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3Com 2250 Switch User Manual

1. EI Ca EE a EIE EE You cannot preset the speed to 1000Mbps To run a port at 1000Mbps you must enable autonegotiation Flow control is enabled by default for the port When autonegotiation is enabled the 32 CHAPTER A CONFIGURING THE SWITCH Switch will automatically connect at 1000Mbps pro viding the connected device also supports this speed 1000Mbps connections are always full duplex Half duplex connections are only available for 10Mbps and 100Mbps settings CAUTION Before manually setting a port to A full duplex verify that the device connected to the port is also manually set to the same speed and duplex setting If connecting link partners are left to autonegotiate for a link manually set on this switch to full duplex they will always negotiate to half duplex resulting in a duplex mismatch This can result in a significant reduction in network performance If you are unsure of how to configure the speed duplex set ting simply enable autonegotiation for the port You cannot modify the speed duplex settings of ports D that are members of a trunk or aggregated link full duplex Inserting an SFP transceiver into a gigabit port disables the corresponding RJ 45 port even if no fiber cable is inserted i Supported SFP transceivers only operate at 1000Mbps Advanced Port Configuration Use the Advanced Port Configuration tab to set the Switch broadcast storm control and
2. Port 1 Desktop M m VLAN ID ID of the configured VLAN 1 4094 no leading zeroes m Name Name of the VLAN 1 to 32 characters m Ports Port identifier Sample VLAN Configurations To illustrate how you can segment network devices that are connected to the Switch the following sample configurations are provided Setting Up Two VLANs on the Same Switch Figure 18 illustrates how you can set up a simple VLAN on the Switch using desktop connections Figure 18 Desktop VLAN Configuration Endstations Endstations in VLAN 2 in VLAN 1 D Port 3 Baseline Switch 2250 Plus EIER EL N Port 26 Server Server inVLAN2 inVLAN 1 If you want to add ports 1 3 and 26 to VLAN2 as shown in Figure 18 so that the ports on the default VLAN1 and the ports on VLAN2 cannot communicate with each other do the following 1 Create a new VLAN and set the VLAN ID to 2 Refer to Creating a VLAN for instructions VLAN1 is the default VLAN and already exists 2 Set ports 1 3 and 26 to Desktop mode 3 Click Apply Configuring VLANs 35 Ports 1 3 and 26 now belong to VLAN2 and will not communicate with any other ports unless you add other ports to the VLAN or change the port configu ration Setting Up VLAN Across Two Switches This example explains how you can set up a VLAN across two Switches using uplink connections This enables ports that are member
3. To power on the Switch 1 Plug the power cord into the power socket on the rear panel of the Switch Refer to 7 Power Supply on page 12 for more information 2 Plug the other end of the power cord into a power outlet When the Switch is powered on the Power LED lights up If the Power LED does not light up refer to 5 Power LED on page 11 for more information Checking for Correct Operation After you power on the Switch it automatically per forms a power on self test POST During POST the Power LED on the front panel of the Switch flashes green When POST is complete the Power LED turns green If the Power LED turns yellow after POST it means that POST failed Table 6 summarizes the possible colors for the Power LED after POST Table 6 Possible Power LED Colors After POST Color State Green The unit is powered on and ready for use AN Color State Yellow Power on self test or loopback test failed This can happen if a ports or ports fail when the Switch was powered on Off The unit is not receiving power m Verify that the power cord is connected correctly and then try powering on the Switch again m If the Switch still does not operate con tact your 3Com network supplier If POST fails try the following m Power off the Switch and then power it on again Check the Power LED and see if POST was success fully completed m Reset the Switch See Resetting to Factory Defa
4. MAC Media Access Control A protocol specified by the IEEE for determining which devices have access to a network at any one time MAC address Media Access Control Address Also called the hard ware physical or Ethernet address A layer 2 address associated with a particular network device Most devices that connect to a LAN have a MAC address assigned to them as they are used to identify other devices on a network MAC addresses are 6 bytes long 62 GLOSSARY network ping A network is a collection of computers and other computer equipment that are connected for the pur pose of exchanging information or sharing resources Networks vary in size some are within a single room others span continents Packet Internet Groper An internet utility used to determine whether a particular IP address is online It is used to test and debug a network by sending out a packet and waiting for a response protocol RJ 45 server SFP A set of rules for communication between devices on a network The rules dictate format timing sequenc ing and error control A standard connector used to connect Ethernet net works The RJ stands for registered jack A computer on a network that is shared by multiple end stations Servers provide end stations with access to shared network services such as computer files and printer queues Small Form Factor Pluggable SFP Connectors are based on an open standard that enables
5. 57 1 657 0888 NNN NNN NN Country Telephone Number You can also obtain support in this region using the follow ing Spanish speakers enter the URL http lat 3com com lat support form html Portuguese speakers enter the URL http lat 3com com br support form html English speakers in Latin America should send e mail to lat_support_anc 3com com US and Canada Telephone Technical Support and Repair 1 800 876 3266 SAFETY INFORMATION Important Safety Information A Please read the following safety information carefully before installing the 3Com Baseline Switch 2250 Plus WARNING Installation and removal of the unit must be carried out by qualified personnel only If installing the Switch unit in a stack with other units the Switch unit must be installed below the narrower units and above the deeper units The unit must be connected to an earthed grounded outlet to comply with international safety standards Do not connect the unit to an AC outlet power supply without an earth ground connection The appliance coupler the connector to the unit and not the wall plug must have a configuration for mating with an EN60320 IEC320 appliance inlet The socket outlet must be near to the unit and easily accessible You can only remove power from the unit by disconnecting the power cord from the outlet This unit operates under SELV Safety Extra Low Voltage conditions accord
6. Link Activity 10 Module Active 11 Power 11 ink aggregation 36 ocal area network 61 G Gigabit Ethernet 60 M MAC address 61 media access control 61 monitoring traffic 38 mounting kit contents 13 using 14 H half duplex 60 I EEE 60 ETF 61 installing 13 P address auto configuration 29 modifying 29 setting 30 P defined 61 N network analyzer 38 network cables category 3 59 category5 59 category 5e 60 category6 60 network defined 62 P package contents 12 panels front 9 rear 12 password 66 INDEX changing 28 default blank 28 setting 28 physical features 9 port settings configuring 31 default settings 32 ports RJ 45 11 SFP 8 10 positioning 13 POST 16 poweringon 16 power on self test See POST protocol defined 62 R rack mounting 14 rear panel power supply 12 Recovery button 12 resetting to factory defaults 43 RJ 45 defined 62 ports 11 S server defined 62 SFP ports 8 10 SFP transceivers 18 approved supported 18 inserting 18 removing 19 spotchecks 19 subnet mask 62 switch defined 62 T TCP IP 61 defined 62 traffic 63 monitoring 38 troubleshooting 43 forgotten IP address 43 forgotten password 43 LED related issues 44 POST failed 17 trunking See link aggregation U user name default 28 V viewing status information 27 VLANs 32 creating 33 36 maximum supported 33 sample configurations 34
7. Standard DK2 1a or nte avant d installer le Baseline Switch 2250 Plus DK2 5a Switzerland The supply plug must comply with AVERTISSEMENT L installation et la d pose de ce SEV ASE 1011 groupe doivent tre confi s un personnel qualifi UK The supply plug must comply with BS1363 3 pin 13 amp and be fitted m Si vous entassez l unit Switch avec les unit s with a 5 A fuse which complies with BS1362 m The mains cord must be HAR or lt BASEC gt marked and be of type HO3VVF3GO 75 minimum Europe The supply plug must comply with CEE7 7 SCHUKO m The mains cord must be lt HAR gt or lt BASEC gt marked and be of type HO3VVF3GO 75 minimum SuperStack 3 Hub l unit 2900 doit tre install e en dessous des unit s Hub plus troites Ne branchez pas votre appareil sur une prise sect eur alimentation lectrique lorsqu il n y a pas de connexion de mise la terre mise la masse m Vous devez raccorder ce groupe une sortie mise la terre mise la masse afin de respecter les normes internationales de s curit Le coupleur d appareil le connecteur du groupe et non pas la prise murale doit respecter une config uration qui permet un branchement sur une entr e d appareil EN60320 IEC 320 m La prise secteur doit se trouver proximit de l appareil et son acc s doit tre facile Vous ne pouvez mettre l appareil hors circuit qu en d bran chant son cordon lectrique a
8. llt m Der Ger testecker der Anschlu an das Ger t nicht der Wandsteckdosenstecker mu einen gem EN 60320 IEC 320 konfigurierten Ger tee ingang haben m Die Netzsteckdose mu in der N he des Ger ts und leicht zug nglich sein Die Stromversorgung des Ger ts kann nur durch Herausziehen des Ger tenetzkabels aus der Netzsteckdose unterbro chen werden m Der Betrieb dieses Ger ts erfolgt unter den SELV Bedingungen Sicherheitskleinstspannung gem IEC 60950 Diese Bedingungen sind nur gegeben wenn auch die an das Ger t angeschlos senen Ger te unter SELV Bedingungen betrieben werden Stromkabel Dies muss von dem Land in dem es benutzt wird gepr ft werden Schweiz m Dieser Stromstecker mu die SEV ASE 1011Bestimmungen einhalten Europe m Das Netzkabel mu vom Typ HO3VVF3GO 75 Mindestan forderung sein und die Aufschrift HAR oder lt BASEC gt tragen Der Netzstecker muB die Norm CEE 7 7 erf llen SCHUKO WARNUNG Die Installation und der Ausbau des Ger ts darf nur durch Fachpersonal erfolgen LASERGER T DER KLASSE I Niemals ein bertragungslaser betrachten w hrend dieses eingeschaltet ist Niemals direkt auf die Faser ansnchl sse und auf die Faserkabelenden schauen w hrend diese eingeschaltet sind WARNUNG Die Verwendung von Steuerelementen oder die Anpassung von Leistungen und Verfahren in anderer als der hierin genannten Weise kann zu gef hrlichen Laseremissionen
9. 45 port on the connecting device For 1000BASE T operation 3Com recommends using Category 5e or 6 cables 18 CHAPTER 2 INSTALLING THE SWITCH Using SFP Transceivers The following sections describe how to insert and remove an SFP transceiver from an SFP slot ble You can remove them from and insert them into i SFP transceivers are hot insertable and hot swappa any SFP port without having to power off the Switch Approved SFP Transceivers The following list of approved SFP transceivers is cor rect at the time of publication m 3CSFP91 SFP SX m 3CSFP92 SFP LX To access the latest list of approved SFP transceivers for the Switch on the 3Com Corporation World Wide Web site enter this URL into your Internet browser http www 3com com i 3Com recommends using 3Com SFPs on the Switch If you insert an SFP transceiver that is not supported the Switch will not recognize it Inserting an SFP Transceiver To be recognized as valid the SFP transceiver must be one of the following m 1000BASE SX SFP transceiver Use this transceiver to connect the Switch directly to a multimedia fiber optic cable m 1000BASE LX SFP transceiver Use this transceiver to connect the Switch directly to a single mode fiber optic cable or to multimode fiber using a con ditioned launch cable within the Switch See Troubleshooting on page 43 r If the SFP transceiver is faulty it will not operate To insert an
10. If you modify any of these settings click Apply to save your changes Basic Port Configuration Use the Basic Port Configuration tab to enable and Figure 12 Basic Port Configuration Screen disable the port and its flow control settings and to Basic Port Configuration set the speed duplex of the port Number Status Flow Control Speed Duplex Enabled Enabled v Auto m The following options are available Enabled v Enabled Enabled Enabled Auto Auto m Number Physical port number l Enabled v Enabled v Enabled v Enabled Auto m Label Optional name for the port to help you identify the device connected to it For example if an access point is connected to this port you can e e label it aS Access Point ame Enabled Enabled Auto Enabled Enabled Auto Auto Auto Enabled Enabled Auto m Status Enables and disables the port E E d E e I EI EI EI EI E Enabled Enabled Auto m Flow Control Enables and disables flow control Enabled v Enabled v Auto on the port When flow control is enabled for the Enabled v Enabled v Aut port the Switch regulates the packet flow so that a sending device does not transmit more packets than a receiving device can process If flow control Speed Duplex for 1000 Mbps Connections is disabled packets may be dropped under certain periods of high traffic
11. SFP transceiver 1 Hold the transceiver so that the fiber connector is toward you and the product label is visible as shown in Figure 4 Ensure the wire release lever is closed in the upright position Figure 4 Inserting the SFP Transceiver um R LO Maa En Product label E Wire release Suitable slot on host Switch 2 Gently slide the transceiver into the SFP slot until it clicks into place CAUTION SFP transceivers are keyed and can be A properly inserted only one way If the transceiver does not click when you insert it remove it turn it over and then re insert it 3 Remove the plastic protective cover if fitted Connect the fiber cable The transceiver connects to the network using a duplex LC connector Attach a male duplex LC con nector on the network cable into the duplex LC con nector on the transceiver Connect the other end of the cable to a device fitted with an appropriate Gigabit Ethernet connection Check the Module Active LEDs on the front of the Switch to ensure that it is operating correctly Removing an SFP Transceiver Removing an SFP transceiver does not require power ing off the Switch To remove an SFP transceiver Performing Spot Checks 19 of a possible failure any problems can then be attended to when there will be least effect on users 3Com recommends periodically checking the items listed in Table 7 Table 7 Items to Check Item V
12. W Web interface accessing directly 24 accessing using Discovery 21 buttons 24 connecting 21 loggingon 22 menu 23 navigating 23 requirements for accessing 21 REGULATORY NOTICES FCC STATEMENT This equipment has been tested and found to comply with the limits for a Class A digital device pursuant to part 15 of the FCC rules These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the instructions may cause harmful interference to radio communications Operation of this equipment in a residential area is likely to cause harmful interference to radio communications in which case the user will be required to correct the interference at their own expense INFORMATION TO THE USER If this equipment does cause interference to radio or television reception which can be determined by turning the equipment off and on the user is encouraged to try to correct the interference by one or more of the following measures m Reorient the receiving antenna m Relocate the equipment with respect to the receiver m Move the equipment away from the receiver Plug the equipment into a different outlet so that equipment and receiver are on different branch circuits If necessary the user should consult the dealer or an experienced
13. for installing and setting up network equipment Consequently it assumes a basic working knowledge of LANs local area networks Diese Anleitung ist f r die Benutzung durch Netzwerkadministratoren vorgesehen die f r die Installation und das einstellen von Netzwerkkompo nenten verantwortlich sind sie setzt Erfahrung bei If release notes are shipped with your product and the information there differs from the information in this guide follow the instructions in the release notes Most user guides and release notes are available in Adobe Acrobat Reader Portable Document Format PDF on the 3Com World Wide Web site http www 3com com Conventions Table 1 and Table 2 list conventions that are used throughout this guide Table 1 Notice Icons Icon Notice Type Information note 1 Caution Warning Description Information that describes important features or instructions Information that alerts you to potential loss of data or potential damage to an application system or device Information that alerts you to potential personal injury Table 2 Text Conventions Convention Description Screen displays This typeface represents information as it appears on the screen The words enter and type When you see the word enter in this guide you must type something and then press Return or Enter Do not press Return or Enter when an instruction simply says type W
14. hot swap ping of various types of fiber optic and copper based transceivers into the host equipment subnet address An extension of the IP addressing scheme that allows a site to use a single IP network address for multiple physical networks subnet mask A subnet mask which may be a part of the TCP IP information provided by your ISP is a set of four numbers configured like an IP address It is used to create IP address numbers used only within a particu lar network as opposed to valid IP address numbers recognized by the Internet which must assigned by InterNIC subnet A network that is a component of a larger network switch A device that interconnects several LANs to form a single logical LAN that comprises of several LAN seg ments Switches are similar to bridges in that they connect LANs of a different type however they con nect more LANs than a bridge and are generally more sophisticated TCP IP Transmission Control Protocol Internet Protocol This is the name for two of the most well known protocols developed for the interconnection of networks Origi nally a UNIX standard TCP IP is now supported on almost all platforms and is the protocol of the Inter net TCP relates to the content of the data travelling through a network ensuring that the information sent arrives in one piece when it reaches its destina tion IP relates to the address of the end station to which data is being sent as wel
15. is currently displayed the following buttons may appear m Apply Click to save and apply any changes that you have made m Cancel Click to discard any unsaved changes m Help Click to display the context sensitive help information for the screen that is currently dis played The help pages provide information on the tasks that you can perform on each screen Port Status At the bottom of each screen is an image of the Switch s front panel which indicates ports that are currently in use To configure a port click the port on the image This takes you to the Basic Port Configuration tab where you can m Assign a name or label to the port m Enable or disable the port m Enable or disable flow control m Configure the speed duplex settings Accessing the Interface Without Using Discovery The Discovery application works by automatically detecting the IP address that is assigned to the Switch and then using that address to connect to the Web interface If you know the Switch s IP address you can access the Web interface without using Dis covery This section describes how to access the interface directly without using Discovery Accessing the Interface Without Using Discovery 25 DHCP Assigned IP Address If you set the IP address mode to DHCP check the DHCP server for the IP address that is assigned to the Switch and then use that IP address to access the Web interface For example if the DHCP ser
16. is off Verify that m The fiber cable is in good condition m The SFP module is correctly inserted m 3Com SFP module is being used Refer to Approved SFP Transceivers on page 18 for details m The equipment at the far end is installed and cor rectly configured The Link Activity LED is on but network perfor mance is poor If the Problem Persists 45 The Switch supports full duplex autonegotiation If m Product number and serial number printed on a the connected device does not support autonegotia label supplied with the unit tion ensure that it is configured for half duplex oper ation only If the connected device has autonegotiation disabled or overridden and is config ured as full duplex the Switch will configure the link as half duplex causing a mismatch that will reduce network performance when data is transmitting and receiving simultaneously on the same link m A brief description of the issue Ensure that the connected device has either m Autonegotiation enabled or m The ports are configured for half duplex operation All ports appear to show continual activity There may be broadcast storms on the network Remove port connections one at a time waiting a few seconds between each port If the LEDs go off after removing a port connection the device that was connected to that port is introducing an excessive amount of broadcast frames to the network Some pieces of network equipment operate by s
17. lower priority data It differentiates traffic into classes and prioritizes those classes automatically Traffic prioritization uses the multiple traffic queues that are present in the hardware of the Switch to ensure that high priority traffic is forwarded on a dif ferent queue from lower priority traffic and is given preference over that traffic This ensures that time sensitive traffic gets the highest level of service The 802 1D standard specifies eight distinct levels of priority O to 7 each of which relates to a particular type of traffic The priority levels and their traffic types are shown in the following table Table 3 Priority Levels for Traffic Types Priority Level Traffic Type 0 Best effort 1 Background 2 Standard spare 3 Excellent effort business critical 4 Controlled load streaming multimedia 5 Video interactive media less than 100 milliseconds latency and jitter 6 Voice interactive voice less than 10 milli seconds latency and jitter 7 Network control reserved traffic Forwarding of BPDU Packets Within an extended local area network that imple ments a spanning tree protocol topology switches communicate with each other using bridge protocol data unit BPDU packets If your network is implementing a spanning tree topology across multiples switches you can configure 3Com Baseline Switch 2250 Plus to forward or to block and discard bridge protocol data unit BPDU packets to another
18. of other ports in the stack To set up traffic monitoring you need to set an analy sis port the port that is connected to the analyzer and a monitor port the port that is to be monitored Once the pair is defined and you enable traffic moni toring the Switch takes all the traffic going in and out of the monitor port and copies it to the analysis port CAUTION The analyzer port should have a higher A bandwidth than the mirror port Otherwise the Switch may not be able to copy all traffic effectively during periods of high traffic To set up traffic monitoring for a port Connect a network analyzer to a port Access the Web interface and then click Traffic Mon itoring on the menu The Port Traffic Monitoring Screen appears On the Monitor Port menu select the port number that you want to monitor On the Analyzer Port menu select the port number to which you connected the network analyzer Traffic to and from the port selected in Monitor Port will be for warded to this port Figure 23 Port Traffic Monitoring Screen Port Traffic Monitoring All traffic transmitted and received on the monitor port will be copied to the analyser port Monitor Port NONE Analyser Port NONE M Mirror Type NONE v Only one port can be selected from the Mirror Form row which means that you can only monitor one port at any given time In Mirror Type select the type of packet that you want to monit
19. switch Switches that support the spanning tree protocol communicate with each other using BPDU packets The spanning tree protocol STP is a mechanism that prevents looping and broadcast storms A spanning tree uses the spanning tree algorithm to detect avail able communication paths between switches and to determine the best available path and block less opti mal paths For information on configuring BPDU forwarding and blocking refer to Configuring the Spanning Tree on page 41 Physical Features Figure 1 shows the front and rear panels of the Switch The numbers in this diagram refer to num bered sections in Front Panel on page 9 and Rear Panel on page 12 Figure 1 Front and Rear Panels Front Panel The front panel of the Switch contains a series of indi cator lights LEDs that help describe the state of vari ous networking and connection operations Physical Features 9 1 48 RJ 45 Ports WARNING RJ 45 Ports These are shielded RJ 45 data sockets They cannot be used as standard tradi tional telephone sockets or to connect the unit to a traditional PBX or public telephone network Only connect RJ 45 data connectors network telephony systems or network telephones to these sockets Either shielded or unshielded data cables with shielded or unshielded jacks can be
20. the IEEE Std 802 3 2002 IETF Internet Engineering Task Force An organization responsible for providing engineering solutions for TCP IP networks In the network management area this group is responsible for the development of the SNMP protocol Internet Protocol IP is a layer 3 network protocol that is the standard for sending data through a network IP is part of the TCP IP set of protocols that describe the routing of packets to addressed devices An IP address consists of 32 bits divided into two or three fields a network number and a host number or a net work number a subnet number and a host number IP Address Internet Protocol Address A unique identifier for a device attached to a network using TCP IP The GLOSSARY 61 address is written as four octets separated with peri ods full stops and is made up of a network section an optional subnet section and a host section LAN Local Area Network A network of end stations such as PCs printers servers and network devices hubs and switches that cover a relatively small geographic area usually not larger than a floor or building LANs are characterized by high transmission speeds over short distances up to 1000 meters Layer 2 Data Link layer in the ISO 7 Layer Data Communica tions Protocol This is related directly to the hardware interface for the network devices and passes on traf fic based on MAC addresses link aggregation See Trunking
21. 100 1000 port is disabled when an SFP transceiver is plugged in 3 Link Activity LEDs The following tables describe the LEDs visible on the front of the Switch and how to read their status according to color Table 4 10BASE T 100BASE TX Ports Status Meaning Green Link established operating at 100 Mbps Yellow Link established operating at 10 Mbps Physical Features 11 Status Meaning Status Meaning Flashing Packets are being received or transmit ted on the port Off Link not established either nothing is connected to the port or there is a problem m Verify that the attached device is powered on m Verify that the cable or fiber is the correct type and is not faulty m For fiber connections ensure that the receive RX and transmit TX cable connectors are not swapped If these checks do not identify the cause of the problem it may be that the unit or the device connected to the port is faulty Contact your 3Com network sup plier for further advice Table 5 10BASE T 100BASE TX 1000BASE T Ports Status Meaning Green Link established operating at 1000 Mbps Yellow Link established operating at 10 or 100 Flashing Green Flashing Yellow Mbps Packets are being received or transmit ted on the port at 1000 Mbps Packets are being received or transmit ted on the port at 10 or 100 Mbps Flashing Yellow to Port disabled or link loopback error Green Off Link not established eith
22. 5 Related Documentation 6 Documentation Comments 6 INTRODUCING THE BASELINE SWITCH Overview of the Baseline Switch 2250 Plus Features and Capabilities 7 Autosensing of MDI MDIX Connections Autonegotiating 10 100 Mbps Ports SFP Ports 8 Traffic Prioritization 8 Forwarding of BPDU Packets 8 Physical Features 9 Front Panel 9 Rear Panel 12 Package Contents 12 7 7 7 2 INSTALLING THE SWITCH Before You Begin 13 Positioning the Switch 13 Aufstellen des Switch 14 Rack Mounting or Free Standing 14 Using the Mounting Kit 14 Montagesatz Anweisungen 15 Placing Units On Top of Each Other 15 Supplying Power to the Switch 16 Checking for Correct Operation 16 Connecting a Network Device 17 Using SFP Transceivers 18 Approved SFP Transceivers 18 Inserting an SFP Transceiver 18 Removing an SFP Transceiver 19 Performing Spot Checks 19 CONNECTING TO THE WEB INTERFACE Requirements for Accessing the Web Interface 21 Running the Discovery Application 21 Logging On to the Web Interface 22 Navigating the Web Interface 23 Menu 23 Buttons 24 Port Status 24 Accessing the Interface Without Using Discovery 24 DHCP Assigned IP Address 25 Manually Assigned Static IP Address 25 CONFIGURING THE SWITCH Configuration Overview 27 Viewing Summary Information 27 Changing the Admin Password 28 Modifying the IP Address Settings 29 Automatic IP Configuration 29 Setting the IP Address 30 A OBTAINING SUPPORT FOR YOUR PRODUC
23. 9 3266 You can also obtain support in this region using the following URL http emea 3com com support email html Country Telephone Number Europe Middle East and Africa Telephone Technical Support and Repair From anywhere in these 44 0 1442 435529 regions call From the following countries you may use the numbers shown Latin America Telephone Technical Support and Repair From the Caribbean Central and South America call APPENDIX A OBTAINING SUPPORT FOR YOUR PRODUCT Country Antigua Argentina Aruba Bahamas Barbados Belize Bermuda Bonaire Brazil Cayman Chile Colombia Costa Rica Curacao Ecuador Dominican Republic Guatemala Haiti Honduras Jamaica Martinique Mexico Nicaragua Panama Paraguay Peru Puerto Rico Salvador Trinidad and Tobago Uruguay Venezuela Virgin Islands Telephone Number 1 800 988 2112 0 810 444 3COM 1 800 998 2112 1 800 998 2112 1 800 998 2112 52 5 201 0010 1 800 998 2112 1 800 998 2112 0800 13 3COM 1 800 998 2112 AT amp T 800 998 211 AT amp T 800 998 211 AT amp T 800 998 211 1 800 998 2112 AT amp T 800 998 211 AT amp T 800 998 211 AT amp T 800 998 211 57 1 657 0888 AT amp T 800 998 211 1 800 998 2112 571 657 0888 01 800 849CARE AT amp T 800 998 211 AT amp T 800 998 211 54 11 4894 1888 AT amp T 800 998 211 1 800 998 2112 AT amp T 800 998 211 1 800 998 2112 AT amp T 800 998 211 AT amp T 800 998 211
24. Modifying VLANs Use the Modify VLAN screen to change the VLAN to which a port belongs and configure the port to com municate with all other VLANS or a selected VLAN Figure 16 Modify VLANs Screen Modify VLAN Mode Desktop lt E n Desktop Desktop Desktop Desktop Desktop Desktop EIRIEIE ES S ESE Desktop OP OPIN OD Hl el WlnNnie E E3 K3 ES E3 ES CS E3 E3 E3 E3 E3 e E3 Desktop Desktop iv Desktop v Desktop v Desktop iv Desktop iv er m Port Displays the port number m Mode The mode option determines if the port can communicate with all VLANs or only with a selected VLAN m Uplink If you select this the port is able to com municate with all VLANs on the Switch m Desktop If you select this the port can only com municate with other ports assigned to the VLAN selected in the VLAN ID drop down list An uplink port is sometimes referred to as a tagged port The two terms refer to the same feature m VLAN ID Enter the ID of the configured VLAN to which you want this port to belong Defining VLAN Membership Use the Membership screen to configure port mem bers for the selected VLAN Figure 17 Membership Screen VLAN Membership Ports
25. Qo Baseline Switch 2250 Plus 3com 3C16476BS User Guide http www 3com com Part No DUA16476B SAA02 Published April 2005 L 3Com Corporation 350 Campus Drive Marlborough MA USA 01752 3064 Copyright O 2004 2005 3Com Corporation All rights reserved No part of this documentation may be reproduced in any form or by any means or used to make any derivative work such as translation transformation or adaptation without written permission from 3Com Corporation 3Com Corporation reserves the right to revise this documentation and to make changes in content from time to time without obligation on the part of 3Com Corporation to provide notification of such revision or change 3Com Corporation provides this documentation without warranty term or condition of any kind either implied or expressed including but not limited to the implied warranties terms or conditions of merchantability satisfactory quality and fitness for a particular purpose 3Com may make improvements or changes in the product s and or the program s described in this documentation at any time If there is any software on removable media described in this documentation it is furnished under a license agreement included with the product as a separate document in the hard copy documentation or on the removable media in a directory file named LICENSE TXT or ILICENSE TXT If you are unable to locate a copy please contact 3Com and a cop
26. T Configuring Port Settings 31 Basic Port Configuration 31 Advanced Port Configuration 32 Default Port Settings 32 Configuring VLANs 32 Creating a VLAN 33 Deleting VLANs 33 Modifying VLANs 34 Register Your Product 47 Purchase Value Added Services 47 Troubleshoot Online 47 Access Software Downloads 47 Telephone Technical Support and Repair 48 Contact Us 48 Defining VLAN Membership 34 B SAFETY INFORMATION Sample VLAN Configurations 34 Important Safety Information 51 Configuring Trunking 36 France and Peru Only 51 Guidelines for Creating Trunks 36 Power Cord Set 52 Creating Modifying and Deleting Trunks 37 Consignes Importantes de S curit 52 Defining Trunk Membership 37 France et P rou Uniquement 53 Viewing Trunk Information 37 Cordon lectrique 53 Monitoring Traffic 38 Wichtige Sicherheitshinweise Informationen 54 Using the System Tools 39 Stromkabel 54 Restarting the Switch 39 Resetting and Backing Up Restoring Configuration 39 C TECHNICAL INFORMATION Upgrading the System Software 40 Configuring the Spanning Tree 41 802 1p Prioritization 41 Related Standards 57 Environmental 57 Physical 57 Electrical 57 TROUBLESHOOTING Resetting to Factory Defaults 43 GLOSSARY Forgotten Password 43 Forgotten Static IP Address 44 Solving LED Issues 44 INDEX If the Problem Persists 45 REGULATORY NOTICES ABOUT THIS GUIDE This guide is intended for use by network administa tors who are responsible
27. al product In order to access upgrades and related documentation you must first purchase a service con tract from 3Com or your reseller Telephone Technical Support and Repair To obtain telephone support as part of your warranty and other service benefits you must first register your product at http eSupport 3com com Warranty and other service benefits start from the date of purchase so it is important to register your product quickly to ensure you get full use of the war ranty and other service benefits available to you When you contact 3Com for assistance please have the following information ready m Product model name part number and serial number m Proof of purchase if you have not pre registered your product m A list of system hardware and software including revision level m Diagnostic error messages m Details about recent configuration changes if applicable To send a product directly to 3Com for repair you must first obtain a return authorization number RMA Products sent to 3Com without authorization numbers clearly marked on the outside of the pack age will be returned to the sender unopened at the sender s expense If your product is registered and under warranty you can obtain an RMA number online at http eSupport 3com com First time users will need to apply for a user name and pass word Contact Us 3Com offers telephone e mail and internet access to technical support
28. and repair services To access these services for your region use the appropriate tele phone number URL or e mail address from the list below Telephone numbers are correct at the time of publica tion Find a current directory of support telephone numbers posted on the 3Com web site at http csoweb4 3com com contactus Country Telephone Number Asia Pacific Rim Telephone Technical Support and Repair Australia 1 800 678 515 Hong Kong 800 933 486 India 61 2 9424 5179 or 000800 6501111 Indonesia 001 803 61 009 Japan 00531 616 439 or 03 3507 5984 Malaysia 1800 801 777 New Zealand 0800 446 398 Pakistan 61 2 9937 5083 Philippines 1235 61 266 2602 or 1800 1 888 9469 PR of China 800 810 3033 Singapore 800 6161 463 S Korea 080 333 3308 Taiwan 00801 611 261 Thailand 001 800 611 2000 Contact Us 49 You can also obtain support in this region using the following e mail apr_technical_support 3com com Or request a repair authorization number RMA by fax using this number 65 543 6348 Country Telephone Number Austria 01 7956 7124 Belgium 070 700 770 Denmark 7010 7289 Finland 01080 2783 France 0825 809 622 Germany 01805 404 747 Hungary 06800 12813 Ireland 1407 3387 Israel 1800 945 3794 Italy 199 161346 Luxembourg 342 0808128 Netherlands 0900 777 7737 Norway 815 33 047 Poland 00800 441 1357 Portugal 707 200 123 South Africa 0800 995 014 Spain 9 021 60455 Sweden 07711 14453 Switzerland 08488 50112 U K 0870 90
29. aseline Switch 2250 Plus 3com Summary Summary Password System Tntormatton IP Settings Port Contiguration VLANS Trunking Trafic Monitoring m Tools Menu Port Status Table 8 lists the available items on the menu Table 8 Available Menu Items 23 Menu Item Description Summary Provides a summary of the Switch s basic settings and versions of current components Password Allows you to change the administra tor password IP Settings Allows you to configure the IP address settings of the Switch CHAPTER 3 CONNECTING TO THE WEB INTERFACE Menu Item Description Port Configuration Allows you to configure the Switch port settings VLANs Allows you to create VLAN groups add port members and specify how VLAN tagging is used Trunking Allows you to set up and maintain trunk membership for port groups Traffic Monitoring Allows you to perform port traffic monitoring on the Switch To monitor a port you will also need a network analyzer System Tools Contains tabs that allow you to m Restart and reset the Switch m Back up and restore configuratio m Upgrade the firmware m Configure forwarding of BPDU packets to support a spanning tree topology m Enable and disable 802 1p prioriti zation Support Displays 3Com contact information and describes how to use the online help system Log Out Allows you to securely log off the Web interface Buttons Depending on the screen that
30. by the EIA TIA 568 standard Category 5 can be used in Ethernet 10BASE T and Fast Ethernet networks 100BASE TX and can transmit data at speeds of up to 100 Mbps Category 5 cabling is better to use for network cabling than Category 3 because it supports both Ethernet 10 Mbps and Fast Ethernet 100 Mbps speeds 60 GLOSSARY category 5e cables One of five grades of Twisted Pair TP cabling defined by the EIA TIA 568 standard Category 5e can be used in Ethernet 10BASE T Fast Ethernet 100BASE TX and Gigabit Ethernet 1000BASE T networks and can transmit data at speeds of up to 1000 Mbps category 6 cable One of five grades of Twisted Pair TP cabling defined by the EIA TIA 568 B standard Category 6 can be used in Ethernet 10BASE T Fast Ethernet 100BASE TX and Gigabit Ethernet 1000BASE T networks and can transmit data at speeds of up to 1000 Mbps client The term used to describe the desktop PC that is con nected to your network DHCP Dynamic Host Configuration Protocol This protocol automatically assigns an IP address for every com puter on your network Windows 95 Windows 98 and Windows NT 4 0 contain software that assigns IP addresses to workstations on a network These assignments are made by the DHCP server software that runs on Windows NT Server Ethernet A LAN specification developed jointly by Xerox Intel and Digital Equipment Corporation Ethernet net works use CSMA CD to transmit pa
31. cate with the Switch you need to assign an IP address to it either by DHCP or by assigning a static IP address By default the Switch performs automatic IP configu ration and assigns an IP address to itself This is neces sary for the Discovery application to be able to connect to the Web interface Automatic IP Configuration gt When you power on the Switch for the first time it automatically uses the default IP address 169 254 x y Where and y are the last two bytes of its MAC address To determine the exact IP address that the Switch assigns to itself during auto IP configuration check Modifying the IP Address Settings 29 the sticker on the base of the Switch This sticker con tains the MAC address and default IP address of the Switch To detect its IP information using the automatic con figuration process the Switch goes through the fol lowing sequence of steps The Switch tries to configure itself with the default IP address 169 254 x y where x and y are converted from the last two bytes of its MAC address For example if the MAC address is 08004F000102 the IP address would be 169 254 1 2 This address is used if the Switch is operating in a standalone mode or no other switches on the network have this IP address The Switch also assigns the subnet mask 255 255 0 0 default class B mask to itself If this default IP address is already in use on the net work then the Switch detects this an
32. ch will read the priority level and determine whether the packet should be directed through the normal or high prior ity channel This feature can be useful for example during excessive loads when one type of traffic may require priority over another The Switch is configured to comply with 802 1p VLAN tagged frames Traffic prioritization ensures that high priority data is forwarded through the Switch without being delayed by lower priority data It differentiates traffic into classes and prioritizes those classes automatically Traffic prioritization uses the multiple traffic queues that are present in the hardware of the Switch to ensure that high priority traffic is forwarded on a dif ferent queue from lower priority traffic and is given preference over that traffic This ensures that time sensitive traffic gets the highest level of service The 802 1D standard specifies eight distinct levels of priority 0 to 7 each of which relates to a particular type of traffic The priority levels and their traffic types are shown in the following table Table 10 Priority Levels for Traffic Types Priority Level Traffic Type 0 Best effort 1 Background 2 Standard spare 3 Excellent effort business critical 4 Controlled load streaming multimedia 5 Video interactive media less than 100 milliseconds latency and jitter 6 Voice interactive voice less than 10 milli seconds latency and jitter 7 Network control reserve
33. ckets at a rate of 10 Mbps and 100 Mbps over a variety of cables Ethernet address See MAC address Fast Ethernet An Ethernet system that is designed to operate at 100 Mbps Gigabit Ethernet An Ethernet system that is designed to operate at 1000 Mbps full duplex A system that allows packets to be transmitted and received at the same time and in effect doubles the potential throughput of a link half duplex A system that allows packets to be transmitted and received but not at the same time Half duplex is not supported for 1000 Mbps Contrast with full duplex IEEE Institute of Electrical and Electronics Engineers This American organization was founded in 1963 and sets standards for computers and communications IEEE 802 1D Specifies a general method for the operation of MAC bridges including the Spanning Tree Protocol IEEE 802 1Q VLAN Tagging Defines Ethernet frame tags that carry VLAN information It allows switches to assign endstations to different virtual LANs and defines a standard way for VLANs to communicate across switched networks IEEE 802 1p An IEEE standard for providing quality of service QoS in Ethernet networks The standard uses packet tags that define up to eight traffic classes and allows Switches to transmit packets based on the tagged pri ority value IEEE 802 3ad A standard that defines link aggregation 802 3ad is now incorporated into the relevant sections of
34. connected to these data sockets AVERTISSEMENT Points d acc s RJ 45 Ceux ci sont prot g s par des prises de donn es Ils ne peuvent pas tre utilis s comme prises de t l phone conven tionnelles standard ni pour la connection de l unit un r seau t l phonique central priv ou public Rac corder seulement connecteurs de donn es RJ 45 syst mes de r seaux de t l phonie ou t l phones de r seaux ces prises Il est possible de raccorder des c bles prot g s ou non prot g s avec des jacks prot g s ou non pro t g s ces prises de donn es WARNHINWEIS RJ 45 Porte Diese Porte sind gesch tzte Datensteckdosen Sie d rfen weder wie normale traditionelle Telefonsteckdosen noch f r die Verbindung der Einheit mit einem traditionellem pri vatem oder ffentlichem Telefonnetzwerk gebraucht werden Nur RJ 45 Datenansclu e Telefonnetzsys teme or Netztelefone an diese Steckdosen anschlieBen 10 CHAPTER 1 INTRODUCING THE BASELINE SWITCH Entweder gesch tzte oder ungesch tzte Buchsen d rfen an diese Datensteckdosen angeschlossen wer den The Switch has 48 10 100 Mbps autonegotiating ports ports 1 to 48 Their speed and duplex mode half duplex or full duplex are automatically deter mined by the capabilities of the connected device Each port also supports automatic MDI MDI X detec tion and can be connected to either a 10BASE T or a 100BASE TX device CAUTION The Switch supports full dupl
35. d increments the last byte of the MAC address by one to generate its IP address The IP address would therefore become 169 254 1 3 The Switch repeats step 2 until an unused IP address is found 3Com recommends using automatic IP configuration only for the initial setup Once you gain access to the console you should assign an IP address to the Switch either by using DHCP or assigning a static IP address to ensure successful communication between the Switch and other network devices 30 CHAPTER A CONFIGURING THE SWITCH Setting the IP Address To set the IP address for the Switch 1 Click IP Settings on the menu The IP Settings screen appears Figure 11 IP Settings Screen IP Settings Management VLAN 1 IP Address Mode Static IP Address 152 67 181 250 Subnet Mask 255 255 255 0 Default Gateway MAC Address 00 00 22 22 33 33 2 Configure the Switch s IP settings Available options are listed in Table 9 Table 9 IP Setting Options Option Description IP Address Mode Specify how the Switch will get its IP address Available options include m DHCP Select this option if you have a DHCP server on the network and you want the Switch to automatically obtain an IP address from it m Static Select this option if you want to manually assign an IP address to the Switch IP Address Specify an IP address that you want to assign to the Switch This option is only available if P Add
36. d traffic The traffic prioritization feature supported by the i gt Switch is compatible with the relevant sections of the IEEE 802 1D standard incorporating IEEE 802 1p This switch uses the Weighted Round Robin WRR algorithm to determine the frequency at which it ser vices each priority queue The Switch allows you to choose between using IP Precedence or DSCP Differ entiated Services Code Point priority When either of these services is enabled the priorities are mapped to a Class of Service value by the Switch and the traffic then sent to the corresponding output queue Figure 28 802 1p Prioritization Screen Restart Configuration lt Upgrade Spanning Tree 802 1p Prioritization 802 1p Prioritization Help 802 1p Prioritization v Apply TROUBLESHOOTING This chapter lists some issues that you may encounter while installing using and managing the Switch with suggested courses of corrective action to take If you encounter an issue that is not listed here and you cannot solve it check the 3Com Knowledgebase at http knowledgebase 3com com before contacting your local technical support representative For more information on how to obtain support for your Switch refer to Appendix A Resetting to Factory Defaults AN 3 If the Switch does not operate normally or if the firm ware becomes corrupted you can reset the Switch to factory defaults CAUTION Resetting the Switch to factory defa
37. e alle Kabel wieder an Placing Units On Top of Each Other If the Switch units are free standing up to four units can be placed one on top of the other If you are 16 CHAPTER 2 INSTALLING THE SWITCH mixing a variety of Baseline and SuperStack units the smaller units must be positioned at the top If you are placing Switch units one on top of the other you must use the self adhesive rubber pads supplied Apply the pads to the underside of each Switch sticking one in the marked area at each cor ner Place the Switch units on top of each other ensuring that the pads of the upper unit line up with the recesses of the lower unit Supplying Power to the Switch pu Power problems can be the cause of serious failures and downtime in your network Ensure that the power input to your system is clean and free from sags and surges to avoid unforeseen network out ages 3Com recommends that you install power con ditioning especially in areas prone to black outs power dips and electrical storms The unit is intended to be grounded Ensure it is con nected to earth ground during normal use Installing proper grounding helps to avoid damage from light ning and power surges Before powering on the Switch verify that network cables and the power cable are securely connected CAUTION The Switch has no ON OFF switch the only method of connecting or disconnecting main power is by connecting or disconnecting the power cord
38. e default IP address 169 254 x y see Automatic IP Configu ration on page 29 You may need to restart your computer to re establish communication with the Switch Upgrading the System Software The Upgrade facility allows you to install on the Switch any new releases of system software that 3Com may make available Newer versions of software can be downloaded via HTTP and copied to the Switch the Switch will restart and apply the newer system software version Browse Note You need to make sure the File of type is set to All files to see the file Once you have downloaded the software use the Browse button to locate the file on your computer and then click Apply You may need to change the file type in the dialog box displayed by your Web browser to to be able to see the file The file will be copied to the Switch and once this has completed the Switch will restart Although the upgrade process has been designed to preserve your configuration settings 3Com recommends that you make a backup of the configuration beforehand in case the upgrade process fails for any reason for example the connection between the computer and the Switch is lost while the new software is being copied to the Switch A progress screen displays while the upgrade is taking place The upgrade procedure can take a few minutes and is complete when the progress bar has finished run ning and the Power LED has
39. ecter la norme SEV ASE 1011 m La prise secteur doit tre conforme aux normes CEE 7 7 SCHUKO m LE cordon secteur doit porter la mention HAR ou lt BASEC gt et doit tre de type HO3VVF3GO 75 minimum 54 A A APPENDIX B SAFETY INFORMATION AVERTISSEMENT Ports pour fibres optiques s cu rit sur le plan optique 7 T DISPOSITIF LASER DE CLASSEI N Ne regardez jamais le laser tant qu il est sous tension Ne regardez jamais directement le port fibres optiques et les embouts de c bles fibres optiques tant qu ils sont sous tension 4 AVERTISSEMENT L utilisation de contr les de r glages de performances ou de proc dures autres que ceux qui sont sp cifi s au sein du pr sent docu ment risquent d entra ner l exposition des rayonne ments laser dangereux Wichtige Sicherheitshinweise Informationen A Bitte unbedingt vor dem Einbauen des Baseline Switch 2250 Plus die folgenden Sicherheitsanweisun gen durchlesen WARNUNG Die Installation und der Ausbau des Ger ts darf nur durch Fachpersonal erfolgen m Wenn der Baseline Switch 2250 Plus mit anderen 3Com Hubs oder Switche gestapelt werden soll m ssen gr ssere Ger te unter den schmaleren Hubs eingebaut werden m Das Ger t sollte nicht an eine ungeerdete Wechsel stromsteckdose angeschlossen werden m Das Ger t mu an eine geerdete Steckdose ange schlossen werden welche die internationalen Sicherheitsnormen erf
40. efers to bonding multiple ports into a single group to effec tively combine the bandwidth into a single connec tion or a trunk If you are connecting the Switch to another switch or to an Internet backbone you can aggregate links on the Switch to increase throughput and prevent packet loopback between switches For link aggregation to work the trunks must be con figured on both ends switches The Switch does not support the Link Aggregation Control Protocol LACP which is specified in IEEE 802 3ad Guidelines for Creating Trunks m Any port on the Switch can be used for creating a trunk m This switch supports a maximum of four trunks m Each trunk may contain up to eight members m A port may only be a member of one trunk at any one time m All ports in a trunk must be configured in an iden tical manner including communication mode that is speed duplex mode and flow control Creating Modifying and Deleting Trunks Use the Modify Delete tabe under Trunking to create configure or remove ports groups from trunks Figure 20 Modify Delete Screen Trunk Modify Delete Trunk Number Name Flow Control Speed Duplex Delete X Trunk Enabled x Auto iv m Trunk Number Displays the number of the trunk m Name Allows you to label an interface Range 1 64 characters m Flow Control Allows automatic or manual selec tion of flow control m Speed Dup
41. en raum sicherstellen m Die Luft so frei wie m glich von Staub ist m Es unwahrscheinlich ist das die Betriebstemperatur berschritten wird 3Com empfiehlt das Sie den Switch in einer sauberen klimatisierten Umgebung installieren Rack Mounting or Free Standing AN The unit can be mounted in a 19 inch equipment rack using the supplied mounting kit see Using the Mounting Kit on page 14 or it can be free stand ing Do not place objects on top of the unit or stack CAUTION If installing the Switch in a free standing stack of different size Baseline or SuperStack 3 units the smaller units must be installed above the larger ones Do not have a free standing stack of more than six units Using the Mounting Kit The Switch is supplied with two mounting brackets and four screws These are used for rack mounting the unit When mounting the unit take note of the guidelines given in Positioning the Switch on page 13 The Switch is 1U 1 75 in high and will fit in a stan dard 19 inch rack CAUTION Before continuing disconnect all cables from the unit Remove the self adhesive pads from the underside of unit if already fitted To rack mount the Switch 1 Place the unit the right way up on a hard flat surface with the front facing towards you 2 Locate a mounting bracket over the mounting holes on one side of the unit 3 Insert the two screws supplied in the mounting kit and fully tighte
42. ending out broadcast frames regularly Refer to the documentation that accompanies the device for information on disabling the broadcast operation If the Problem Persists If the problem persists and the unit still does not operate successfully contact your 3Com network supplier with the following information before return ing the unit 46 CHAPTER 5 TROUBLESHOOTING A Register Your Product Warranty and other service benefits start from the date of purchase so it is important to register your product quickly to ensure you get full use of the war ranty and other service benefits available to you Warranty and other service benefits are enabled through product registration Register your product at http eSupport 3com com 3Com eSupport services are based on accounts that you create or have authorization to access First time users must apply for a user name and password that provides access to a number of eSupport features including Product Registration Repair Services and Service Request If you have trouble registering your product please contact 3Com Global Services for assistance Purchase Value Added Services To enhance response times or extend warranty bene fits contact 3Com or your authorized 3Com reseller Value added services like 3Com Express M and Guard ian M can include 24x7 telephone technical support software upgrades onsite assistance or advance hardware replacement Experienced en
43. er company and product names may be trademarks of the respective companies with which they are associated ENVIRONMENTAL STATEMENT It is the policy of 3Com Corporation to be environmentally friendly in all operations To uphold our policy we are committed to Establishing environmental performance standards that comply with national legislation and regulations Conserving energy materials and natural resources in all operations Reducing the waste generated by all operations Ensuring that all waste conforms to recognized environmental standards Maximizing the recyclable and reusable content of all products Ensuring that all products can be recycled reused and disposed of safely Ensuring that all products are labelled according to recognized environmental standards Improving our environmental record on a continual basis End of Life Statement 3Com processes allow for the recovery reclamation and safe disposal of all end of life electronic components Regulated Materials Statement 3Com products do not contain any hazardous or ozone depleting material Environmental Statement about the Documentation The documentation for this product is printed on paper that comes from sustainable managed forests it is fully biodegradable and recyclable and is completely chlorine free The varnish is environmentally friendly and the inks are vegetable based with a low heavy metal content CONTENTS ABOUT THIS GUIDE Conventions
44. er nothing is connected to the port or there is a problem m Verify that the attached device is powered on m Verify that the cable or fiber is the correct type and is not faulty m For fiber connections ensure that the receive RX and transmit TX cable connectors are not swapped If these checks do not identify the cause of the problem it may be that the unit or the device connected to the port is faulty Contact your 3Com network sup plier for further advice 4 Module Active LEDs The Module Active LEDs show the status of any SFP modules that are installed Status Meaning Green Fiber SFP is inserted in the slot Off No fiber SFP is inserted in the slot 5 Power LED The Power LED shows the power status of the Switch Status Meaning Green The unit is powered on and ready for use 12 p CHAPTER 1 INTRODUCING THE BASELINE SWITCH Off The unit is not receiving power m Verify that the power cord is connected cor rectly m f the unit still does not operate contact your 3Com network supplier Flashing m Power on self test is in progress Green Yellow m Power on self test or loopback test failed If this occurs reset the Switch to factory defaults Refer to Resetting to Factory Defaults 6 Self Adhesive Pads The unit is supplied with four self adhesive rubber pads Do not apply the pads if you intend to rack mount the unit If the unit is to be part of a free standing stack app
45. erify That Cabling All external cabling connections are secure and that no cables are pulled taut Cooling fan Where possible check that the cooling fan is operating by listening to the unit The fan is fitted near to the front right hand side of the unit when viewed from the front If you experience any problems operating the Switch refer to Troubleshooting starting on page 43 1 Disconnect the cable from the transceiver 2 Move the wire release lever downwards until it is pointing toward you 3 Pull the wire release lever toward you to release the catch mechanism The SFP transceiver should slide out easily Performing Spot Checks At frequent intervals you should visually check the Switch Regular checks can give you an early warning 20 CHAPTER 2 INSTALLING THE SWITCH 3 The Switch has a built in Web interface that you can use to set the admin password change the IP address that is assigned to the Switch and configure its advanced settings If you only want the Switch to function as a basic layer 2 switch you do not need to access the Web interface and configure the Switch This chapter provides information on how the gain access to the Web interface using the Discovery appli cation It also introduces the menu items and buttons that are available on the Web interface The following topics are covered m Requirements for Accessing the Web Interface m Running the Discovery Applica
46. ex autone gotiation If the connected device does not support autonegotiation the Switch will operate in half duplex mode even if the attached device is oper ating in full duplex mode In such a configuration you may notice some degradation of network performance 3Com recommends that you use devices that are capable of autonegotiation and that you ensure that autonegotiation is enabled if it is a configurable option see Troubleshooting on page 43 2 10 100 1000BASE T SFP Ports Ports 49 and 50 are combination Gigabit RJ 45 ports with shared Small Form Factor Pluggable SFP trans ceiver slots If an SFP transceiver purchased sepa rately is installed in a slot and is active the associated RJ 45 port of the same number is disabled The 1000BASE T RJ 45 ports support automatic MDI MDI X operation so you can use straight through or crossover cables for all network connections to workstations or servers or to other switches or hubs The two SFP ports support fiber Gigabit Ethernet short wave SX and long wave LX SFP transceivers in any combination This offers you the flexibility of using SFP transceivers to provide connectivity between the Switch and remote 1000 Mbps work groups or to create a high capacity aggregated link backbone connection SEP ports are numbered 49 and 50 on the Switch When an SFP port is active it has priority over the 10 100 1000 port of the same number The corre sponding 10
47. f hren Wichtige Sicherheitshinweise Informationen 55 56 APPENDIX B SAFETY INFORMATION C TECHNICAL INFORMATION Related Standards The 3Com Baseline Switch 2250 Plus has been designed to the following standards Functional MAC Address Safety EMC Emissions Immunity Environmental Operating Temperature Humidity Standard ISO 8802 3 IEEE 802 3 Ethernet IEEE 802 3u Fast Ethernet IEEE 802 3ab Gigabit Ethernet IEEE 802 3x Flow Control IEEE 802 1D 1998 Bridging 8192 UL60950 1 EN60950 CSA60950 1 IEC60950 EN 55022 Class A FCC Part 15 Subpart B Class A ICES 003 Class A VCCI Class A AS NZS 3548 Class A CNS 13438 Class A EN 55024 0 45 C 32 113 F 10 95 non condensing EN 60068 IEC 68 various parts Physical Width Depth Height Weight Mounting Electrical Power Inlet AC Line Frequency Input Voltage Current Rating Maximum Power Con sumption Maximum Power Dissi pation 440 mm 17 3 in 235 5 mm 9 2 in 43 6 mm 1 7 in or 1U 3 1 kgs 6 83 lbs Free standing or 19 in rack mounted using the mounting kit supplied IEC 320 50 60 Hz 100 240 VAC 2 amperes maximum 56 watts 184 3 BTU hr 58 APPENDIX C TECHNICAL INFORMATION GLOSSARY 10BASE T The IEEE specification for 10 Mbps Ethernet over Cat egory 3 4 or 5 twisted pair cable 100BASE TX The IEEE specification for 100 Mbps Fast Ethernet over Category 5 t
48. fault admin account settings m User name admin m Password blank no password Forgotten Static IP Address If you forget the static IP address that you assigned to the Switch and you need to access the Web interface use the Discovery application to automatically detect the IP address and connect to the interface For information on using the Discovery application refer to Running the Discovery Application on page 21 Solving LED Issues This section lists some issues that are related to the LEDs on the front panel of the Switch For informa tion on basic LED checks refer to the following topics in Chapter 1 m 4 Module Active LEDs m 4 Module Active LEDs m 3 Link Activity LEDs m 5 Power LED A link is connected but the Link Activity LED for the port is off There is a problem with this connection Verify that m The device being connected to is powered on and operating correctly m The cable is connected at both ends m The cable is not damaged m f the connection is to a workstation that the workstation s network interface is installed and configured correctly m The correct category of cable is being used for the required link speed Category 3 cables can be used for TOBASE T operation only Category 5 cable is required for 100BASE TX or 1000BASE T 3Com recommends Category 5e or 6 cables for 1000BASE T operation A fiber cable is connected but the Module Active LED
49. gineers are available to manage your installation with minimal disruption to your network Expert assessment and implementation services are offered to fill resource gaps and ensure the success of your networking OBTAINING SUPPORT FOR YOUR PRODUCT projects More information on 3Com maintenance and Professional Services is available at http www 3com com Contact your authorized 3Com reseller or 3Com for a complete list of the value added services available in your area Troubleshoot Online You will find support tools posted on the 3Com web site at http www 3com com 3Com Knowledgebase helps you troubleshoot 3Com products This query based interactive tool is located at http knowledgebase 3com com and contains thousands of technical solutions written by 3Com support engineers Access Software Downloads Software Updates are the bug fix maintenance releases for the version of software initially purchased with the product In order to access these Software Updates you must first register your product on the 3Com web site at http eSupport 3com com First time users will need to apply for a user name and password A link to software downloads can be 48 APPENDIX A OBTAINING SUPPORT FOR YOUR PRODUCT found at http eSupport 3com com or under the Product Support heading at http www 3com com Software Upgrades are the software releases that follow the software version included with your origi n
50. he VLAN or configure a port make it a member of all VLANs Communication between different VLANs can only take place if they are all connected to a router or layer 3 switch Creating a VLAN Use the Create VLANs screen to create VLANs on the Switch To propagate information about VLAN groups used on this Switch to external devices you must specify a VLAN ID for each VLAN Figure 14 Create VLANs Screen AN Configuring VLANs 33 For examples on setting up VLANS refer to Sample VLAN Configurations CAUTION At least one port must always be a member of VLAN 1 the management VLAN If you choose to connect all ports to VLANs other than VLAN 1 you will no longer be able to access the Web interface If this happens you will need to reset the Switch to factory settings By default all ports belong to VLAN 1 Deleting VLANs Use the Delete screen to remove a VLAN group from the current list Figure 15 Delete Screen Create VLANS Delete VLANs Create a Virtual LAN in the unit Delete a Virtual LAN in the unit VLAN ID 2 v Name vanm il m VLAN ID ID of the VLAN to be deleted If any port is assigned to this group as untagged it will be reassigned to VLAN group 1 as untagged Available options on the Create VLAN screen include m VLAN ID ID of configured VLAN 1 4094 no leading zeroes m Name Name of the VLAN 1 to 32 characters 34 CHAPTER A CONFIGURING THE SWITCH
51. iew of the features and capabilities of the 3Com Baseline Switch 2250 Plus It also identifies the contents of the Switch package and helps you get to know the physical features of the device Overview of the Baseline Switch 2250 Plus The 3Com Baseline Switch 2250 Plus is a versatile easy to use unmanaged switch It is ideal for users who want the high speed performance of 10 100 switching with the added functionality of Gigabit links but do not need sophisticated management capabilities The Switch is shipped ready for use No configuration is necessary unless you want to configure advanced features such as VLAN support and link aggregation Features and Capabilities The Switch has 48 shielded RJ 45 10 100 Mbps auto negotiating ports and two 10 100 1000BASE T ports that operate in conjunction with two Small Form Factor Pluggable SFP transceiver slots on the front panel Use these SFP transceiver slots for easy flexible connection to fiber based Gigabit media While there are four physical Gigabit ports only a maximum of two can be operational at any given time Autosensing of MDI MDIX Connections All ports on the Switch can autosense both medium dependent interface MDI and medium dependent interface crossover MDIX connections This allows you to connect network devices to each port using either a normal straight through TP twisted pair cable or a crossover TP cable Any port can therefore be used t
52. ing to IEC 60 The con ditions are only maintained if the equipment to which it is connected also operates under SELV conditions France and Peru Only This unit cannot be powered from IT supplies If your supplies are of IT type this unit must be powered by 230 V 2P T via an isolation transformer ratio 1 1 with the secondary connection point labelled Neutral connected directly to earth ground Imp dance la terre 52 APPENDIX B SAFETY INFORMATION Power Cord Set f WARNING Fiber Optic Ports Optical Safety This must be approved for the country where it will be used CLASS LASER DEVICE U S A and Canada m The cord set must be UL approved and CSA certified m The minimum specifications for the flexible cord are Never look at the transmit laser while it is powered on Never look directly at the fiber ports and fiber No 18 AWG cable ends when they are powered on Type SV or SJ 3 conductor WARNING Use of controls or adjustments of perfor The cord set must have a rated cur mance or procedures other than those specified rent capacity of at least 10 A herein may result in hazardous laser emissions m The attachment plug must be an earth grounding type with a NEMA 5 15P 15 A 125 V or NEMA 6 15P 15 A 250 V configuration Consignes Importantes de S curit Denmark The supply plug must comply with Sec Veuillez lire fond l information de la s curit suiva tion 107 2 D1
53. l as the address of the destination network traffic monitoring Enables the monitoring of port traffic by attaching a network analyzer to one switch port in order to mon itor the traffic of other ports on the Switch trunking VLAN A method which specifies how to create a single high speed logical link that combines several lower speed physical links Virtual LAN A collection of network nodes that share the same collision domain regardless of their physical location or connection point in the network A VLAN serves as a logical workgroup with no physical barri ers and allows users to share information and resources as though located on the same LAN GLOSSARY 63 64 GLOSSARY INDEX Numbers 1000BASE LX 59 1000BASE SX 59 1000BASE T 59 100BASE TX 59 10BASE T 59 A auto IP configuration 29 default IP address 29 default mask 29 autonegotiation 7 autosensing 7 B bandwidth 59 C dient 60 configuration overview 27 connecting network device 17 SFP transceivers 18 conventions notice icons About This Guide 5 text About This Guide 5 D DHCP 60 Discovery 21 dynamic host control protocol See DHCP E Ethernet 60 F Fast Ethernet 60 forgotten IP address 43 forgotten password 43 free standing 14 front panel Link Activity LEDs 10 Module Active LEDs 11 Power LED 11 RJ 45 ports 11 self adhesive pads 12 SFP ports 10 full duplex 60 L LAN defined 61 LED issues 44 LEDs
54. lex Allows auto negotiation to be enabled or disabled When auto negotiation is dis abled you can force the settings for speed duplex mode and flow control Defining Trunk Membership Use the Membership screen to add ports to a group membership Configuring Trunking 37 Figure 21 Membership Screen Trunk Membership D a Status Link Down Link Down Link Down Link Down Link Down Link Down Link Down Link Down o ojusjoluw r u w n e Link Down Link Down Link Down 100 FD Link Up Link Down kj ie eee eie e Jie Link Down m Port The port number m Status The status refers to the speed and duplex mode of the trunk members m Trunk ID of trunk Viewing Trunk Information To view information on the configuration settings for the created trunks click the Summary tab under Trunking 38 CHAPTER A CONFIGURING THE SWITCH Figure 22 Summary Screen Trunk Summary Admin Oper Speed Duplex Flow Control Trunk Name Type inus Status Status Status Autonegotiation i Funk 10 BASE T 100 Enabled Down 100 FD None Enabled Monitoring Traffic The Switch allows you to monitor traffic going in and out of a particular port For traffic monitoring to work you need to attach a network analyzer to one port and use it to monitor the traffic
55. ly the pads to each marked corner area on the under side of the unit Place the unit on top of the lower unit ensuring that the pads locate with the recesses of the lower unit Rear Panel 7 Power Supply The Switch automatically adjusts to the supply volt age Only use the power cord that is supplied with the unit 8 Recovery Button Use the Recovery button on the rear panel to reset the Switch to its factory defaults For more informa tion refer to Resetting to Factory Defaults on page 43 Package Contents The 3Com Baseline Switch 2250 Plus package includes the following items m One 3Com Baseline Switch 2250 Plus unit m One power cord m Four standard height self adhesive rubber pads m One mounting kit m One CD ROM which contains this User Guide and the 3Com Discovery application m One warranty flyer Before installing and using the Switch verify that your Switch package has all these items If any of the above items are damaged or missing contact your 3Com network supplier immediately 2 This chapter contains information that you need to install and set up the Switch It covers the following topics m Positioning the Switch m Rack Mounting or Free Standing m Supplying Power to the Switch m Connecting a Network Device m Connecting a Network Device m Performing Spot Checks INSTALLING THE SWITCH iten verrichten lesen Sie die Sicherheitsanweisungen die i
56. n Appendix B Anhang B in diesem Handbuch aufgefuehrt sind Before You Begin PN PN WARNING Safety Information Before installing or removing any components from the Switch or carry ing out any maintenance procedures read the safety information provided in Appendix B of this guide AVERTISSEMENT Consignes de securite Avant d installer ou d enlever tout composant du Switch ou d entamer une proc dure de maintenance lisez les informations relatives la s curit qui se trouvent dans Appendix B l Appendice B de ce guide WARNHINWEIS Sicherheitsinformationen Bevor Sie Komponenten aus dem Switch entfernen oder dem Switch hinzufuegen oder Instandhaltungsarbe Positioning the Switch The Switch is suitable for use in an office environment where it can be free standing or mounted in a stan dard 19 inch equipment rack Alternatively the Switch can be rack mounted in a wiring closet or equipment room A mounting kit containing two mounting brackets and four screws is supplied with the Switch When deciding where to position the Switch ensure that m It is accessible and cables can be connected easily m Cabling is away from sources of electrical noise These include lift shafts microwave ovens and air conditioning units Electromagnetic fields can interfere with the signals on copper cabling and introduce errors therefore slowing down your net work m Water or moisture cannot enter the case of the
57. n will be lost Backup Configuration Please press the BACKUP button to save configuration data to your PC Note You need to make sure the File of type is set to All files Restore Configuration Please select the location of the previously backed up configuration file on your PC using the BROWSE button below then press the Restore button Hm JC Browse RESTORE Note You need to make sure the File of type is set to All files to see the file m Click BACKUP to save the current configurations of the Switch You will be prompted to download and save a file to disk 40 CHAPTER A CONFIGURING THE SWITCH m To reload configuration settings that you previ Figure 26 Upgrade Screen ously saved to a file scroll down the page and then click Browse to locate the backup file on your computer and then RESTORE to copy the configu ration back to the Switch upgrade Firmware This allows you to upgrade the software installed on this unit to a new version downloaded from the 3Com Support Website Please select the location of the software upgrade file on your PC using the BROWSE button below then press the Apply button For security purposes restoring the configuration does not change the password m f you want to reset the settings on your Switch to those that were loaded at the factory click RESET You will lose all your configuration changes The Switch LAN IP address will revert to th
58. n with a suitable screwdriver Figure 2 Inserting the Screws 4 Repeat the two previous steps for the other side of the unit 5 Insert the unit into the 19 inch rack and secure with suitable screws not provided Ensure that the venti lation holes are not obstructed 6 Reconnect the network cables Rack Mounting or Free Standing 15 Montagesatz Anweisungen Der Switch wird mit zwei Halterungen und vier Schrauben geliefert Diese werde f r den Einbau in einen Baugruppentr ger benutzt Bei der Montage der Baugruppe beachten Sie die Anweisungen aus Aufstellen des Switch Der Switch ist eine Baueinheit hoch und passt in einen Standard 19 Zoll Baugruppentr ger ACHTUNG Entfernen Sie alle Kabel bevor Sie fort A fahren Entfernen Sie die selbstklebenden Polster F e von der Unterseite der Baugruppe falls diese bereits angebracht sind 1 Plazieren Sie die Baugruppe aufrecht auf einer harten ebenen Fl che mit der Vorderseite zu Ihnen 2 Ordnen Sie eine der Halterungen ber den L chern an der Seite der Baugruppe an 3 Stecken Sie zwei der mitgelieferten Schrauben in die L cher und drehen Sie diese mit einem geeigneten Schraubendreher fest 4 Widerholen Sie letzten beiden Schritte auf der anderen Seite der Baugruppe 5 F hren Sie die Baugruppe in den 19 Zoll Baugrup pentr ger ein und sichern sie die Baugruppe mit geeigneten Schrauben Nicht im Lieferumfang enthalten 6 Schlie en Si
59. o connect to another Switch port server or workstation without additional configuration Autonegotiating 10 100 Mbps Ports Each 10 100 Mbps port automatically determines the speed and duplex mode of the connected equipment and provides a suitable switched connection The 1000BASE T ports also support automatic 10 100 1000 Mbps speed detection The 10 100 Mbps connections on these 1000BASE T ports operate in full duplex mode CHAPTER 1 INTRODUCING THE BASELINE SWITCH SFP Ports The two SFP ports support fiber Gigabit Ethernet short wave SX and long wave LX SFP transceivers in any combination This offers you the flexibility of using SFP transceivers to provide connectivity between the Switch and a 1000 Mbps core network When an SFP port is in operation the corresponding 10 100 1000BASE T port is disabled Traffic Prioritization The Switch offers priority queuing which means all packets that are received are examined to see if they have been priority encoded If a packet has been pri ority encoded then the Switch will read the priority level and determine whether the packet should be directed through the normal or high priority channel This feature is useful during excessive loads when one type of traffic may require priority over another The Switch is configured to comply with 802 1p VLAN tagged frames Traffic prioritization ensures that high priority data is forwarded through the Switch without being delayed by
60. or You can monitor only one type of packet at a time Select either TX or RX from the Mirror Type drop down menu Click Apply For information on how to interpret the output on the port analyzer refer to its accompanying docu mentation Using the System Tools The System Tools menu includes five administration items m Restart m Configuration m Upgrade m Spanning Tree m 802 1p Prioritization Restarting the Switch Pressing the Restart the Switch button has the same effect as power cycling the unit No configuration information will be lost Restart the Switch if you are experiencing problems and you want to re establish your Internet connection Figure 24 Restart Screen Restart Please press the button to restart the switch RESTART THE SWITCH Note User will be disconnected from the Internet while the switch is restarting Using the System Tools 39 Any network users that are currently accessing the Internet will have their access interrupted while the restart takes place and they may need to reboot their computers when the restart has completed and the Switch is operational again Resetting and Backing Up Restoring Configuration Select the Configuration tab to display the Configura tion screen Figure 25 Configuration Screen Reset to Factory Default Configuration Please press the RESET button to restore configuration to factory RESET default Note All current configuratio
61. ords in italics Italics are used to m Emphasize a point m Denote a new term at the place where it is defined in the text m Identify menu names menu commands and software button names Examples From the Help menu select Contents Click OK ABOUT THIS GUIDE Related Documentation In addition to this guide each 3Com Baseline Switch 2250 Plus documentation set includes the following m Online Help Accessible from the Web interface provides information that helps you perform tasks using the Web interface m Release Notes Provide information about the cur rent software release including new features modifications and known problems Documentation Comments Your suggestions are very important to us They will help make our documentation more useful to you Please e mail comments about this document to 3Com at pddtechpubs_comments 3com com Please include the following information when con tacting us m Document title m Document part number on the title page m Page number if appropriate Example m 3Com Baseline Switch 2250 Plus User Guide m Part number DUA16476B SAAO01 m Page 25 Please note that we can only respond to comments and questions about 3Com product documentation at this e mail address Questions related to technical support or sales should be directed in the first instance to your network supplier 1 INTRODUCING THE BASELINE SWITCH This chapter provides an overv
62. overy searches the network for 3Com devices When detection is complete the Discovered Devices screen displays detected network devices Figure 6 Discovered Devices Screen 3Com Discovery V6 0 Discovered Devices Please choose a Device to configure Product Code _IP Address x Baseline Switch 2250 Plus 152 67 181 128 _Product Name lt Back Next gt Cancel 3 On the Discovered Devices screen click Baseline Switch 2250 Plus and then click Next The Completing the 3Com Discovery Application screen appears 4 Click Finish The logon dialog box for the Web interface appears Logging On to the Web Interface On the log on dialog box enter the administration user name and password to gain access to the Web interface Figure 7 Logon Dialog Box Connect to 152 67 181 250 l EJ C Remember my password Le jf ce To log on to the Web interface 1 In User name type admin 2 Leave the Password field blank 3 Click OK Navigating the Web Interface The Web interface has been designed to enable you to easily perform advanced configuration tasks and view information about the Switch Menu The menu is located on the left side of the Web inter face When you click an item on the menu the related screen appears in the main part of the inter face Navigating the Web Interface Figure 8 Switch Screen Layout Buttons CAS B
63. radio television technician for additional suggestions The user may find the following booklet prepared by the Federal Communications Commission helpful How to Identify and Resolve Radio TV Interference Problems This booklet is available from the U S Government Printing Office Washington DC 20402 Stock No 004 000 00345 4 In order to meet FCC emissions limits this equipment must be used only with cables which comply with IEEE 802 3 CE STATEMENT EUROPE This product complies with the European Low Voltage Directive 73 23 EEC and EMC Directive 89 336 EEC as amended by European Directive 93 68 EEC CSA STATEMENT This Class A digital apparatus meets all requirements of the Canadian Interference Causing Equipment Regulations Cet appareil numerique de la classe A respecte toutes les exigences du Reglement sur le materiel brouilleur du Canada VCCI STATEMENT COREL HRUBRESSRESRERAMBBS VCCI ORB BOC DIAZATRERMBECT TORE t RERA CHAT cR HELZIERIFLENBVUEFT COBRA MBICMRERT BEIBRENSCEMHBVET
64. ress Mode is set to Static The IP address that is assigned to the Switch also becomes the IP address for VLAN 1 Subnet Mask Specify a subnet mask address that you want to assign to the Switch This option is only available if P Address Mode is set to Static The default subnet mask is 255 255 0 0 Default Gateway Specify the IP address of the gateway router between this Switch and man agement stations on other network seg ments This option is only available if P Address Mode is set to Static MAC Address Read only field that displays the Switch s MAC or physical address 3 After you configure the Switch s IP address settings click Apply to save your changes Configuring Port Settings Using the Web interface you can configure the speed duplex and flow control settings of each port You can also view the current connection status of each port or shut down or disable ports Two tabs are available on the Port Configuration Configuring Port Settings 31 m Speed Duplex Sets the speed and duplex mode of the port Available options include auto 10 half duplex 10 full duplex 100 half duplex and 100 full duplex For 1000 Mbps connections see Speed Duplex for 1000 Mbps Connections below Auto or autonegotiation which is enabled by default sets the optimum combination of speed page and duplex that can be supported by both ends of m Basic Port Configuration the link a Advanced Port Configuration
65. s of the same VLAN but are on different switches to communicate pro vided that a port on each Switch is set to uplink and that these ports are connected CHAPTER A CONFIGURING THE SWITCH Figure 19 Uplink VLAN Configuration Endstation in VLAN 1 Desktop Server in VLAN 1 Desktop Endstation in VLAN 2 Desktop nait frei sed nas SETS mo Switch 1 Port 16 in VLANs 1 and 2 Uplink Switch 2 Port 8 in VLANs 1 and 2 Uplink Endstation ml Dos Y in VLAN 2 Desktop e un 1 El Server 7 in VLAN 2 Desktop Endstation in VLAN 1 Desktop To set up the configuration shown in Figure 19 do the following Create VLAN2 on both Switch 1 and Switch 2 and assign the same name to it You need not create VLAN1 since it exists by default On Switch 1 set the ports that you want to be part of VLAN2 to Desktop mode Set one port for example port 16 to Uplink mode Click Apply On Switch 2 set the ports that you want to be part of VLAN2 to Desktop mode Set one port for example port 8 to Uplink mode Click Apply Connect the uplink port on Switch 1 in this example port 16 to the uplink port on Switch 2 in this exam ple port 8 Those ports on Switch 1 that are members of VLAN2 can now communicate with those ports on Switch 2 that are members of VLAN2 Configuring Trunking gt Trunking also called link aggregation r
66. sh a valid network topology Using the System Tools 41 After all the bridges on the network have determined the configuration of their ports each bridge only for wards traffic between the Root Port and the ports that are the Designated Bridge Ports for each network segment All other ports are blocked which means that they are prevented from forwarding traffic Figure 27 Spanning Tree Screen Restart lt Configuration Upgrade Spanning Tree 802 1p Prioritization Spanning Tree BPDU Help Apply This allows you to forward or block and discard the 802 1D spanning tree BPDU packets m Forward Spanning tree BPDU packets received on a port are forwarded to all other ports m Block and Discard Spanning tree BPDUs received on a port are dropped The Switch does not for ward BPDUS to other ports The Switch does not participate as a bridge node in the spanning tree it can only be configured to for ward or block spanning tree BPDUs If the Switch is connected to other bridging devices such as switches that are part of the spanning tree network set the Switch to Forward If the Switch is con nected only to workstations it can be set to Block and Discard 802 1p Prioritization The Switch has priority queuing enabled which means all packets that are received are examined to see if they have been priority encoded If a packet has 42 CHAPTER A CONFIGURING THE SWITCH been priority encoded then the Swit
67. shot of the Switch s basic settings and versions of current components Information that you can view on the Summary Screen include m System Information Contains optional fields that you can fill out to identify the Switch It also shows the object ID and the time elapsed since the Switch was last started After you update any of the editable fields in this section click Apply to save your changes m Switch Information Shows the serial number total number of ports and the version of the hard ware board on the Switch m Management Software Information Shows the versions of the loader firmware boot ROM and code wm IP Information Shows the IP address settings of the Switch To modify any of these settings click P Settings This takes you to the IP Settings screen as shown in Figure 11 28 CHAPTER A CONFIGURING THE SWITCH Figure 9 Top Half of the Summary Screen System Information System Name Object ID Contact System Up Time 0 days 1 hours 59 minutes Switch Information Serial Number Number of Ports Hardware Version CE CE CE Management Software Information Loader Version If you request for technical assistance from 3Com Support you may be asked to print out the informa tion on this screen Old Password New Password Confirm Password To ensure that unauthorized users do not access the Web interface 3Com recommends that you set an admin pass
68. stopped flashing and is permanently green CAUTION Do not interrupt power to the Switch during the upgrade procedure If you do the soft ware may be corrupted and the Switch may not start up properly afterwards Configuring the Spanning Tree This administrative tool supports the configuration of the Switch to forward or block and discard 802 1D spanning tree BPDU packets Spanning tree is a bridge based system for providing fault tolerance on networks and can be used to detect and disable network loops The spanning tree ensures that the optimal path is maintained between spanning tree compliant networked devices by m Disabling redundant paths when the main paths are operational m Enabling redundant paths if the main paths fail Spanning tree uses a distributed algorithm to select a bridging device that serves as the root of the span ning tree network The bridging device known as the Root Bridge generates bridge protocol data units BPDUS on all ports at a regular interval known as the Hello Time All other spanning tree compliant devices on the network have a designated Root Port This is the Port nearest the Root Bridge and it is used for receiving the BPDUs initiated by the Root Bridge If a bridge does not get a Hello BPDU after a predeter mined interval the bridge assumes that the link to the Root Bridge is down This bridge will then initiate negotiations with other bridges to reconfigure the network to reestabli
69. threshold limits A broadcast storm is an incorrect packet sent out on a network that causes most hosts to respond all at once typically with wrong answers that start the pro cess over again Broadcast storms use substantial net work bandwidth and may cause network time outs Advanced settings include m Broadcast Storm Control Enables and disables broadcast storm control m Packet Rate Threshold Sets the broadcast storm threshold 64 to 95232000 bytes per packet Figure 13 Advanced Port Configuration Screen Advanced Port Configuration Help Packet Rate Threshold in Packets Per Second Apply 64 95232000 Enabled v 32000 Cancel Note Packet Threshold is ignored if Broadcast Storm Control is Disabled Broadcast Storm Control Default Port Settings If you do not configure the Switch s port settings the ports will use the following default settings m All ports are enabled m Autonegotiation is enabled m Flow control is enabled wm All ports are set to priority zero Configuring VLANs You can use the Switch to create VLANs to organize any group of ports into separate broadcast domains VLANS confine broadcast traffic to the originating group and help eliminate broadcast storms in large networks This also provides for a more secure and cleaner network environment You can create up to 256 VLANs add specific ports to a chosen VLAN so that the port can only communi cate with other ports on t
70. tion m Logging On to the Web Interface m Navigating the Web Interface CONNECTING TO THE WEB INTERFACE A computer that is connected to the Switch and that has a Web browser Requirements for Accessing the Web Interface To connect to the Web interface you need the fol lowing m The Discovery application which is included on 3Com Baseline Switch 2250 Plus CD ROM that is supplied with your Switch Running the Discovery Application The 3Com Baseline Switch 2250 Plus CD ROM con tains among others the Discovery application To use Discovery to connect to the Web interface do the following On a computer that is connected to the Switch insert the CD ROM into its CD drive Discovery should start automatically If it does not start automatically go to the Discovery folder on the CD ROM and then double click aiscovery exe The Welcome screen of Discovery appears 22 CHAPTER 3 CONNECTING TO THE WEB INTERFACE Figure 5 Welcome Screen of Discovery 3Com Discovery V6 0 Welcome This application will help you to find and configure your 3Com product Please select the network interface that your product is connected to IP address of adapter 169 254 197 87 Net gt Cancel 2 If the computer has multiple network adapters select the adapter that connects the computer to the Switch and then click Next If the computer has only one adapter click Next Disc
71. u niveau de cette prise m L appareil fonctionne une tension extr mement basse de s curit qui est conforme la norme IEC60950 Ces conditions ne sont maintenues que si l quipement auquel il est raccord fonctionne dans les m mes conditions France et P rou Uniquement Ce groupe ne peut pas tre aliment par un dispositif imp dance la terre Si vos alimentations sont du type imp dance la terre ce groupe doit tre ali ment par une tension de 230 V 2 P T par le biais d un transformateur d isolement rapport 1 1 avec un point secondaire de connexion portant l appella tion Neutre et avec raccordement direct la terre masse Cordon lectrique Consignes Importantes de S curit 53 Il doit tre agr dans le pays d utilisation Etats Unis et Canada Danemark Suisse Europe m Le cordon doit avoir recu l homologation des UL et un certificat de la CSA m Le cordon souple doit respecter titre minimum les sp cifications suivantes calibre 18 AWG type SV ou SJ 3 conducteurs m Le cordon doit tre en mesure d acheminer un courant nominal d au moins 10 A m La prise femelle de branchement doit tre du type mise la terre mise la masse et respecter la configuration NEMA 5 15P 15 A 125 V ou NEMA 6 15P 15 A 250 V La prise m le d alimentation doit respecter la section 107 2 D1 de la norme DK2 1a ou DK2 5a La prise m le d alimentation doit resp
72. ults on page 43 CAUTION Resetting the Switch to its factory defaults erases all your settings You will need to reconfigure the Switch after you reset it If these do not resolve the issue m Check the 3Com Knowledgebase for a solution To visit the 3Com Knowledgebase Web site start your Web browser and then enter http knowledgebase 3com com m Contact your 3Com network supplier for assis tance Connecting a Network Device 17 Connecting a Network Device To connect a network device to the Switch use Cate gory 5 unshielded or shielded screened 100 Ohm TP cables or Category 3 cables for 10 Mbps connec tions For optimal connections ensure that the cable length for each connection is not longer than 100 m 328 ft Figure 3 Connecting Devices to the Switch Endstations on switched Baseline 10 100 switch 100 Mbps connections OD Endstations on switched Baseline 10 100 switch 100 Mbps connections SEE 1000 Mbps copper or fiber connection to backbone or server workstation Baseline Switch 2250 Plus LI L gs Endstations on switched L L 10 or 100 Mbps 1000 Mbps link ma connection 10 or 100 Mbps link Server on switched 1000 Mbps connection To connect a device to the Switch 1 Connect one end of the cable to an RJ 45 port on the Switch 2 Connect the other end to the appropriate RJ
73. ults erases all your settings You will need to reconfigure the Switch after you reset it To reset the Switch to its factory defaults Using the tip of a pen or a similar object press the Recovery button on the rear panel of the Switch See Figure 1 for illustration Power off the Switch and then power it back on while keeping the Recovery button pressed Release the Recovery button gt Reset the Switch either by m Accessing the Web interface using Discovery and then pressing the RESET button on the Configura tion tab see Figure 29 of System Tools After you click RESET a confirmation message appears Click OK to confirm m Powering off the Switch and then powering it back on The Switch will perform automatic IP configuration after you reset it See Automatic IP Configuration on page 29 for more information Figure 29 Configuration Tab Restart Configuration Upgrade Spanning Tree lt 802 1p Prioritization Reset to Factory Default Configuration Please press the RESET button to restore configuration to factory deu eser Note All current configuration will be lost Forgotten Password If you forget the password to the Web interface after you set it you will need to reset the Switch to regain 44 CHAPTER 5 TROUBLESHOOTING access See Resetting to Factory Defaults on page 43 for instructions After resetting the Switch log on to the Web inter face using the de
74. unit m Air flow around the unit and through the vents in the side of the case is not restricted 3Com recom 14 p CHAPTER 2 INSTALLING THE SWITCH mendis that you provide a minimum of 25 mm or 1 in clearance m The air is as free of dust as possible m Temperature operating limits are not likely to be exceeded It is recommended that the unit is installed in a clean air conditioned environment It is always good practice to wear an anti static wrist strap when installing network equipment connected to a ground point If one is not available try to keep in contact with a grounded rack and avoid touching the unit s ports and connectors if possible Static dis charge can cause reliability problems in your equip ment Aufstellen des Switch Bei der Entscheidung wo Sie den Switch position ieren stellen Sie sicher das m Der Switch zug nglich ist und die Kabel leicht angeschlossen werden k nnen m Die Kabel nicht in der n he von elektrischen St rquellen befinden Das schlie t Aufzugss ch chte Mikrowellen und Klimaanlagen ein Elek tromagnetische Felder k nnen die Signale in den Kupferleitungen st ren und Fehler verursachen was die Verlangsamung Ihres Netzwerkes zur Folge haben kann m Weder Wasser noch Feuchtigkeit in das Geh use eindringen kann m Die Luftzirkulation um den Switch und durch die ffnungen des Geh uses nicht behindert wird 3Com empfiehlt das Sie 25mm 1 Inch Zwisch
75. ver assigned the IP address 192 168 0 123 to the Switch start your Web browser and then type http 192 168 0 123 Manually Assigned Static IP Address If you assigned a static IP address to the Switch you need to use that IP address to access the Web inter face the next time you want to configure the Switch For example if you assigned the Switch the IP address 192 168 0 123 start your Web browser and then type http 192 168 0 123 26 CHAPTER 3 CONNECTING TO THE WEB INTERFACE 4 This chapter provides information on how to config ure the Switch s advanced features Topics include m Viewing Summary Information m Changing the Admin Password m Modifying the IP Address Settings m Configuring Port Settings m Configuring VLANs m Configuring Trunking m Monitoring Traffic m Using the System Tools CONFIGURING THE SWITCH Upgrade the firmware Configuration Overview The Switch is shipped ready for use If you only want the Switch to function as a basic layer 2 switch you do not need to access the Web interface and config ure the Switch You only need to access the Web interface if you want to m Set the administration password to the Web inter face m Assign an IP address to the Switch m Configure the Switch s advanced features Viewing Summary Information The Summary screen which automatically loads after you log on to the Web interface provides a snap
76. wisted pair cable 1000BASE LX IEEE 802 3z specification for Gigabit Ethernet over 9 125 micron core single mode fiber cable 1000BASE SX IEEE 802 3z specification for Gigabit Ethernet over two strands of 50 125 or 62 5 125 micron core multi mode fiber cable 1000BASE T IEEE 802 3ab specification for Gigabit Ethernet over 100 ohm Category 5 5e or 6 twisted pair cable using all four wire pairs autonegotiation Autonegotiation is where two devices sharing a link automatically configure to use the best common speed The order of preference best first is 1000BASE T full duplex 100BASE TX full duplex 100BASE TX half duplex 10BASE T full duplex and 10BASE T half duplex Autonegotiation is defined in the IEEE 802 3 standard for Ethernet and is an opera tion that takes place in a few milliseconds Autonego tiation must be enabled for the 1000BASE T ports to operate at 1000 Mbps full duplex bandwidth The information capacity measured in bits per sec ond that a channel can transmit The bandwidth of Ethernet is 10 Mbps the bandwidth of Fast Ethernet is 100 Mbps and Gigabit Ethernet is 1000 Mbps category 3 cable One of five grades of Twisted Pair TP cabling defined by the EIA TIA 568 standard Category 3 is voice grade cable and can only be used in Ethernet net works 10BASE T to transmit data at speeds of up to 10 Mbps category 5 cable One of five grades of Twisted Pair TP cabling defined
77. word when you first configure the Switch Even if you do not intend to actively manage the switch 3Com recommends that you change the pass word to prevent unauthorized access to your net work Figure 10 Change Administration Password Screen Change Administration Password Changing the Admin Password To prevent unauthorized users from accessing the Web interface and modifying the Switch s settings the interface is password protected The default admin account settings are m User name admin m Password blank no password Note Password is case sensitive To set the admin password On the menu click Password The Change Adminis tration Password screen appears In Old Password type your current password By default the Switch does not have any password If this is your first time to access this screen or if you have not previously set a password leave this field blank In New Password type the password that you want to set 4 In Confirm Password retype the password you typed gt p in step 3 to confirm The password is case sensitive Click Apply If you want to modify the admin password later on follow the same procedure If you forget the administration password after you set it refer to Forgotten Password on page 43 for information on how to regain access to the Web interface Modifying the IP Address Settings To enable devices on the network to communi
78. y will be provided to you UNITED STATES GOVERNMENT LEGEND If you are a United States government agency then this documentation and the software described herein are provided to you subject to the following All technical data and computer software are commercial in nature and developed solely at private expense Software is delivered as Commercial Computer Software as defined in DFARS 252 227 7014 June 1995 or as a commercial item as defined in FAR 2 101 a and as such is provided with only such rights as are provided in 3Com s standard commercial license for the Software Technical data is provided with limited rights only as provided in DFAR 252 227 7015 Nov 1995 or FAR 52 227 14 June 1987 whichever is applicable You agree not to remove or deface any portion of any legend provided on any licensed program or documentation contained in or delivered to you in conjunction with this User Guide Unless otherwise indicated 3Com registered trademarks are registered in the United States and may or may not be registered in other countries 3Com and the 3Com logo are registered trademarks of 3Com Corporation Microsoft MS DOS Windows and Windows NT are registered trademarks of Microsoft Corporation IEEE and 802 are registered trademarks of the Institute of Electrical and Electronics Engineers Inc Netscape Navigator is a registered trademark of Netscape Communications JavaScript is a trademark of Sun Microsystems All oth

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