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Avaya Configuring LLC Services (308635-14.20 Rev 00) User's Manual

1. DLCI 100 Frame relay C L DLCI 101 Router A Router B Connection request Mapping Table for Router B DLCI Remote MAC Local MAC Source MAC smac virtual 100 400000000003 Destination MAC dmac 400000000003 101 400000000003 LLCO0009A Figure 2 3 Frame Relay to Virtual MAC Topology 308635 14 20 Rev 00 2 7 Configuring LLC Services Physical MAC to Frame Relay Figure 2 4 illustrates a sample physical MAC address to frame relay DLCI mapping In this network the PC makes connection requests to hosts 1 and 2 The workstation administrator does not have control over the PC configuration and must use a configuration with real physical MAC addresses for the remote hosts At router B a mapping table maps hosts 1 and 2 to the DLCIs assigned to the hosts The connection request received at router A will have the source MAC address of the PC MAC and a destination MAC address of remote host 1 or 2 Configuration at PC Remote host 1 400000000001 Remote host 2 400000000002 PC MAC 400000000003 DLCI 100 Frame relay CS DCI 101 DLSw Router A Router B gt Connection request Mapping Table for Router B Remote MAC Local MAC DLCI Source MAC smac PC MAC 400000000001 100 Destination MAC dmac remote host 1 or 2 400000000002 101 LLC0010A Figure 2 4 Physical MAC to Frame Relay Topology 2 8
2. Preface Indicates file and directory names new terms book titles and variables in command syntax descriptions Where a variable is two or more words the words are connected by an underscore Example If the command syntax is show at lt valid_route gt valid_route is one variable and you substitute one value for it Indicates system output for example prompts and system messages Example Set Trap Monitor Filters Shows menu paths Example Protocols gt IP identifies the IP option on the Protocols menu Separates choices for command keywords and arguments Enter only one of the choices Do not type the vertical line when entering the command Example If the command syntax is show ip alerts routes you enter either show ip alerts or show ip routes but not both 308635 14 20 Rev 00 XV Configuring LLC Services Acronyms This guide uses the following acronyms ANSI American National Standards Institute APPN Advanced Peer to Peer Networking ATM asynchronous transfer mode BAN Boundary Access Node BNI Boundary Node Identifier BNN Boundary Network Node DLCI data link connection identifier DLSw data link switching DNA data network address DSPU downstream physical unit DSAP destination service access point FDDI Fiber Distributed Data Interface FEP front end processor FR frame relay FRAD Frame Relay Access Device FRMR frame reject IEEE Institute of Electrical and Electro
3. Any other LAN media supporting source route bridging SRB including FDDI 1 2 308635 14 20 Rev 00 Logical Link Control Overview e WAN interfaces Frame relay Boundary Network Node BNN and Boundary Access Node BAN interfaces Any other WAN media supporting source route bridging traffic including Point to Point Protocol PPP Frame Relay Support Figure 1 1 illustrates the connection of a host through a frame relay network in a configuration with multiprotocol traffic to other locations 308635 14 20 Rev 00 Configuring LLC Services Host Frame relay network E Single switch DLSw Ee DLSw Nortel Networks router TCP IP l Nortel Networks Client router LLC0015A Figure 1 1 Sample Frame Relay Network Nortel Networks provides two ways to communicate directly with an SNA processor such as an IBM 3745 or AS 400 over frame relay e Boundary Network Node e Boundary Access Node 1 4 308635 14 20 Rev 00 Logical Link Control Overview Boundary Network Node The Boundary Network Node refers to the RFC 1490 specification for routed SNA over frame relay This implementation of LLC2 also complies with the Frame Relay Forum 3 FRE 3 Multiple Protocol Encapsulation over Frame Relay Implementation Agreements which defines how SNA traff
4. Choose a value that is appropriate for the applications LLC2 supports 1 3 6 1 4 1 18 3 5 1 6 2 1 14 Busy Timer Protocols gt LLC2 gt Interfaces 60 s 1 to 60 Specifies the amount of time in seconds during which the local LLC waits for an indication from a remote LLC that it is ready to receive PDUs from the local LLC The busy condition at the remote LLC has been cleared If the remote busy timer expires and no indication has been received that the remote busy condition has been cleared the remote busy timer restarts and LLC again waits either for the remote busy cleared indication or for expiration of the remote busy timer interval Enter any valid value from 1 to 60 Choose a value that is appropriate for the applications LLC2 supports 1 3 6 1 4 1 18 3 5 1 6 2 1 15 A 16 308635 14 20 Rev 00 Parameter Path Default Options Function Instructions MIB Object ID Parameter Path Default Options Function Instructions MIB Object ID Site Manager Parameters Inactivity Timer Protocols gt LLC2 gt Interfaces 30 s 1 to 30 Specifies the amount of time in seconds during which the local LLC expects to receive a PDU soliciting the status of the remote LLC If the inactivity timer expires the local LLC sends an S format PDU with the P bit set to solicit the status of the remote It initiates the ack timer to handle retries Enter any valid value from 1 to 30 This ti
5. Unnumbered The U format PDU is available for type 1 or type 2 operations and format U provides additional data link control functions and unsequenced information transfer Table 1 3 further defines the purpose of parameter bits in the PDU control field Table 1 3 Control Field Bits and Functions Bit Function Send Only PDUs contain N S which is the sequence number of the PDU sequence being transmitted number N S bit Receive PDUs contain N R which is the sequence number of the PDU an sequence LLC expects to receive next on the specified data link connection number N R bit Poll final The P F bit solicits polls a response from the addressed LLC The P F bit final F bit indicates the response PDU sent as a result of a soliciting poll command 308635 14 20 Rev 00 Configuring LLC Services Table 1 4 further defines the purpose of each command and response PDU Table 1 4 Command Names and Definitions Control Command Field Response Value Definition Unnumbered 0x13 Transports information to one or more LLCs Since this information Ul or is a type 1 operation there is no corresponding 0x03 response reply PDU Exchange OxBF The XID command PDU conveys to the destination identification XID or LLC OxAF e The types of LLC services the source LLC supports e The receive window size the source LLC supports per data link connection per virtual circuit The X
6. Accessing LLC Parameters To access and edit LLC parameters begin at the Configuration Manager window and select Protocols gt LLC2 The LLC2 menu opens Alternatively you can access LLC parameter windows by highlighting a circuit in the Configuration Manager window and then selecting Edit Circuit to invoke the Circuit Definition window This window is described in Configuring and Managing Routers with Site Manager Use the LLC Circuit menu to access LLC parameters You can select either LLC1 Circuit or LLC2 Circuit from either menu If you select LLC1 from the menu the screen displays a list of interfaces that use LLC1 only such as source routing bridge If you select LLC2 the screen displays a list of interfaces that require the services of LLC2 such as APPN DLSw and LNM servers Add LLC2 Frame Relay SVC Mappings Parameters The LLC2 Frame Relay SVC Mapping Add window Figure A 1 contains the following parameters e MAC Address address of the end station to be mapped e Mapping Type specifies whether this is a remote or local mapping e X121 Addr address that is registered with frame relay to accept an incoming call if the mapping is local or to establish an SVC to the configured number if the mapping is remote e Sub Addr outbound or inbound calling or called party subaddress A 2 308635 14 20 Rev 00 Site Manager Parameters Numbering Plan specifies whether this SVC uses the E 164 or X 121 number
7. DLCIs mapping to MACs 2 4 to 2 11 DLSw and LLC2 over Frame Relay BAN configuring using BCC 3 9 3 10 configuring using Site Manager 3 11 3 12 DLSw and LLC2 over Frame Relay BNN and local mapping 3 16 and remote mapping 3 15 configuring using BCC and PVCs 3 12 to 3 14 configuring using BCC and SVCs 3 16 3 17 Index 1 configuring using Site Manager and PVCs 3 14 3 15 configuring using Site Manager and SVCs 3 18 with PVCs 3 12 with SVCs 3 15 E Enable global parameter A 10 Enable interface parameter A 11 F FRAD frame relay access device use of in LLC2 2 1 2 4 frame relay 1 3 to 1 6 frame relay mappings editing 4 13 4 15 frame relay to frame relay addressing 2 10 frame relay to physical MAC addressing 2 9 frame relay to virtual MAC addressing 2 7 Frame Relay Virtual MAC Address parameter A 18 IBM NCP compatibility 2 2 Inactivity Timer parameter A 17 inbound traffic filters editing 4 16 information field formats 1 21 interface parameters Ack Timer for Xmt A 15 Busy Timer A 16 Enable interface A 11 Frame Relay Virtual MAC Address A 18 Inactivity Timer A 17 Max Links A 17 Max Octets in I A 12 Max Octets in UI A 12 Max Retry After Time Out max number of transmissions A 14 Receive Window A 13 Reject Timer A 16 Send Window A 14 Virtual Ring Number A 18 Index 2 L LLC2 Configuration Hierarchy 3 2 LLC2 Frame Relay Mapping Add window A 7 LLC2 Frame
8. navigate in configuration mode to the top level box prompt 1 Specify the ATM interface on which you want to configure LLC2 box atm 3 1 atm 3 1 Enable signaling on the ATM interface atm 3 1 signaling signaling 3 1 Return to the ATM interface prompt signaling 3 1 back atm 3 1 Create a LAN emulation client LEC service record for that interface For example to create a service record with the name servicel enter atm 3 1 lec service service1 lec service service1 Configure LLC2 on the ATM interface lec service servicel Ilc2 11c2 service1 308635 14 20 Rev 00 3 7 Configuring LLC Services Using Site Manager To enable LLC2 over ATM LANE complete the following tasks Site Manager Procedure You do this System responds 1 In the Configuration Manager window select the ATM connector on which you are enabling DLSw services The Add Circuit window opens 5 Click on Service Attributes 2 Click on OK The Select Connection Type window opens 3 Click on ATM The Initial ATM Signaling Config window opens 4 Click on OK The Edit ATM Connector window opens The ATM Service Records List window opens 6 Click on Add The ATM Service Record Parameters window opens 7 Edit the parameters you want See Appendix A in Configuring ATM and MPLS Services for parameter descriptions 8 Click on OK The Select Protocols window opens 9 Choose LLC
9. opens 4 18 308635 14 20 Rev 00 Appendix A Site Manager Parameters This appendix describes configurable LLC service parameters The parameter descriptions follow the same order as the parameters appearing in the Site Manager windows Table A 1 shows how the parameters are organized Table A 1 Organization of Parameters Parameter Section Page Accessing LLC Parameters A 2 Add LLC2 Frame Relay SVC Mappings Parameters A 2 LLC2 Frame Relay SVC Mappings Parameters A 5 Add LLC2 Frame Relay PVC Mappings Parameters A 6 LLC2 Frame Relay PVC Mappings Parameters A 8 LLC2 Global Parameters A 9 LLC2 Interface Parameters A 10 Using the Parameter Descriptions Each LLC parameter description provides information about default settings valid parameter options the parameter function instructions for setting the parameter and the management information base MIB object ID 308635 14 20 Rev 00 A 1 Configuring LLC Services The Technician Interface allows you to modify parameters by issuing set and commit commands with the MIB object ID This process is equivalent to modifying parameters using Site Manager For more information about using the Technician Interface to access the MIB see Using Technician Interface Software Caution The Technician Interface does not verify that the value you enter for a parameter is valid Entering an invalid value can corrupt your configuration
10. Configure LLC2 on the serial interface service servicel llc2 1l1c2 servicel 9 Configure the MAC address you want the SVC to use 1lc2 servicel fr sve 111111111111 fr svce 111111111111 10 Return to the Ilc2 prompt fr svc 111111111111 back 1lc2 servicel 11 Configure DLSw on the serial interface llc2 service1 disw dlsw servicel 12 Display DLSw default settings dlsw servicel info 308635 14 20 Rev 00 3 17 Configuring LLC Services Using Site Manager To enable DLSw and LLC2 over frame relay BNN using SVCs complete the following tasks Site Manager Procedure You do this System responds 1 In the Configuration Manager window select the synchronous connector on which you are enabling DLSw services The Add Circuit window opens 2 Click on OK The WAN Protocols window opens 3 Choose Frame Relay 4 Click on OK The Select Protocols window opens 5 Choose DLSw When you choose DLSw you automatically choose LLC2 6 Click on OK The Frame Relay SNA Connection window opens 7 Click on BNN SVC The DLSw Basic Global Parameters window opens 8 Set the following parameters e DLSw RFC Version e DLSw Virtual Ring ID hex e DLSw Peer IP Address dual switch networks only Refer to Configuring DLSw Services for descriptions of the parameters 9 Click on OK The DLSw Basic Interface window opens 10 Set DLSw Slot IP Address Refer to Configuri
11. Configuring LLC Services Text Conventions This guide uses the following text conventions angle brackets lt gt bold text braces brackets ellipsis points Indicate that you choose the text to enter based on the description inside the brackets Do not type the brackets when entering the command Example If the command syntax is ping lt i p_address gt you enter ping 192 32 10 12 Indicates command names and options and text that you need to enter Example Enter show ip alerts routes Example Use the dinfo command Indicate required elements in syntax descriptions where there is more than one option You must choose only one of the options Do not type the braces when entering the command Example If the command syntax is show ip alerts routes you must enter either show ip alerts or show ip routes but not both Indicate optional elements in syntax descriptions Do not type the brackets when entering the command Example If the command syntax is show ip interfaces alerts you can enter either show ip interfaces or show ip interfaces alerts Indicate that you repeat the last element of the command as needed Example If the command syntax is ethernet 2 1 lt parameter gt lt value gt you enter ethernet 2 1 and as many parameter value pairs as needed xiv 308635 14 20 Rev 00 italic text screen text separator gt vertical line
12. Edit LLC2 Global Parameters Window 308635 14 20 Rev 00 A 9 Configuring LLC Services Parameter Path Default Options Instructions MIB Object ID Function Enable Protocols gt LLC2 gt Global Enable Enable Disable Globally enables or disables the system software mechanisms that in turn allow or do not allow users to add an LLC2 interface to any 802 x LAN physical circuit You can configure only one LLC2 interface per physical LAN circuit Other significant actions the system software performs when you choose a setting for the LLC Enable parameter include Disable Forces every LLC2 interface on this node into the inoperative down state Enable Reinitializes every LLC2 interface on this node with each interface maintaining the most recent setting of its own interface Enable parameter The actual operating state of each interface further depends on the current up down state of the associated physical circuit Select Disable to force every LLC2 interface existing on this node into the inoperative down state Select Enable only when an existing LLC2 interface is in the Disabled state 1 3 6 1 4 1 18 3 5 1 6 1 2 LLC2 Interface Parameters The LLC2 Interface Configuration window Figure A 6 lets you customize LLC2 interface parameters for specific clients such as DLSw and LAN Network Manager These and other LLC2 clients may be configured on the same physical circuits and therefore share t
13. Figure 2 1 Sample Frame Relay Network Using LLC2 ssssseesseseseeseesreereerresrrsne 2 3 Figure 2 2 Virtual MAC to Frame Relay Topology ssesseeseesseeeiesriesrisrrreerrssrresens 2 6 Figure 2 3 Frame Relay to Virtual MAC Topology ssssesssssseesseessrsreessreerrrsrrresrrrsnses 2 7 Figure 2 4 Physical MAC to Frame Relay Topology TT Menia 2 8 Figure 2 5 Frame Relay to Physical MAC Topology cccseceesseeeeseeeeteneeeeenees 2 10 Figure 2 6 Frame Relay to Frame Relay Topology c sccceeeseeeeeeeeeeteeeeeeees mae lt Figure 2 7 RFC 1490 Bridging and Routing Standards for SNA 2 12 Figure 3 1 LLC2 Configuration Hierarchy ccccccscccscscesenaceesceeadzadecienass ads sccmertarsaeciannaie 3 2 Figure A 1 _ LLC2 Frame Relay SVC Mapping Add Window 0 giredgiaveaslestees A 3 Figure A 2 LLC2 Frame Relay SVC Mappings c cccsssceeseceeeseeeeeneeeeeneneeteaeees A 6 Figure A 3 LLC2 Frame Relay PVC Mapping Add Window sssr A 7 Figure A 4 LLC2 Frame Relay PVC Mappings Window 005 E A 9 Figure A 5 Edit LLC2 Global Parameters WiNdOW c ccsscccecsesseeeeesessteeessessneeees A 9 Figure A 6 LLC2 Interface Configuration Window scccceeeeeeeeeeeeteeteteeeeeeee ACT 308635 14 20 Rev 00 ix Tables Table 1 1 LE Command PS ss ces ceed ee by aed cides ease as et 1 11 Table 1 2 PDU Format ang FUNCION scscicissccestidvasecennauscaasheedassaemusemnaieiesanme 1 17 Tab
14. In the Configuration Manager window choose Protocols The Protocols menu opens 2 Choose LLC2 The LLC2 menu opens 3 Choose Interfaces The LLC2 Interface Configuration window opens Click on the interface you want to customize Set the Max Links parameter Click on Help or see the parameter description on page A 17 6 Click on Apply 7 Click on Done The Configuration Manager window opens Customizing LLC2 over Frame Relay The following section describes how to customize LLC2 over frame relay using the BCC or Site Manager Configuring the Frame Relay Virtual MAC Address Mask The frame relay virtual MAC address mask specifies the upper 2 to 4 bytes of a virtual destination MAC address The lower remaining bytes specify the DLCI to be used Using the BCC To configure the frame relay virtual MAC address mask navigate to the Ilc2 interface prompt for example box serial 2 1 Ilc2 and enter fr virtual mask lt mask gt 308635 14 20 Rev 00 Configuring LLC Services mask specifies the upper 2 to 4 bytes of a virtual destination MAC address The lower remaining bytes specify the DLCI to be used Select a mask that is unique within your network The mask should be the upper 2 to 4 bytes of a standard MSB token ring MAC address For example to set a mask of 0x400000FF enter 1llc2 serial 1 2 fr virtual mask 0x400000FF 1llc2 serial 1 2 Using Site Manager
15. LLC drops frames it receives outside this window and recovers them via timers Instructions Enter any valid value from 1 to 127 LLC PDUs For sessions that do not negotiate XIDs SNA PU 2 0 and NetBIOS set the router Receive Window to the largest end station s send window If the Receive Window is too small the router discards frames it receives outside this window Timers recover these frames and dropping these frames degrades performance On a mainframe s front end processor the Max Out parameter in the NCP controls the front end s transmit window Therefore if the Max Out in the NCP is set to 127 you should set the router Receive Window to 127 For sessions which negotiate XIDs SNA PU 2 1 the Receive Window sets dynamically during connection establishment The router uses the value specified here as an upper limit and negotiates downward Choose a value that is appropriate for the applications LLC2 supports MIB Object ID 1 3 6 1 4 1 18 3 5 1 6 2 1 22 308635 14 20 Rev 00 A 13 Configuring LLC Services Parameter Path Default Options Function Instructions MIB Object ID Parameter Path Default Options Function Instructions MIB Object ID Send Window Protocols gt LLC2 gt Interfaces 7 PDUs 1 to 127 Specifies a maximum number of information PDUs that can be outstanding sent or transmitted at any given time The value serves as a default Send Window size when no other size
16. Reject Timer Busy Timer or Inactivity Timer parameters Click on Help or see the parameter descriptions beginning on page A 15 6 Click on Apply 7 Click on Done The Configuration Manager window opens 308635 14 20 Rev 00 Customizing LLC Services Specifying the Maximum Number of PDU Retries After Timeout The following sections describe how to specify the maximum number of times that a PDU can be sent following expiration of a transmit acknowledgment or reject timer You can complete these tasks using the BCC or Site Manager Using the BCC To specify the maximum number of times that a PDU can be sent following expiration of the transmit acknowledgment timer or the reject timer navigate to the llc2 interface prompt for example box ethernet 2 1 Ilc2 and enter n2 lt number_of_retransmissions gt number_of_retransmissions is the maximum number of times that a PDU can be sent following expiration of the ack xmt timer or the reject timer The values are 1 to 10 For example the following command changes the maximum number of times to 5 llc2 ethernet 2 1 n25 Using Site Manager To specify the maximum number of times that a PDU can be sent following the expiration of the Ack Timer for Xmt or the Reject Timer complete the following tasks Site Manager Procedure You do this System responds 1 In the Configuration Manager window The Protocols menu opens choose Protoco
17. To configure the frame relay virtual MAC address mask complete the following tasks Site Manager Procedure You do this System responds 1 In the Configuration Manager window The Protocols menu opens choose Protocols 2 Choose LLC2 The LLC2 menu opens 3 Choose Interfaces The LLC2 Interface Configuration window opens 4 Click on the interface you want to customize 5 Set the Frame Relay Virtual MAC Address Mask parameter Click on Help or see the parameter description on page A 18 6 Click on Apply 7 Click on Done The Configuration Manager window opens Editing Frame Relay PVC Mappings Using the BCC To edit frame relay mappings that you previously configured navigate to the Ilc2 dlci interface prompt for example box serial 2 1 Ilc2 dilci lt d ci_no gt and enter local mac lt ocal_mac gt remote mac lt remote mac gt 308635 14 20 Rev 00 Customizing LLC Services local_mac is the local MAC address mapping incoming requests on this DLCI to that address The local MAC address must be unique with only DLCI mapping for a specific MAC address local_mac is a standard MSB token ring MAC address remote_mac is the remote MAC address mapping outgoing requests to the DLCI value The remote MAC address must be unique with only DLCI mapping for a specific MAC address remote_mac is a standard MSB token ring MAC address For example the following command changes
18. has been set by an XID information exchange procedure Enter any valid value from 1 to 127 LLC PDUs For sessions that do not negotiate XIDs SNA PU 2 0 and NetBIOS set the router Send Window to the minimum end station s receive window If the Send Window is too large end stations discard frames they receive outside their receive window Timers recover these frames and dropping these frames degrades performance For sessions that negotiate XIDs SNA PU 2 1 the Send Window sets dynamically during connection establishment The router uses the value specified here as an upper limit and negotiates downward Choose a value that is appropriate for the requirements of the applications LLC2 supports 1 3 6 1 4 1 18 3 5 1 6 2 1 23 Max Retry After TimeOut Protocols gt LLC2 gt Interfaces 10 retransmissions 1 to 10 Specifies the maximum number of times that a PDU can be sent following expiration of the ack timer for xmt or the reject timer Enter a valid value from 1 to 10 retransmissions Choose a value that is appropriate for the applications LLC2 supports 1 3 6 1 4 1 18 3 5 1 6 2 1 7 308635 14 20 Rev 00 Site Manager Parameters Parameter Ack Timer for Xmt Path Protocols gt LLC2 gt Interfaces Default 1 s Options 1 to 15 Function Specifies the amount of time in seconds during which the local LLC expects to receive e An acknowledgment for one or more outstanding I PDUs sent during the timer window e A
19. packet sequencing and error control Over wide area networks WANs the Synchronous Data Link Control SDLC protocol has traditionally met this need However in a LAN environment front end processors FEPs controllers and NetBIOS client server stations commonly use an LLC2 layer for this purpose To support communication among these devices you can add LLC2 interfaces to a router configuration SNA devices and NetBIOS PCs use LLC when they establish sessions through a LAN topology SNA and NetBIOS need LLC2 connection oriented circuits to provide higher layer sequencing and error control in bridged LAN environments LLC2 works much like SDLC for packet sequencing and acknowledgment Unlike SDLC it does not impose unbalanced primary secondary relationships between communicating nodes Any LLC station can initiate a peer to peer conversation with any other LLC station Supported Connections You configure LLC2 on any interface requiring local termination including e APPN interfaces e DLSw interfaces When you connect over an IP backbone in dual switch DLSw configurations the interface attached to the IP backbone does not use LLC2 When you connect over an LLC2 backbone in DLSw single switch configurations the interface attached to the backbone uses LLC2 e Token ring interfaces running LNM You can enable LLC2 on any LAN or WAN interface that supports APPN DLSw and LNM including e LAN interfaces Token ring Ethernet
20. plan for address Type of Number specifies the type of number the remote or local caller uses MAC Address Mapping Type LOCAL x121 Addr Sub Addr Numbering Plan Type of Number INTERNATIONAL Parameter Path Default Options Function Instructions MIB Object ID Figure A 1 LLC2 Frame Relay SVC Mapping Add Window MAC Address Configuration Manager gt Protocols gt LLC2 gt Frame Relay SVC Mappings None Standard MSB Token Ring MAC addresses Specifies the local or remote MAC address of the end station to be mapped Enter the MAC address you want to use 1 3 6 1 4 1 18 3 5 1 6 10 1 3 308635 14 20 Rev 00 A 3 Configuring LLC Services Parameter Path Default Options Function Instructions MIB Object ID Parameter Path Default Options Function Instructions MIB Object ID Parameter Path Default Options Function Instructions MIB Object ID Mapping Type Configuration Manager gt Protocols gt LLC2 gt Frame Relay SVC Mappings Local Local Remote Specifies whether this is a remote or local mapping Accept the default Local or choose Remote 1 3 6 1 4 1 18 3 5 1 6 10 1 4 X 21 Addr Configuration Manager gt Protocols gt LLC2 gt Frame Relay SVC Mappings None Any display string Specifies a WAN address e g X 121 E 164 that is registered with frame relay to accept an incoming call if the mapping is local or to establish an S
21. ring number for LLC to use if you configure APPN with source route bridging complete the following tasks Site Manager Procedure You do this System responds 1 In the Configuration Manager window The Protocols menu opens choose Protocols 2 Choose LLC2 The LLC2 menu opens 3 Choose Interfaces The LLC2 Interface Configuration window opens 4 Click on the interface you want to customize continued 308635 14 20 Rev 00 4 15 Configuring LLC Services Site Manager Procedure continued You do this 5 Set the Virtual Ring Number parameter Click on Help or see the parameter description on page A 18 System responds 6 Click on Apply 7 Click on Done The Configuration Manager window opens Configuring LLC2 Inbound Traffic Filters For descriptive and procedural information on inbound traffic filters for LLC and any other protocols that support this capability refer to Configuring Traffic Filters and Protocol Prioritization Deleting LLC2 from an Interface The following sections describe how to remove LLC2 from an interface using the BCC or Site Manager Using the BCC To delete LLC2 from a router interface navigate to the llc2 interface prompt for example box ethernet 2 1 Ilc2 and enter delete For example the following command removes LLC2 from a router interface 1lc2 ethernet 2 1 delete ethernet 2 1 4 16 308635 14 20 Re
22. that a connection through the data link layer has been established successfully e Enables a higher level protocol to govern LSDU activity by Sending or receiving LSDUs over an established data link layer connection Sequencing LSDUs sent over a data link layer connection Controlling the flow of LSDUs over a data link layer connection The LLC2 also performs the following services e Responds to a request from a higher level protocol to reset a connection to its initially connected state e Responds to a request from a higher level protocol to close an established connection 1 8 308635 14 20 Rev 00 Logical Link Control Overview e Notifies a higher level protocol that a connection previously established has been closed successfully Because the connection occurs in the data link layer rather than in higher layers LLC2 performs frame sequencing flow control and error recovery services for the data link layer LLC Operation Types LLC supports two operation types e Unnumbered unacknowledged type 1 e Numbered acknowledged type 2 LLC1 supports only type 1 operations LLC2 supports both type 1 and type 2 operations Type 1 Operations Type 1 operations have the following characteristics e LLCs exchange protocol data units PDUs without establishing a data link connection e The peer does not acknowledge the PDUs it receives e There are no mechanisms for PDU sequencing flow control or error re
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24. the maximum number of information PDUs that LLC can receive using the BCC or Site Manager Using the BCC To specify the maximum number of unacknowledged information PDUs that LLC can receive navigate to the Ilc2 interface prompt for example box ethernet 2 1 Ilc2 and enter receive window lt pdus gt pdus is the maximum number of unacknowledged information PDUs that LLC can receive The values are 1 to 127 For example the following command changes the maximum number of unacknowledged information PDUs to 10 llc2 ethernet 2 1 receive window 10 4 4 308635 14 20 Rev 00 Customizing LLC Services Using Site Manager To specify the maximum number of unacknowledged information PDUs that LLC can receive complete the following tasks Site Manager Procedure You do this System responds 1 In the Configuration Manager window The Protocols menu opens choose Protocols 2 Choose LLC2 The LLC2 menu opens 3 Choose Interfaces The LLC2 Interface Configuration window opens 4 Click on the interface you want to customize 5 Set the Receive Window parameter Click on Help or see the parameter description on page A 13 6 Click on Apply 7 Click on Done The Configuration Manager window opens Specifying the Maximum Number of Outstanding Information PDUs The following sections describe how to specify the maximum number of information PDUs that can be outstanding at any gi
25. to Configuring DLSw Services for descriptions of the parameters 11 Click on OK The Configuration Manager window opens Starting DLSw and LLC2 over Frame Relay BNN Because the BNN format does not carry the destination MAC address incoming LAN frames are delivered to the host in two ways e Using permanent virtual circuits PVCs e Using switched virtual circuits SVCs Using PVCs If you use PVCs to connect two devices over the network the router retrieves the destination MAC address from a frame relay mapping table The table has these fields e DLCI Represents a frame relay PVC e Remote MAC Represents the destination MAC address e Local MAC Represents a source MAC address There is one frame relay mapping table for each physical frame relay interface Each entry must have a value specified for the Local MAC Remote MAC or both Incoming LLC2 packets such as LAN packets are checked against the entries in this table If a match occurs the router forwards the frame only to the DLCI specified If no entry is found then the information is not forwarded out this interface as a BNN packet Using the BCC To configure DLSw and LLC2 on a frame relay BNN interface using PVCs you first configure DLSw global attributes Then you configure frame relay LLC2 and DLSw on that interface 3 12 308635 14 20 Rev 00 Starting LLC Services For example to configure DLSw and LLC2 on a frame relayBNN PVC inte
26. 0003 400000000003 101 LLCOO11A Figure 2 5 Frame Relay to Physical MAC Topology Frame Relay to Frame Relay Figure 2 6 illustrates a sample frame relay DLCI to frame relay DLCI mapping In this network the PC makes connection requests to both hosts 1 and 2 The workstation administrator has configured the PC with remote hosts 1 and 2 equal to the assigned DLCIs Router A requires a mapping table to map the remote host 1 and 2 DLCIs to a virtual MAC address corresponding to the host 1 or 2 DLCI Router A creates a connection request with the source MAC address equal to the virtual MAC address corresponding to the remote host 1 or 2 DLCI Router B creates a connection request with the destination MAC address equal to the local MAC address from the mapping table 2 10 308635 14 20 Rev 00 LLC2 Routed over Frame Relay Router A always sets the source MAC address equal to the virtual MAC address even if there is a remote MAC address configured in the mapping table Remote host 1 DLCI 102 Remote host 2 DLCI 103 DLCI 100 100 decimal 64 hex Frame relay L DLCI 101 Frame relay 101 decimal Router A ae Router B 65 hex Mapping Table for Router A Connectionreguest DLC Local MAC 102 400000FF0064 103 400000FF0065 No mapping Source MAC smac virtual Destination MAC dmac 400000FF0064 or 400000FFO065 LLCO012A Figure 2 6 Frame Relay to F
27. 1 Ilc2 and enter the following command disable For example to disable LLC2 on an Ethernet interface enter llc2 ethernet 2 1 disable ethernet 2 1 Using Site Manager To enable LLC2 on a router interface complete the following task Site Manager Procedure You do this System responds 1 In the Configuration Manager window choose Protocols The Protocols menu opens 2 Choose LLC2 The LLC2 menu opens 3 Choose Interfaces Click on the interface you want to customize The LLC2 Interface Configuration window opens Set the Enable parameter Click on Help or see the parameter description on page A 10 6 Click on Apply 7 Click on Done The Configuration Manager window opens 308635 14 20 Rev 00 4 3 Configuring LLC Services Configuring the Window Size In LLC a window controls how many frames a link station sends before receiving an acknowledgment Window size depends on which modulo your network s implementation of LLC uses Modulo 8 operation allows a maximum window size of 7 Modulo 128 a maximum of 127 For example with a window size of 7 a link station can transmit frames 0 through 6 before requiring acknowledgment from the receiving station The sending station will not send more frames until it receives an acknowledgment Specifying the Maximum Number of Received Information PDUs The following sections describe how to specify
28. 1c2 disable 1llc2 To reenable LLC2 navigate to the llc2 prompt and enter enable For example this command line reenables LLC2 on the router llc2 enable llc2 11 c2 info state enabled Using Site Manager To disable or reenable LLC2 on the router complete the following task Site Manager Procedure You do this System responds 1 In the Configuration Manager window The Protocols menu opens choose Protocols 2 Choose LLC2 The LLC2 menu opens 3 Choose Global The Edit LLC2 Global Parameters window opens 4 Set the Enable parameter Click on Help or see the parameter description on page A 10 5 Click on OK The Configuration Manager window opens Customizing an LLC2 Interface You customize LLC2 interface parameters for specific clients such as DLSw and LAN Network Manager LNM You can configure these and other LLC2 clients on the same physical circuits and therefore they can share the same LLC interfaces In such cases you can devise a profile of LLC2 parameter settings that satisfy the combined recommendations of the LLC2 clients 4 2 308635 14 20 Rev 00 Customizing LLC Services Disabling and Reenabling an LLC2 Interface The following sections describe how to disable and enable LLC on an interface using the BCC or Site Manager Using the BCC To disable or reenable LLC2 on an interface navigate to the Ilc2 interface prompt for example box ethernet 2
29. 2 10 Click on OK The ATM Service Record Parameter window opens 11 Click on Done The ATM Service Records List window opens 12 Click on Done The Edit ATM Connector window opens 13 Click on Done The Select Connection Type window opens 14 Click on Done The Configuration Manager window opens 308635 14 20 Rev 00 Starting LLC Services Starting DLSw and LLC2 over Frame Relay When configuring DLSw over frame relay IBM provides two types of frame relay support e Boundary Access Node BAN bridged format e Boundary Network Node BNN RFC 1490 or Routed SNA When configuring a frame relay interface for DLSw using Site Manager a message prompts you to select BAN PVC BNN PVC or BNN SVC Starting DLSw and LLC2 over Frame Relay BAN BAN frames use a standard RFC 1490 Bridged 802 5 over frame relay format Since this is a source routed frame you must enable SRB on a frame relay BAN interface The following sections describe how to configure DLSw and LLC2 over frame relay BAN using the BCC or Site Manager Note If you configure two token ring interfaces or a token ring interface and a frame relay BAN interface on a DLSw single switch the traffic between the two interfaces uses SRB not DLSw Using the BCC To configure DLSw and LLC2 on a frame relay BAN interface you first configure SRB and DLSw global attributes Then you configure frame relay SRB LLC2 and
30. 2 command PDUs and their counterpart response PDUs 1 10 308635 14 20 Rev 00 Table 1 1 LLC Command PDUs Logical Link Control Overview Operation Type Command Response Type 1 Type 2 Unnumbered information UI No response Exchange identification XID Exchange identification XID Test TEST Information I Test TEST Information I Receiver ready RR Receiver ready RR Receiver not ready RNR Receiver not ready RNR Reject REJ Reject REJ Set asynchronous balanced mode extended SABME Unnumbered acknowledgment UA Disconnect DISC Disconnected mode DM No command Frame reject FRMR Type 1 operations do not include definition of an acknowledgment PDU Type 2 operations do not include a command PDU counterpart for the FRMR response PDU LLC Protocol Data Unit Formats The LLC PDU contains fields for addressing control and data as shown in Figure 1 3 This section describes each field of the LLC PDU DSAP SSAP Control Information field 8 bits 8 bits 8 or 16 bits Variable 8 bits each packet Figure 1 3 LLC PDU Structure 308635 14 20 Rev 00 Configuring LLC Services Destination SAP DSAP The DSAP address field identifies one or more service access points SAPs for which the LLC PDU is intended The DSAP field contains 7 bits of actual address and 1 address designation bit to i
31. 308635 14 20 Rev 00 LLC2 Routed over Frame Relay Frame Relay to Physical MAC Figure 2 5 illustrates a sample frame relay DLCI to physical MAC mapping In this network hosts 1 and 2 can make connection requests to the PC The workstation administrator does not have control over the PC configuration and must use a configuration with real physical MAC addresses for the remote hosts Router B requires a mapping table to map the hosts 1 and 2 DLCIs to the PC MAC address Router B creates a connection request with the source MAC address equal to the virtual MAC address corresponding to the host 1 and 2 DLCIs Router B also creates a connection request with the destination MAC address equal to the local MAC address from the mapping table Router B always sets the source MAC address equal to the virtual MAC address even when a remote MAC address is configured in the mapping table Note This mapping does not work with applications that check the source MAC address against configured remote host addresses 308635 14 20 Rev 00 2 9 Configuring LLC Services Configuration at PC Remote host 1 400000000001 Remote host 2 400000000002 PC MAC 400000000003 DLCI 100 Frame relay DLCI 101 Router A Router B Connection request Mapping Table for Router B Remote MAC Local MAC DLCI Source MAC smac virtual 400000000003 100 Destination MAC dmac 40000000
32. 35 14 20 Rev 00 Configuring LLC Services Site Manager Procedure continued You do this 8 Set the APPN Local Node Name parameter Refer to Configuring APPN Services for a description of the parameter System responds 9 Click on OK The APPN FR Configuration window opens 10 Set the DLCI and SAP parameters Refer to Configuring APPN Services for descriptions of the parameters 11 Click on OK The Configuration Manager window opens 3 20 308635 14 20 Rev 00 Chapter 4 Customizing LLC Services When you start LLC on the router default values are in effect for all parameters Depending on the requirements of your network you may want to change some of these values This chapter includes the following information Topic Page Disabling and Reenabling LLC2 on the Router 4 1 Customizing an LLC2 Interface 4 2 Configuring LLC2 Inbound Traffic Filters 4 16 Deleting LLC2 from an Interface 4 16 Deleting LLC2 from the Router 4 18 Disabling and Reenabling LLC2 on the Router When you configure LLC2 all LLC2 default parameter are automatically enabled on the router If you disable LLC2 it is no longer available on the router Using the BCC To disable LLC2 on the router navigate to the Ilc2 global prompt and enter disable 308635 14 20 Rev 00 4 1 Configuring LLC Services For example the following command line disables LLC2 on the router 1
33. A 7 14 Click on OK The LLC2 Frame Relay PVC Mappings window opens 15 Click on Done The Configuration Manager window opens UsingSVCs If you use SVCs to connect two devices over the network it is unnecessary to preconfigure virtual circuits An SVC exists only when there is data to transfer For SVCs the frame relay switch assigns the DLCI number on a per call basis The Destination MAC address is mapped to a data network address X 121 or E 164 number address subaddress numbering plan and type of number You configure the numbering plan numbers for example X 121 or E 164 Each record contains one mapping and mapping type either local or remote Remote Mapping Use remote mapping to map a remote MAC address to a remote data network address DNA for outgoing calls Local mapping maps the called DNA in the incoming setup message to the local MAC address 308635 14 20 Rev 00 3 15 Configuring LLC Services If you configure only the remote mappings then the router can only initiate an SVC setup because the router cannot accept incoming calls The router accepts incoming calls from any MAC address to the destination MAC address configured in the mapping and establishes the SVC Local Mapping The router accepts the local DNA from the Frame Relay Service Record SVC configured in the mapping and establishes the SVC The local DNA from the Frame Relay Service Record SVC configuration serves as the so
34. BayRS Version 14 20 Part No 308635 14 20 Rev 00 September 2000 600 Technology Park Drive Billerica MA 01821 4130 Configuring LLC Services NORTEL NETWORKS Copyright 2000 Nortel Networks All rights reserved September 2000 The information in this document is subject to change without notice The statements configurations technical data and recommendations in this document are believed to be accurate and reliable but are presented without express or implied warranty Users must take full responsibility for their applications of any products specified in this document The information in this document is proprietary to Nortel Networks NA Inc The software described in this document is furnished under a license agreement and may only be used in accordance with the terms of that license The software license agreement is included in this document Trademarks NORTEL NETWORKS is a trademark of Nortel Networks AN BCN BLN and BN are registered trademarks and Advanced Remote Node ANH ARN ASN and BayRS are trademarks of Nortel Networks All other trademarks and registered trademarks are the property of their respective owners Restricted Rights Legend Restricted Rights Legend Use duplication or disclosure by the United States Government is subject to restrictions as set forth in subparagraph c 1 ii of the Rights in Technical Data and Computer Software clause at DFARS 252 227 7013 Notwithstanding any other li
35. CENSEE FURTHER AGREES THAT THIS AGREEMENT IS THE ENTIRE AND EXCLUSIVE AGREEMENT BETWEEN NORTEL NETWORKS AND LICENSEE WHICH SUPERSEDES ALL PRIOR ORAL AND WRITTEN AGREEMENTS AND COMMUNICATIONS BETWEEN THE PARTIES PERTAINING TO THE SUBJECT MATTER OF THIS AGREEMENT NO DIFFERENT OR ADDITIONAL TERMS WILL BE ENFORCEABLE AGAINST NORTEL NETWORKS UNLESS NORTEL NETWORKS GIVES ITS EXPRESS WRITTEN CONSENT INCLUDING AN EXPRESS WAIVER OF THE TERMS OF THIS AGREEMENT 308635 14 20 Rev 00 Contents Preface ery ey dogs 20 Ulm 2 ae anne ener eur reer ee reer tere ree ence ren eer rene errr erent er renee rrr xiii Text Conventions geuasanes seriais st beadaquadteesagunedesaagen T EO rO RE S IN pinia gzinceginedae xiv AOOO ad crisesiatresaialeeniaa une ieee xvi Hard Gopy Technical Manuals saiiinuieiniin naa a aiwiniadene xviii Fow To GEHE araci a aa aeda aeaa xviii Chapter 1 Logical Link Control Overview Using LLC2 with SNA and NetBIOS 00 praise bisis EA PE 1 2 Supported Conna CONS asc cressicseiesremeesinaeseehiae EEEE EE ENEA 1 2 Frame Relay Support AT Cer aE PE T E ere E or TE E ree ere re ee eer ey rere 1 3 Banndary Network Node siccccccctetecresisnuevercagntevtaddehersrscdgheabvsedaqmerprteanetvtaaducdievaalesliats 1 5 PUC SUPPO aiene 1 5 EVO SIEM saxees o atest naanetpeeh een eestnadeatimarees eee 1 5 Boundary Access NOGO csicusetsirenserimssniiendiiiinnes ER 1 6 MEG a ege E e e E a E E E EEATT 1 6 LLG GEmice CAS
36. DLSw on that interface For example to configure DLSw and LLC2 on a frame relay BAN interface over a serial line with default settings navigate in configuration mode to the top level box prompt 1 Configure DLSw global attributes box dlsw dlswi 2 Specify a slot for the IP interface and the IP address to use for TCP connections based on this slot For example to configure slot 3 with an IP address of 1 1 1 3 enter 308635 14 20 Rev 00 3 9 Configuring LLC Services 10 11 12 dlsw slot ip 3 ip addr 1 1 1 3 slot ip 3 Return to the box level prompt slot ip 3 box box Configure SRB global attributes box srb internal lan id 0x10 bridge id 0x15 srb Return to the box level prompt srb box Specify a serial interface on which you want to configure frame relay SRB LLC2 and DLSw box serial 3 1 serial 3 1 Configure frame relay on the serial interface serial 3 1 frame relay frame relay 3 1 Configure a service name for the frame relay interface frame relay 3 1 service service1 service servicel Configure SRB on the serial interface service service1 Srb interface ring id 0x30 srb servicel Configure LLC2 on the serial interface srb servicel Ile2 11c2 servicel Configure DLSw on the serial interface 1lc2 servicel dlisw dlsw servicel Display DLSw default settings dlsw servicel info 3 10 308635 14 20 Rev 00 Starting LLC Services Using Site
37. Figure 1 2 The LLC Sublayer in the IEEE 802 x and OSI Models You can add an IEEE 802 2 compliant LLC interface to any physical circuit attached directly to an 8802 x 802 x LAN segment Each interface services higher level clients networking protocols and applications and is serviced by lower level protocols MAC and physical layers operating within the router LLC Service Classes The 802 2 LLC recommendations support three service classes e Connectionless unacknowledged class 1 or LLC1 e Connection oriented class 2 or LLC2 e Connectionless acknowledged class 3 or LLC3 308635 14 20 Rev 00 1 7 Configuring LLC Services Note The Nortel Networks implementation of LLC does not support the LLC3 service class LLC1 Connectionless Service LLC1 is a datagram service that sends and receives LLC frames called link service data units LSDUs without requiring acknowledgment from the peer to assure delivery LLC1 supports all forms of communication point to point multipoint multicast and broadcast This service is appropriate for protocols that provide addressing routing recovery and sequencing services at a higher layer LLC2 Connection Oriented Service LLC2 secures point to point virtual circuit connections between link service access points LSAPs by acting as follows e Responds to a higher level protocol s request to open a connection through the data link layer e Notifies a higher level protocol
38. ID response PDU identifies the responding LLC and conveys to the source LLC e The types of LLC services the destination LLC supports e The receive window size the destination LLC supports per data link connection per virtual circuit Test OxF3 The TEST command PDU causes the destination LLC TEST or to respond with the TEST response PDU it performs a OxE3 loopback test of the LLC to LLC transmission paths The TEST command PDU also initiates the establishment of an LLC1 logical link across a network to another LLC entity The TEST response PDU confirms the establishment of an LLC1 link continued 308635 14 20 Rev 00 Logical Link Control Overview Table 1 4 Command Names and Definitions continued Control Command Field Response Value Definition Information I 6xxx0 The command PDU indicates to the destination LLC or e The sequence number for each command PDU xx even e The PDU sequence number the destination LLC expects next The command PDU also serves as an response PDU by indicating to the destination LLC that the source LLC has received PDUs up to a designated number from that destination LLC Receiver ready 01xx The RR command PDU indicates that the source LLC RR is ready to receive an PDU The sending LLC then considers PDUs sent prior to the RR condition as acknowledged Receiver not O05xx The RNR command PDU notifies the destination LLC ready that the o
39. Inactivity Timer A 17 Max Links A 17 Max Octets I PDU A 12 Receive Window A 13 Reject Timer A 16 Send Window A 14 Type of Number parameter A 5 types of operations numbered and unnumbered 1 9 1 10 Vv virtual MAC address mask A 18 virtual MAC to frame relay mapping 2 6 Virtual Ring Number parameter A 18 X X 21 Addr parameter A 4 Index 4 308635 14 20 Rev 00
40. Interac sriain n AEN RESE SE RO 4 2 Disabling and Reenabling an LLC2 Interface eeceeesceeceeeeeeeeeeeeeeeeeeeeeseneeeeaes 4 3 Contgunng the Mindon SIE see eee Peony eee er meer E e mre Mt rr rere TEER tre 4 4 Specifying the Maximum Number of Received Information PDUs 06 4 4 Specifying the Maximum Number of Outstanding Information PDUs Ad Specifying the Unnumbered Information and the Information PDU Size 4 6 Configuring Timers cccceeeeeeseeee E E A TE E E T 4 7 Specifying the Maximum Number of PDU Retries After Timeout eee i 4 9 Setting the Maximum Number of LLC2 Interface Connections ceeeee 4 10 Customizing LLC2 over Frame Relay ssciccassceccancasias iranse dada aiie 4 11 Configuring the Frame Relay Virtual MAC Address Mask nsee 4 11 Editing Frame Relay PVG Mappings sesesssseesseesssessreessssesrsrersrrnsernnrrensrrnnsrns 4 12 Editing Frame Relay SVC Mappings c ccsscciciccteciscececeatiscis pees acenteterearte eccrine 4 14 Configuring the LLC Virtual Ring Number for APPN with SRB neen 4 15 Configuring LEC2 Inbound Traffic FURGr Sassi cosas sccctsasseankpevscevesannsseusataarsdereneasiuses sevens 4 16 Deleting LLC2 from an Interface E A arois EP MERSE OTE TE 4 16 Set rig LLC2 from the ROU ET scrissenu aai aaa aN 4 18 Appendix A Site Manager Parameters Using the Parameter Descriptions sescsurnornsnrsnnnreanincnncnainnoania A Accessing LL
41. LC services Connection oriented protocols do not have a network layer address such as an IP subnet to route information Instead before any information transfer occurs a device on the network sends a broadcast or explorer frame to locate the session partner From this broadcast the network establishes a path for the data transfer LLC2 traffic is generally sensitive to excessive network delays causing problems with SNA and NetBIOS sessions Data link switching DLSw and Advanced Peer to Peer Networking APPN resolve these problems by locally terminating the LLC2 session at the router and providing a local acknowledgment to SNA NetBIOS workstations The LLC2 subsystem provides these services The Nortel Networks implementation of the LLC protocol consists of LLC Class 1 LLC1 a connectionless service and LLC class 2 LLC2 a connection oriented service The subsystems that require LLC2 services are as follows e DLSw e APPN e LAN Network Manager LNM Most other protocols use LLC1 or connectionless delivery services Generally there is no need to change the LLC2 default settings You can however tune the network by changing these default settings In Site Manager you should not select LLC2 on an interface without also selecting one of the preceding protocols 308635 14 20 Rev 00 1 1 Configuring LLC Services Using LLC2 with SNA and NetBIOS SNA needs a connection oriented data link layer for end to end
42. LC2 srb token ring 3 1 lle2 1llc2 token ring 3 1 308635 14 20 Rev 00 3 5 Configuring LLC Services Configuring LLC2 on an FDDI Interface To configure LLC2 on an FDDI interface with default settings in configuration mode navigate to the top level box prompt 1 Configure an FDDI interface For example enter box fddi slot 4 connector 1 fddi 4 1 2 Configure SRB on the interface For example enter fddi 4 1 srb interface ring id 0x1 srb fddi 4 1 3 Configure LLC2 srb fddi 4 1 Ile2 11 c2 ddi 4 1 Note LLC2 also is configured globally when you configure LLC2 on an interface Using Site Manager You can easily start LLC2 services using default values for all parameters If you decide to change some or all of the default values see the instructions in Chapter 4 To start LLC2 on an interface complete the following tasks Site Manager Procedure You do this System responds 1 In the Configuration Manager window The Select Protocols window opens select the link or network module connector on which you are enabling LLC2 services 2 Choose LLC2 The Configuration Manager window opens 3 6 308635 14 20 Rev 00 Starting LLC Services Starting LLC2 over ATM LANE The following sections describe how to configure LLC2 over ATM LAN emulation LANE using the BCC or Site Manager Using the BCC To configure LLC2 on an ATM LANE interface with default settings
43. MAC in the mapping table only if the frame relay interface receives connection requests Usually only local workstation nodes will request a connection so you configure only the remote MAC address Router Mapping Examples Some sample network configurations with associated mapping tables follow including e Virtual MAC to frame relay e Frame relay to virtual MAC e Physical MAC to frame relay e Frame relay to physical MAC e Frame relay to frame relay Although these network configurations illustrate topologies with two routers the same principles apply for DLSw operating in single switch mode Instead of configuring a single interface on each router you configure two interfaces on a single router 308635 14 20 Rev 00 2 5 Configuring LLC Services Virtual MAC to Frame Relay Figure 2 2 illustrates a sample virtual MAC address to frame relay DLCI mapping In this illustration the PC makes connection requests to hosts 1 and 2 The workstation administrator has control over the PC configuration and has configured the remote host addresses as virtual MAC addresses corresponding to the DLCIs assigned to the hosts Configuring the PC in this way simplifies the router configuration because a mapping table is not necessary in the frame relay attached router B The connection request received at router A will have a source MAC address of the PC MAC and a destination MAC address of remote host 1 or 2 Configuration at PC Remote ho
44. Manager When you select BAN PVC SRB is automatically enabled and you must configure it Specifically e If SRB has not been previously configured on the router the SRB Global Parameters window appears e The SRB Interface Parameters window appears For more information about configuring SRB see Configuring Bridging Services To enable DLSw and LLC2 over frame relay BAN complete the following tasks Site Manager Procedure You do this System responds 1 In the Configuration Manager window The Add Circuit window opens select the synchronous connector on which you are enabling DLSw services 2 Click on OK The WAN Protocols window opens 3 Choose Frame Relay 4 Click on OK The Select Protocols window opens 5 Choose DLSw When you choose DLSw you automatically choose LLC2 6 Click on OK The Frame Relay SNA Connection window opens 7 Click on BAN The DLSw Basic Global Parameters window opens 8 Set the following parameters SR Internal LAN ID e DLSw Virtual Ring ID hex e DLSw RFC Version e DLSw Peer IP Address dual switch networks only Refer to Configuring DLSw Services for descriptions of the parameters 9 Click on OK The DLSw Basic Interface window opens continued 308635 14 20 Rev 00 3 11 Configuring LLC Services Site Manager Procedure continued You do this System responds 10 Set SR Interface Ring ID and DLSw Slot IP Address Refer
45. O ParamietalS sosiumun nepina panaan E T is A 2 Add LLC2 Frame Relay SVC Mappings Parameters asrga asias EENE A 2 LLC2 Frame Relay SVC Mappings Parameters ccccccsceeeceeececeeeeeeeeeeaeeeneeeeaeenaees A 5 Add LLC2 Frame Relay PVC Mappings Parameters 0 cce EE beialiende A 6 LLC2 Frame Relay PVC Mappings Parameters a e AB LECZ Global PAU ost spas tatiana inde aul natant k i aiaa A 9 LLC2 Interface Parameters aD Aae n aaa ia rer aE ES A 10 308635 14 20 Rev 00 vii Appendix B Monitoring LLC Using the BCC show Commands SHIOIBS AIL serios E E E O B 2 SHOW llc2 interfaces eeeeeeseseeeeseeeerrerrrestrsnnrenettttiirnnt ttikian t unn nnnatnnknru naeun nnn nann nnen ennn na B 3 show llc2 links aoisean P E E E EE F er EE T E ee eee B 4 Sri WS SUNA e Gisianie akan ae Aa B 5 Index viii 308635 14 20 Rev 00 Figures Figure 1 1 Sample Frame Relay Network ccecscceseceeeeeeeeeeeeeeeeeeeeeeeeeeeneeeeeeaeeees 1 4 Figure 1 2 The LLC Sublayer in the IEEE 802 x and OSI Models cceeeeee 1 7 Figure 1 3 LLC PDU Structure iauna drissa RE E E EE E EA 1 11 Figure 1 4 DSAP Address Field soesesosseessussseesrressrssrrnerrsnerenssrenerenssrenseensresneens 1 12 Figure Po SSAP Address Field ssnirisiiiinnsueiiae iaai 1 13 Fowe te SAFS ere yrna anire n E ai ANAR SA 1 14 Figure 1 7 LLC PDU Control Field Format siiriorsnsrsinens iseni 1 16
46. ON THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE In addition the program and information contained herein are licensed only pursuant to a license agreement that contains restrictions on use and disclosure that may incorporate by reference certain limitations and notices imposed by third parties Nortel Networks NA Inc Software License Agreement NOTICE Please carefully read this license agreement before copying or using the accompanying software or installing the hardware unit with pre enabled software each of which is referred to as Software in this Agreement BY COPYING OR USING THE SOFTWARE YOU ACCEPT ALL OF THE TERMS AND CONDITIONS OF THIS LICENSE AGREEMENT THE TERMS EXPRESSED IN THIS AGREEMENT ARE THE ONLY TERMS UNDER WHICH NORTEL NETWORKS WILL PERMIT YOU TO USE THE SOFTWARE If you do not accept ii 308635 14 20 Rev 00 these terms and conditions return the product unused and in the original shipping container within 30 days of purchase to obtain a credit for the full purchase price 1 License Grant Nortel Networks NA Inc Nortel Networks grants the end user of the Software Licensee a personal nonexclusive nontransferable license a to use the Software either on a single computer or if applicable on a single authorized device identified by host ID for which it was originally acquired b to copy the Software solely for backup purposes in support of authorized use of
47. R over FR End station End station a L E b ETS LLC0013A Figure 2 7 RFC 1490 Bridging and Routing Standards for SNA 2 12 308635 14 20 Rev 00 Chapter 3 Starting LLC Services This chapter describes how to create a basic LLC configuration by specifying values for required parameters only and accepting default values for all other parameters of LLC Topic Page Starting Configuration Tools 3 2 Starting LLC2 on a Router 3 4 Starting LLC2 over ATM LANE 3 7 Starting DLSw and LLC2 over Frame Relay 3 9 Starting APPN and LLC2 over Frame Relay 3 19 When you start LLC2 over frame relay with APPN and DLSw you must specify the frame relay mapping parameters yourself while the Configuration Manager sets default values for all the rest For background information about LLC see Chapter 1 To customize LLC by changing default values see Chapter 4 To change the default settings see Appendix A Site Manager Parameters To obtain LLC data from the management information base MIB see Appendix B Monitoring LLC Using the BCC show Commands 308635 14 20 Rev 00 3 1 Configuring LLC Services Starting Configuration Tools Before configuring LLC services refer to the following user guides for instructions on how to start and use the Nortel Networks configuration tool of your choice Configuration Tool User Guide Bay Command Console BCC Using the Bay Comman
48. Relay Mappings window A 9 LLC2 Global Parameters window A 9 LLC2 Interface Configuration window A 11 LLC2 on a router starting 3 4 LLC2 over ATM Lane starting 3 7 Local MAC parameter A 8 Logical Link Control LLC and SNA protocols 1 2 classes of service in 1 7 to 1 9 functionality of 1 10 overview of 1 1 protocols requiring 1 1 types of operations in 1 9 MAC Address parameter A 3 MAC addresses real and virtual 2 4 mapping DLCIs to MAC addresses 2 4 to 2 11 Mapping Type parameter A 4 mask for frame relay MAC address A 18 Max Links parameter A 17 Max Octets in I parameter A 12 Max Octets in UI parameter A 12 Max Retry After Time Out parameter max number of transmissions A 14 NCP compatibility 2 2 Numbering Plan parameter A 5 0 operation types numbered acknowledged type 2 1 9 1 10 unnumbered unacknowledged type 1 1 9 overview of LLC services supported 1 1 308635 14 20 Rev 00 P parameter Type of Number A 5 parameters Ack Timer for Xmt A 15 Busy Timer A 16 DLCI A 7 Enable global A 10 Enable interface A 11 Frame Relay Virtual MAC Address Mask A 18 Inactivity Timer A 17 Local MAC A 8 MAC Address A 3 Mapping Type A 4 Max Links A 17 Max Octets in I A 12 Max Octets in UI A 12 Max Retry After Time Out max number of transmissions A 14 Numbering Plan A 5 Receive Window A 13 Reject Timer A 16 Remote MAC A 8 Send Windo
49. Rev 00 A 5 Configuring LLC Services 52 MAC 0x12 lt r Mapping Type LOCAL x121 Addr Sub Addr Numbering Plan Type of Number INTERNATIONAL Figure A 2 LLC2 Frame Relay SVC Mappings Add LLC2 Frame Relay PVC Mappings Parameters The LLC2 Frame Relay PVC Mapping Add window Figure A 3 contains the following parameters e DICI number of the virtual circuit to which you map the local or remote MAC address e Remote MAC address that maps outgoing requests to the DLCI value e Local MAC address that maps incoming requests on this DLCI to this address A 6 308635 14 20 Rev 00 Site Manager Parameters LLC2 Frame Relay Mapping Add Cancel OK Values Help DLCI 101 Remote MAC 400000F F0064 Local MAC 4000000000039 Figure A 3 LLC2 Frame Relay PVC Mapping Add Window Parameter DLCI Path Configuration Manager gt Protocols gt LLC2 Default None Options Standard Data Link Connection Identifier numbers Function Provides the number of the virtual circuit to which you are mapping the local or remote MAC address Instructions Enter a decimal DLCI number assigned by your system administrator or frame relay provider MIB Object ID 1 3 6 1 4 1 18 3 5 1 6 9 1 3 308635 14 20 Rev 00 A 7 Configuring LLC Services Parameter Remote MAC Path Configuration Manager gt Protocols gt LLC2 gt Frame Relay Mapping Default None Options Standard MSB Token Ring MAC addresses Fu
50. S OS cirio a a aN sieeiiatzs iae 1 7 LECT Connecionloss Serice srraranina a call aae eet 1 8 LLC2 Connection Oriented Service sass ccsccscsscazecesceesgscuseapsiaieetnransseasstsussacetmenanceiane 1 8 LLC Operation Types err aae eaaa EE E ET 1 9 aE E fe e E A E TE A E EN EEE E EN E T 1 9 Pps LOPAURE acna ada saiee ete hae 1 10 DEG Fun ONA ana a sree eels Genet pee tusete ta ibid 1 10 LEG Protocol Data Unit Formats sirarite aia aaka aee 1 11 BDestineatoh SAP DOARP caricia Aeee EAE EE E OAA 1 12 Sure SAP SONP e aa peter RETEA ETA A 1 12 SAP Addressing Scheme ccesccceescceeeseeeeeseeeeenees eee Spied segs ein ee E ES 1 13 Control Fielies ae aaaea a eia iaeiiai aiia 1 15 308635 14 20 Rev 00 v CGmtolFisid Formale cates ccs sirtni A R A E 1 16 Wiormaion Fiad ssa rs tree tart ere ee rrr ter teeer ter errr rere et eere rrr terre 1 21 Chapter 2 LLC2 Routed over Frame Relay Compatibility with RFC 1490 isciani ianea eee eee eerie 2 1 Compatibility with IBM NCP 7 1 and Later 0 r E 2 2 FRAD ik FUNnGIONAIIY croni aa E 2 4 Mapping DLCIs to MAC Addresses ccccceceesetteeseeteeseneeeeeaeees Danon 2 4 Router Mapping Examples T ME E E E 2 5 Virtual MAC to Frame Relay sessin ainina aaan aninion icad arai 2 6 Frame Relay to Virtual MAC ssassn E T E ET maces 2 7 Physical MAC t Frame Relay roroosnenirnni ieren E aa 2 8 Fame Relay to Physical MAC sssrisiosssssreinuinstansinsnnieinindani
51. VC initiate the call to the configured number if the mapping is remote Enter the X 21 address you want 1 3 6 1 4 1 18 3 5 1 6 10 1 5 Sub Addr Configuration Manager gt Protocols gt LLC2 gt Frame Relay SVC Mappings None Any display string Specifies the outbound calling or called party subaddress which is also the inbound calling or called party subaddress Enter the number 1 3 6 1 4 1 18 3 5 1 6 10 1 6 A 4 308635 14 20 Rev 00 Site Manager Parameters Parameter Numbering Plan Path Configuration Manager gt Protocols gt LLC2 gt Frame Relay SVC Mappings Default X 121 Options E 1641X 121 Function Specifies whether this SVC uses the E 164 or X 121 number plan for addresses Instructions Choose the numbering plan that applies to your network MIB Object ID 1 3 6 1 4 1 18 3 5 1 6 10 1 7 Parameter Type of Number Path Configuration Manager gt Protocols gt LLC2 gt Frame Relay SVC Mappings Default International Options Unknown International Function Specifies the type of number the remote or local caller uses Instructions To allow the caller to use an international type accept the default International MIB Object ID Otherwise choose Unknown 1 3 6 1 4 1 18 3 5 1 6 10 1 8 LLC2 Frame Relay SVC Mappings Parameters The LLC2 Frame Relay SVC Mappings window Figure A 2 allows you to edit and delete frame relay SVC mappings that you previously configured 308635 14 20
52. cense agreement that may pertain to or accompany the delivery of this computer software the rights of the United States Government regarding its use reproduction and disclosure are as set forth in the Commercial Computer Software Restricted Rights clause at FAR 52 227 19 Statement of Conditions In the interest of improving internal design operational function and or reliability Nortel Networks NA Inc reserves the right to make changes to the products described in this document without notice Nortel Networks NA Inc does not assume any liability that may occur due to the use or application of the product s or circuit layout s described herein Portions of the code in this software product may be Copyright 1988 Regents of the University of California All rights reserved Redistribution and use in source and binary forms of such portions are permitted provided that the above copyright notice and this paragraph are duplicated in all such forms and that any documentation advertising materials and other materials related to such distribution and use acknowledge that such portions of the software were developed by the University of California Berkeley The name of the University may not be used to endorse or promote products derived from such portions of the software without specific prior written permission SUCH PORTIONS OF THE SOFTWARE ARE PROVIDED AS IS AND WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES INCLUDING WITHOUT LIMITATI
53. covery because higher level protocols perform these services 308635 14 20 Rev 00 1 9 Configuring LLC Services Type 2 Operations Type 2 operations have the following characteristics e The LLC and its peer must establish a data link layer virtual circuit connection prior to any exchange of data e The source and destination are peer LLCs in an asynchronous balanced data link connection e The source and destination LLCs control traffic by means of a numbering scheme for the sequential transfer of PDUs The PDUs for each virtual circuit connection have independent sequence numbering schemes e The destination LLC acknowledges data PDUs that the source LLC sends by informing the source LLC of the next sequence number expected LLC Functionality The LLC sublayer which can support multiple logical links concurrently e Initiates and terminates control signal interchange with the XID TEST SABME and DISC PDUs e Organizes data flow with the U I and UA PDUs The level of organization differs between type 1 and type 2 operations e Interprets command PDUs it receives and generates appropriate response PDUs which differ between type 1 and type 2 operations and LLC1 and LLC2 service e Manages error control and recovery with the REJ RR RNR and FRMR PDUs The LLC protocols generate and interpret command packets or frames called protocol data units PDUs which Table 1 1 describes Table 1 1 lists type 1 and type
54. d Console BCC Site Manager Configuring and Managing Routers with Site Manager These guides also describe generically how to create or modify a device configuration LLC2 Configuration Hierarchy Figure 3 1 shows the hierarchy of LLC objects and the relationship between objects The atm frame relay ethernet token ring and fddi objects are interfaces on which you can configure LLC box disw rong disw LLCO016A Figure 3 1 LLC2 Configuration Hierarchy continued next page 3 2 308635 14 20 Rev 00 Starting LLC Services atm lec service service mct1 logical line frame relay default service service frame relay default service service frame relay default service LLC0017A Figure 3 1 LLC2 Configuration Hierarchy continued 308635 14 20 Rev 00 3 3 Configuring LLC Services Starting LLC2 on a Router With frame relay in native mode and source route bridging you can configure only one LLC2 interface per physical circuit with routed frame relay you can configure more than one LLC2 interface per physical circuit depending on your system s resources When you configure an LLC2 interface on an 802 x LAN physical LAN attachment circuit you supply information required by the MAC and LLC sublayers Using the BCC The following sections describe how to configure LLC2 on the router Configuring LLC2 Globally To configure LLC2 on the router with defaul
55. e or their successors whichever is applicable 6 Use of Software in the European Community This provision applies to all Software acquired for use within the European Community If Licensee uses the Software within a country in the European Community the Software Directive enacted by the Council of European Communities Directive dated 14 May 1991 will apply to the examination of the Software to facilitate interoperability Licensee agrees to notify Nortel Networks of any such intended examination of the Software and may procure support and assistance from Nortel Networks 7 Term and termination This license is effective until terminated however all of the restrictions with respect to Nortel Networks copyright in the Software and user manuals will cease being effective at the date of expiration of the Nortel Networks copyright those restrictions relating to use and disclosure of Nortel Networks confidential information shall continue in effect Licensee may terminate this license at any time The license will automatically terminate if Licensee fails to comply with any of the terms and conditions of the license Upon termination for any reason Licensee will immediately destroy or return to Nortel Networks the Software user manuals and all copies Nortel Networks is not liable to Licensee for damages in any form solely by reason of the termination of this license 8 Export and Re export Licensee agrees not to export directly or indirect
56. e switch configuration similar to a standalone Frame Relay Access Device FRAD 308635 14 20 Rev 00 2 1 Configuring LLC Services Compatibility with IBM NCP 7 1 and Later LLC2 routed over a frame relay BNN network is fully compatible with IBM NCP 7 1 and later and with existing or new IBM equipment The service has passed IBM interoperability testing You can use it without upgrading your LAN based downstream physical units DSPUs or network type such as APPN or IP DSPUs attached to the router retain full visibility for IBM NetView management The router passes through all NetView commands for the DSPUs and any alerts generated by the DSPUs You can configure a network without a router at the host if the communications controller is directly attached to a frame relay network Some terminals can also connect directly to the frame relay network without a router Frame relay networks save the expense of leased lines Additional savings accrue because one port on a communications controller can support hundreds of data link connection identifiers DLCIs Nortel Networks interoperates with NCP 7 1 and later with software only eliminating the need for any new hardware or upgrades to existing SNA terminals or router equipment Figure 2 1 illustrates the connection of an SNA host through a frame relay network in a configuration with multiprotocol traffic to other locations In addition to APPN token ring and IP traffic LLC can al
57. ection only after a client requests a session for example through sending a test poll e Disconnecting when an SVC is not in use e Mapping remote and local MAC addresses to E 164 or X 121 addresses e Directing multiple client connection requests to a single destination MAC address over a single SVC by modifying the source local service access point SAP SAPs are created at the receiving side and source MAC addresses are automatically created Boundary Access Node The Boundary Access Node BAN is an IBM router enhancement BAN refers to the RFC 1490 specification for bridged SNA over frame relay The associated IBM NCP 7 3 enhancement is called the Boundary Node Identifier BNI Since BAN carries the destination and source MAC addresses in the network packets this format carries more bits per packet Standard BAN uses the source route bridging frame format with local termination Nortel Networks routers select BAN when you configure the frame relay network with source route encapsulation LLC 8802 802 2 Standards The LLC protocols comply with the ITU T formerly CCITT 8802 2 standard and operate within the IEEE Project 802 x protocol stack Figure 1 2 compares LLC s location in the 802 x protocol stack to its equivalent position in the ISO OSI model 1 6 308635 14 20 Rev 00 Logical Link Control Overview ISO OSI model Application ne 802 2 LLC Data link MAC Physical Physical LLC0002A
58. edges the receipt and acknowledgment or acceptance of a SABME or DISC command PDU UA 63 relating to a specific data link connection to be opened or closed as appropriate for the type of command PDU it has received Disconnected 1F The DM response PDU indicates that the LLC sending mode DM or the response is logically disconnected from the data OF link connection Frame reject 97 The FRMR command PDU reports to the sending LLC FRMR or that an uncorrectable condition was detected in a 87 received frame The FRMR PDU includes an information field that indicates the reason for the PDU rejection The LLC receiving the FRMR PDU responds as follows e Initiates the appropriate mode setting e Initiates corrective action by reinitializing transmission in both directions on the data link connection using the SABME and DISC command PDUs as appropriate 1 20 308635 14 20 Rev 00 Logical Link Control Overview Information Field The contents of the information field depend on the type of PDU it appears in as follows The information field of an I format PDU contains only user data The information field of a UI command response PDU also contains only user data The information field of a TEST command response PDU is optional and contains a test pattern used for LLC loopback testing The information field of an XID command response PDU contains An 8 bit XID format identifier field A 16 bit paramete
59. er window opens Configuring Timers Four timers control how many seconds the local LLC waits to receive the following data Acknowledgment for an outstanding PDU Reply to a frame reject response PDU Indication from a remote LLC that it is ready to receive PDUs PDU soliciting the status of the remote LLC 308635 14 20 Rev 00 Configuring LLC Services Using the BCC To configure the LLC2 timers navigate to the Ilc2 interface prompt for example box ethernet 2 1 Ilc2 and enter the following parameters ack xmt timer lt seconds gt reject timer lt seconds gt busy timer lt seconds gt poll cycle timer lt seconds gt For ack xmt timer seconds is 1 to 15 for reject timer and poll cycle timer seconds is 1 to 30 for busy timer seconds is 1 to 60 For example the following command changes the values for the ack xmt timer and reject timer to 5 and the values for the busy timer and the poll cycle timer to 25 1lle2 ethernet 2 1 ack xmt timer 5 reject timer 5 busy timer 25 poll cycle timer 25 Using Site Manager To configure these timers complete the following tasks Site Manager Procedure You do this System responds 1 In the Configuration Manager window The Protocols menu opens choose Protocols 2 Choose LLC2 The LLC2 menu opens 3 Choose Interfaces The LLC2 Interface Configuration window opens 4 Click on the interface you want to customize 5 Set the Ack Timer for Xmt
60. h for the sections you need and print them on most standard printers Go to Adobe Systems at www adobe com to download a free copy of Acrobat Reader You can purchase selected documentation sets CDs and technical publications through the Internet at the www1 fatbrain com documentation nortel URL How to Get Help If you purchased a service contract for your Nortel Networks product from a distributor or authorized reseller contact the technical support staff for that distributor or reseller for assistance If you purchased a Nortel Networks service program contact one of the following Nortel Networks Technical Solutions Centers Technical Solutions Center Telephone EMEA 33 4 92 966 968 North America 800 2LANWAN or 800 252 6926 Asia Pacific 61 2 9927 8800 China 800 810 5000 An Express Routing Code ERC is available for many Nortel Networks products and services When you use an ERC your call is routed to a technical support person who specializes in supporting that product or service To locate an ERC for your product or service go to the www12 nortelnetworks com URL and click ERC at the bottom of the page xviii 308635 14 20 Rev 00 Chapter 1 Logical Link Control Overview LLC is a standard protocol within the ITU T formerly CCITT 8802 2 and IEEE 802 x family of LAN standards Connection oriented protocols including IBM Systems Network Architecture SNA and NetBIOS use L
61. he same LLC interfaces In such cases you can determine a compromise profile of LLC2 parameter settings that satisfy the combined recommendations of the LLC2 clients Note The Edit LLC2 Interface window has the same parameters as the LLC Interface Configuration window The Edit LLC2 Interface window shows only the circuit you have highlighted from the Circuit Definition window Refer to Configuring and Managing Routers with Site Manager for information on editing circuits A 10 308635 14 20 Rev 00 Site Manager Parameters LLC2 Interface Configuration E41 11c2 i Done E42 11c2 Delete bola ee i 2d 52 11c2 Apply Values Help Fn _ a a Enable ENABLE Max Octets in UI 5128 Max Octets in I 5128 Receive Window 7 Send Window Fa Max Retry After TimeOut 10 Figure A 6 LLC2 Interface Configuration Window Parameter Enable Path Protocols gt LLC2 gt Interfaces Default Enable Options Enable Disable Function Enables or disables the LLC2 interface added previously to this LAN physical circuit Instructions Select Enable if you disabled this LLC2 interface previously and now want to reenable the interface on its associated LAN physical circuit Select Disable if you want to disable this LLC2 interface on its associated LAN physical circuit MIB Object ID 1 3 6 1 4 1 18 3 5 1 6 2 1 2 308635 14 20 Rev 00 A 11 Configuring LLC Services Parameter Path Default Options Function In
62. her this SVC uses the E 164 or X 121 number plan for addresses The values are e164 and x121 The default is x121 type of number lt no _type gt no _type specifies the type of number the remote or local caller uses The values are international and unknown The default is international x121 addr lt x121_addr gt x121_addr specifies a WAN address that is registered with frame relay to accept an incoming call if the mapping is local or to establish an SVC to the configured number if the mapping is remote For example the following command changes the mapping type from local to remote fr svc 123456789012 Mapping type remote fr svc 123456789012 4 14 308635 14 20 Rev 00 Customizing LLC Services Using Site Manager To edit and delete frame relay SVC mappings that you previously configured complete the following tasks Site Manager Procedure You do this System responds 1 In the Configuration Manager window The Protocols menu opens choose Protocols 2 Choose LLC2 The LLC2 menu opens 3 Choose Frame Relay SVC Mapping The LLC Frame Relay SVC Mappings window opens 4 Click on the interface you want to customize 5 Set the parameters you want Click on Help or see the parameter descriptions beginning on page A 5 6 Click on Apply 7 Click on Done The Configuration Manager window opens Configuring the LLC Virtual Ring Number for APPN with SRB To specify a
63. i annenin 2 9 Frame Relay to Frame Relay cccccccccciectssacceenssace emreeearens eer Sipiri ere he danass 2 10 LLC2 over Frame Relay Routed versus Bridged cccceceeeeeeeeeeeeeeeeeeeeeeeeteaeeeeaes 2 12 Chapter 3 Starting LLC Services Starting Coniguratan TOOS sisi easing n aE E EE nance 3 2 LEC Comiguration PHerarehy aoc hc a ses titan seliairaceaasanedscleeses reide R iae kaS AEE REIRES 3 2 Starting LLC2 on a Router A ishi Adenia iania E 3 4 Conta urine LG GOBA orairinnti nana a E n 3 4 Configuring LLC2 on an Ethernet Interface cccceseceeeeeeeeeeeeeeeeeeeteeaeeeeaes 3 4 Configuring LLC2 on a Token Ring Interface sieenscags TR 3 5 Configuring LLC2 on an FDDI Interface sssssinsianciscnrsinsinirinonndaninannaninna 3 6 cang LLO over ATM LANE xciiaiiccs heed ce cantadsacsireasa eas R E S 3 7 Starting DLSw and LLG2 over Frame Relay cnecinuasniiiraiiiienii ia E 3 9 Starting DLSw and LLC2 over Frame Relay BAN eceeeeeseeeseeeeneeeseeeeeeseeeaes 3 9 Starting DLSw and LLC2 over Frame Relay BNN ccceseseeseseeeeeeeeeteteeetees ee a LSI PVC A ert aseiemuan asian T 3 12 WSS anaa Siadanin Lalanaestc tarsi bent ee 3 15 Starting APPN and LLC2 over Frame Relay cceeeeeeeeeeeees EE 3 19 vi 308635 14 20 Rev 00 Chapter 4 Customizing LLC Services Disabling and Reenabling LLC2 on the Router ccceseceseseeeeeeeeeteneeeeeseeeeeteeeeeaee 41 Customizing an LECZ
64. ic traverses a frame relay network BNN allows native SNA traffic originating from SDLC LAN or WAN attached devices to communicate over public or private frame relay networks directly with an SNA processor Devices can communicate with intermediate routing nodes or in a single switch configuration function as a Frame Relay Access Device FRAD PVC Support Since BNN does not carry the destination and source MAC addresses in the network packets the BNN format carries the fewest number of bits per packet and yields low network overhead Therefore you must explicitly define a permanent virtual circuit PVC to carry a packet to its destination You do this with the LLC2 frame relay mapping table The mapping table consists of three fields e DLCI which represents a frame relay PVC e Remote MAC which is the destination MAC address e Local MAC which is the source MAC address Each entry requires that you specify the Remote MAC Local MAC or both A packet that matches this entry is then forwarded to the specified data link connection identifier DLCID SVC Support Using a switched virtual circuit SVC is very similiar to the BNN PVC over frame relay implementation However rather than requiring PVCs to always be available you use an SVC to connect only when there is data to transfer 308635 14 20 Rev 00 1 5 Configuring LLC Services The following features are supported with the SVC implementation e Providing a conn
65. is warranty does not apply if the media has been damaged as a result of accident misuse or abuse The Licensee assumes all responsibility for selection of the Software to achieve Licensee s intended results and for the installation use and results obtained from the Software Nortel Networks does not warrant a that the functions contained in the software will meet the Licensee s requirements b that the Software will operate in the hardware or software combinations that the Licensee may select c that the operation of the Software will be uninterrupted or error free or d that all defects in the operation of the Software will be corrected Nortel Networks is not obligated to remedy any Software defect that cannot be reproduced with the latest Software release These warranties do not apply to the Software if it has been i altered except by Nortel Networks or in accordance with its instructions ii used in conjunction with another vendor s product resulting in the defect or iii damaged by improper environment abuse misuse accident or negligence THE FOREGOING WARRANTIES AND LIMITATIONS ARE EXCLUSIVE REMEDIES AND ARE IN LIEU OF ALL OTHER WARRANTIES EXPRESS OR IMPLIED INCLUDING WITHOUT LIMITATION ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE Licensee is responsible for the security of its own data and information and for maintaining adequate procedures apart from the Software to reconstruct lost or altered files da
66. le 1 3 Control Field Bits and FUNCIONS 3 icicc2cscdscsiec cde cickcomerssdconinecccctciniendiages 1 17 Table 1 4 Command Names and Definitions cccccccccccccceeceeesssssseeeeeeeeeeeeeees 1 18 Table A 1 Organization Of Parameters sesiisciccnardesccsminndes casiasoaaiaannddadadaiansercminnboncaann A 1 308635 14 20 Rev 00 xi Preface This guide describes Logical Link Control LLC services and what you do to start and customize LLC services on a Nortel Networks router By customizing your router for LLC services you open your network to LAN Network Manager LNM servers data link switching DLSw services and Advanced Peer to Peer Networking APPN You can use the Bay Command Console BCC or Site Manager to configure LLC on a router In this guide you will find instructions for using both the BCC and Site Manager Before You Begin Before using this guide you must complete the following procedures For a new router e Install the router see the installation guide that came with your router e Connect the router to the network and create a pilot configuration file see Quick Starting Routers Configuring BayStack Remote Access or Connecting ASN Routers to a Network Make sure that you are running the latest version of Nortel Networks BayRS and Site Manager software For information about upgrading BayRS and Site Manager see the upgrading guide for your version of BayRS 308635 14 20 Rev 00 xiii
67. ls 2 Choose LLC2 The LLC2 menu opens 3 Choose Interfaces The LLC2 Interface Configuration window opens 4 Click on the interface you want to customize continued 308635 14 20 Rev 00 4 9 Configuring LLC Services Site Manager Procedure continued You do this System responds 5 Set the Max Retry After TimeOut parameter Click on Help or see the parameter description on page A 14 6 Click on Apply 7 Click on Done The Configuration Manager window opens Setting the Maximum Number of LLC2 Interface Connections The following sections describe how to set the maximum number of LLC2 interface connections using the BCC or Site Manager Using the BCC To specify the maximum number of logically independent end to end connections that the local LLC2 interface can allocate navigate to the Ilc2 interface prompt for example box ethernet 2 1 Ilc2 and enter max links lt max_links gt max links is the number of end to end connections from 4 to 5000 For example the following command changes the number of end to end connections to 1000 1llc2 ethernet 2 1 max links 1000 4 10 308635 14 20 Rev 00 Using Site Manager Customizing LLC Services To specify the maximum number of logically independent end to end connections the local LLC2 interface can allocate complete the following tasks Site Manager Procedure You do this System responds 1
68. ly the Software or related technical data or information without first obtaining any required export licenses or other governmental approvals Without limiting the foregoing Licensee on behalf of itself and its subsidiaries and affiliates agrees that it will not without first obtaining all export licenses and approvals required by the U S Government i export re export transfer or divert any such Software or technical data or any direct product thereof to any country to which such exports or re exports are restricted or embargoed under United States export control laws and regulations or to any national or resident of such restricted or embargoed countries or ii provide the Software or related technical data or information to any military end user or for any military end use including the design development or production of any chemical nuclear or biological weapons 9 General If any provision of this Agreement is held to be invalid or unenforceable by a court of competent jurisdiction the remainder of the provisions of this Agreement shall remain in full force and effect This Agreement will be governed by the laws of the state of California Should you have any questions concerning this Agreement contact Nortel Networks 4401 Great America Parkway PO Box 58185 Santa Clara California 95054 8185 LICENSEE ACKNOWLEDGES THAT LICENSEE HAS READ THIS AGREEMENT UNDERSTANDS IT AND AGREES TO BE BOUND BY ITS TERMS AND CONDITIONS LI
69. m the MAC layer and directs them to the appropriate application or protocol software entity Figure 1 6 illustrates some SAPs published for NetBIOS and SNA The xx in the last column denotes all other published and unpublished SAPs 308635 14 20 Rev 00 1 13 Configuring LLC Services SNA NetBIOS path control LAN network managemt For LAN Used by DLSw attached devices and APPN LLCO00SA Figure 1 6 SAPs for LLC Clients SAP addresses are as follows Individual Designates a single SAP The individual address is usable as both an SSAP and a DSAP The individual SAP has an address designation bit value of 0 Group Designates a group of DSAPs The group DSAP has an address designation bit value of 1 Global Designates a group consisting of all DSAPs that the underlying MAC SAP addresses actively service The global DSAP has a value of all Is Null Designates the SAP of the underlying MAC sublayer and does not identify any SAP to either the network layer or to an associated layer management function The null address is usable as both an SSAP and a DSAP The null SAP has a value of all Os 308635 14 20 Rev 00 Logical Link Control Overview Control Field The control field consists of one or two octets that designate command and response functions It also contains sequence numbers when required The format of the control field of the LLC PDU defines the type of operation type 1 versus t
70. mer detects when an end station no longer responds The router uses the following formulas to recognize a nonresponsive LLC end station Inactivity Timer Ack Timer for Xmt Max Retry After TimeOut Defaults 30 1 10 40 seconds If you increase the Ack Timer for Xmt parameter value then you should consider decreasing the Inactivity Timer parameter value 1 3 6 1 4 1 18 3 5 1 6 2 1 18 Max Links Protocols gt LLC2 gt Interfaces 255 logical connections 4 to 5000 Specifies the maximum number of logically independent end to end connections the local LLC2 interface can allocate Enter any valid number of end to end connections from 4 to 5000 Choose an appropriate value for the aggregate performance requirements of all the applications that this LLC2 interface supports Be aware that higher settings reduce the amount of available memory 1 3 6 1 4 1 18 3 5 1 6 2 1 20 308635 14 20 Rev 00 Configuring LLC Services Parameter Path Default Options Function Instructions MIB Object ID Parameter Path Default Options Function Instructions MIB Object ID Frame Relay Virtual MAC Address Mask Protocols gt LLC2 gt Interfaces 0x400000FF Octal string This mask specifies the upper 2 to 4 bytes of a virtual destination MAC address The lower remaining bytes specify the DLCI to be used Select a mask that is unique within your network The mask should be the upper 2 to 4 bytes of a s
71. nction Provides the remote MAC address mapping outgoing requests to the DLCI value The remote MAC address must be unique with only DLCI mapping for a specific MAC address Instructions If you need to specify the real hardware address of the host enter it as an octal MIB Object ID string 1 3 6 1 4 1 18 3 5 1 6 9 1 5 Parameter Local MAC Path Configuration Manager gt Protocols gt LLC2 gt Frame Relay Mapping Default None Options Standard MSB Token Ring MAC addresses Function This parameter provides the local MAC address mapping incoming requests on this DLCI to that address The local MAC address must be unique with only DLCI mapping for a specific MAC address Instructions If the incoming connections are valid enter the MAC address of the recipient MIB Object ID 1 3 6 1 4 1 18 3 5 1 6 9 1 4 LLC2 Frame Relay PVC Mappings Parameters The LLC2 Frame Relay PVC Mappings window Figure A 4 allows you to edit and delete frame relay mappings that you previously configured A 8 308635 14 20 Rev 00 Site Manager Parameters S41 DLCI 7 Es Delete Apply Values Help 4 Ct rf Remote MAC 0x123456789012 Local MAC 0x111111111111 Figure A 4 LLC2 Frame Relay PVC Mappings Window LLC2 Global Parameters The Edit LLC2 Global Parameters window Figure A 5 lets you enable or disable LLC2 on the router Edit LLC2 Global Parameters Cancel OK Values Help Enable Figure A 5
72. nd connections per LLC service 308635 14 20 Rev 00 B 5 A Ack Timer for Xmt parameter A 15 acronyms Xvi address mapping 2 4 to 2 11 address mask A 18 addresses real and virtual 2 4 ATM LANE configuring using BCC 3 7 configuring using Site Manager 3 8 Boundary Access Node BAN 1 6 Boundary Network Node BNN 1 5 PVC Support 1 5 SVC Support 1 5 Busy Timer parameter A 16 C classes of service 1 7 to 1 9 connection oriented class 2 1 8 to 1 9 connectionless class 1 1 8 command PDUs disconnect DISC 1 20 exchange identification XID 1 18 frame reject FRMR 1 20 information I 1 19 receiver not ready RNR 1 19 receiver ready RR 1 19 reject REJ 1 19 set asynchronous balanced mode extended SABMEB 1 19 test TEST 1 18 unnumbered information UI 1 18 308635 14 20 Rev 00 Index configuring parameters in PDU control field 1 15 to 1 17 control field formats information I 1 15 to 1 17 supervisory S 1 15 to 1 17 unnumbered U 1 15 to 1 17 control field parameters poll final bit 1 16 1 17 receive sequence number bit 1 16 1 17 send sequence number bit 1 16 1 17 conventions text xiv customer support xviii D deleting LLC2 from a single interface using BCC 4 17 using Site Manager 4 17 from all interfaces using BCC 4 18 using Site Manager 4 18 disabling LLC2 services using BCC 4 1 using Site Manager 4 2 DLCI parameter A 7
73. ndicate an individual I destination address or a group G destination address as shown in Figure 1 4 Address designation bit DDDDDDD VG LLC0003A Figure 1 4 DSAP Address Field A value of 0 for the address designation bit indicates that the PDU is destined for an individual SAP A value of 1 for the address designation bit indicates that the PDU is destined for a group level SAP Source SAP SSAP The SSAP address field identifies the specific service access point that initiated the PDU The SSAP field contains 7 bits of actual address and 1 command response identifier bit to indicate that the LLC PDU is a command C PDU or a response R PDU as shown in Figure 1 5 1 12 308635 14 20 Rev 00 Logical Link Control Overview Command response identifier bit SSSSSSS5S C R LLCO0004A Figure 1 5 SSAP Address Field A value of 0 for the command response identifier bit indicates that the PDU is a Command PDU A value of 1 for the command response identifier bit indicates that the PDU is a Response PDU SAP Addressing Scheme All of the 802 2 LLC protocols provide a SAP addressing scheme that lets multiple applications and protocol entities in a single machine share a MAC address Popular network protocols such as LAN Network Manager NetBIOS and SNA all have published SAP addresses but any application can use a SAP to send or receive data via the LLC sublayer The LLC SAP function sorts frames coming up fro
74. ng DLSw Services for a description of the parameter 11 Click on OK The LLC2 Frame Relay SVC Mappings window opens 12 Click on Add The LLC2 Frame Relay SVC Mapping Add window opens continued 308635 14 20 Rev 00 Starting LLC Services Site Manager Procedure continued 13 You do this Set the following parameters e MAC Address Mapping Type X121 Addr SubAddrpage A 5 Numbering Plan Type of Number Click on Help or see the parameter descriptions beginning on page A 2 System responds 14 Click on OK The LLC2 Frame Relay SVC Mappings window opens 15 Click on Done The Configuration Manager window opens Starting APPN and LLC2 over Frame Relay To start APPN and LLC2 over frame relay complete the following steps Site Manager Procedure You do this System responds 1 In the Configuration Manager window select the synchronous connector on which you are enabling APPN The Add Circuit window opens This selects native routed frame relay for LLC2 2 Click on OK The WAN Protocols window opens 3 Choose Frame Relay 4 Click on OK The Select Protocols window opens 5 Choose APPN When you choose APPN you automatically choose LLC2 6 Click on OK The Source Route Encapsulation dialog box opens 7 Click on Cancel The APPN Local Node Name Configuration window opens continued 3086
75. nics Engineers IP Internet Protocol ISO International Standards Organization ITU T International Telecommunication Union Telecommunications sector formerly CCITT LAN local area network LANE LAN emulation LEC LAN emulation client LLC logical link control LNM LAN Network Manager xvi 308635 14 20 Rev 00 LSAP LSB LSDU MAC MSB NCP NetBIOS OSI PDU PPP PVC RFC RNR SABME SAP SDLC SNA SR SRB SSAP SVC WAN Preface link service access point least significant bit link service data unit media access control most significant bit Network Communications Program Network Basic Input Output System Open Systems Interconnection protocol data unit Point to Point Protocol permanent virtual circuit Request for Comment receiver not ready set asynchronous balanced mode extended service access point Synchronous Data Link Control Systems Network Architecture source routing source route bridging source service access point switched virtual circuit wide area network 308635 14 20 Rev 00 xvii Configuring LLC Services Hard Copy Technical Manuals You can print selected technical manuals and release notes free directly from the Internet Go to the support baynetworks com library tpubs URL Find the product for which you need documentation Then locate the specific category and model or version for your hardware or software product Use Adobe Acrobat Reader to open the manuals and release notes searc
76. or otherwise disclose to any third party the Software or any information about the operation design performance or implementation of the Software and user manuals that is confidential to Nortel Networks and its licensors however Licensee may grant permission to its consultants subcontractors and agents to use the Software at Licensee s facility provided they have agreed to use the Software only in accordance with the terms of this license 3 Limited warranty Nortel Networks warrants each item of Software as delivered by Nortel Networks and properly installed and operated on Nortel Networks hardware or other equipment it is originally licensed for to function substantially as described in its accompanying user manual during its warranty period which begins on the date Software is first shipped to Licensee If any item of Software fails to so function during its warranty period as the sole remedy Nortel Networks will at its discretion provide a suitable fix patch or workaround for the problem that may be included in a future Software release Nortel Networks further warrants to Licensee that the media on which the Software is provided will be free from defects in materials and workmanship under normal use for a period of 90 days from the date Software is first shipped to Licensee Nortel Networks will replace defective media at no charge if it is returned to Nortel Networks during the warranty period along with proof of the date of shipment Th
77. r field encoded to identify the LLC services supported plus the maximum receive window size The information field of an FRMR PDU contains the reason for PDU rejection by an LLC For more details on the FRMR PDU refer to ISO 8802HEEE Std 802 2 1989 308635 14 20 Rev 00 1 21 Chapter 2 LLC2 Routed over Frame Relay LLC2 connection oriented service in a Nortel Networks router supports frame relay with both data link switching DLSw and Advanced Peer to Peer Networking APPN based on RFC 1490 Compatibility with RFC 1490 RFC 1490 describes an encapsulation method for carrying internetworking traffic over a frame relay backbone The description covers both bridging and routing standards The Nortel Networks router implementation of LLC exceeds RFC 1490 SNA encapsulation in frame relay only by complying with the frame relay Forum s Protocol Encapsulation over Frame Relay Implementation Agreements The latter description not only defines how routed SNA traffic traverses a frame relay network but also adds RFC 1490 support for frame relay to DLSw and APPN This feature allows native SNA traffic originating from SDLC token ring or Ethernet attached devices to communicate over public or private frame relay networks directly with IBM 3745 or 3746 communications controllers It operates on all Nortel Networks routers that include a frame relay interface Devices can communicate with intermediate routing nodes or in a singl
78. rame Relay Topology 308635 14 20 Rev 00 2 11 Configuring LLC Services LLC2 over Frame Relay Routed versus Bridged Figure 2 7 illustrates a SNA over frame relay with source route bridging and b SNA over frame relay in native mode including routing through SDLC and Ethernet The frame relay link can be part of an alternate route to the token ring or other link Dotted lines indicate the path of LLC which passes through bridging but terminates at the router for more flexible routing RFC 1490 bridging standard RFC 1490 routing standard SNA mainframe VA A A VA A SNA mainframe G G IBM 3745 IBM 3745 6 communications communications controller controller running NCP running NCP 7 1 or higher i nee Frame relay network Router removes Nortel Networks router with single switch DLSw FR headers operating as FRAD l 1 Ethernet E I UR ern a Router encapsulates 7 I data in FR headers e si SS To remote sites I i LLC _ E I I I t I Iw S
79. response PDU for an unnumbered command PDU sent during the timer window e A response PDU with the F bit set Instructions Enter a valid value from 1 to 15 The default value 1s works with most environments but may be too small if the LLC connection is over frame relay a source route network with multiple hops or if the end station responds slowly to I Frames Choose a value that is appropriate for the applications LLC2 supports MIB Object ID 1 3 6 1 4 1 18 3 5 1 6 2 1 13 308635 14 20 Rev 00 A 15 Configuring LLC Services Parameter Path Default Options Function Instructions MIB Object ID Parameter Path Default Options Function Instructions MIB Object ID Reject Timer Protocols gt LLC2 gt Interfaces 1 s 1 to 30 Specifies the amount of time in seconds during which the local LLC expects to receive a reply to a REJ PDU frame reject response PDU If the reject timer expires and no reply has been received for the REJ PDU sent by the local LLC the local reject timer restarts and LLC retransmits the REJ PDU The total number of times that a specific REJ PDU can be retransmitted depends on the setting of the Max Retry After TimeOut parameter Enter any valid value from 1 to 30 The default value 1s works with most environments but may be too small if the LLC connection is over frame relay a source route network with multiple hops or if the end station responds slowly to I Frames
80. rface over a serial line with default settings navigate in configuration mode to the top level box prompt 1 Configure DLSw global attributes box dlisw dlsw Specify a slot for the IP interface and the IP address to use for TCP connections based on this slot For example to configure slot 3 with an IP address of 1 1 1 3 enter dlsw slot ip 3 ip addr 1 1 1 3 slot ip 3 Return to the box level prompt slot ip 3 box box Specify a serial interface on which you want to configure frame relay LLC2 and DLSw box serial 3 1 serial 3 1 Configure frame relay on the serial interface serial 3 1 frame relay frame relay 3 1 Configure a service name for the frame relay interface frame relay 3 1 service service1 service servicel Configure LLC2 on the serial interface service servicel llc2 llc2 servicel Configure the number of the virtual circuit to which you are mapping the local or remote MAC address For example 1lc2 service1 dilci 101 dlci 101 Configure the remote and local MAC addresses For example dlci 101 local mac 111111111111 remote mac 222222222222 dlci 101 308635 14 20 Rev 00 3 13 Configuring LLC Services 10 Return to the Ilc2 prompt 11 dlci 101 back 1l1c2 servicel Configure DLSw on the serial interface 1llc2 servicel disw dlisw servicel 12 Display DLSw default settings dlsw servicel info Using Site Manager To enable DLSw and LLC2 o
81. riginating LLC is busy and temporarily unable RNR to receive PDUs RNRs combined with RRs control flow between source and destination LLC interfaces Reject O9xx The REJ command PDU conveys a request to the REJ peer LLC to retransmit PDUs starting with the PDU that the REJ command designates Set asynchronous 7F The SABME command PDU establishes an LLC2 balanced mode or connection to the destination LLC The connection extended 6F operates in asynchronous balanced mode SABME If the destination LLC receives from its network layer a data link connect request the destination LLC responds to the SABME PDU with a UA PDU If the destination LLC receives from its network layer a data link disconnect request it does not send a UA PDU continued 308635 14 20 Rev 00 Configuring LLC Services Table 1 4 Command Names and Definitions continued Conirol Command Field Response Value Definition Disconnect DISC 53 The DISC response PDU closes an open connection or by initiating a SABME command The DISC PDU 43 informs the destination LLC that the source LLC is suspending the data link connection and the destination LLC should assume the disconnected mode Prior to acting on the DISC command the destination LLC must confirm the acceptance of the DISC command PDU by sending a UA response PDU PDUs sent previously but not acknowledged remain unacknowledged Unnumbered 73 The UA response PDU acknowl
82. rvice Receive Window Maximum number of unacknowledged information PDUs that LLC can receive Transmit Window Maximum number of information PDUs that can be outstanding at any given time Encapsulation The encapsulation technique that should be used by LLC default token ring csmacd source routing LLC2 Connections Table Circuit Name Circuit name assigned to the interface Dest MAC The MAC address of the remote station Src MAC The MAC address of the local station Dsap One or more SAPs for which the LLC PDU is intended Ssap The specific SAP that initiated the PDU 308635 14 20 Rev 00 show Ilc2 interfaces Monitoring LLC Using the BCC show Commands The show Ilc2 interfaces command displays general information about LLC2 interfaces including the current operational status and interface type This command allows for the following command filter flag and argument interfaces lt circuit name gt Displays information for the specified interface only The output includes the following information Circuit Name Circuit name assigned to the interface State State of the LLC service up down init initializing disabled or absent Max Links Maximum number of end to end connections per LLC service Receive Window Transmit Window Encapsulation Maximum number of unacknowledged information PDUs that LLC can receive Maxim
83. so route SDLC and Ethernet traffic 2 2 308635 14 20 Rev 00 LLC2 Routed over Frame Relay SNA host oO n ik IBM communications controller with NCP No router required Frame relay network Nortel Networks router with DLSw or APPN LLC007A Figure 2 1 Sample Frame Relay Network Using LLC2 308635 14 20 Rev 00 2 3 Configuring LLC Services FRAD like Functionality Token ring Ethernet and SDLC end stations communicate with a frame relay attached host via Frame Relay Access Devices FRADs The Nortel Networks router with DLSw operating in single switch mode has FRAD like capability supporting token ring Ethernet and SDLC end stations The router performs the following actions e Terminates the data link control level sessions e Strips the link level header off the SNA packet e Puts an RFC1490 LLC header on the SNA packet e Sends packets into the frame relay network Mapping DLClIs to MAC Addresses The frame relay network provides a number of permanent virtual circuits PVCs that connect devices attached to the same frame relay network Each virtual circuit is uniquely identified at each frame relay interface by a DLCI The frame relay interface allows either group or direct single assignment of DLCIs Group assignment allows many DLCIs per circuit direct assignment allo
84. st 1 400000FF0064 64 hex 100 decimal Remote host 2 400000FF0065 65 hex 101 decimal PC MAC 400000000003 Frame relay O SI DLSw Router A Router B gt Connection request Source MAC smac PC MAC Destination MAC dmac remote host 1 or 2 Figure 2 2 Virtual MAC to Frame Relay Topology DLCI 100 LLC0008A 2 6 308635 14 20 Rev 00 LLC2 Routed over Frame Relay Frame Relay to Virtual MAC Figure 2 3 illustrates a sample frame relay DLCI to virtual MAC address mapping In this network hosts 1 and 2 can make connection requests to the PC The workstation administrator has control over the PC configuration and has configured the remote host addresses as virtual MAC addresses corresponding to the DLCIs assigned to the hosts At router B a mapping table maps the hosts 1 and 2 DLCIs to the PC MAC address Router B first creates a connection request with the source MAC addresses equal to the virtual MAC address corresponding to the hosts 1 and 2 DLCIs Router B then creates a connection request with the destination MAC equal to the local MAC address from the mapping table Router B always sets the source MAC address equal to the virtual MAC address even when a remote MAC address is configured in the mapping table Configuration at PC Remote host 1 400000FF0064 64 hex 100 decimal Remote host 2 400000FF0065 65 hex 101 decimal PC MAC 400000000003
85. structions MIB Object ID Parameter Path Default Options Function Instructions MIB Object ID Max Octets in UI Protocols gt LLC2 gt Interfaces 5128 octets 1 to 5128 Specifies in octets the maximum size of an unnumbered information UI PDU that this LLC2 interface sends or receives Enter a valid value from 1 octet 8 bits to 5128 octets Choose a value that is appropriate for the applications LLC2 supports The LLC sublayer imposes no restrictions However all MAC sublayers must be capable of accommodating UI PDUs with information fields up to 128 octets in length 1 3 6 1 4 1 18 3 5 1 6 2 1 6 Max Octets in I Protocols gt LLC2 gt Interfaces 5128 octets 1 to 5128 Specifies in octets the size of an information I PDU that this LLC2 interface sends or receives Enter any valid value from 1 octet 8 bits to 5128 octets Choose a value that is appropriate for the applications LLC2 supports Refer to the various MAC descriptions to determine the precise value you should select for the given medium All MACs must be capable of accommodating I format PDUs with information fields up to 5128 octets in length 1 3 6 1 4 1 18 3 5 1 6 2 1 9 308635 14 20 Rev 00 Site Manager Parameters Parameter Receive Window Path Protocols gt LLC2 gt Interfaces Default 7 PDUs Options 1 to 127 Function Specifies a maximum number of unacknowledged information PDUs that LLC can receive
86. t settings in configuration mode navigate to the top level box prompt 1 Configure LLC2 box llc2 2 Display LLC2 default settings 11c2 info state enabled Configuring LLC2 on an Ethernet Interface To configure LLC2 on an Ethernet interface with default settings in configuration mode navigate to the top level box prompt 1 Configure an Ethernet interface For example enter box ethernet slot 2 connector 1 ethernet 2 1 2 Configure LLC2 ethernet 2 1 Ile2 1llc2 ethernet 2 1 3 4 308635 14 20 Rev 00 Starting LLC Services 3 Display LLC2 default settings 1lc2 ethernet 2 1 info srb ring id 0 fr virtual mask lt not_set gt max ui size 5128 max retries 2 ui ackwait timer 30 max info size 5128 n2 10 n3 1 ack xmt timer 1 reject timer 1 busy timer 60 local response acktimer 10 idle timer 120 poll cycle timer 30 max saps 255 max links 255 dup addr check disabled receive window 7 transmit window 7 encapsulation default dynamic window enabled high water reset normal state enabled Configuring LLC2 on a Token Ring Interface To configure LLC2 on a token ring interface with default settings in configuration mode navigate to the top level box prompt 1 Configure a token ring interface For example enter box token ring slot 3 connector 1 token ring 3 1 2 Configure SRB on the interface For example enter token ring 3 1 srb interface ring id 0x1 srb token ring 3 1 3 Configure L
87. ta or programs 4 Limitation of liability IN NO EVENT WILL NORTEL NETWORKS OR ITS LICENSORS BE LIABLE FOR ANY COST OF SUBSTITUTE PROCUREMENT SPECIAL INDIRECT INCIDENTAL OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES RESULTING FROM INACCURATE OR LOST DATA OR LOSS OF USE OR PROFITS ARISING OUT OF OR IN CONNECTION WITH THE PERFORMANCE OF THE SOFTWARE EVEN IF NORTEL NETWORKS HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES IN NO EVENT 308635 14 20 Rev 00 iii SHALL THE LIABILITY OF NORTEL NETWORKS RELATING TO THE SOFTWARE OR THIS AGREEMENT EXCEED THE PRICE PAID TO NORTEL NETWORKS FOR THE SOFTWARE LICENSE 5 Government Licensees This provision applies to all Software and documentation acquired directly or indirectly by or on behalf of the United States Government The Software and documentation are commercial products licensed on the open market at market prices and were developed entirely at private expense and without the use of any U S Government funds The license to the U S Government is granted only with restricted rights and use duplication or disclosure by the U S Government is subject to the restrictions set forth in subparagraph c 1 of the Commercial Computer Software Restricted Rights clause of FAR 52 227 19 and the limitations set out in this license for civilian agencies and subparagraph c 1 ii of the Rights in Technical Data and Computer Software clause of DFARS 252 227 7013 for agencies of the Department of Defens
88. tandard MSB token ring MAC address 1 3 6 1 4 1 18 3 5 1 6 2 1 26 Virtual Ring Number Protocols gt LLC2 gt Interfaces None Ox1 to Oxfff Indicates a ring number for LLC to use if you configure APPN with source route bridging The ring number must be unique in the SRB network Select a hexadecimal number from 0x1 to Oxfff that is unique in your SRB network 1 3 6 1 4 1 18 3 5 1 6 2 1 25 A 18 308635 14 20 Rev 00 Appendix B Monitoring LLC Using the BCC show Commands This appendix describes how to use the BCC show commands to obtain LLC data from the management information base MIB The type and amount of data displayed depends on the specific LLC information you want to view This appendix includes descriptions of the following show commands Command Page show Ilc2 all B 2 show Ilc2 interfaces B 3 show llc2 links B 4 show Ilc2 summary B 5 308635 14 20 Rev 00 B 1 Configuring LLC Services show Ilc2 all The show Ilc2 all command shows all the information you can display using the show Ilc2 interfaces show Ilc2 links and show Ilc2 summary commands This command does not use command filters flags The output includes the following information LLC2 Interfaces Circuit Name Circuit name assigned to the interface State State of the LLC service up down init initializing disabled or absent Max Links Maximum number of end to end connections per LLC se
89. the local and remote mac addresses to 111111111111 and 222222222222 respectively dlci 101 local mac 111111111111 remote mac 222222222222 dlci 101 Using Site Manager To edit and delete frame relay PVC mappings that you previously configured complete the following tasks Site Manager Procedure You do this System responds 1 In the Configuration Manager window The Protocols menu opens choose Protocols 2 Choose LLC2 The LLC2 menu opens 3 Choose Frame Relay Mapping The LLC Frame Relay PVC Mappings window opens 4 Click on the interface you want to customize 5 Set the Remote MAC and the Local MAC parameters Click on Help or see the parameter descriptions beginning on page A 6 6 Click on Apply 7 Click on Done The Configuration Manager window opens 308635 14 20 Rev 00 4 13 Configuring LLC Services Editing Frame Relay SVC Mappings Using the BCC To edit frame relay SVC mappings that you previously configured navigate to the Ilc2 fr svc interface prompt for example box serial 2 1 Ilc2 fr svc lt mac_addr gt and enter one or more of the following parameters mapping type lt map_type gt map_type specifies whether this is a remote or local mapping sub addr lt sub_adar gt sub_adar specifies the outbound calling or called party subaddress which is also the inbound calling or called party subaddress svc plan lt svc_plan gt svc_plan specifies whet
90. tion PDU Size Using the BCC The following sections describe how to specify the UI and I PDU size using the BCC or Site Manager To specify the UI and I PDU size navigate to the llc2 interface prompt for example box ethernet 2 1 Ilc2 and enter the following parameters max ui size lt ui_size gt max info size lt info_size gt ui_size is the maximum size in octets of an unnumbered information PDU this LLC2 interface sends or receives The values are 1 to 5128 4 6 308635 14 20 Rev 00 Customizing LLC Services info_size is the maximum size in octets of an information PDU this LLC2 interface sends or receives The values are 1 to 5128 For example the following command changes the maximum size of the UI and I PDU to 4000 and 3000 respectively 1lc2 ethernet 2 1 max ui size 4000 max info size 3000 Using Site Manager To specify the UI and I PDU size complete the following tasks Site Manager Procedure You do this System responds 1 In the Configuration Manager window choose Protocols The Protocols menu opens Choose LLC2 Choose Interfaces The LLC2 menu opens The LLC2 Interface Configuration window opens Click on the interface you want to customize Set the Max Octets in UI and the Max Octets in I parameters Click on Help or see the parameter descriptions beginning on page A 12 6 Click on Apply 7 Click on Done The Configuration Manag
91. um number of information PDUs that can be outstanding at any given time Encapsulation technique that LLC should use default token ring csmacd source routing 308635 14 20 Rev 00 Configuring LLC Services show Ilc2 links The show Ilc2 links command displays general information about connections on the router This command allows for the following command filter flag and argument interface lt circuit name gt Displays information about connections on the router for the specified interface only The output includes the following information Circuit Name Circuit name assigned to the interface Dest MAC The MAC address of the remote station Src MAC The MAC address of the local station Dsap One or more SAPs for which the LLC PDU is intended Ssap The specific SAP that initiated the PDU 308635 14 20 Rev 00 Monitoring LLC Using the BCC show Commands show llc2 summary The show Ilc2 summary command displays general information about LLC2 interfaces including current operational status interface type and number of max links configured This command also shows whether global LLC2 is enabled This command does not use command filters flags The output includes the following information Circuit Name Circuit name assigned to the interface State State of the LLC service up down init initializing disabled or absent Max Links Maximum number of end to e
92. urce DNA If you configure only the local mappings then the router cannot initiate the calls it can only accept incoming calls If you configure local and remote mappings then the router can initiate and accept the call for the connection Using the BCC To configure DLSw and LLC2 on a frame relay BNN interface using SVCs you first configure DLSw global attributes Then you configure frame relay LLC2 and DLSw on that interface For example to configure DLSw and LLC2 on a frame relay BNN SVC interface over a serial line with default settings navigate in configuration mode to the top level box prompt 1 Configure DLSw global attributes box disw dlsw 2 Specify a slot for the IP interface and the IP address to use for TCP connections based on this slot For example to configure slot 3 with an IP address of 1 1 1 3 enter alsw slot ip 3 ip addr 1 1 1 3 slot ip 3 3 Return to the box level prompt slot ip 3 box box 4 Specify a serial interface on which you want to configure frame relay SRB LLC2 and DLSw box serial 3 1 serial 3 1 3 16 308635 14 20 Rev 00 Starting LLC Services 5 Configure frame relay on the serial interface serial 3 1 frame relay frame relay 3 1 6 Configure a service name for the frame relay interface frame relay 3 1 service service1 service servicel 7 Configure an SVC on the service record service 4 1 svc options svc name svc1 svc options svcl 8
93. v 00 Using Site Manager Customizing LLC Services To delete an LLC2 interface from its associated physical circuit complete the following tasks Site Manager Procedure You do this System responds 1 In the Configuration Manager window choose Protocols The Protocols menu opens 2 Choose LLC2 The LLC2 menu opens 3 Choose Interfaces The LLC2 Interface Configuration window opens Choose the LLC2 interface you want to delete Click on Delete The system software deletes the LLC2 entry you selected and the entry disappears from the list of LLC2 interfaces Click on Done The Configuration Manager window opens 308635 14 20 Rev 00 Configuring LLC Services Deleting LLC2 from the Router The following sections describe how to remove LLC2 from a router entirely using the BCC or Site Manager Using the BCC To delete LLC2 services from the router entirely navigate to the llc2 global prompt and enter delete For example the following command removes LLC2 from the router 11c2 delete box Using Site Manager To delete LLC2 from a router entirely Site Manager Procedure You do this System responds 1 In the Configuration Manager window The Protocols menu opens choose Protocols 2 Choose LLC2 The LLC2 menu opens 3 Choose Delete LLC2 A confirmation window opens 4 Click on OK The Configuration Manager window
94. ven time using the BCC or Site Manager Using the BCC To specify the maximum number of information PDUs that can be outstanding sent or transmitted at any given time navigate to the Ilc2 interface prompt for example box ethernet 2 1 Ilc2 and enter transmit window lt pdus gt pdus is the maximum number of information PDUs that can be outstanding at any given time The value serves as a default Send Window size when no other size has been set by an XID information exchange procedure The values are 1 to 127 308635 14 20 Rev 00 4 5 Configuring LLC Services Using Site Manager For example the following command changes the maximum number of outstanding information PDUs to 10 1lle2 ethernet 2 1 transmit window 10 To specify the maximum number of information PDUs that can be outstanding at any given time complete the following tasks Site Manager Procedure You do this System responds 1 In the Configuration Manager window choose Protocols The Protocols menu opens 2 Choose LLC2 The LLC2 menu opens 3 Choose Interfaces The LLC2 Interface Configuration window opens 4 Click on the interface you want to customize 5 Set the Send Window parameter Click on Help or see the parameter description on page A 14 6 Click on Apply 7 Click on Done The Configuration Manager window opens Specifying the Unnumbered Information and the Informa
95. ver a frame relay BNN interface using PVCs complete the following tasks Site Manager Procedure You do this System responds 1 In the Configuration Manager window select the synchronous connector on which you are enabling DLSw services The Add Circuit window opens Click on OK The WAN Protocols window opens Choose Frame Relay Click on OK The Select Protocols window opens ay AJV N Choose DLSw When you choose DLSw you automatically choose LLC2 Click on OK The Frame Relay SNA Connection window opens Click on BNN PVC The DLSw Basic Global Parameters window opens Set the following parameters e DLSw Virtual Ring ID hex e DLSw RFC Version e DLSw Peer IP Address dual switch networks only Refer to Configuring DLSw Services for descriptions of the parameters Click on OK The DLSw Basic Interface window opens continued 308635 14 20 Rev 00 Starting LLC Services Site Manager Procedure continued You do this System responds 10 Set DLSw Slot IP Address Refer to Configuring DLSw Services for a description of the parameter 11 Click on OK The LLC2 Frame Relay PVC Mappings window opens 12 Click on Add The LLC2 Frame Relay PVC Mapping Add window opens 13 Set the following parameters e DLCI e Remote MAC e Local MAC Click on Help or see the parameter descriptions beginning on page
96. w A 14 Sub Addr A 4 Virtual Ring Number A 18 X 21 Addr A 4 PDU formats SAP addressing scheme for 1 11 to 1 14 physical MAC to frame relay addressing 2 8 product support xviii publications hard copy xviii PVC support 1 5 R Receive Window parameter A 13 Reject Timer parameter A 16 Remote MAC parameter A 8 response PDUs disconnected mode DM 1 20 exchange identification XID 1 18 information I 1 19 receiver ready RR 1 19 test TEST 1 18 308635 14 20 Rev 00 RFC 1490 frame relay standard 1 5 2 1 router omitting with mainframe and DSPUs 2 2 used as FRAD 2 1 2 4 S SAP addressing scheme global 1 14 group 1 14 individual 1 14 null 1 14 source SAP SSAP field in 1 13 Send Window parameter A 14 show commands B 1 source SAP SSAP field 1 13 Starting APPN and LLC2 over frame relay 3 19 Starting LLC2 over ATM LANE 3 7 starting LLC2 services and APPN over frame relay 3 19 using BCC 3 4 using Site Manager 3 6 Sub Addr parameter A 4 support Nortel Networks xviii supported media Ethernet 1 2 FDDI 1 2 native frame relay 1 2 source route bridging 1 2 synchronous 1 2 token ring 1 2 SVC support 1 5 1 6 T technical publications xviii technical support xviii Technician Interface A 2 text conventions xiv type 1 operation parameters maximum octets A 12 type 2 operation parameters Ack Timer for Xmt A 15 Busy Timer A 16 Index 3
97. ws only one The system administrator or frame relay provider assigns DLCIs To communicate with an IBM host you must associate the MAC address of your DSPU with a DLCI You can accomplish this task in one of two ways e Create a virtual MAC address formed by preceding the DLCI address such as 100 decimal with a unique mask such as Ox400000FF to make a valid MAC address for example 400000FF0064 Decimal 100 is 64 hexadecimal When the router receives an LLC frame from the DLSw network with a destination MAC dmac starting with the virtual MAC mask it can automatically translate it into a DLCI so no mapping table is needed at the frame relay interface e Use the end station s physical or locally configured MAC address In this case be aware that if you change your hardware or end station configuration you have to reconfigure the DLCI mapping table 2 4 308635 14 20 Rev 00 LLC2 Routed over Frame Relay When the router receives an LLC frame from the DLSw network with a dmac not starting with the virtual MAC mask the mapping table at the frame relay interface translates the dmac into a DLCI SDLC single switched over LLC does not require address mapping if a virtual MAC address is used to access the host But you still have to define DLCIs Usually you configure only the remote MAC in the mapping table setting it equal to the remote host MAC address A host may be an IBM mainframe You must configure the local
98. ype 2 e Information an I format PDU e Supervisory an S format PDU e Unnumbered a U format PDU Figure 1 7 shows the three control field formats 308635 14 20 Rev 00 1 15 Configuring LLC Services format PDU information transfer commands responses 1 8 2 1 B daa efe T S format PDU supervisory commands responses U format PDU unnumbered commands responses Send sequence number Receive sequence number Supervisory function bit Modifier function bit Reserved and set to zero Poll final bit LLCO006A Figure 1 7 LLC PDU Control Field Format Control Field Formats Table 1 2 further defines the purpose of the three PDU types where the specific format in the PDU control field determines the type 1 16 308635 14 20 Rev 00 Logical Link Control Overview Table 1 2 PDU Format and Function Format Function Information The format PDU performs a numbered information transfer in type transfer 2 operation Except for the UI TEST FRMR and XID command Format I response PDUs the format PDU is the only LLC PDU that can contain an information field Refer to Information Field later in this chapter for more details Supervisory The S format PDU performs data link supervisory control functions in format S type 2 operation such as acknowledging format PDUs requesting retransmission of format PDUs and requesting temporary suspension of format PDU transmission

Avaya Configuring LLC Services (308635-14.20 Rev 00) User's Manual

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