface port channel port channel 25 Step 8 shutdown Shuts down the interface Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 OL 29440 01 Configuring IEEE 802 10 and Layer 2 Protocol Tunneling Configuration Examples for IEEE 802 10 and Layer 2 Protocol Tunneling i Command or Action Purpose Example Switch config shutdown Step 9 no shutdown Enables the interface Example Switch config no shutdown Step 10 end Returns to privileged EXEC mode Example Switch config end Step 11 show 12protocol Displays the Layer 2 tunnel ports on the switch including the protocols configured the thresholds and the counters Example Switch show 12protocol Step 12 copy running config startup config Optional Saves your entries in the configuration file Example Switch copy running config startup config Note Use the no switchport mode trunk the no udld enable and the no channel group channel group number mode desirable interface configuration commands to return the interface to the default settings Related Topics Examples Configuri
123. ig if switchport mode access Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 OL 29440 01 Configuring VMPS Reconfirming VLAN Memberships i Command or Action Purpose Step 4 switchport access vlan dynamic Configures the port as eligible for dynamic VLAN membership Example The dynamic access port must be connected to an end Switch config if switchport access vlan dynamic station Step 5 end Returns to privileged EXEC mode Example Switch config end Step 6 show interfaces interface id switchport Verifies your entries in the Operational Mode field of the display Example Switch show interfaces gigabitethernet 1 0 1 switchport Step 7 copy running config startup config Optional Saves your entries in the configuration file Example Switch copy running config startup config Related Topics Dynamic VLAN Assignments on page 108 Example VMPS Configuration on page 117 Dynamic Access Port VLAN Membership on page 109 Example VMPS Configuration on page 117 Reconfirming VLAN Memberships This task confirms the dynamic access port VLAN membership assignments that the switch has received from the VMPS SUMMARY STEPS 1 vmps reconfirm 2 show vmps OL 29440 01 Catalyst 2960 XR Switch VLAN Configuration Guide Cisco IOS Release 15 0 2 EX1 E Configuring VMPS Changing the Reconfirmation Interval DETAILED STEPS Com
124. iguration Examples for Private VLANs Configuration Examples for Private VLANs Example Configuring a Primary VLAN Isolated VLAN and a Community of VLANs This example shows how to configure VLAN 20 as a primary VLAN VLAN 501 as an isolated VLAN and VLANs 502 and 503 as community VLANs to associate them in a private VLAN and to verify the configuration Switch configure terminal Switch config vlan 20 Switch config vlan private vlan primary Switch config vlan exit Switch config vlan 501 Switch config vlan private vlan isolated Switch config vlan exit Switch config vlan 502 Switch config vlan private vlan community Switch config vlan exit Switch config vlan 503 Switch config vlan private vlan community Switch config vlan exit Switch config vlan 20 Switch config vlan private vlan association 501 503 Switch config vlan end Switch config show vlan private vlan n n Primary Secondary Type Ports 20 501 isolated 20 502 community 20 503 community 20 504 non operational Related Topics Configuring and Associating VLANs in a Private VLAN on page 93 Private VLAN Domains on page 87 Example Configuring an Interface as a Host Port This example shows how to configure an interface as a private VLAN host port associate it with a private VLAN pair and verify the configuration Switch configure terminal Switch config interface gigabiteth
125. igured shutdown threshold for the protocol is reached You can manually reenable the port by entering a shutdown and a no shutdown command sequence If errdisable recovery is enabled the operation is retried after a specified time interval e Only decapsulated PDUs are forwarded to the customer network The spanning tree instance running on the service provider network does not forward BPDUs to tunnel ports CDP packets are not forwarded from tunnel ports e When protocol tunneling is enabled on an interface you can set a per protocol per port shutdown threshold for the PDUs generated by the customer network If the limit is exceeded the port shuts down You can also limit BPDU rate by using QoS ACLs and policy maps on a tunnel port e When protocol tunneling is enabled on an interface you can set a per protocol per port drop threshold for the PDUs generated by the customer network If the limit is exceeded the port drops PDUs until the rate at which it receives them is below the drop threshold e Because tunneled PDUs especially STP BPDUs must be delivered to all remote sites so that the customer virtual network operates properly you can give PDUs higher priority within the service provider network than data packets received from the same tunnel port By default the PDUs use the same CoS value as data packets Related Topics Configuring Layer 2 Protocol Tunneling on page 135 Example Configuring Layer 2 Protocol Tunneling on page
126. ing a VTP Version 3 Primary Server 27 Enabling the VTP Version 28 Enabling VTP Pruning 29 Configuring VTP on a Per Port Basis 31 Adding a VTP Client Switch toa VTP Domain 32 Monitoring VTP 34 Configuration Examples for VTP 35 Example Configuring the Switch as a VTP Server 35 Example Configuring a Hidden Password 35 Example Configuring a VTP Version 3 Primary Server 35 Example Configuring VTP on a Per Port Basis 36 Where to Go Next 36 Additional References 36 Feature History and Information for VTP 37 CHAPTER 3 Configuring VLANs 39 Catalyst 2960 XR Switch VLAN Configuration Guide Cisco IOS Release 15 0 2 EX1 OL 29440 01 Contents Finding Feature Information 39 Prerequisites for VLANs 39 Restrictions for VLANs 40 Information About VLANs 40 Logical Networks 40 Supported VLANs 41 VLAN Port Membership Modes 41 Normal Range VLAN Overview 42 Token Ring VLANs 43 Normal Range VLANs Configuration Process 43 VLAN Configuration Saving Process 43 Normal Range VLAN Configuration Guidelines 44 Extended Range VLAN Configuration Guidelines 45 Default Ethernet VLAN Configuration 46 Default VLAN Configuration 46 How to Configure VLANs 47 How to Configure Normal Range VLANs 47 Creating or Modifying an Ethernet VLAN 47 Deleting a VLAN 49 Assigning Static Access Ports toa VLAN 50 How to Configure Extended Range VLANs 52 Creating an Extended Range VLAN 52 Creating an Extended Range VLAN with an Internal VLAN ID 54 Monitoring VLANs 56
127. ink All supported MIBs for this release To locate and download MIBs for selected platforms Cisco IOS releases and feature sets use Cisco MIB Locator found at the following URL http www cisco com go mibs OL 29440 01 Catalyst 2960 XR Switch VLAN Configuration Guide Cisco IOS Release 15 0 2 EX1 E Configuring VMPS Feature History and Information for VMPS Technical Assistance Description Link The Cisco Support website provides extensive online http www cisco com support resources including documentation and tools for troubleshooting and resolving technical issues with Cisco products and technologies To receive security and technical information about your products you can subscribe to various services such as the Product Alert Tool accessed from Field Notices the Cisco Technical Services Newsletter and Really Simple Syndication RSS Feeds Access to most tools on the Cisco Support website requires a Cisco com user ID and password Feature History and Information for VMPS Cisco IOS 15 0 2 EX1 This feature was introduced Catalyst 2960 XR Switch VLAN Configuration Guide Cisco IOS Release 15 0 2 EX1 OL 29440 01 CHAPTER A Configuring IEEE 802 10 and Layer 2 Protocol Tunneling e Finding Feature Information page 121 e Prerequisites for Configuring Tunneling page 121 e Information about Tunneling page 124 e How to Configure Tunnelin
128. interface is disabled if the configured threshold is exceeded If no protocol option is specified the threshold applies to each of the tunneled Layer 2 protocol types The range is 1 to 4096 The default is to have no threshold configured Note If you also set a drop threshold on this interface the shutdown threshold value must be greater than or equal to the drop threshold value Note Use the no 12protocol tunnel shutdown threshold packet_second_rate_value cdp Ndp point to point stp vtp and the no I2protocol tunnel drop threshold packet_second_rate_value cdp lldp point to point stp vtp commands to return the shutdown and drop thresholds to the default settings OL 29440 01 Configuring IEEE 802 10 and Layer 2 Protocol Tunneling Configuring Layer 2 Protocol Tunneling Command or Action Purpose Step 6 12protocol tunnel drop threshold Optional Configures the threshold for packets per second accepted for packet_second_rate_value cdp ldp encapsulation The interface drops packets if the configured threshold is point to point stp vtp exceeded If no protocol option is specified the threshold applies to each of the tunneled Layer 2 protocol types The range is to 4096 The default Example is to have no threshold configured Switch l2protocol tunnel Note If you also set a shutdown threshold on this interface the drop threshold 100 cdp drop threshold value must be les
129. ion file Example Switch copy running config startup config Configuring Trunk Ports for Load Sharing Configuring Load Sharing Using STP Port Priorities If your switch is a member ofa switch stack you must use the spanning tree vlan v an id cost cost interface configuration command instead of the spanning tree vlan v an id port priority priority interface OL 29440 01 Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 m Configuring VLAN Trunks A Configuring Trunk Ports for Load Sharing SUMMARY STEPS DETAILED STEPS Step 1 Step 2 configuration command to select an interface to put in the forwarding state Assign lower cost values to interfaces that you want selected first and higher cost values that you want selected last These steps describe how to configure a network with load sharing using STP port priorities configure terminal vtp domain domain name vtp mode server end show vtp status show vlan configure terminal interface interface id con OO FWD switchport mode trunk pe end show interfaces interface id switchport N Repeat the above steps on Switch A for a second port in the switch or switch stack oo Repeat the above steps on Switch B to configure the trunk ports that connect to the trunk ports configured on Switch A 14 show vlan 15 configure terminal 16 interface interface id 1
130. ions listed in this table These actions are optional amp Note The arrow keys function only on ANSI compatible terminals such as VT100s SUMMARY STEPS 1 Ctrl P or use the up arrow key 2 Ctrl N or use the down arrow key 3 show history DETAILED STEPS Command or Action Purpose Step 1 Ctrl P or use the up arrow key Recalls commands in the history buffer beginning with the most recent command Repeat the key sequence to recall successively older commands Step 2 Ctrl N or use the down arrow key Returns to more recent commands in the history buffer after recalling commands with Ctrl P or the up arrow key Repeat the key sequence to recall successively more recent commands Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 OL 29440 01 Using the Command Line Interface Enabling and Disabling Editing Features Command or Action Purpose Step 3 show history Lists the last several commands that you just entered in privileged EXEC mode The number of commands that appear is controlled by the setting of the terminal Example history global configuration command and the history line configuration Switch show history command Disabling the Command History Feature The command history feature is automatically enabled You can disable it for the current terminal session or for the command line This procedure is optional SUMMARY STEPS 1 terminal no history
131. is reset to Example 0 Switch config end Step 5 show vtp status Verifies that the configuration revision number has been reset to 0 Example Switch show vtp status Step 6 configure terminal Enters global configuration mode Example Switch configure terminal Step 7 vtp domain domain name Enters the original domain name on the switch Example Switch config vtp domain domain012 OL 29440 01 Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 E Configuring VTP Monitoring VTP Command or Action Purpose Step 8 end Returns to privileged EXEC mode The VLAN information on the switch is updated Example Switch config end Step 9 show vtp status Optional Verifies that the domain name is the same as in Step 1 Example Switch show vtp status and that the configuration revision number is 0 Related Topics VTP Domain on page 14 Monitoring VTP This section describes commands used to display and monitor the VTP configuration E Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 You monitor VTP by displaying VTP configuration information the domain name the current VTP revision and the number of VLANs You can also display statistics about the advertisements sent and received by the switch Table 6 VTP Monitoring Commands Command Purpose show vtp counters Displays counters about VTP messages
132. isplay Example Switch show vmps Step 5 copy running config startup config Optional Saves your entries in the configuration file Example Switch copy running config startup config Troubleshooting Dynamic Access Port VLAN Membership Problem The VMPS shuts down a dynamic access port under these conditions Problem The VMPS is in secure mode and it does not allow the host to connect to the port The VMPS shuts down the port to prevent the host from connecting to the network Problem More than 20 active hosts reside on a dynamic access port Solution To reenable a disabled dynamic access port enter the shutdown interface configuration command followed by the no shutdown interface configuration command Catalyst 2960 XR Switch VLAN Configuration Guide Cisco IOS Release 15 0 2 EX1 OL 29440 01 Configuring VMPS Monitoring the VMPS Monitoring the VMPS You can display information about the VMPS by using the show vmps privileged EXEC command The switch displays this information about the VMPS e VMPS VQP Version The version of VQP used to communicate with the VMPS The switch queries the VMPS that is using VQP Version 1 e Reconfirm Interval The number of minutes the switch waits before reconfirming the VLAN to MAC address assignments e Server Retry Count The number of times VQP resends a query to the VMPS If no response is received after this many tries the switch starts to qu
133. itch show interfaces gigabitethernet1 0 2 trunk Step 9 copy running config startup config Optional Saves your entries in the configuration file Example Switch copy running config startup config Note To return an interface to its default configuration use the default interface interface id interface configuration command To reset all trunking characteristics of a trunking interface to the defaults use the no switchport trunk interface configuration command To disable trunking use the switchport mode access interface configuration command to configure the port as a static access port Defining the Allowed VLANs on a Trunk Related Topics Feature Interactions on page 66 Example Configuring an IEEE 802 1Q Trunk on page 80 VLAN 1 is the default VLAN on all trunk ports in all Cisco switches and it has previously been a requirement that VLAN 1 always be enabled on every trunk link You can use the VLAN 1 minimization feature to disable VLAN 1 on any individual VLAN trunk link so that no user traffic including spanning tree advertisements is sent or received on VLAN 1 SUMMARY STEPS configure terminal interface interface id switchport mode trunk end sO oO FWD switchport trunk allowed vlan add all except none remove vian list show interfaces interface id switchport copy running config startup config OL 29440 01 Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release
134. lar customer Example Switch config if switchport access vlan 2 Step 4 switchport mode dot1q tunnel Sets the interface as an IEEE 802 1Q tunnel port OL 29440 01 Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 Configuring IEEE 802 10 and Layer 2 Protocol Tunneling Configuring an IEEE 802 10 Tunneling Port Command or Action Purpose Example Switch config if switchport mode dotiq tunnel Note Use the no switchport mode dot1q tunnel interface configuration command to return the port to the default state of dynamic desirable Step 5 exit Returns to privileged EXEC mode Example Switch config if exit Step 6 vlan dotlq tag native Optional Sets the switch to enable tagging of native VLAN packets on all IEEE 802 1Q trunk ports When not set and a customer Example VLAN ID is the same as the native VLAN the trunk port does not apply a metro tag and packets could be sent to the wrong Switch config vlan dotlq tag native destination Note Use the no vlan dotlq tag native global configuration command to disable tagging of native VLAN packets Step 7 end Returns to privileged EXEC mode Example Switch config end Step 8 Use one of the following Displays the ports configured for IEEE 802 1Q tunneling e show dotlq tunnel Displays the ports that are in tunnel mode e show running config interface Example Switch show dotlq tunnel or Switch show ru
135. learned on SVIs and Layer 3 interfaces These entries do not age out The ip sticky arp global configuration command is supported only on SVIs belonging to private VLANs The ip sticky arp interface configuration command is only supported on Layer 3 interfaces e SVIs belonging to normal VLANs SVIs belonging to private VLANs Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 OL 29440 01 Configuring Private VLANs Private VLAN Port Configuration i For more information about using the ip sticky arp g obal configuration and the ip sticky arp interface configuration commands see the command reference for this release e You can configure VLAN maps on primary and secondary VLANs However we recommend that you configure the same VLAN maps on private VLAN primary and secondary VLANs e When a frame is Layer 2 forwarded within a private VLAN the same VLAN map is applied at the ingress side and at the egress side When a frame is routed from inside a private VLAN to an external port the private VLAN map is applied at the ingress side For frames going upstream from a host port to a promiscuous port the VLAN map configured on the secondary VLAN is applied For frames going downstream from a promiscuous port to a host port the VLAN map configured on the primary VLAN is applied To filter out specific IP traffic for a private VLAN you should apply the VLAN map to both the primary an
136. m an administration workstation Related Topics Configuring a Layer 2 Interface as a Private VLAN Host Port on page 96 Example Configuring an Interface as a Host Port on page 102 Configuring a Layer 2 Interface as a Private VLAN Promiscuous Port on page 98 Example Configuring an Interface as a Private VLAN Promiscuous Port on page 103 Private VLANs in Networks In a switched environment you can assign an individual private VLAN and associated IP subnet to each individual or common group of end stations The end stations need to communicate only with a default gateway to communicate outside the private VLAN You can use private VLANs to control access to end stations in these ways Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 OL 29440 01 Configuring Private VLANs A IP Addressing Scheme with Private VLANs e Configure selected interfaces connected to end stations as isolated ports to prevent any communication at Layer 2 For example if the end stations are servers this configuration prevents Layer 2 communication between the servers e Configure interfaces connected to default gateways and selected end stations for example backup servers as promiscuous ports to allow all end stations access to a default gateway You can extend private VLANs across multiple devices by trunking the primary isolated and community VLANs to other devices that support private VLANs To maintain the sec
137. mand or Action Purpose Step 1 vmps reconfirm Reconfirms dynamic access port VLAN membership Example Switch vmps reconfirm Step 2 show vmps Verifies the dynamic VLAN reconfirmation status Example Switch show vmps Changing the Reconfirmation Interval VMPS clients periodically reconfirm the VLAN membership information received from the VMPS You can set the number of minutes after which reconfirmation occurs amp Note Ifyou are configuring a member switch in a cluster this parameter must be equal to or greater than the reconfirmation setting on the command switch You also must first use the reommand privileged EXEC command to log in to the member switch SUMMARY STEPS 1 configure terminal 2 vmps reconfirm minutes 3 end 4 show vmps 5 copy running config startup config DETAILED STEPS Step 1 Command or Action configure terminal Example Switch configure terminal Purpose Enters the global configuration mode E Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 OL 29440 01 Configuring VMPS Changing the Retry Count Command or Action Purpose Step 2 vmps reconfirm minutes Sets the number of minutes between reconfirmations of the dynamic VLAN membership The range is to 120 The default Example is 60 minutes Switch config vmps reconfirm 90 Note To return the switch to its default setting use the no vm
138. mibs Catalyst 2960 XR Switch VLAN Configuration Guide Cisco IOS Release 15 0 2 EX1 OL 29440 01 Configuring Voice VLANs Feature History and Information for Voice VLAN Technical Assistance Description Link The Cisco Support website provides extensive online http www cisco com support resources including documentation and tools for troubleshooting and resolving technical issues with Cisco products and technologies To receive security and technical information about your products you can subscribe to various services such as the Product Alert Tool accessed from Field Notices the Cisco Technical Services Newsletter and Really Simple Syndication RSS Feeds Access to most tools on the Cisco Support website requires a Cisco com user ID and password Feature History and Information for Voice VLAN Cisco IOS 15 0 2 EX1 This feature was introduced Catalyst 2960 XR Switch VLAN Configuration Guide Cisco IOS Release 15 0 2 EX1 OL 29440 01 INDEX C Cisco 7960 IP Phone 150 Cisco IP Phone Data Traffic 151 Cisco IP Phone Voice Traffic 151 configuring 111 confirming 113 CoS 155 override priority 155 default Ethernet VLAN configuration 46 Default Layer 2 Ethernet Interface VLAN Configuration 66 default private VLAN configuration 93 default VLAN configuration 46 definition 40 VLAN 40 deletion 49 VLAN 49 described 109 domain names 21 dynamic access ports 111 c
139. mmand or Action Purpose Step 4 exit Returns to global configuration mode Example Switch config if exit Step 5 Repeat Steps 2 through 4 on a second interface in Switch A or in Switch A stack Step 6 end Returns to privileged EXEC mode Example Switch config end Step 7 show running config Verifies your entries In the display make sure that the interfaces are configured as trunk ports Example Switch show running config Step 8 show vlan When the trunk links come up Switch A receives the VTP information from the other switches This Example command verifies that Switch A has learned the VLAN configuration Switch show vlan Step 9 configure terminal Enters global configuration mode Example Switch configure terminal Step 10 interface interface id Defines the interface on which to set the STP cost and enters interface configuration mode Example Switch config interface gigabitethernet1 0 1 Step 11 spanning tree vlan vlan range cost cost value Sets the spanning tree path cost to 30 for VLANs 2 Example Switch config if spanning tree vlan 2 4 cost 30 through 4 OL 29440 01 Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 i Configuring VLAN Trunks Configuration Examples for VLAN Trunking Command or Action Purpose Step 12 end Example Switch config if end Returns to global configuration mode Step 13 St
140. mode after the switch restarts you must first configure the VTP domain name before the VTP mode A Caution Ifall switches are operating in VTP client mode do not configure a VTP domain name If you do it is impossible to make changes to the VLAN configuration of that domain Therefore make sure you configure at least one switch as a VTP server Related Topics Enabling the VTP Version on page 28 Default VTP Configuration The following table shows the default VTP configuration Table 5 Default VTP Configuration Feature Default Setting VTP domain name Null VTP mode VTP version 1 and version 2 Server VTP mode VTP version 3 The mode is the same as the mode in VTP version 1 or 2 before conversion to version 3 VTP version Version 1 MST database mode Transparent VTP version 3 server type Secondary Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 OL 29440 01 Configuring VTP A How to Configure VTP Feature Default Setting VTP password None VTP pruning Disabled How to Configure VTP Configuring VTP Mode You can configure VTP mode as one of these e When a switch is in VTP server mode you can change the VLAN configuration and have it propagated throughout the network e When a switch is in VTP client mode you cannot change its VLAN configuration The client switch receives VTP updates from a VTP server in the VTP
141. mple Switch config interface gigabitethernet1 0 22 Enters interface configuration mode for the Layer 2 interface to be configured Step 3 Step 4 Step 5 switchport mode private vlan host Example Switch config if switchport mode private vlan host switchport private vlan host association primary_vlan_id secondary _vlan_id Example Switch config if switchport private vlan host association 20 501 end Example Switch config if end Configures the Layer 2 port as a private VLAN host port Associates the Layer 2 port with a private VLAN Returns to privileged EXEC mode Step 6 show interfaces interface id switchport Example Switch show interfaces gigabitethernet1 0 22 switchport Verifies the configuration Step 7 copy running config startup config Example Switch copy running config startup config Saves your entries in the switch startup configuration file Related Topics Private VLANs Ports on page 88 Example Configuring an Interface as a Host Port on page 102 OL 29440 01 Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 E Configuring Private VLANs A Configuring a Layer 2 Interface as a Private VLAN Promiscuous Port Configuring a Layer 2 Interface as a Private VLAN Promiscuous Port Beginning in privileged EXEC mode follow these steps to configure a Layer 2 interface as a private VLAN promiscu
142. n code for the command This feature includes a mechanism for asynchronous notification to registered applications whenever the configuration changes You can choose to have the notifications sent to the syslog Only CLI or HTTP changes are logged How to Use the CLI to Configure Features Configuring the Command History The software provides a history or record of commands that you have entered The command history feature is particularly useful for recalling long or complex commands or entries including access lists You can customize this feature to suit your needs OL 29440 01 Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 Bi Using the Command Line Interface A Configuring the Command History Changing the Command History Buffer Size By default the switch records ten command lines in its history buffer You can alter this number for a current terminal session or for all sessions on a particular line This procedure is optional SUMMARY STEPS 1 terminal history size number of lines DETAILED STEPS Command or Action Purpose Step 1 terminal history size number of lines Changes the number of command lines that the switch records during the current terminal session in the privileged EXEC mode You can Example configure the size from 0 through 256 Switch terminal history size 200 Recalling Commands To recall commands from the history buffer perform one of the act
143. n one of these modes In trusted mode all traffic received through the access port on the Cisco IP Phone passes through the phone unchanged OL 29440 01 Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 E Configuring Voice VLANs Voice VLAN Configuration Guidelines e In untrusted mode all traffic in IEEE 802 1Q or IEEE 802 1p frames received through the access port on the Cisco IP Phone receive a configured Layer 2 CoS value The default Layer 2 CoS value is 0 Untrusted mode is the default amp Note Untagged traffic from the device attached to the Cisco IP Phone passes through the phone unchanged regardless of the trust state of the access port on the phone Related Topics Configuring the Priority of Incoming Data Frames on page 155 Example Configuring a Port Connected to an IP Phone Not to Change Frame Priority on page 158 Voice VLAN Configuration Guidelines e Because a Cisco 7960 IP Phone also supports a connection to a PC or other device a port connecting the switch to a Cisco IP Phone can carry mixed traffic You can configure a port to decide how the Cisco IP Phone carries voice traffic and data traffic e The voice VLAN should be present and active on the switch for the IP phone to correctly communicate on the voice VLAN Use the show vlan privileged EXEC command to see ifthe VLAN is present listed in the display If the VLAN is not listed create the voice V
144. nd to verify the configuration Switch Switch Switch Switch Switch Switch config interface gigabitethernet1 0 11 config if l2protocol tunnel cdp config 1f 12protocol tunnel stp config if 12protocol tunnel vtp config if 12protocol tunnel shutdown threshold 1500 config if 12protocol tunnel drop threshold 1000 Switch config if exit Switch config 1l2protocol tunnel cos 7 Switch config end Switch show 12protocol COS for Encapsulated Packets 7 Port Protocol Shutdown Drop Encapsulation Decapsulation Drop Threshold Threshold Counter Counter Counter Gi0 11 cdp 1500 1000 2288 2282 0 stp 1500 1000 116 13 0 vtp 1500 1000 3 67 0 pagp S 0 0 0 lacp SFe SEBE 000 udld 00 0 Related Topics Configuring Layer 2 Protocol Tunneling on page 135 Layer 2 Protocol Tunneling on Ports on page 131 Layer 2 Protocol Tunneling on page 122 Layer 2 Tunneling for EtherChannels on page 124 OL 29440 01 Configuring IEEE 802 10 and Layer 2 Protocol Tunneling Examples Configuring the SP Edge and Customer Switches Examples Configuring the SP Edge and Customer Switches This example shows how to configure the SP edge switch 1 and edge switch 2 VLANs 17 18 19 and 20 are the access VLANs Fast Ethernet interfaces 1 and 2 are point to point tunnel ports with PA gP and UDLD enabled the drop threshold is 1000 and Fast Ethernet interface 3 is a trunk port SP edge switch c
145. nected to the customer switch perform the tunneling process You can enable Layer 2 protocol tunneling on ports that are configured as access ports or tunnel ports You cannot enable Layer 2 protocol tunneling on ports configured in either switchport mode dynamic auto mode the default mode or switchport mode dynamic desirable mode The switch supports Layer 2 protocol tunneling for CDP STP and VTP For emulated point to point network topologies it also supports PAgP LACP and UDLD protocols The switch does not support Layer 2 protocol tunneling for LLDP Note PAgP LACP and UDLD protocol tunneling is only intended to emulate a point to point topology An erroneous configuration that sends tunneled packets to many ports could lead to a network failure When the Layer 2 PDUs that entered the service provider inbound edge switch through a Layer 2 protocol enabled port exit through the trunk port into the service provider network the switch overwrites the customer PDU destination MAC address with a well known Cisco proprietary multicast address 01 00 0c cd cd d0 If IEEE 802 1Q tunneling is enabled packets are also double tagged the outer tag is the customer metro tag and the inner tag is the customer s VLAN tag The core switches ignore the inner tags and forward the packet to all trunk ports in the same metro VLAN The edge switches on the outbound side restore the proper Layer 2 protocol and MAC address information and forward th
146. nel and access ports in the same metro VLAN e For interoperability with third party vendor switches the switch supports a Layer 2 protocol tunnel bypass feature Bypass mode transparently forwards control PDUs to vendor switches that have different ways of controlling protocol tunneling When Layer 2 protocol tunneling is enabled on ingress ports on a switch egress trunk ports forward the tunneled packets with a special encapsulation If you also enable Layer 2 protocol tunneling on the egress trunk port this behavior is bypassed and the switch forwards control PDUs without any processing or modification The switch supports PAgP LACP and UDLD tunneling for emulated point to point network topologies Protocol tunneling is disabled by default but can be enabled for the individual protocols on IEEE 802 1Q tunnel ports or on access ports If you enable PAgP or LACP tunneling we recommend that you also enable UDLD on the interface for faster link failure detection e Loopback detection is not supported on Layer 2 protocol tunneling of PAgP LACP or UDLD packets e EtherChannel port groups are compatible with tunnel ports when the IEEE 802 1Q configuration is consistent within an EtherChannel port group e If an encapsulated PDU with the proprietary destination MAC address is received from a tunnel port or an access port with Layer 2 tunneling enabled the tunnel port is shut down to prevent loops The port also shuts down when a conf
147. nfig if mls qos trust cos Switch config if switchport voice vlan dotip Switch config if end To return the port to its default setting use the no switchport voice vlan interface configuration command OL 29440 01 Catalyst 2960 XR Switch VLAN Configuration Guide Cisco IOS Release 15 0 2 EX1 E Configuring Voice VLANs Example Configuring a Port Connected to an IP Phone Not to Change Frame Priority This example shows how to enable switch port voice detect on a Cisco IP Phone Switch configure terminal Enter configuration commands one per line End with CNTL Z Switch config interface gigabitethernet 1 0 1 Switch config if switchport voice detect detection enhancement keyword vlan VLAN for voice traffic Switch config if switchport voice detect cisco phone Cisco IP Phone Switch config if switchport voice detect cisco phone full duplex Cisco IP Phone Switch config if switchport voice detect cisco phone full duplex full duplex full duplex keyword Switch config if end This example shows how to disable switchport voice detect on a Cisco IP Phone Switch configure terminal Enter configuration commands one per line End with CNTL Z Switch config interface gigabitethernet 1 0 1 Switch config if no switchport voice detect cisco phone Switch config if no switchport voice detect cisco phone full duplex Related Topics Configuring Cisco IP Phone Voice Traffic on
148. nfiguration you need to save the VTP transparent mode configuration and private VLAN configuration in the switch startup configuration file Switch copy running config startup config Otherwise if the switch resets it defaults to VTP server mode which does not support private VLANs Related Topics Private VLAN Domains on page 87 Example Configuring a Primary VLAN Isolated VLAN and a Community of VLANs on page 102 Configuring a Layer 2 Interface as a Private VLAN Host Port Beginning in privileged EXEC mode follow these steps to configure a Layer 2 interface as a private VLAN host port and to associate it with primary and secondary VLANs X Note Isolated and community VLANs are both secondary VLANs SUMMARY STEPS DETAILED STEPS configure terminal interface interface id switchport mode private vlan host end show interfaces interface id switchport sO oF Wh copy running config startup config Command or Action switchport private vlan host association primary_vlan_id secondary_vlan_id Purpose Step 1 configure terminal Example Switch configure terminal Enters global configuration mode E Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 OL 29440 01 Configuring Private VLANs Configuring a Layer 2 Interface as a Private VLAN Host Port Command or Action Purpose Step 2 interface interface id Exa
149. nfiguration are the only parameters you can change See the description of the vlan global configuration command in the command reference for the default settings of all parameters In VTP version 1 or 2 if you enter an extended range VLAN ID when the switch is not in VTP transparent mode an error message is generated when you exit VLAN configuration mode and the extended range VLAN is not created In VTP version 1 and 2 extended range VLANs are not saved in the VLAN database they are saved in the switch running configuration file You can save the extended range VLAN configuration in the switch startup configuration file by using the copy running config startup config privileged EXEC command VTP version 3 saves extended range VLANs in the VLAN database Note SUMMARY STEPS Before you create an extended range VLAN you can verify that the VLAN ID is not used internally by entering the show vlan internal usage privileged EXEC command If the VLAN ID is used internally and you want to free it up go to the Creating an Extended Range VLAN with an Internal VLAN ID before creating the extended range VLAN configure terminal vtp mode transparent vlan vlan id mtu mtu size remote span end show vlan id vlan id ae A a a a copy running config startup config E Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 OL 29440 01 Configuring VLANs How to Configure Extended Range VLANs DETAI
150. nfiguration status and clear commands which clear counters or interfaces The user EXEC commands are not saved when the switch reboots To have access to all commands you must enter privileged EXEC mode Normally you must enter a password to enter privileged EXEC mode From this mode you can enter any privileged EXEC command or enter global configuration mode Using the configuration modes global interface and line you can make changes to the running configuration If you save the configuration these commands are stored and used when the switch reboots To access the various configuration modes you must start at global configuration mode From global configuration mode you can enter interface configuration mode and line configuration mode This table describes the main command modes how to access each one the prompt you see in that mode and how to exit the mode Catalyst 2960 XR Switch VLAN Configuration Guide Cisco IOS Release 15 0 2 EX1 OL 29440 01 Using the Command Line Interface Command Modes Table 1 Command Mode Summary Mode Access Method Prompt Exit Method About This Mode User EXEC Begin a session Enter logout or Use this mode to Switch gt 3 using Telnet SSH quit or console e Change terminal settings e Perform basic tests e Display system information Privileged EXEC While in user EXEC Enter disable to Use this mode to Switch i mode enter the exit v
151. nfiguring IEEE 802 10 and Layer 2 Protocol Tunneling Configuring Layer 2 Protocol Tunneling DETAILED STEPS Command or Action Purpose Step 1 configure terminal Enters the global configuration mode Example Switch configure terminal Step 2 interface interface id Specifies the interface connected to the phone and enters interface configuration mode Example Switch config interface gigabitethernet1 0 1 Step 3 Use one of the following Configures the interface as an access port or an IEEE 802 1Q tunnel port e switchport mode access e switchport mode dot1q tunnel Example Switch switchport mode access or Switch switchport mode dotlq tunnel Step 4 12protocol tunnel cdp lldp point to point Enables protocol tunneling for the desired protocol If no keyword is stp vtp entered tunneling is enabled for all three Layer 2 protocols Note Use the no 12protocol tunnel cdp lldp point to point stp Example vtp interface configuration command to disable protocol Switch l2protocol tunnel cdp tunneling for one of the Layer 2 protocols or for all three Step 5 I2protocol tunnel shutdown threshold Optional Configures the threshold for packets per second accepted for E Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 packet_second_rate_value cdp Ildp point to point stp vtp Example Switch 12protocol tunnel shutdown threshold 100 cdp encapsulation The
152. ng the SP Edge and Customer Switches on page 145 Configuration Examples for IEEE 802 10 and Layer 2 Protocol Tunneling Example Configuring an IEEE 802 10 Tunneling Port The following example shows how to configure an interface as a tunnel port enable tagging of native VLAN packets and verify the configuration In this configuration the VLAN ID for the customer connected to Gigabit Ethernet interface 7 on stack member is VLAN 22 Switch config interface gigabitethernet1 0 7 OL 29440 01 Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 E Configuring IEEE 802 10 and Layer 2 Protocol Tunneling Example Configuring Layer 2 Protocol Tunneling Switch config if switchport access vlan 22 Access VLAN does not exist Creating vlan 22 Switch config if switchport mode dotlq tunnel Switch config if exit Switch config vlan dotlq tag native Switch config end Switch show dotlq tunnel interface gigabitethernet1 0 7 Port Switch show vlan dotlq tag native dotlq native vlan tagging is enabled Related Topics Configuring an IEEE 802 1Q Tunneling Port on page 133 IEEE 802 1Q Tunneling on page 124 IEEE 802 1Q Tunneling and Incompatibilities on page 122 Example Configuring Layer 2 Protocol Tunneling E Catalyst 2960 XR Switch VLAN Configuration Guide Cisco IOS Release 15 0 2 EX1 The following example shows how to configure Layer 2 protocol tunneling for CDP STP and VTP a
153. nge VLANs However the number of routed ports SVIs and other configured features affects the use of the switch hardware The switch supports per VLAN spanning tree plus PVST or rapid PVST with a maximum of 128 spanning tree instances One spanning tree instance is allowed per VLAN The switch supports IEEE 802 1Q trunking methods for sending VLAN traffic over Ethernet ports VLAN Port Membership Modes You configure a port to belong to a VLAN by assigning a membership mode that specifies the kind of traffic the port carries and the number of VLANs to which it can belong When a port belongs to a VLAN the switch learns and manages the addresses associated with the port on a per VLAN basis Table 7 Port Membership Modes and Characteristics Membership Mode Static access VLAN Membership Characteristics A static access port can belong to one VLAN and is manually assigned to that VLAN VTP Characteristics VTP is not required If you do not want VTP to globally propagate information set the VTP mode to transparent To participate in VTP there must be at least one trunk port on the switch or the switch stack connected to a trunk port of a second switch or switch stack OL 29440 01 Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 i Configuring VLANs Normal Range VLAN Overview Membership Mode VLAN Membership Characteristics VTP Characteristics Tr
154. nity VLAN and with promiscuous ports These interfaces are isolated at Layer 2 from all other interfaces in other communities and from isolated ports within their private VLAN N Note Trunk ports carry traffic from regular VLANs and also from primary isolated and community VLANs Primary and secondary VLANs have these characteristics e Primary VLAN A private VLAN has only one primary VLAN Every port in a private VLAN is a member of the primary VLAN The primary VLAN carries unidirectional traffic downstream from the promiscuous ports to the isolated and community host ports and to other promiscuous ports e Isolated VLAN A private VLAN has only one isolated VLAN An isolated VLAN is a secondary VLAN that carries unidirectional traffic upstream from the hosts toward the promiscuous ports and the gateway Community VLAN A community VLAN is a secondary VLAN that carries upstream traffic from the community ports to the promiscuous port gateways and to other host ports in the same community You can configure multiple community VLANs in a private VLAN A promiscuous port can serve only one primary VLAN one isolated VLAN and multiple community VLANs Layer 3 gateways are typically connected to the switch through a promiscuous port With a promiscuous port you can connect a wide range of devices as access points to a private VLAN For example you can use a promiscuous port to monitor or back up all the private VLAN servers fro
155. nning config interface Step 9 show vlan dotlq tag native Displays IEEE 802 1Q native VLAN tagging status Example Switch show vlan dotlq native E Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 OL 29440 01 Configuring IEEE 802 10 and Layer 2 Protocol Tunneling Configuring Layer 2 Protocol Tunneling i Command or Action Purpose Step 10 copy running config startup config Optional Saves your entries in the configuration file Example Switch copy running config startup config Related Topics IEEE 802 1Q Tunneling on page 124 IEEE 802 1Q Tunneling and Incompatibilities on page 122 Example Configuring an IEEE 802 1Q Tunneling Port on page 143 Configuring Layer 2 Protocol Tunneling SUMMARY STEPS 1 configure terminal 2 interface interface id 3 Use one of the following e switchport mode access e switchport mode dotlq tunnel 4 12protocol tunnel cdp Ildp point to point stp vtp 51 2protocol tunnel shutdown threshold packet_second_rate_value cdp lldp point to point stp vtp I2protocol tunnel drop threshold packet_second_rate_value cdp lldp point to point stp vtp exit errdisable recovery cause l2ptguard coon o 2protocol tunnel cos value 10 end 11 show I2protocol 12 copy running config startup config Catalyst 2960 XR Switch VLAN Configuration Guide Cisco IOS Release 15 0 2 EX1 OL 29440 01 Co
156. o a trunk link if the Switch config if switchport mode neighboring interface is set to trunk or desirable mode This is dynamic desirable the default e dynamic desirable Sets the interface to a trunk link if the neighboring interface is set to trunk desirable or auto mode e trunk Sets the interface in permanent trunking mode and negotiate to convert the link to a trunk link even if the neighboring interface is not a trunk interface Step 4 switchport access vlan vian id Optional Specifies the default VLAN which is used if the interface stops trunking Example Switch config if switchport access vlan 200 Step 5 switchport trunk native vlan vian id Specifies the native VLAN for IEEE 802 1Q trunks Example Switch config if switchport trunk native vlan 200 Step 6 end Returns to privileged EXEC mode Example Switch config end E Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 OL 29440 01 Configuring VLAN Trunks Configuring an Ethernet Interface as a Trunk Port i Command or Action Purpose Step 7 show interfaces interface id switchport Displays the switch port configuration of the interface in the Administrative Mode and the Administrative Trunking Encapsulation Example fields of the display Switch show interfaces gigabitethernet1 0 2 switchport Step 8 show interfaces interface id trunk Displays the trunk configuration of the interface Example Sw
157. oes not support DTP use the switchport mode trunk and switchport nonegotiate interface configuration commands to cause the interface to become a trunk but to not Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 OL 29440 01 Configuring VLAN Trunks Layer 2 Interface Modes i generate DTP frames Use theswitchport trunk encapsulation dot1q interface to select the encapsulation type on the trunk port You can also specify on DTP interfaces whether the trunk uses IEEE 802 1Q encapsulation or if the encapsulation type is autonegotiated The DTP supports autonegotiation of IEEE 802 1Q trunks Layer 2 Interface Modes Table 10 Layer 2 Interface Modes Mode Function switchport mode access Puts the interface access port into permanent nontrunking mode and negotiates to convert the link into a nontrunk link The interface becomes a nontrunk interface regardless of whether or not the neighboring interface is a trunk interface switchport mode dynamic auto Makes the interface able to convert the link to a trunk link The interface becomes a trunk interface if the neighboring interface is set to trunk or desirable mode The default switchport mode for all Ethernet interfaces is dynamic auto switchport mode dynamic desirable Makes the interface actively attempt to convert the link to a trunk link The interface becomes a trunk interface if the neighboring interface is set to trunk desirabl
158. on from the VTP server and VTP domain With VTP version 3 the VLAN information is not erased You can use the vtp mode transparent global configuration command to disable VTP on the switch and then to change its VLAN information without affecting the other switches in the VTP domain SUMMARY STEPS show vtp status configure terminal vtp domain domain name end show vtp status configure terminal vtp domain domain name end seo NO OT FWD gt show vtp status Catalyst 2960 XR Switch VLAN Configuration Guide Cisco IOS Release 15 0 2 EX1 OL 29440 01 Configuring VTP Adding a VTP Client Switch to a VTP Domain DETAILED STEPS Command or Action Purpose Step 1 show vtp status Checks the VTP configuration revision number If the number is 0 add the switch to the VTP domain Example If the number is greater than 0 follow these sub steps Switch show vtp status g e Write down the domain name e Write down the configuration revision number e Continue with the next steps to reset the switch configuration revision number Step 2 configure terminal Enters the global configuration mode Example Switch configure terminal Step 3 vtp domain domain name Changes the domain name from the original one displayed in Step 1 to anew name Example Switch config vtp domain domain123 Step 4 end Returns to privileged EXEC mode The VLAN information on the switch is updated and the configuration revision number
159. on the Cisco IP Phone The PC can generate packets with an assigned CoS value You can configure the phone to not change trust or to override not trust the priority of frames arriving on the phone port from connected devices Follow these steps to set the priority of data traffic received from the non voice port on the Cisco IP Phone SUMMARY STEPS configure terminal interface interface id end eo FwWDy gt DETAILED STEPS copy running config startup config switchport priority extend cos value trust show interfaces interface id switchport Command or Action Purpose Step 1 configure terminal Enters the global configuration mode Example Switch configure terminal Step 2 interface interface id Specifies the interface connected to the Cisco IP Phone and enters interface configuration mode Example Switch config interface gigabitethernet1 0 1 Step 3 switchport priority extend cos value trust Sets the priority of data traffic received from the Cisco IP Phone Example Switch config if switchport priority extend trust access port cos value Configures the phone to override the priority received from the PC or the attached device with the specified CoS value The value is a number from 0 to 7 with 7 as the highest priority The default priority is cos 0 e trust Configures the phone access port to trust the priority received from the PC or the attached device Note To r
160. on the interface that value is used to set the BPDU CoS value for Layer 2 protocol tunneling If no CoS value is configured at the interface level the default value for CoS marking of L2 protocol tunneling BPDUs is 5 This does not apply to data traffic OL 29440 01 Configuring IEEE 802 10 and Layer 2 Protocol Tunneling How to Configure Tunneling How to Configure Tunneling i Configuring an IEEE 802 10 Tunneling Port SUMMARY STEPS 1 configure terminal 2 interface interface id 3 switchport access vlan vian id 4 switchport mode dotlq tunnel 5 exit 6 vlan dotlq tag native 7 end 8 Use one of the following e show dotlq tunnel e show running config interface 9 show vlan dotlq tag native 10 copy running config startup config DETAILED STEPS Command or Action Purpose Step 1 configure terminal Enters the global configuration mode Example Switch configure terminal Step 2 interface interface id Enters interface configuration mode for the interface to be configured as a tunnel port This should be the edge port in the Example service provider network that connects to the customer switch Valid interfaces include physical interfaces and port channel logical Switch config interface interfaces port channels 1 to 48 gigabitethernet2 0 1 Step 3 switchport access vlan vlan id Specifies the default VLAN which is used if the interface stops trunking This VLAN ID is specific to the particu
161. one spanning tree instance for all VLANs When you connect a Cisco switch to a non Cisco device through an IEEE 802 1Q trunk the Cisco switch combines the spanning tree instance of the VLAN of the trunk with the spanning tree instance of the non Cisco IEEE 802 1Q switch However spanning tree information for each VLAN is maintained by Catalyst 2960 XR Switch VLAN Configuration Guide Cisco IOS Release 15 0 2 EX1 OL 29440 01 Configuring VLAN Trunks A Restrictions for VLAN Trunks Cisco switches separated by a cloud of non Cisco IEEE 802 1Q switches The non Cisco IEEE 802 1Q cloud separating the Cisco switches is treated as a single trunk link between the switches e Make sure the native VLAN for an IEEE 802 1Q trunk is the same on both ends of the trunk link If the native VLAN on one end ofthe trunk is different from the native VLAN on the other end spanning tree loops might result Disabling spanning tree on the native VLAN of an IEEE 802 1Q trunk without disabling spanning tree on every VLAN in the network can potentially cause spanning tree loops We recommend that you leave spanning tree enabled on the native VLAN of an IEEE 802 1Q trunk or disable spanning tree on every VLAN in the network Make sure your network is loop free before disabling spanning tree Restrictions for VLAN Trunks Dynamic Trunking Protocol DTP is not supported on private VLAN ports or tunnel ports The switch does not support Layer 3 trunks
162. onfiguration Switc Switc Switc Switc Switc Switc Switc Switc Switc Switc Switc Switc Switc Switc Switc Switc Switc h h h h h h h h h c h h h h h h h h config interface gigabitethernet1 0 1 config if config if config if config if config if config if config i config if config if config if config if config if config if config i config if config if switchport access vlan 17 switchport mode dotlq tunnel 12protocol tunnel point to point 12protocol tunnel point to point 12protocol tunnel drop threshold exit nterface gigabitethernet1 0 2 switchport access vlan 18 switchport mode dotlq tunnel 12protocol tunnel point to point 12protocol tunnel point to point 12protocol tunnel drop threshold exit nterface gigabitethernet1 0 3 pagp udld point to point pagp 1000 pagp udld point to point pagp 1000 switchport trunk encapsulation isl switchport mode trunk SP edge switch 2 configuration Switc Switc Switc Switc Switc Switc Switc Switc Switc Switc Switc Switc Switc Switc Switc Switc Switc h h h h h h h h c h h h h h h h h h config interface gigabitethernet1 0 1 config if config if config if config if config if config if onfig i config if config if config if config if config if config if config i config if config if
163. onfiguring 111 dynamic port membership 109 114 116 described 109 reconfirming 114 troubleshooting 116 dynamic port VLAN membership 109 111 113 114 116 described 109 reconfirming 113 114 troubleshooting 116 types of connections 111 dynamic VLAN assignments 108 E entering server address 110 Ethernet VLAN 47 extended range VLAN 52 54 extended range VLAN configuration guidelines 45 extended range VLANs 52 F feature information 37 82 160 VLAN trunks 82 voice VLAN 160 VTP 37 H hosts limit on dynamic ports 116 IEEE 802 1Q 124 protocol 124 IEEE 802 1Q tagging 72 IEEE 802 1Q tunneling 124 IEEE 802 1Q Tunneling 129 default 129 internal VLAN ID 54 L Layer 2 124 protocol 124 Layer 2 interface modes 63 Layer 2 Protocol Tunneling 129 131 132 default 132 Layer 2 Tunneling 124 EtherChannels 124 load sharing 64 73 77 trunk ports 64 OL 29440 01 Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 E Index mapping VLANs 103 monitoring 34 101 146 157 private VLAN 101 tunneling status 146 voice VLAN 157 VTP 34 monitoring private VLANs 104 MST mode 66 native VLAN 72 Native VLANs 127 Network Load Sharing 64 65 STP path cost 65 STP priorities 64 normal range 44 VLAN configuration guidelines 44 Normal range VLANs 42 P password 21 35 ports 88 community 88 isolated 88 promiscuous 88 prerequisites 13 39 61 83 107 121 149 private VLANs 83 tunn
164. ous port and map it to primary and secondary VLANs Note Isolated and community VLANs are both secondary VLANs SUMMARY STEPS 1 configure terminal 2 interface interface id 3 switchport mode private vlan promiscuous 4 switchport private vlan mapping primary_vilan_id add remove secondary_vlan_list 5 end 6 show interfaces interface id switchport 7 copy running config startup config DETAILED STEPS Command or Action Purpose Step 1 configure terminal Enters global configuration mode Example Switch configure terminal Step 2 interface interface id Enters interface configuration mode for the Layer 2 interface to be configured Example Switch config interface gigabitethernet1 0 2 Step 3 switchport mode private vlan promiscuous Configures the Layer 2 port as a private VLAN promiscuous port Example Switch config if switchport mode private vlan promiscuous Step 4 switchport private vlan mapping primary _vlan_id Maps the private VLAN promiscuous port to a primary VLAN add remove secondary_vlan_list and to selected secondary VLANs The secondary_vilan_list parameter cannot contain spaces It can Example contain multiple comma separated items Each item can be a Switch config if switchport private vlan Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 OL 29440 01 Configuring Private VLANs Mapping Secondary VLANs to a Primary VLAN Layer 3
165. p 1 configure terminal Enters the global configuration mode Example Switch configure terminal Step 2 vtp pruning Enables pruning in the VTP administrative domain By default pruning is disabled You need to enable pruning on only Example one switch in VTP server mode Switch config vtp pruning Note To disable VTP pruning use the no vtp pruning global configuration command Step 3 end Returns to privileged EXEC mode Example Switch config end Step 4 show vtp status Verifies your entries in the VTP Pruning Mode field of the display Example Switch show vtp status E Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 OL 29440 01 Configuring VTP Related Topics VTP Pruning on page 18 Configuring VTP on a Per Port Basis Configuring VTP on a Per Port Basis With VTP version 3 you can enable or disable VTP on a per port basis You can enable VTP only on ports that are in trunk mode Incoming and outgoing VTP traffic are blocked not forwarded SUMMARY STEPS 1 configure terminal 2 interface interface id 3 vtp 4 end 5 show running config interface interface id 6 show vtp status DETAILED STEPS Command or Action Purpose Step 1 configure terminal Enters the global configuration mode Example Switch configure terminal Step 2 interface interface id Identifies an interface and enters interface configuration mode Example Switch config int
166. parent mode when you create extended range VLANs VTP version 3 also supports creating extended range VLANs in client or server mode In VTP versions 1 and 2 the switch must be in VTP transparent mode when you create private VLANs and when they are configured you should not change the VTP mode from transparent to client or server mode VTP version 3 also supports private VLANs in client and server modes When private VLANs are configured do not change the VTP mode from transparent to client or server mode When the switch is in VTP transparent mode the VTP and VLAN configurations are saved in NVRAM but they are not advertised to other switches In this mode VTP mode and domain name are saved in the switch running configuration and you can save this information in the switch startup configuration file by using the copy running config startup config privileged EXEC command In a switch stack the running configuration and the saved configuration are the same for all switches in a stack VTP off Related Topics A switch in VTP off mode functions in the same manner as a VTP transparent switch except that it does not forward VTP advertisements on trunks Configuring VTP Mode on page 24 Example Configuring the Switch as a VTP Server on page 35 VTP Advertisements Each switch in the VTP domain sends periodic global configuration advertisements from each trunk port to a reserved multicast address Neighboring switches re
167. ps reconfirm global configuration command Step 3 end Returns to privileged EXEC mode Example Switch config end Step 4 show vmps Verifies the dynamic VLAN reconfirmation status in the Reconfirm Interval field of the display Example Switch show vmps Step 5 copy running config startup config Optional Saves your entries in the configuration file Example Switch copy running config startup config Changing the Retry Count Beginning in privileged EXEC mode follow these steps to change the number of times that the switch attempts to contact the VMPS before querying the next server SUMMARY STEPS configure terminal vmps retry count end show vmps go a UNa copy running config startup config OL 29440 01 Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 Configuring VMPS a Troubleshooting Dynamic Access Port VLAN Membership DETAILED STEPS Command or Action Purpose Step 1 configure terminal Enters the global configuration mode Example Switch configure terminal Step 2 vmps retry count Changes the retry count The retry range is 1 to 10 the default is 3 Example Note To return the switch to its default setting use the no Switch config vmps retry 5 vmps retry global configuration command Step 3 end Returns to privileged EXEC mode Example Switch config end Step 4 show vmps Verifies your entry in the Server Retry Count field of the d
168. r dial up modem or connect the Ethernet management port to a PC For information about connecting to the console or Ethernet management port see the switch hardware installation guide e Use any Telnet TCP IP or encrypted Secure Shell SSH package from a remote management station The switch must have network connectivity with the Telnet or SSH client and the switch must have an enable secret password configured e The switch supports up to 16 simultaneous Telnet sessions Changes made by one Telnet user are reflected in all other Telnet sessions The switch supports up to five simultaneous secure SSH sessions After you connect through the console port through the Ethernet management port through a Telnet session or through an SSH session the user EXEC prompt appears on the management station Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 OL 29440 01 Using the Command Line Interface a Accessing the CLI through a Console Connection or through Telnet Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 OL 29440 01 CHAPTER 2 Configuring VTP e Finding Feature Information page 13 e Prerequisites for VTP page 13 Information About VTP page 14 Default VTP Configuration page 23 e How to Configure VTP page 24 Monitoring VTP page 34 e Configuration Examples for VTP page 35 e Where to Go Next page 36 Additional References page 36 e Featu
169. re This is the default OL 29440 01 Catalyst 2960 XR Switch VLAN Configuration Guide Cisco IOS Release 15 0 2 EX1 E Configuring VTP Enabling the VTP Version Command or Action Purpose e Optional mst Selects the multiple spanning tree MST database as the takeover feature e Optional foree Overwrites the configuration of any conflicting servers If you do not enter force you are prompted for confirmation before the takeover Related Topics Example Configuring a VTP Version 3 Primary Server on page 35 Enabling the VTP Version VTP version 2 and version 3 are disabled by default e When you enable VTP version 2 on a switch every VTP version 2 capable switch in the VTP domain enables version 2 To enable VTP version 3 you must manually configure it on each switch e With VTP versions 1 and 2 you can configure the version only on switches in VTP server or transparent mode If a switch is running VTP version 3 you can change to version 2 when the switch is in client mode if no extended VLANs exist no private VLANs exist and no hidden password was configured A Caution VTP version 1 and VTP version 2 are not interoperable on switches in the same VTP domain Do not enable VTP version 2 unless every switch in the VTP domain supports version 2 In TrCRF and TrBRF Token Ring environments you must enable VTP version 2 or VTP version 3 for Token Ring VLAN switching to function p
170. re History and Information for VTP page 37 Finding Feature Information Your software release may not support all the features documented in this module For the latest feature information and caveats see the release notes for your platform and software release Use Cisco Feature Navigator to find information about platform support and Cisco software image support To access Cisco Feature Navigator go to http www cisco com go cfn An account on Cisco com is not required Prerequisites for VTP The following are prerequisites for VTP e Before you create VLANs you must decide whether to use the VLAN Trunking Protocol VTP in your network Using VTP you can make configuration changes centrally on one or more switches and have those changes automatically communicated to all the other switches in the network Without VTP you cannot send information about VLANs to other switches VTP is designed to work in an environment where updates are made on a single switch and are sent through VTP to other switches in the domain Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 OL 29440 01 Configuring VTP A Information About VTP It does not work well in a situation where multiple updates to the VLAN database occur simultaneously on switches in the same domain which would result in an inconsistency in the VLAN database The switch supports 1005 VLANs when running the IP Lite image e However the n
171. roperly For Token Ring and Token Ring Net media disable VTP version 2 A Caution In VTP version 3 both the primary and secondary servers can exist on an instance in the domain SUMMARY STEPS configure terminal vtp version 1 2 3 end show vtp status oF WN gt copy running config startup config Catalyst 2960 XR Switch VLAN Configuration Guide Cisco IOS Release 15 0 2 EX1 OL 29440 01 Configuring VTP DETAILED STEPS Enabling VTP Pruning i Command or Action Purpose Step 1 configure terminal Example Switch configure terminal Enters the global configuration mode Step 2 vtp version 1 2 3 Example Switch config vtp version 2 Enables the VTP version on the switch The default is VTP version 1 Note To return to the default VTP version 1 use the no vtp version global configuration command Step 3 end Example Switch config end Step 4 show vtp status Returns to privileged EXEC mode Verifies that the configured VTP version is enabled Example Switch show vtp status Step 5 copy running config startup config Optional Saves the configuration in the startup configuration Example Switch copy running config startup config file Related Topics VTP Version on page 22 Enabling VTP Pruning Pruning increases available bandwidth by restricting flooded traffic to those trunk links that the traffic must use to access th
172. rs Switch config vtp password mypassword hidden Generating the secret associated to the password Switch config end Switch show vtp password VTP password 89914640C8D90868B6A0D8103847A733 Related Topics Configuring a VTP Version 3 Password on page 26 Passwords for the VTP Domain on page 21 Example Configuring a VTP Version 3 Primary Server This example shows how to configure a switch as the primary server for the VLAN database the default when a hidden or secret password was configured Switch vtp primary vlan Enter VTP password mypassword This switch is becoming Primary server for vlan feature in the VIP domain VTP Database Conf Switch ID Primary Server Revision System Name OL 29440 01 Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 E Configuring VTP Example Configuring VTP on a Per Port Basis VLANDB Yes 00d0 00b8 1400 00d0 00b8 1400 1 stp7 Do you want to continue y n n y Related Topics Configuring a VTP Version 3 Primary Server on page 27 Example Configuring VTP on a Per Port Basis This example shows how to configure VTP on a per port basis Switch config interface gigabitethernet 1 0 1 Switch config if vtp Switch config if end Related Topics Configuring VTP on a Per Port Basis on page 31 Where to Go Next After configuring VTP you can configure the following e VLANs e VLAN trunking e Private VLANs e VLAN Membership Policy
173. rt all the features documented in this module For the latest feature information and caveats see the release notes for your platform and software release Use Cisco Feature Navigator to find information about platform support and Cisco software image support To access Cisco Feature Navigator go to http www cisco com go cfn An account on Cisco com is not required Prerequisites for Voice VLANs The following are the prerequisites for voice VLANs e Voice VLAN configuration is only supported on switch access ports voice VLAN configuration is not supported on trunk ports Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 OL 29440 01 Configuring Voice VLANs A Restrictions for Voice VLANs amp Note Trunk ports can carry any number of voice VLANs similar to regular VLANs The configuration of voice VLANs is not supported on trunk ports e Before you enable voice VLAN we recommend that you enable QoS on the switch by entering the mls qos global configuration command and configure the port trust state to trust by entering the mls qos trust cos interface configuration command If you use the auto QoS feature these settings are automatically configured e You must enable CDP on the switch port connected to the Cisco IP Phone to send the configuration to the phone CDP is globally enabled by default on all switch interfaces Restrictions for Voice VLANs The following are the restri
174. rt channels cannot be configured as dynamic access ports e A dynamic access port can participate in fallback bridging The VTP management domain of the VMPS client and the VMPS server must be the same The VLAN configured on the VMPS server should not be a voice VLAN Information About VMPS Dynamic VLAN Assignments The VLAN Query Protocol VQP is used to support dynamic access ports which are not permanently assigned to a VLAN but give VLAN assignments based on the MAC source addresses seen on the port Each time an unknown MAC address is seen the switch sends a VQP query to a remote VLAN Membership Policy Server VMPS the query includes the newly seen MAC address and the port on which it was seen The VMPS responds with a VLAN assignment for the port The switch cannot be a VMPS server but can act as a client to the VMPS and communicate with it through VQP Each time the client switch receives the MAC address of a new host it sends a VQP query to the VMPS When the VMPS receives this query it searches its database for a MAC address to VLAN mapping The server response is based on this mapping and whether or not the server is in open or secure mode In secure mode the server shuts down the port when an illegal host is detected In open mode the server denies the host access to the port If the port is currently unassigned that is it does not yet have a VLAN assignment the VMPS provides one of these responses e If the host
175. rts in that VLAN Private VLAN broadcast forwarding depends on the port sending the broadcast An isolated port sends a broadcast only to the promiscuous ports or trunk ports e A community port sends a broadcast to all promiscuous ports trunk ports and ports in the same community VLAN e A promiscuous port sends a broadcast to all ports in the private VLAN other promiscuous ports trunk ports isolated ports and community ports Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 OL 29440 01 Configuring Private VLANs A Private VLAN Configuration Tasks Multicast traffic is routed or bridged across private VLAN boundaries and within a single community VLAN Multicast traffic is not forwarded between ports in the same isolated VLAN or between ports in different secondary VLANS Private VLANs and SVIs In a Layer 3 switch a switch virtual interface SVT represents the Layer 3 interface of a VLAN Layer 3 devices communicate with a private VLAN only through the primary VLAN and not through secondary VLANs Configure Layer 3 VLAN interfaces SVIs only for primary VLANs You cannot configure Layer 3 VLAN interfaces for secondary VLANs SVIs for secondary VLANs are inactive while the VLAN is configured as a secondary VLAN e If you try to configure a VLAN with an active SVI as a secondary VLAN the configuration is not allowed until you disable the SVI e If you try to create an SVI on a VLAN
176. ry VLAN Isolated VLAN and a Community of VLANs on page 102 Secondary VLANs There are two types of secondary VLANs e Isolated VLANs Ports within an isolated VLAN cannot communicate with each other at the Layer 2 level Community VLANs Ports within a community VLAN can communicate with each other but cannot communicate with ports in other communities at the Layer 2 level Private VLANs Ports Private VLANs provide Layer 2 isolation between ports within the same private VLAN Private VLAN ports are access ports that are one of these types Catalyst 2960 XR Switch VLAN Configuration Guide Cisco IOS Release 15 0 2 EX1 88 OL 29440 01 Configuring Private VLANs Private VLANs in Networks i e Promiscuous A promiscuous port belongs to the primary VLAN and can communicate with all interfaces including the community and isolated host ports that belong to the secondary VLANs associated with the primary VLAN e Isolated An isolated port is a host port that belongs to an isolated secondary VLAN It has complete Layer 2 separation from other ports within the same private VLAN except for the promiscuous ports Private VLANs block all traffic to isolated ports except traffic from promiscuous ports Traffic received from an isolated port is forwarded only to promiscuous ports e Community A community port is a host port that belongs to a community secondary VLAN Community ports communicate with other ports in the same commu
177. s both load sharing links must be connected to the same switch For load sharing using STP path costs each load sharing link can be connected to the same switch or to two different switches Network Load Sharing Using STP Priorities When two ports on the same switch form a loop the switch uses the STP port priority to decide which port is enabled and which port is in a blocking state You can set the priorities on a parallel trunk port so that the port carries all the traffic for a given VLAN The trunk port with the higher priority lower values fora VLAN is forwarding traffic for that VLAN The trunk port with the lower priority higher values for the same VLAN remains in a blocking state for that VLAN One trunk port sends or receives all traffic for the VLAN This figure shows two trunks connecting supported switches e VLANs 8 through 10 are assigned a port priority of 16 on Trunk 1 e VLANs 3 through 6 retain the default port priority of 128 on Trunk 1 e VLANs 3 through 6 are assigned a port priority of 16 on Trunk 2 e VLANs 8 through 10 retain the default port priority of 128 on Trunk 2 Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 OL 29440 01 Configuring VLAN Trunks Load Sharing on Trunk Ports Figure 4 Load Sharing by Using STP Port Priorities Switch A Trunk 1 gt lt Trunk 2 VLANs 8 10 priority 16 VLANs 3 6 priority 16 VLANs 3 6 priority 128
178. s than or equal to the shutdown threshold value Note Use the no l2protocol tunnel shutdown threshold cdp ldp point to point stp vtp and the no 12protocol tunnel drop threshold cdp stp vtp commands to return the shutdown and drop thresholds to the default settings Step 7 exit Returns to global configuration mode Example Switch exit Step 8 errdisable recovery cause I2ptguard Optional Configures the recovery mechanism from a Layer 2 maximum rate error so that the interface is reenabled and can try again Example Errdisable recovery is disabled by default when enabled the default time interval is 300 seconds Switch config errdisable recovery cause 12ptguard Step 9 12protocol tunnel cos value Optional Configures the CoS value for all tunneled Layer 2 PDUs The range is 0 to 7 the default is the default CoS value for the interface If Example none is configured the default is 5 Switch config 1l2protocol tunnel cos value 7 Step 10 end Returns to privileged EXEC mode Example Switch config end Step 11 show 12protocol Displays the Layer 2 tunnel ports on the switch including the protocols configured the thresholds and the counters Example Switch show 12protocol Step 12 copy running config startup config Optional Saves your entries in the configuration file Example Switch copy running config OL 29440 01 Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Rele
179. sco IP Phone configured to use one VLAN for voice traffic and another VLAN for data traffic from a device attached to the phone VTP is not required it has no effect on a voice VLAN Normal range VLANs are VLANs with VLAN IDs to 1005 If the switch is in VTP server or VTP transparent mode you can add modify or remove configurations for VLANs 2 to 1001 in the VLAN database VLAN IDs 1 and 1002 to 1005 are automatically created and cannot be removed In VTP versions 1 and 2 the switch must be in VTP transparent mode when you create extended range VLANs VLANs with IDs from 1006 to 4094 but these VLANs are not saved in the VLAN database VTP version 3 supports extended range VLANs in VTP server and transparent mode Configurations for VLAN IDs to 1005 are written to the file vlan dat VLAN database and you can display them by entering the show vlan privileged EXEC command The vlan dat file is stored in flash memory On Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 OL 29440 01 Configuring VLANs VLAN Configuration Saving Process a switch the vlan dat file is stored in flash memory on the stack master Stack members have a vlan dat file that is consistent with the stack master Token Ring VLANs Although the switch does not support Token Ring connections a remote device such as a Catalyst 5000 series switch with Token Ring connections could be managed from one of t
180. se 15 0 2 EX1 OL 29440 01 Configuring VLANs How to Configure Extended Range VLANs Command or Action Purpose startup config switch resets it will default to VTP server mode and the extended range VLAN IDs will not be saved Note This step is not required for VTP version 3 because VLANs are saved in the VLAN database The procedure for assigning static access ports to an extended range VLAN is the same as for normal range VLANs Related Topics Extended Range VLAN Configuration Guidelines on page 45 Example Creating an Extended Range VLAN on page 57 Creating an Extended Range VLAN with an Internal VLAN ID If you enter an extended range VLAN ID that is already assigned to an internal VLAN an error message is generated and the extended range VLAN is rejected To manually free an internal VLAN ID you must temporarily shut down the routed port that is using the internal VLAN ID SUMMARY STEPS show vlan internal usage configure terminal interface interface id shutdown exit vtp mode transparent vlan vlan id exit cee NS FF wWhDY gt interface interface id 10 no shutdown 11 end 12 copy running config startup config Catalyst 2960 XR Switch VLAN Configuration Guide Cisco IOS Release 15 0 2 EX1 OL 29440 01 Configuring VLANs DETAILED STEPS Command or Action How to Configure Extended Range VLANs Purpose Step 1 show vlan internal usage Displays
181. ship Policy Server VMPS Tunneling e Voice VLANs Additional References Related Documents Related Topic Document Title For complete syntax and usage information for the commands used in this chapter Catalyst 2960 XR Switch VLAN Management Command Reference Standards and RFCs Standard RFC Title MIBs MIB MIBs Link All supported MIBs for this release To locate and download MIBs for selected platforms Cisco IOS releases and feature sets use Cisco MIB Locator found at the following URL http www cisco com go mibs E Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 OL 29440 01 Configuring VLANs Feature History and Information for VLAN i Technical Assistance Description Link The Cisco Support website provides extensive online http www cisco com support resources including documentation and tools for troubleshooting and resolving technical issues with Cisco products and technologies To receive security and technical information about your products you can subscribe to various services such as the Product Alert Tool accessed from Field Notices the Cisco Technical Services Newsletter and Really Simple Syndication RSS Feeds Access to most tools on the Cisco Support website requires a Cisco com user ID and password Feature History and Information for VLAN Cisco IOS 15 0 2 EX1
182. talyst 2960 XR Switch VLAN Configuration Guide Cisco IOS Release 15 0 2 EX1 OL 29440 01 Configuring VTP Configuring a VTP Version 3 Primary Server Command or Action Purpose Note To clear the password enter the no vtp password global configuration command Step 3 end Returns to privileged EXEC mode Example Switch config end Step 4 show vtp password Verifies your entries The output appears like this VTP password 89914640C8D90868B6A0D8 103847A733 Example Switch show vtp password Step 5 copy running config startup config Optional Saves the configuration in the startup configuration file Example Switch copy running config startup config Related Topics Passwords for the VTP Domain on page 21 Example Configuring a Hidden Password on page 35 Configuring a VTP Version 3 Primary Server When you configure a VTP server as a VTP primary server the takeover operation starts SUMMARY STEPS 1 vtp primary vlan mst DETAILED STEPS force Step1 vtp primary vlan mst force Command or Action Example Switch vtp primary vlan force primary Purpose Changes the operational state of a switch from a secondary server the default to a server and advertises the configuration to the domain If the switch password is configured as hidden you are prompted to reenter the password Optional vlan Selects the VLAN database as the takeover featu
183. terface configuration mode Example Switch config interface gigabitethernet1 0 1 Step 3 mls qos trust cos Configures the interface to classify incoming traffic packets by using the packet CoS value For untagged packets the port default CoS value Example is used Switch config if mls qos trust cos Note Before configuring the port trust state you must first globally enable QoS by using the mls qos global configuration command Step 4 switchport voice vlan v an id dot1p none Configures how the Cisco IP Phone carries voice traffic E Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 untagged Example Switch config if switchport voice vlan 125 e vlan id Configures the phone to forward all voice traffic through the specified VLAN By default the Cisco IP Phone forwards the voice traffic with an IEEE 802 1Q priority of 5 Valid VLAN IDs are 1 to 4094 e dotlp Configures the switch to accept voice and data IEEE 802 1p priority frames tagged with VLAN ID 0 the native VLAN By default the switch drops all voice and data traffic tagged with VLAN 0 If configured for 802 1p the Cisco IP Phone forwards the traffic with an IEEE 802 1p priority of 5 OL 29440 01 Configuring Voice VLANs Configuring the Priority of Incoming Data Frames i Command or Action Purpose none Allows the phone to use its own configuration to send untagged voice traffic unt
184. that are connected by an asymmetrical link or devices that communicate through a tunnel e Loopback detection is supported on IEEE 802 1Q tunnel ports e When a port is configured as an IEEE 802 1Q tunnel port spanning tree bridge protocol data unit BPDU filtering is automatically enabled on the interface Cisco Discovery Protocol CDP and the Layer Link Discovery Protocol LLDP are automatically disabled on the interface Related Topics Configuring an IEEE 802 1Q Tunneling Port on page 133 Example Configuring an IEEE 802 1Q Tunneling Port on page 143 Layer 2 Protocol Tunneling The following are configuration guidelines and operating characteristics of Layer 2 protocol tunneling The switch supports tunneling of CDP STP including multiple STP MSTP and VTP Protocol tunneling is disabled by default but can be enabled for the individual protocols on IEEE 802 1Q tunnel ports or access ports Catalyst 2960 XR Switch VLAN Configuration Guide Cisco IOS Release 15 0 2 EX1 OL 29440 01 Configuring IEEE 802 10 and Layer 2 Protocol Tunneling Layer 2 Protocol Tunneling i e The switch does not support Layer 2 protocol tunneling on ports with switchport mode dynamic auto or dynamic desirable DTP is not compatible with layer 2 protocol tunneling e The edge switches on the outbound side of the service provider network restore the proper Layer 2 protocol and MAC address information and forward the packets to all tun
185. that have version 2 enabled e Cisco recommends placing VTP version 1 and 2 switches at the edge of the network because they do not forward VTP version 3 advertisements If there are TrBRF and TrCRF Token Ring networks in your environment you must enable VTP version 2 or version 3 for Token Ring VLAN switching to function properly To run Token Ring and Token Ring Net disable VTP version 2 e VTP version and version 2 do not propagate configuration information for extended range VLANs VLANs 1006 to 4094 You must configure these VLANs manually on each device VTP version 3 supports extended range VLANs You cannot convert from VTP version 3 to VTP version 2 if extended VLANs are configured e When a VTP version 3 device trunk port receives messages from a VTP version 2 device it sends a scaled down version of the VLAN database on that particular trunk in VTP version 2 format A VTP version 3 device does not send VTP version 2 formatted packets on a trunk unless it first receives VTP version 2 packets on that trunk port e When a VTP version 3 device detects a VTP version 2 device on a trunk port it continues to send VTP version 3 packets in addition to VTP version 2 packets to allow both kinds of neighbors to coexist on the same trunk A VTP version 3 device does not accept configuration information from a VTP version 2 or version 1 device e Two VTP version 3 regions can only communicate in transparent mode over a VTP version
186. that is configured as a secondary VLAN and the secondary VLAN is already mapped at Layer 3 the SVI is not created and an error is returned If the SVI is not mapped at Layer 3 the SVI is created but it is automatically shut down When the primary VLAN is associated with and mapped to the secondary VLAN any configuration on the primary VLAN is propagated to the secondary VLAN SVIs For example if you assign an IP subnet to the primary VLAN SVI this subnet is the IP subnet address of the entire private VLAN Private VLANs and Switch Stacks Private VLANs can operate within the switch stack and private VLAN ports can reside on different stack members However some changes to the switch stack can impact private VLAN operation e If a stack contains only one private VLAN promiscuous port and the stack member that contains that port is removed from the stack host ports in that private VLAN lose connectivity outside the private VLAN e Ifa stack master stack that contains the only private VLAN promiscuous port in the stack fails or leaves the stack and a new stack master is elected host ports in a private VLAN that had its promiscuous port on the old stack master lose connectivity outside of the private VLAN e If two stacks merge private VLANs on the winning stack are not affected but private VLAN configuration on the losing switch is lost when that switch reboots Private VLAN Configuration Tasks To configure a private VLAN perform t
187. the VLAN IDs being used internally by the switch If the VLAN ID that you want to use is an internal VLAN the display Example shows the routed port that is using the VLAN ID Enter that port number in Step 3 Switch show vlan internal usage Step 2 configure terminal Enters global configuration mode Example Switch configure terminal Step 3 interface interface id Specifies the interface ID for the routed port that is using the VLAN ID and enters interface configuration mode Example Switch config interface gigabitethernet1 0 3 Step 4 shutdown Shuts down the port to free the internal VLAN ID Example Switch config if shutdown Step 5 exit Returns to global configuration mode Example Switch config if exit Step 6 vtp mode transparent Sets the VTP mode to transparent for creating extended range VLANs Note This step is not required for VTP version Example 3 Switch config vtp mode transparent Step 7 vlan vlan id Enters the new extended range VLAN ID and enters VLAN Example Switch config vlan vlan 2000 configuration mode OL 29440 01 Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 Configuring VLANs A Monitoring VLANs Command or Action Purpose Step 8 exit Exits from VLAN configuration mode and returns to global configuration mode Example Switch config vlan exit Step 9 interface interface id Specifies the interface ID for the route
188. the switch with the highest VTP configuration revision number If you add a switch that has a revision number higher than the revision number in the VTP domain it can erase all VLAN information from the VTP server and VTP domain When you make a change to the VLAN configuration on a VTP server the change is propagated to all switches in the VTP domain VTP advertisements are sent over all IEEE trunk connections including IEEE 802 1Q VTP dynamically maps VLANs with unique names and internal index associates across multiple LAN types Mapping eliminates excessive device administration required from network administrators If you configure a switch for VTP transparent mode you can create and modify VLANs but the changes are not sent to other switches in the domain and they affect only the individual switch However configuration changes made when the switch is in this mode are saved in the switch running configuration and can be saved to the switch startup configuration file Related Topics Adding a VTP Client Switch to a VTP Domain on page 32 Table 4 VTP Modes VTP Mode Description VTP server In VTP server mode you can create modify and delete VLANs and specify other configuration parameters such as the VTP version for the entire VTP domain VTP servers advertise their VLAN configurations to other switches in the same VTP domain and synchronize their VLAN configurations with other switches based on advertisements received
189. tion MVR e Voice VLAN e Web Cache Communication Protocol WCCP e You can configure IEEE 802 1x port based authentication on a private VLAN port but do not configure 802 1x with port security voice VLAN or per user ACL on private VLAN ports e A private VLAN host or promiscuous port cannot be a SPAN destination port If you configure a SPAN destination port as a private VLAN port the port becomes inactive e If you configure a static MAC address on a promiscuous port in the primary VLAN you must add the same static address to all associated secondary VLANs If you configure a static MAC address on a host port ina secondary VLAN you must add the same static MAC address to the associated primary VLAN When you delete a static MAC address from a private VLAN port you must remove all instances of the configured MAC address from the private VLAN Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 OL 29440 01 Configuring Private VLANs Information About Private VLANs AS Note Dynamic MAC addresses learned in one VLAN of a private VLAN are replicated in the associated VLANs For example a MAC address learned in a secondary VLAN is replicated in the primary VLAN When the original dynamic MAC address is deleted or aged out the replicated addresses are removed from the MAC address table e Configure Layer 3 VLAN interfaces SVIs only for primary VLANs Information About Private VLANs
190. to Switch config line gt configuration mode configuration mode configure specify a line with enter exit parameters for the the e vty or n aanta terminal line console command privileged EXEC mode press Ctrl Z or enter end You can enter a question mark at the system prompt to display a list of commands available for each command mode You can also obtain a list of associated keywords and arguments for any command help command eo FwWnN gt abbreviated command entry abbreviated command entry lt Tab gt command keyword Step 1 Command or Action Purpose Obtains a brief description of the help system in any help Example Switch help command mode Step 2 Example abbreviated command entry Switch di dir disable disconnect Obtains a list of commands that begin with a particular character string Step 3 abbreviated command entry lt Tab gt Example Switch sh conf lt tab gt Switch show configuration Completes a partial command name OL 29440 01 Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 Bi Using the Command Line Interface Understanding Abbreviated Commands Command or Action Purpose Step 4 7 Lists all commands available for a particular command mode Example Switch gt Step 5 command Lists the associated keywords for a command Example Switch gt show
191. toring Private VLANs 104 Where to Go Next 104 Additional References 104 Feature History and Information for Private VLANs 105 CHAPTER 6 Configuring VMPS 107 Finding Feature Information 107 Prerequisites for VMPS 107 Restrictions for VMPS 108 Information About VMPS 108 Dynamic VLAN Assignments 108 Dynamic Access Port VLAN Membership 109 Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 OL 29440 01 Contents Default VMPS Client Configuration 110 How to Configure VMPS 110 Entering the IP Address of the VMPS 110 Configuring Dynamic Access Ports on VMPS Clients 111 Reconfirming VLAN Memberships 113 Changing the Reconfirmation Interval 114 Changing the Retry Count 115 Troubleshooting Dynamic Access Port VLAN Membership 116 Monitoring the VMPS 117 Configuration Example for VMPS 117 Example VMPS Configuration 117 Where to Go Next 118 Additional References 119 Feature History and Information for VMPS 120 CHAPTER 7 Configuring IEEE 802 1Q and Layer 2 Protocol Tunneling 121 Finding Feature Information 121 Prerequisites for Configuring Tunneling 121 IEEE 802 1Q Tunneling and Incompatibilities 122 Layer 2 Protocol Tunneling 122 Layer 2 Tunneling for EtherChannels 124 Information about Tunneling 124 IEEE 802 1Q and Layer 2 Protocol Overview 124 IEEE 802 1Q Tunneling 124 IEEE 802 1Q Tunneling Configuration Guidelines 127 Native VLANs 127 System MTU 128 Default IEEE 802 1Q Tunneling Configuration 12
192. tree bpdu filter enable Enables BPDU filtering on the interface Example Switch config if spanning tree bpdu filter enable Step 9 exit Returns to global configuration mode Example Switch config if exit Step 10 errdisable recovery cause l2ptguard Optional Configures the recovery mechanism from a Layer 2 maximum rate error so that the interface is reenabled and can try again Example Errdisable recovery is disabled by default when enabled the default time interval is 300 seconds Switch config errdisable recovery cause 12ptguard Step 11 2protocol tunnel cos value Optional Configures the CoS value for all tunneled Layer 2 PDUs The range is 0 to 7 the default is the default CoS value for the interface Example If none is configured the default is 5 Switch config 1l2protocol tunnel cos 2 Step 12 end Returns to privileged EXEC mode Example Switch config end B Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 OL 29440 01 Configuring IEEE 802 10 and Layer 2 Protocol Tunneling Configuring the Customer Switch i Command or Action Purpose Step 13 show 12protocol Displays the Layer 2 tunnel ports on the switch including the protocols configured the thresholds and the counters Example Switch show 12protocol Step 14 copy running config startup config Optional Saves your entries in the configuration file Example Switch copy running
193. tunnel ae shutdown threshold point to point pagp Note If you also set a drop threshold on this interface the 100 shutdown threshold value must be greater than or equal to the drop threshold value Note Use the no I2protocol tunnel shutdown threshold point to point pagp lacp udld and the no 12protocol tunnel drop threshold point to point pagp lacp udld commands to return the shutdown and drop thresholds to the default settings Step 6 12protocol tunnel drop threshold Optional Configures the threshold for packets per second accepted point to point pagp lacp udld value for encapsulation The interface drops packets if the configured threshold OL 29440 01 Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 Configuring IEEE 802 10 and Layer 2 Protocol Tunneling A Configuring the SP Edge Switch Command or Action Purpose Example Switch config if l2protocol tunnel drop threshold point to point pagp 500 is exceeded If no protocol option is specified the threshold applies to each of the tunneled Layer 2 protocol types The range is 1 to 4096 The default is to have no threshold configured Note Ifyou also set a shutdown threshold on this interface the drop threshold value must be less than or equal to the shutdown threshold value Step 7 no cdp enable Disables CDP on the interface Example Switch config if no cdp enable Step 8 spanning
194. umber of routed ports SVIs and other configured features affects the usage of the switch hardware If the switch is notified by VTP of anew VLAN and the switch is already using the maximum available hardware resources it sends a message that there are not enough hardware resources available and shuts down the VLAN The output of the show vlan user EXEC command shows the VLAN ina suspended state Information About VTP VTP VTP Domain VTP is a Layer 2 messaging protocol that maintains VLAN configuration consistency by managing the addition deletion and renaming of VLANs on a network wide basis VTP minimizes misconfigurations and configuration inconsistencies that can cause several problems such as duplicate VLAN names incorrect VLAN type specifications and security violations VTP functionality is supported across the stack and all switches in the stack maintain the same VLAN and VTP configuration inherited from the active switch When a switch learns of anew VLAN through VTP messages or when a new VLAN is configured by the user the new VLAN information is communicated to all switches in the stack When a switch joins the stack or when stacks merge the new switches get VTP information from the active switch VTP version and version 2 support only normal range VLANs VLAN IDs to 1005 VTP version 3 supports the entire VLAN range VLANs 1 to 4094 Extended range VLANs VLANs 1006 to 4094 are supported only in VTP version 3 You
195. unk IEEE 802 1Q IEEE 802 1Q Industry standard trunking encapsulation A trunk port is a member of all VLANs by default including extended range VLANs but membership can be limited by configuring the allowed VLAN list You can also modify the pruning eligible list to block flooded traffic to VLANs on trunk ports that are included in the list VTP is recommended but not required VTP maintains VLAN configuration consistency by managing the addition deletion and renaming of VLANs on a network wide basis VTP exchanges VLAN configuration messages with other switches over trunk links Dynamic access A dynamic access port can belong to one VLAN VLAN ID 1 to 4094 and is dynamically assigned by a VLAN Member Policy Server VMPS The VMPS can be a Catalyst 6500 series switch for example but never a Catalyst 2960 2960 S or 2960 C switch The Catalyst 2960 2960 S or 2960 C switch is a VMPS client You can have dynamic access ports and trunk ports on the same switch but you must connect the dynamic access port to an end station or hub and not to another switch VTP is required Configure the VMPS and the client with the same VTP domain name To participate in VTP at least one trunk port on the switch or a switch stack must be connected to a trunk port of a second switch or switch stack Voice VLAN Normal Range VLAN Overview A voice VLAN port is an access port attached to a Ci
196. unks or nontrunking links When IEEE 802 1Q trunks are used in these core switches the native VLANs of the IEEE 802 1Q trunks must not match any native VLAN of the nontrunking tunneling port on the same switch because traffic on the native VLAN would not be tagged on the IEEE 802 1Q sending trunk port In the following network figure VLAN 40 is configured as the native VLAN for the IEEE 802 1Q trunk port from Customer X at the ingress edge switch in the service provider network Switch B Switch A of Customer X sends a tagged packet on VLAN 30 to the ingress tunnel port of Switch B in the service provider network which belongs to access VLAN 40 Because the access VLAN of the tunnel port VLAN 40 is the same as the native VLAN of the edge switch trunk port VLAN 40 the metro tag is not added to tagged packets received from the tunnel port The packet carries only the VLAN 30 tag through the service provider network to the trunk port of the egress edge switch Switch C and is misdirected through the egress switch tunnel port to Customer Y These are some ways to solve this problem e Use the vlan dotlq tag native global configuration command to configure the edge switch so that all packets going out an IEEE 802 1Q trunk including the native VLAN are tagged If the switch is configured to tag native VLAN packets on all IEEE 802 1Q trunks the switch accepts untagged packets but sends only tagged packets OL 29440 01 Catalyst 2960 X
197. unt on Cisco com is not required Prerequisites for Private VLANs The following are prerequisites for configuring private VLANs e When you configure private VLANs on switches running VTP the switch must be in VTP transparent mode e When configuring private VLANs on the switch always use the default Switch Database Management SDM template to balance system resources between unicast routes and Layer 2 entries If another SDM Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 OL 29440 01 Configuring Private VLANs a Secondary and Primary VLAN Configuration template is configured use the sdm prefer default global configuration command to set the default template Secondary and Primary VLAN Configuration Follow these guidelines when configuring private VLANs e If the switch is running VTP version 1 or 2 you must set VTP to transparent mode After you configure a private VLAN you should not change the VTP mode to client or server VTP version 3 supports private VLANs in all modes e With VTP version 1 or 2 after you have configured private VLANs use the copy running config startup config privileged EXEC command to save the VTP transparent mode configuration and private VLAN configuration in the switch startup configuration file Otherwise if the switch resets it defaults to VTP server mode which does not support private VLANs VTP version 3 does support private VLANs e VTP version
198. ure was introduced Catalyst 2960 XR Switch VLAN Configuration Guide Cisco IOS Release 15 0 2 EX1 OL 29440 01 Configuring VTP A Feature History and Information for VTP Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 OL 29440 01 CHAPTER Configuring VLANs e Finding Feature Information page 39 e Prerequisites for VLANs page 39 e Restrictions for VLANs page 40 Information About VLANs page 40 e How to Configure VLANs page 47 e Monitoring VLANs page 56 e Configuration Examples page 57 e Where to Go Next page 58 Additional References page 58 Feature History and Information for VLAN page 59 Finding Feature Information Your software release may not support all the features documented in this module For the latest feature information and caveats see the release notes for your platform and software release Use Cisco Feature Navigator to find information about platform support and Cisco software image support To access Cisco Feature Navigator go to http www cisco com go cfn An account on Cisco com is not required Prerequisites for VLANs The following are prerequisites and considerations for configuring VLANs e The switch supports 1005 VLANs when running the IP Lite image The switch supports 256 SVIs when running the IP Lite image Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 OL 29440 01 Configuring VLANs
199. urity of your private VLAN configuration and to avoid other use of the VLANs configured as private VLANs configure private VLANs on all intermediate devices including devices that have no private VLAN ports IP Addressing Scheme with Private VLANs Assigning a separate VLAN to each customer creates an inefficient IP addressing scheme e Assigning a block of addresses to a customer VLAN can result in unused IP addresses If the number of devices in the VLAN increases the number of assigned address might not be large enough to accommodate them These problems are reduced by using private VLANs where all members in the private VLAN share a common address space which is allocated to the primary VLAN Hosts are connected to secondary VLANs and the DHCP server assigns them IP addresses from the block of addresses allocated to the primary VLAN Subsequent IP addresses can be assigned to customer devices in different secondary VLANs but in the same primary VLAN When new devices are added the DHCP server assigns them the next available address from a large pool of subnet addresses Private VLANs Across Multiple Switches As with regular VLANs private VLANs can span multiple switches A trunk port carries the primary VLAN and secondary VLANs to a neighboring switch The trunk port treats the private VLAN as any other VLAN Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 OL 29440 01 Configuring Private V
200. use the Return and Space bar keystrokes whenever you see the More prompt Space bar Scrolls down one screen Ctrl L or Ctrl R Redisplays the current command line if the switch suddenly sends a message to your screen You can use a wraparound feature for commands that extend beyond a single line on the screen When the cursor reaches the right margin the command line shifts ten spaces to the left You cannot see the first ten characters of the line but you can scroll back and check the syntax at the beginning of the command The keystroke actions are optional To scroll back to the beginning of the command entry press Ctrl B or the left arrow key repeatedly You can also press Ctrl A to immediately move to the beginning of the line Note SUMMARY STEPS The arrow keys function only on ANSI compatible terminals such as VT100s The following example shows how to wrap a command line that extend beyond a single line on the screen 1 access list 2 Ctrl A 3 Return key OL 29440 01 Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 Bi Using the Command Line Interface Searching and Filtering Output of show and more Commands DETAILED STEPS Command or Action Purpose Step 1 access list Displays the global configuration command entry that extends beyond one line Example When the cursor first reaches the end of the line the line is shifted ten Switch
201. ut your products you can subscribe to various services such as the Product Alert Tool accessed from Field Notices the Cisco Technical Services Newsletter and Really Simple Syndication RSS Feeds Access to most tools on the Cisco Support website requires a Cisco com user ID and password http www cisco com support Feature History and Information for VLAN Trunks E Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 Release Modification Cisco IOS 15 0 2 EX1 This feature was introduced OL 29440 01 CHAPTER 5 Configuring Private VLANs e Finding Feature Information page 83 e Prerequisites for Private VLANs page 83 e Restrictions for Private VLANs page 86 e Information About Private VLANs page 87 How to Configure Private VLANs page 93 e Monitoring Private VLANs page 101 e Configuration Examples for Private VLANs page 102 e Where to Go Next page 104 Additional References page 104 Feature History and Information for Private VLANs page 105 Finding Feature Information Your software release may not support all the features documented in this module For the latest feature information and caveats see the release notes for your platform and software release Use Cisco Feature Navigator to find information about platform support and Cisco software image support To access Cisco Feature Navigator go to http www cisco com go cfn An acco
202. ution Timesaver A Warning Means reader be careful In this situation you might do something that could result in equipment damage or loss of data Means the described action saves time You can save time by performing the action described in the paragraph Means reader be warned In this situation you might perform an action that could result in bodily injury E Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 OL 29440 01 Preface Related Documentation i Related Documentation amp Note Before installing or upgrading the switch refer to the switch release notes e Catalyst 2960 XR Switch documentation located at http www cisco com go cat2960xr_docs e Cisco SFP and SFP modules documentation including compatibility matrixes located at http www cisco com en US products hw modules ps5455 tsd_products_support_series_home html e Cisco Validated Designs documents located at http www cisco com go designzone Obtaining Documentation and Submitting a Service Request For information on obtaining documentation submitting a service request and gathering additional information see the monthly What s New in Cisco Product Documentation which also lists all new and revised Cisco technical documentation at http www cisco com en US docs general whatsnew whatsnew html Subscribe to the What s New in Cisco Product Documentation as a Really Simple
203. value Enter a port priority value from 0 to 240 Port priority values increment by 16 Example Switch config if spanning tree vlan 8 10 port priority 16 Step 18 exit Returns to global configuration mode Example Switch config if exit Step 19 interface interface id Defines the interface to set the STP port priority and Example Switch config interface gigabitethernet1 0 2 enters interface configuration mode E Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 OL 29440 01 Configuring VLAN Trunks Configuring Trunk Ports for Load Sharing i Command or Action Purpose Step 20 Step 21 Step 22 Step 23 spanning tree vlan vian range port priority priority value Example Switch config if spanning tree vlan 3 6 port priority 16 end Example Switch config if end show running config Example Switch show running config copy running config startup config Example Switch copy running config startup config Assigns the port priority for the VLAN range specified Enter a port priority value from 0 to 240 Port priority values increment by 16 Returns to privileged EXEC mode Verifies your entries Optional Saves your entries in the configuration file Related Topics Network Load Sharing Using STP Priorities on page 64 Configuring Load Sharing Using STP Path Cost These steps describe how to configure a network
204. witch running configuration file and you can save it in the switch Catalyst 2960 XR Switch VLAN Configuration Guide Cisco IOS Release 15 0 2 EX1 OL 29440 01 Configuring VTP VTP Configuration Guidelines startup configuration file by entering the copy running config startup config privileged EXEC command You must use this command if you want to save VTP mode as transparent even if the switch resets When you save VTP information in the switch startup configuration file and reboot the switch the switch configuration is selected as follows e Ifthe VTP mode is transparent in the startup configuration and the VLAN database and the VTP domain name from the VLAN database matches that in the startup configuration file the VLAN database is ignored cleared and the VTP and VLAN configurations in the startup configuration file are used The VLAN database revision number remains unchanged in the VLAN database e If the VTP mode or domain name in the startup configuration do not match the VLAN database the domain name and VTP mode and configuration for VLAN IDs 1 to 1005 use the VLAN database information Domain Names for Configuring VTP When configuring VTP for the first time you must always assign a domain name You must configure all switches in the VTP domain with the same domain name Switches in VTP transparent mode do not exchange VTP messages with other switches and you do not need to configure a VTP domain name for them
205. with load sharing using STP path costs OL 29440 01 Catalyst 2960 XR Switch VLAN Configuration Guide Cisco IOS Release 15 0 2 EX1 E Configuring VLAN Trunks A Configuring Trunk Ports for Load Sharing SUMMARY STEPS DETAILED STEPS peOnontwn a w N O 14 15 16 configure terminal interface interface id switchport mode trunk exit Repeat Steps 2 through 4 on a second interface in Switch A or in Switch A stack end show running config show vlan configure terminal interface interface id spanning tree vlan vlan range cost cost value end Repeat Steps 9 through 13 on the other configured trunk interface on Switch A and set the spanning tree path cost to 30 for VLANSs 8 9 and 10 exit show running config copy running config startup config Step 1 Command or Action Purpose configure terminal Enters global configuration mode on Switch A Example Switch configure terminal Step 2 interface interface id Defines the interface to be configured as a trunk and enters interface configuration mode Example Switch config interface gigabitethernet1 0 1 Step 3 switchport mode trunk Configures the port as a trunk port Example Switch config if switchport mode trunk E Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 OL 29440 01 Configuring VLAN Trunks Configuring Trunk Ports for Load Sharing Co
206. xi Document Conventions x Related Documentation xiii Obtaining Documentation and Submitting a Service Request xiii CHAPTER 1 Using the Command Line Interface 1 Information About Using the Command Line Interface 1 Command Modes 1 Using the Help System 3 Understanding Abbreviated Commands 4 No and default Forms of Commands 4 CLI Error Messages 4 Configuration Logging 5 How to Use the CLI to Configure Features 5 Configuring the Command History 5 Changing the Command History Buffer Size 6 Recalling Commands 6 Disabling the Command History Feature 7 Enabling and Disabling Editing Features 7 Editing Commands through Keystrokes 8 Editing Command Lines That Wrap 9 Searching and Filtering Output of show and more Commands 10 Accessing the CLI through a Console Connection or through Telnet 11 CHAPTER 2 Configuring VTP 13 Finding Feature Information 13 Prerequisites for VTP 13 Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 OL 29440 01 Contents Information About VTP 14 VTP 14 VTP Domain 14 VTP Modes 15 VTP Advertisements 16 VTP Version 2 17 VTP Version 3 17 VTP Pruning 18 VTP and Switch Stacks 20 VTP Configuration Guidelines 20 Configuration Requirements 20 VTP Settings 20 Domain Names for Configuring VTP 21 Passwords for the VTP Domain 21 VTP Version 22 Default VTP Configuration 23 How to Configure VTP 24 Configuring VTP Mode 24 Configuring a VTP Version 3 Password 26 Configur
207. y VLAN to allow Layer 3 switching of private VLAN traffic OL 29440 01 Catalyst 2960 XR Switch VLAN Configuration Guide Cisco IOS Release 15 0 2 EX1 E Configuring Private VLANs Mapping Secondary VLANs to a Primary VLAN Layer 3 VLAN Interface SUMMARY STEPS 1 configure terminal 2 interface vlan primary _vilan_id 3 private vlan mapping add remove secondary_vlan_list 4 end 5 show interface private vlan mapping 6 copy running config startup config DETAILED STEPS Command or Action Purpose Step 1 configure terminal Enters global configuration mode Example Switch configure terminal Step 2 interface vlan primary _vlan_id Enters interface configuration mode for the primary VLAN and configures the VLAN as an SVI The VLAN ID range is 2 to 1001 Example and 1006 to 4094 Switch config interface vlan 10 Step 3 private vlan mapping add remove Maps the secondary VLANs to the Layer 3 VLAN interface of a secondary _vlan_list primary VLAN to allow Layer 3 switching of private VLAN ingress traffic Example The secondary_vlan_list parameter cannot contain spaces It can switek c ntig it i private vlan mapping contain multiple comma separated items Each item can be a single 501 502 private VLAN ID or a hyphenated range of private VLAN IDs Enter a secondary_vlan_list or use the add keyword with a secondary_vlan_list to map the secondary VLANs to the primary VLAN Use the remove keyword with a secondary_vl
208. y Simple Syndication RSS Feeds Access to most tools on the Cisco Support website requires a Cisco com user ID and password http www cisco com support Feature History and Information for Private VLANs Release Modification Cisco IOS 15 0 2 EX1 This feature was introduced OL 29440 01 Catalyst 2960 XR Switch VLAN Configuration Guide Cisco IOS Release 15 0 2 EX1 E Configuring Private VLANs A Feature History and Information for Private VLANs Catalyst 2960 XR Switch VLAN Configuration Guide Cisco 10S Release 15 0 2 EX1 OL 29440 01 CHAPTER Configuring VMPS e Finding Feature Information page 107 e Prerequisites for VMPS page 107 e Restrictions for VMPS page 108 Information About VMPS page 108 e How to Configure VMPS page 110 e Monitoring the VMPS page 117 e Configuration Example for VMPS page 117 e Where to Go Next page 118 Additional References page 119 e Feature History and Information for VMPS page 120 Finding Feature Information Your software release may not support all the features documented in this module For the latest feature information and caveats see the release notes for your platform and software release Use Cisco Feature Navigator to find information about platform support and Cisco software image support To access Cisco Feature Navigator go to http www cisco com go cfn An account on Cisco com is not required Prerequisit
209. you cannot configure subinterfaces or use the encapsulation keyword on Layer 3 interfaces The switch does support Layer 2 trunks and Layer 3 VLAN interfaces which provide equivalent capabilities information About VLAN Trunks Trunking Overview A trunk is a point to point link between one or more Ethernet switch interfaces and another networking device such as a router or a switch Ethernet trunks carry the traffic of multiple VLANSs over a single link and you can extend the VLANs across an entire network The following trunking encapsulations are available on all Ethernet interfaces IEEE 802 1 Q Industry standard trunking encapsulation Trunking Modes Ethernet trunk interfaces support different trunking modes You can set an interface as trunking or nontrunking or to negotiate trunking with the neighboring interface To autonegotiate trunking the interfaces must be in the same VTP domain Trunk negotiation is managed by the Dynamic Trunking Protocol DTP which is a Point to Point Protocol PPP However some internetworking devices might forward DTP frames improperly which could cause misconfigurations To avoid this you should configure interfaces connected to devices that do not support DTP to not forward DTP frames that is to turn off DTP If you do not intend to trunk across those links use the switchport mode access interface configuration command to disable trunking e To enable trunking to a device that d

Cisco Systems WSC2960XR48FPSI User's Manual

Contents

Download Pdf Manuals

Related Search

Related Contents