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® SuperStack 3 Switch 4900 Family Getting Started Guide Switch 4900 ( 3C17700 ) Switch 4900 SX ( 3C17702 ) Switch 4924 ( 3C17701 ) Switch 4950 ( 3C17706 ) http : / / www . 3com.com / Part No . DUA1770 - 0AAA05 Published September 2003
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3Com Corporation Copyright © 2003 , 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 350 Campus Drive , adaptation ) without written permission from 3Com Corporation . Marlborough , 3Com Corporation reserves the right to revise this documentation and to make changes in content from time MA 01752 - 3064 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 ! LICENSE.TXT . If you are unable to locate a copy , please contact 3Com and a copy 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 , the 3Com logo , and SuperStack are registered trademarks of 3Com Corporation . XRN is a trademark of 3Com Corporation . IEEE and 802 are registered trademarks of the Institute of Electrical and Electronics Engineers , Inc . Intel and Pentium are registered trademarks of Intel Corporation . Microsoft , MS - DOS , Windows , and Windows NT are registered trademarks of Microsoft Corporation . Novell and NetWare are registered trademarks of Novell , Inc . UNIX is a registered trademark in the United States and other countries , licensed exclusively through X / Open Company , Ltd . Netscape Navigator is a registered trademark of Netscape Communications . JavaScript is a trademark of Sun Microsystems . All other 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 .
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CONTENTS ABOUT THIS GUIDE Conventions 8 Related Documentation 9 Accessing Online Documentation 9 Documentation Comments 10 1 INTRODUCING THE SUPERSTACK 3 SWITCH 4900 FAMILY About the Switches 12 Summary of Hardware Features 13 Switch — Front View Detail 14 100 / 1000BASE - T and 10 / 100 / 1000BASE - T Ports 16 1000BASE - SX Ports 16 GBIC Ports 16 LEDs 17 Switch — Rear View Detail 18 Unit Information Label 19 Power Socket 19 Redundant Power System Socket 19 Console Port 20 Expansion Module Slot 20 Default Settings 20 2 INSTALLING THE SWITCH Package Contents 22 Choosing a Suitable Site 22 Rack - mounting 23 Placing Units On Top of Each Other 24 Creating an XRN Distributed Fabric 24 How To Interconnect Units 25 Rules For Interconnecting Units 25 The Power - up Sequence 27
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Powering - up the Switch 27 Checking for Correct Operation of LEDs 27 Connecting a Redundant Power System 27 Choosing the Correct 10 / 100 / 1000BASE - T Cables 28 Choosing the Correct Fiber Cables 29 Switch 4950 — GBIC Operation 29 Approved GBIC Transceivers 29 Inserting a GBIC Transceiver 30 Removing a GBIC Transceiver 31 3 SETTING UP FOR MANAGEMENT Setting Up Overview 34 IP Configuration 35 Preparing for Management 36 Manually Configuring IP Information 37 Connecting to a Front Panel Port 37 Connecting to the Console Port 40 Viewing Automatically Configured IP Information 43 Using 3Com Network Supervisor 43 Connecting to the Console Port 44 Methods of Managing a Switch 46 Command Line Interface Management 46 Web Interface Management 47 SNMP Management 47 Setting Up Command Line Interface Management 48 CLI Management via the Console Port 48 CLI Management over the Network 48 Setting Up Web Interface Management 49 Pre - requisites 49 Web Management Over the Network 50 Setting Up SNMP Management 51 Pre - requisites 51 Default Users and Passwords 51 Changing Default Passwords 52 4 PROBLEM SOLVING Solving Problems Indicated by LEDs 54
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Solving Hardware Problems 55 Solving Communication Problems 57 Solving Software Upgrade Problems 58 A SAFETY INFORMATION Power Cord Set — Japan 59 Important Safety Information 60 L’information de Sécurité Importante 63 Wichtige Sicherheitsinformationen 66 B PIN - OUTS Null Modem Cable 69 PC - AT Serial Cable 69 Modem Cable 70 RJ - 45 Pin Assignments 70 C TECHNICAL SPECIFICATIONS D OBTAINING SUPPORT FOR YOUR PRODUCT Register Your Product to Gain Service Benefits 75 Purchase Value - Added Services 75 Troubleshoot Online 75 Access Software Downloads 76 Contact Us 76 Telephone Technical Support and Repair 76 INDEX REGULATORY NOTICES
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ABOUT THIS GUIDE This guide provides all the information you need to install and use the following Switches in their default state : ® ■ SuperStack 3 Switch 4900 ( 3C17700 ) ® ■ SuperStack 3 Switch 4900 SX ( 3C17702 ) ® ■ SuperStack 3 Switch 4924 ( 3C17701 ) ® ■ SuperStack 3 Switch 4950 ( 3C17706 ) This guide is intended for use with all the 4900 Family Switches listed above . For illustrative purposes all pictures and example screens show the 4900 model , however , all procedures apply to all the other Switches listed unless otherwise stated . The guide is intended for use by network administrators who are responsible for installing and setting up network equipment ; consequently , it assumes a basic working knowledge of LANs ( Local Area Networks ) . If the information in the release notes that are shipped with your product differ 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 ) or HTML on the 3Com World Wide Web site : http : / / www . 3com.com /
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8 ABOUT THIS GUIDE Conventions Table 1 and Table 2 list conventions that are used throughout this guide . Table 1 Notice Icons Icon Notice Type Description Information note Information that describes important features or instructions . Caution Information that alerts you to potential loss of data or potential damage to an application , system , or device . Warning 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 . Syntax The word “ syntax � means that you must evaluate the syntax provided and then supply the appropriate values for the placeholders that appear in angle brackets . Example : To change your password , use the following syntax : system password < password > In this example , you must supply a password for < password > . Commands The word “ command � means that you must enter the command exactly as shown and then press Return or Enter . Commands appear in bold . Example : To display port information , enter the following command : bridge port detail The words “ enter � When you see the word “ enter � in this guide , you must type and “ type � something , and then press Return or Enter . Do not press Return or Enter when an instruction simply says “ type . � Keyboard key names If you must press two or more keys simultaneously , the key names are linked with a plus sign ( + ) . Example : Press Ctrl + Alt + Del Words in italics Italics are used to : ■ Emphasize a point . ■ Denote a new term at the place where it is defined in the text . ■ Identify menu names , menu commands , and software button names . Examples : From the Help menu , select Contents . Click OK .
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Related Documentation 9 Related In addition to this guide , each Switch documentation set includes the Documentation following : â–  Management Quick Reference Guide This guide contains : â–  a list of software features supported by each Switch . â–  a summary of the web interface and command line interface commands for the Switch . â–  Release Notes These notes provide information about the current software release , including new features , modifications , and known problems . â–  Implementation Guide This guide contains information on the features supported by your Switch and how they can be used to optimize your network . It is supplied in PDF format on the CD - ROM that accompanies the Switch . â–  Management Interface Reference Guide This guide provides detailed information about the web interface and command line interface that enable you to manage the Switch . It is supplied in HTML format on the CD - ROM that accompanies the Switch . There are other publications you may find useful : â–  Documentation accompanying the Advanced Redundant Power System . â–  Documentation accompanying the Expansion Modules . â–  Documentation accompanying 3Com Network Supervisor . This is supplied on the CD - ROM that accompanies the Switch . Accessing Online The CD - ROM supplied with your Switch contains the following online Documentation documentation : â–  Implementation Guide ( PDF format ) â–  Management Interface Reference Guide ( HTML format ) â–  Other documentation relating to the Switch 4900 Family ( PDF format )
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10 ABOUT THIS GUIDE To access the online documentation from the CD - ROM : 1 Insert the CD - ROM into the relevant CD - ROM drive . If your PC has auto - run enabled , a splash screen will be displayed automatically . 2 Select the Documentation section from the contents page . If the online documentation is to be accessed from a local drive or server , you will need to access the CD - ROM contents via the root directory and copy the files from the CD - ROM to a suitable directory . â–  The HTML Reference Guide is stored in the Docs / referenceguide on the CD - ROM . The documentation is accessed using the index.htm file . â–  The PDF Implementation Guide is stored in the Docs / implementation directory of the CD - ROM . 3Com recommends that you copy the Docs / referenceguide directory as a whole to maintain the structure of the files . Documentation Your suggestions are very important to us . They will help make our Comments 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 commenting : Document title , Document part number ( on the title page ) and Page number ( if appropriate ) . Example : Part Number DUA1770 - 0AAA0x , SuperStack 3 Switch 4900 Family Getting Started Guide , Page 21
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INTRODUCING THE 1 SUPERSTACK 3 SWITCH 4900 AMILY F This chapter contains introductory information about the Switch 4900 , 4900 SX , 4924 and 4950 and how they can be used in your network . It covers summary information about the hardware . The information for all the Switches in the Switch 4900 Family is the same unless otherwise stated . ■ About the Switches ■ Summary of Hardware Features ■ Switch — Front View Detail ■ 100 / 1000BASE - T and 10 / 100 / 1000BASE - T Ports ■ 1000BASE - SX Ports ■ GBIC Ports ■ LEDs ■ Switch — Rear View Detail ■ Unit Information Label ■ Power Socket ■ Redundant Power System Socket ■ Console Port ■ Expansion Module Slot ■ Default Settings
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12 CHAPTER 1 : INTRODUCING THE SUPERSTACK 3 SWITCH 4900 FAMILY About the Switches ■ The Switch 4900 connects your existing 100 Mbps devices and high - performance workgroups with a 1000 Mbps copper backbone or server connection . ■ The Switch 4900 SX connects your existing 1000 Mbps devices and high - performance workgroups with a 1000BASE - SX fiber backbone or server connection . ■ The Switch 4924 connects your existing 10 Mbps and 100 Mbps devices and high - performance workgroups to a 1000 Mbps copper backbone or server connection . ■ The Switch 4950 is a 10 / 100 / 1000 Mbps mixed media device that allows you to connect your existing 10 / 100 / 1000 Mbps devices and high - performance workgroups to a fiber or copper gigabit backbone or server connection . You can also interconnect any combination of two Switches from the ® 4900 Family or 3Com Switch 40x0 Family to create an XRN SuperStack Distributed Fabric . This allows you to create a highly resilient core around which you can build your network . For more information about on interconnecting Switches , see “ Creating an XRN Distributed Fabric � . For more information about 3Com XRN Technology and how to page 24 use it in your network , refer to the Implementation Guide on the CD - ROM that accompanies the Switch . For information about using the software features of the Switch , refer to the “ SuperStack 3 Switch Management Interface Reference Guide � on the CD - ROM that accompanies the Switch .
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About the Switches 13 Summary of Table 3 summarizes the hardware features that are supported by the Hardware Features Switches . Table 3 Hardware features Feature Switch 4900 Family Fast Ethernet Switch 4900 : 12 Auto - negotiating 100BASE - TX / 1000BASE - T and Gigabit ports Ethernet Ports Switch 4900 SX : 12 Auto - negotiating 1000BASE - SX ports Switch 4924 : 24 Auto - negotiating 10BASE - T / 100BASE - TX / 1000BASE - T ports Switch 4950 : 12 Auto - negotiating 10BASE - T / 100BASE - TX / 1000BASE - T , 6 1000BASE - SX and 6 GBIC ports Addresses â–  Up to 12,000 supported â–  Up to 64 permanent entries Forwarding Store and Forward Modes Duplex Modes â–  Half duplex only supported on 10BASE - T / 100BASE - TX / 1000BASE - T ports in 10 / 100 Mbps mode â–  All 1000 Mbps ports are full duplex only Flow Control Supported on all ports Smart â–  Supported on all 10BASE - T / 100BASE - TX / 1000BASE - T ports auto - sensing â–  Not supported on 1000BASE - SX and GBIC ports Traffic Supported ( IEEE Std 802.1D , 1998 Edition ) Prioritization Four traffic queues per port Layer 3 Support for wire - speed IP routing Switching RPS Support Connects to SuperStack 3 Advanced Redundant Power System ( ARPS ) ( 3C16071B ) XRN Support eXpandable Resilient Networking ( XRN ) support . Allows interconnection of two units to create a Distributed Fabric . Mounting 19 - inch rack or stand - alone mounting
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14 CHAPTER 1 : INTRODUCING THE SUPERSTACK 3 SWITCH 4900 FAMILY Switch — Front Figure 1 Switch 4900 — front view View Detail Switch 4900 Status Unit Module green = 1000 Mbps yellow = 100 Mbps on = enabled , link OK flashing = disabled 10 5 6 1 2 12 4 8 9 3 11 7 Packet 1 2 Power / Self Test 12x 7x 1x 6x 10 5 6 1 2 12 4 8 9 3 11 7 3 4 Status Layer 3 3C17700 SuperStack 3 3C17700 Power / Self Test LED Port Status LEDs and Layer 3 LED Module Status LEDs 100BASE - TX / 1000BASE - T Ports 100BASE - TX / 1000BASE - T Ports Unit LEDs Figure 2 Switch 4900 SX — front view
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Switch — Front View Detail 15 Figure 3 Switch 4924 — front view Figure 4 Switch 4950 — front view WARNING : RJ - 45 Ports . These are shielded RJ - 45 data sockets . They cannot be used as standard traditional 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 connected to these data sockets .
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16 CHAPTER 1 : INTRODUCING THE SUPERSTACK 3 SWITCH 4900 FAMILY 100 / 1000BASE - T and The 100BASE - TX / 1000BASE - T and 10BASE - T / 100BASE - TX / 1000BASE - T 10 / 100 / 1000BASE - T ports have RJ - 45 connectors and are configured as Auto MDIX Ports ( cross - over ) . The default state for these ports is auto - negotiation enabled , where the speed , duplex and flow control modes of a link are automatically detected to provide the highest available bandwidth with the link partner . Alternatively , auto - negotiation can be disabled . These ports can be manually configured to 10 Mbps half duplex ( if supported ) , 100 Mbps half duplex , 10 Mbps full duplex ( if supported ) , or 100 Mbps full duplex . It is not possible to manually configure a 1000BASE - T link as auto - negotiation is mandatory in the 1000BASE - T standard . The maximum segment length is 100 m ( 328 ft ) over Category 5 twisted pair cable . 1000BASE - T operation only supports full - duplex mode . 10BASE - T ( 10 Mbps ) is only supported on Switch 4924 and 4950 . 1000BASE - SX Ports The default state for these ports is auto - negotiation enabled , where the speed , duplex and flow control modes are negotiated . As the speed and duplex modes are fixed by the media type , only the flow control is negotiated with the link partner . Alternatively , auto - negotiation can be disabled and the flow control setting can be manually configured . 1000BASE - SX ports do not support auto - negotiation of speed and only support full duplex mode . GBIC Ports GBIC ports support fiber Gigabit Ethernet short - wave ( SX ) , long - wave ( LX ) and long - haul ( LH70 ) GBIC transceivers in any combination . This offers you the flexibility of using GBIC transceivers to provide connectivity between the Switch and remote 1000 Mbps workgroups or to create a high capacity aggregated link backbone connection . The default state for these ports is auto - negotiation enabled , where the speed , duplex and flow control modes are negotiated . As the speed and duplex modes are fixed by the media type , only the flow control is negotiated with the link partner . Alternatively , auto - negotiation can be disabled and the flow control setting can be manually configured .
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Switch — Front View Detail 17 LEDs Table 4 lists LEDs visible on the front of the Switch , and how to read their status according to color . For information on using the LEDs for problem on page 27 . solving , see “ Checking for Correct Operation of LEDs � Table 4 LED behavior LED Color Indicates Port LEDs Packet Yellow Packets are being transmitted / received on the port . Off No packets are being transmitted / received on the port . Status Green A high speed ( 1000 Mbps ) link is present , and the port is enabled . Green flashing A high speed ( 1000 Mbps ) link is present , but the port is disabled . Yellow A low speed ( 100 Mbps on 4900 , 10 / 100 Mbps on 4924 / 4950 ) link is present , and the port is enabled . ( Not applicable on 4900 SX . ) Yellow flashing A low speed ( 100 Mbps on 4900 , 10 / 100 Mbps on 4924 / 4950 ) link is present , but the port is disabled . ( Not applicable on 4900 SX . ) Off No link is present . Module LEDs Packet Yellow Packets are being transmitted / received on the port . Off No packets are being transmitted / received on the port . Status Green The Module is installed and supported . The Link Status has been determined for a single port Module . Yellow The Module is installed and supported . The Module has multi - ports or there is no link for a single port Module . Yellow flashing The Module is installed but not supported . Note that the Switch will continue to operate normally . Yellow flashing A port on the Module has failed POST and has been ( fast ) automatically disabled . Off The Module is not installed . Unit LEDs 1 – 4 Green Determines the identity of the Switch when interconnected to another Switch to create an XRN Distributed Fabric and that a link is present . Off A fault has occurred . Power / Self Test LED Green The Switch is powered - up and operating normally .
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18 CHAPTER 1 : INTRODUCING THE SUPERSTACK 3 SWITCH 4900 FAMILY LED Color Indicates Green flashing The Switch is either downloading software or is initializing ( which includes running a Power On Self Test ) . Yellow The Switch has failed its Power On Self Test . Off The Switch is not receiving power . Layer 3 LED Green The Switch software supports Layer 3 . Off The Switch software does not support Layer 3 . Switch — Rear Figure 5 Switch 4900 — rear view View Detail Figure 6 Switch 4900 SX — rear view
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Switch — Rear View Detail 19 Figure 7 Switch 4924 — rear view Figure 8 Switch 4950 — rear view Unit Information This label shows the following : Label ■ The 3Com product name of the Switch ■ The 3Com 3C number of the Switch ■ The unique MAC address ( Ethernet address ) of the Switch ■ The serial number of the Switch You may need this information for fault reporting purposes . Power Socket The Switch automatically adjusts its power setting to any supply voltage in the range 90 - 240 VAC . Redundant Power To protect against internal power supply failure , you can use this socket System Socket to connect a SuperStack 3 Advanced Redundant Power System ( RPS ) to on page 27 . the Switch . See “ Connecting a Redundant Power System �
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20 CHAPTER 1 : INTRODUCING THE SUPERSTACK 3 SWITCH 4900 FAMILY Console Port The console port allows you to connect a terminal and perform remote or local out - of - band management . The console port uses a standard null modem cable and is set to auto - baud ( up to a maximum of 19200 baud ) , 8 data bits , no parity and 1 stop bit . Expansion Module You can use this slot to install an Expansion Module . Contact your Slot supplier for further information on the range of Expansion Modules supported by your Switch . When an Expansion Module is not installed , ensure the WARNING : blanking plate is fitted by tightening all screws with a suitable tool . Default Settings Table 5 shows the default settings for the Switches . If you initialize one of the Switch units , it is returned to these defaults . Table 5 Default Setting Feature Switch 4900 Family Port Status Enabled Port Speed Auto - negotiated Duplex Mode Auto - negotiated Flow Control Auto - negotiated Broadcast Storm Control Enabled High threshold : 3000 broadcast frames per second — Notify and filter Low threshold : 1500 broadcast frames per second — Notify and unfilter Virtual LANs ( VLANs ) All ports belong to the untagged Default VLAN ( VLAN 1 ) Multicast Filtering IGMP filtering enabled Rapid Spanning Tree Protocol Enabled Link Aggregation Control Disabled per port Protocol ( LACP ) Smart Auto - sensing Switch 4900 , 4924 , and 4950 : Enabled Switch 4900 SX : Not applicable * IP Address 169.254.100.100 Subnet Mask 255.255.0.0 * This default IP address is used if the unit is operating in standalone mode , and / or no other Switches on the network have this IP address . If this default IP address is already in use then the Switch detects this and configures itself with an IP address in the range 169.254.1.0 to 169.254.254.255 .
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INSTALLING THE SWITCH 2 This chapter contains the information you need to install and set up the Switch . It covers the following topics : ■ Package Contents ■ Choosing a Suitable Site ■ Rack - mounting ■ Placing Units On Top of Each Other ■ Creating an XRN Distributed Fabric ■ The Power - up Sequence ■ Switch 4950 — GBIC Operation WARNING : Safety Information . Before installing or removing any components from the Switch or carrying out any maintenance procedures , you must read the safety information provided in Appendix A of this guide . AVERTISSEMENT : Consignes de sécurité . Avant d'installer ou d'enlever tout composant du Switch ou d'entamer une procédure de maintenance , lisez les informations relatives à la sécurité qui se trouvent dans l'Appendice A de ce guide . VORSICHT : Sicherheitsinformationen . Bevor Sie Komponenten aus dem Switch entfernen oder dem Switch hinzufuegen oder Instandhaltungsarbeiten verrichten , lesen Sie die Sicherheitsanweisungen , die in Anhang A in diesem Handbuch aufgefuehrt sind .
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22 CHAPTER 2 : INSTALLING THE SWITCH Package Contents ■ Switch unit ■ CD - ROM ■ This Guide ■ Management Quick Reference Guide ■ Release Notes ■ Warranty Flyer ■ Power Cord ■ 2 x securing brackets ■ 6 x screws ■ 4 x rubber feet Choosing a Suitable The Switch is suited for use in an internal wiring closet , a network room , Site or telecommunications room , where it can be mounted in a standard 19 - inch equipment rack , or free - standing . CAUTION : Ensure that the ventilation holes are not obstructed . To ensure this product provides optimum performance , high speed fans are used to provide ventilation . These fans have a high audible output . When deciding where to position the Switch , ensure that : ■ Cabling is located away from : ■ sources of electrical noise such as radios , transmitters and broadband amplifiers . ■ power lines and fluorescent lighting fixtures . ■ The Switch is accessible and cables can be connected easily . ■ Water or moisture cannot enter the case of the Switch . ■ Air flow is not restricted around the Switch or through the vents in the side of the Switch . 3Com recommends that you provide a minimum of 25 mm ( 1 in . ) clearance . ■ Air temperature around the Switch does not exceed 40 ° C ( 104 ° F ) . If the Switch is installed in a 19 - inch rack or closed assembly its local air temperature may be greater than room ambient temperature .
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Rack - mounting 23 â–  The air is as free from dust as possible . â–  The unit is installed in a clean , air conditioned environment . â–  No more than four Switch units are placed on top of one another , if the units are free - standing . â–  The Switch is situated away from sources of conductive ( electrical ) dust , for example laser printers . â–  The AC supply used by the Switch is separate to that used by units that generate high levels of AC noise , for example air conditioning units and laser printers . Rack - mounting The Switch is 1.5U and will fit in most standard 19 - inch racks . However , as each Switch requires a shelf or runner to support its weight , you may need to allow a 2U space within the rack for each Switch . WARNING : The Switch should only be used in a rack if it is mounted on runners , a shelf , or a tray to support the weight . The rack - mount kits alone are not sufficient to support the weight of the switch . The rack - mount kits must not be used to suspend the Switch from under a table or desk , or attach it to a wall . CAUTION : Disconnect all cables from the Switch before continuing . Remove all self adhesive pads from the underside of the Switch if they have been fitted . CAUTION : You must use a shelf or support that will not obstruct the air flow through the side panels of the Switch . To rack - mount your Switch : 1 Place the Switch the right way up on a hard flat surface , with the front facing towards you . 2 Locate a securing bracket over the mounting holes on one side of the 9 . Switch , as shown in Figure 3 Insert the three screws and tighten with a suitable screwdriver .
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24 CHAPTER 2 : INSTALLING THE SWITCH Figure 9 Fitting a bracket for rack - mounting You must use the screws supplied with the securing brackets . Damage caused to the unit by using incorrect screws invalidates your warranty . 4 Repeat steps 2 and 3 for the other side of the Switch . 5 Insert the Switch into the 19 - inch rack and secure with suitable screws ( not provided ) . Ensure that ventilation holes are not obstructed . 6 Connect network cabling . Placing Units On If the Switch units are free - standing , up to four units can be placed one ® Top of Each Other 3 Switch on top of the other . If you are mixing a variety of SuperStack and Hub 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 corner . 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 . Creating an XRN SuperStack 3 Switch 4900 Family units and 3Com Switch 40x0 units can Distributed Fabric be interconnected to create an XRN Distributed Fabric and then treated as a single manageable unit with one IP address . A combination of any two of these units is allowed to be interconnected .
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Creating an XRN Distributed Fabric 25 How To Interconnect You can interconnect your Switches to create an XRN Distributed Fabric Units using one of the following methods : ■ XRN Interconnect Kit ( 3C17715 ) — consists of two XRN Interconnect Modules and a 1 meter ( 3.28 feet ) Interconnect cable . Should you wish to connect two Switch units together that are located in separate racks you can obtain a 5 meter ( 16.4 feet ) Interconnect cable network supplier for further information . ( 3C17722 ) . Contact your ■ SuperStack 3 Switch 4900 Family GBIC Module ( 3C17714 ) operating in XRN mode . Using the GBIC Module in this way means you can have an Fabric Interconnect extended up to 70 Km ( 43.5 miles ) between the units , if necessary ( dependant upon GBIC transceiver type ) . For a detailed description of how to create an XRN Distributed Fabric using either of these methods , please refer to the user documentation that accompanies the Kit or the GBIC Module . The documentation can also be located on the 3Com Web site . Figure 10 Two Switch 4900 units interconnected using the XRN Interconnect Kit Switch 4900 Serial 3C17700 No XXX / XXXXXXXXXX MAC Addr : XXXXXXXXXXXX SUPPLY DATA V - 90 - 240 Hz A 50 / 60 4.5 I INPUT REFER TO MANUAL INSTRUCTION V FOR A CORRECT Max 27 12 Console Unit ( max ) 1 19200,8,1 , N Unit Activity S / N : 2 XXXX / 7XXXXXXXXX Status Switch 4900 Serial 3C17700 No XXX / XXXXXXXXXX MAC Addr : XRN XXXXXXXXXXXX Interconnect Module ( 3C17716 ) SUPPLY DATA V - 90 - 240 Hz A 50 / 60 4.5 I INPUT REFER TO MANUAL INSTRUCTION V FOR A CORRECT Max 27 12 Console Unit ( max ) 1 19200,8,1 , N Unit Activity S / N : 2 XXXX / 7XXXXXXXXX Status XRN Interconnect Module ( 3C17716 ) Rules For This information is also provided in the user documentation that Interconnecting Units accompanies the XRN Interconnect Kits or GBIC module . ■ The maximum number of Switch units that can be interconnected is two . ■ Both Switches must have an unused expansion slot to allow an Interconnect Module or a GBIC Module to be fitted . ■ The XRN Interconnect Module and the GBIC Module are NOT hot - swappable or hot - insertable . Ensure that the Switch is powered off before inserting or removing a Module .
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26 CHAPTER 2 : INSTALLING THE SWITCH â–  Only 3Com XRN Interconnect Cables can be used to connect two XRN Interconnect Modules . â–  It is not possible to interconnect the SuperStack 3 Switch 4900 Family and 3Com Switch 40x0 units with any other 3Com device . â–  3Com strongly recommends that you upgrade all Switches to be interconnected to the latest software agent . â–  3Com recommends that you initialize a Switch unit that has previously been used elsewhere in your network before you interconnect to an existing unit . If you do not initialize the unit , problems may be caused by conflicting Switch configurations . â–  When the Switch units are interconnected using the XRN Interconnect Kit they are assigned a unit number dependent on which XRN Interconnect Cable end is connected to which Switch . That is , the Switch with the blue cable end will be assigned the identity of Unit 1 and the Switch with the yellow cable end will be assigned the identity of Unit 2 . â–  When the Switch units are in an XRN Distributed Fabric created using the GBIC Module , they assume their unit IDs from the MAC address of the Switch unit within which the GBIC Module is installed . So the unit with the lowest MAC address will assume Unit 1 ID and the unit with the highest MAC address will assume Unit 2 ID . â–  To create an XRN Distributed Fabric using a GBIC Module you will need GMS software version 4.0 or later ( Advanced Feature License 3C1770V40 ) to be installed on both Switch units . â–  Only direct XRN mode to XRN mode connections are supported when the GBIC Module is operating in XRN mode . For a detailed description of how XRN Technology operates and implementation guidelines , please refer to the Implementation Guide on the CD - ROM that accompanies your Switch or on the 3Com Web site .
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The Power - up Sequence 27 The Power - up The following sections describe how to get your Switch powered - up and Sequence ready for operation . Powering - up the Use the following sequence of steps to power - up the Switch . Switch 1 Plug the power cord into the power socket at the rear of the Switch . 2 Plug the other end of the power cord into your power outlet . The Switch powers - up and runs through its Power On Self Test ( POST ) , which takes approximately 10 seconds . Checking for Correct During the Power On Self Test , all ports on the Switch are disabled and Operation of LEDs the LEDs light in a rapid sequence . When the POST has completed , check the Power / Self Test LED to make shows possible colors sure that your Switch is operating correctly . Table 6 for the LED . Table 6 Power / Self Test LED Colors Color State Green The Switch is powered - up and operating normally . Yellow The Switch has failed its Power On Self Test ( POST ) because of an internal problem . Off The Switch is not receiving power . If there is evidence of a problem , see “ Solving Problems Indicated by LEDs � on page 54 for a list of suggested solutions . Connecting a You can connect a SuperStack 3 Advanced Redundant Power System to Redundant Power the Switch . This unit , which is also known as an RPS , is designed to System maintain the power to your Switch if a power supply failure occurs . For normal redundancy , the unit requires one Type 3 Power Module ( part number 3C16075 ) . For full redundancy , the unit requires two Type 3 Power Modules combined using a Type 3 Y - Cable ( part number 3C16077 ) .
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28 CHAPTER 2 : INSTALLING THE SWITCH WARNING : If you are connecting the Switch to a Type 3 Power Module , read the Safety Information section in the Type 3 Power Module User Guide . CAUTION : The Switch can only use a SuperStack Advanced Redundant Power System output . CAUTION : The Switch has no ON / OFF switch ; the only method of connecting or disconnecting mains power is by connecting or disconnecting the power cord . Choosing the Correct If your Switch has 10 / 100 / 1000BASE - T ports , these ports are Auto - MDIX , 10 / 100 / 1000BASE - T that is they have a cross - over capability . These ports can automatically Cables detect whether to operate in MDI or MDIX mode . Therefore you can make a connection to one of the ports with a straight - through ( MDI ) or a cross - over cable ( MDIX ) . The Auto - MDIX feature only operates when auto - negotiation is enabled . If auto - negotiation is disabled , all the Switch ports are configured as MDIX ( cross - over ) . If you want to make a connection to another MDIX port , you need a cross - over cable . Many ports on workstations and servers are configured as MDI ( straight - through ) . If you want to make a connection to an MDI port , you need to use a standard straight - through 7 . cable . See Table 3Com recommends that you use at least Category 5 twisted pair cable — the maximum segment length for this type of cable is 100 m ( 328 ft ) . Table 7 Cables required to connect the Switch to other devices if auto - negotiation is disabled Cross - over Cable Straight - through Cable Switch to Switch ✓ ✕ ( MDIX to MDIX ) Switch to Hub ✓ ✕ ( MDIX to MDIX ) Switch to PC ( NIC ) ✕ ✓ ( MDIX to MDI ) CAUTION : If you want to install the Switch using a Category 5E or Category 6 cable , 3Com recommends that you briefly connect the cable
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Switch 4950 — GBIC Operation 29 to a grounded port before connecting network equipment . If you do not , the cable’s Electrostatic Discharge ( ESD ) may damage the Switch's port . You can create a grounded port by connecting all wires at one end of a UTP cable to an earth ground point , and the other end to a female RJ - 45 connector located , for example , on a Switch rack or patch panel . The RJ - 45 connector is now a grounded port . Choosing the Correct If your Switch has fiber ports you can choose from the following cable Fiber Cables options : ■ The 1000BASE - SX ports can be connected to multimode fiber cables only . ■ The 1000BASE - LX and 1000BASE - LH70 GBIC ports use multimode or single - mode fiber optic cables . CAUTION : 3Com recommends that you use MT - RJ cables that do not contain alignment pins as these are provided by the fiber socket . Cables that contain alignment pins can cause damage to your Switch . For detailed information on fiber cable specifications , refer to the SuperStack 3 Implementation Guide on the CD - ROM that accompanies your Switch . If you wish to connect a 1000BASE - SX MT - RJ port to a fiber port with a different type of connector , for example , SC or ST please contact your network supplier for a suitable patch cable . Switch 4950 — GBIC The following sections describes how to insert a GBIC transceiver into a Operation GBIC port on a Switch 4950 . GBIC transceivers are hot - insertable and hot - swappable . You can remove them from and insert then into any GBIC port without having to power down the Switch . Approved GBIC The following list of approved GBIC transceivers is correct at the time of Transceivers publication . ■ 3CGBIC91 GBIC ( SX ) ■ 3CGBIC92 GBIC ( LX ) ■ 3CGBIC97 GBIC ( LH70 )
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30 CHAPTER 2 : INSTALLING THE SWITCH To access the latest list of approved GBIC transceivers for the Switch on the 3Com Corporation World Wide Web site , enter this URL into your internet browser : http : / / www . 3com.com Inserting a GBIC To be recognised as valid , the GBIC transceiver must have the following Transceiver characteristics : ■ 1000BASE - SX , 1000BASE - LX or 1000BASE - LH70 media type : ■ 1000BASE - SX GBIC transceiver Use this transceiver to connect the Switch directly to a multimode fiber - optic cable . ■ 1000BASE - LX GBIC transceiver Use this transceiver to connect the Switch directly to a single - mode fiber - optic cable or to multimode fiber using a conditioned launch cable . ■ 1000BASE - LH70 GBIC transceiver Use this transceiver to connect the Switch directly to a single - mode fiber - optic cable or to multimode fiber using a conditioned launch cable . ■ Fiber SC connector ■ Type 4 GBIC with internal EEPROM fitted . If the GBIC transceiver is faulty , it will not operate within the Switch . See on page 55 . “ Solving Hardware Problems � 3Com recommends that you only use GBICs supplied by 3Com . If the GBIC transceiver is invalid it will not be recognised by the Switch . Use the following sequence of steps to activate the GBIC ports . 1 Hold the transceiver so that the fiber connector ( SC ) is toward you and 1 . the product label is visible , as shown in Figure 1 2 Gently slide the transceiver into the GBIC port until it clicks into place . CAUTION : GBIC transceivers are keyed and can be properly inserted only one way . If the transceiver does not click when you insert it , remove it , turn it over , and reinsert it .
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Switch 4950 — GBIC Operation 31 Figure 11 Inserting a GBIC Transceiver into a Switch 4950 3 The transceiver connects to the network using a duplex SC connector . Attach a male duplex SC connector on the network cable into the duplex SC connector on the transceiver . 4 Connect the other end of the cable to a device fitted with an appropriate Gigabit Ethernet connection . 5 Check the LEDs on the front of the Switch to ensure that it is operating on page 17 for more information . correctly . Refer to “ LEDs � Removing a GBIC If you wish to remove the transceiver , compress the side tabs and gently Transceiver pull the transceiver out of the port .
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32 CHAPTER 2 : INSTALLING THE SWITCH
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SETTING UP FOR MANAGEMENT 3 Your Switch can operate in its default state , that is , you can install it and it will work straight away ( plug - and - play ) . However , to make full use of the features offered by the Switch , and to change and monitor the way it works , you have to access the management software that resides on the Switch . This is known as managing the Switch . Managing the Switch can help you to improve the efficiency of the Switch and therefore the overall performance of your network . This chapter explains the initial set up of the Switch and the different methods of accessing the management software to manage a Switch . It covers the following topics : â–  Setting Up Overview â–  Manually Configuring IP Information â–  Viewing Automatically Configured IP Information â–  Methods of Managing a Switch â–  Setting Up Command Line Interface Management â–  Setting Up Web Interface Management â–  Setting Up SNMP Management â–  Default Users and Passwords
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34 CHAPTER 3 : SETTING UP FOR MANAGEMENT Setting Up This section gives an overview of what you need to do to get your Switch Overview set up and ready for management when it is in its default state . The . Detailed procedural whole setup process is summarised in Figure 12 steps are contained in the sections that follow . In brief , you need to : â–  Configure IP information manually for your Switch or view the automatically configured IP information â–  Prepare for your chosen method of management Figure 12 Initial Switch Setup and Management Flow diagram Setup Power Up the Switch . Play and IP Information is automatically Plugconfigured . See page 35 Do you want to manually No Yes configure the IP information ? Setup How do you want to view the automatically How do you want to connect to the Switch ? Information configured IP information ? IP Connect to a front Connect to the console Use 3Com Network Connect to the console Initial panel port and use the port and use the Supervisor ( 3NS ) . port and use the Web Interface or Command Line See page 43 Command Line Command Line Interface . Interface . Interface . See page 37 See page 37 See page 44 How do you want to manage your Switch ? See page 46 Management SNMP Command Line Interface Web Interface See page 51 Feature Connect via the Connect over the Connect over the console port . network . network via Telnet . See page 48 See page 50 See page 48 CAUTION : To protect your Switch from unauthorized access , you must change all three default passwords as soon as possible , even if you do not intend to actively manage your Switch . For more information on default
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Setting Up Overview 35 users and changing default passwords , see “ Default Users and Passwords � on page 51 . IP Configuration You can use one of the following methods to allocate IP information to your Switch ( essential if you wish to manage your Switch across the network ) . Manual IP Configuration You can choose to configure the IP information yourself . The Switch remembers the information that you enter until you change it again or set the configuration method to Automatic . You should use the Manual IP configuration method if : ■ you do not have a DHCP or BootP server on your network , or ■ you want to remove the risk of the IP address ever changing , or ■ your DHCP or BootP server does not allow you to allocate static IP addresses . ( Static IP addresses are necessary to ensure that the Switch is always allocated the same IP information . ) For most installations , 3Com recommends that you configure the Switch IP information manually . This makes management simpler and more reliable as it is not dependent on a DHCP or BootP server , and eliminates the risk of the IP address changing . If you wish to manually enter IP information for your Switch , work section on page 37 . through the “ Manually Configuring IP Information � Automatic IP Configuration By default the Switch tries to configure itself with IP information without requesting user intervention . It tries to obtain an IP address from a DHCP or BootP server on the network . If neither server is found , the Switch will configure itself with its default IP address 169.254.100.100 if it is operating in a standalone mode , and / or no other Switches on the network have this IP address . If this default IP address is already in use on the network then the Switch detects this and configures itself with an IP address in the range 169.254.1.0 to 169.254.254.255 . This process is known as Auto - IP and is the same mechanism used by Windows 98 and Windows 2000 . IP addresses configured by Auto - IP are
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36 CHAPTER 3 : SETTING UP FOR MANAGEMENT temporary as they cannot be routed but are useful for small networks which are not connected to other networks , or for initial configuration . However , as soon as a DHCP or BootP server is detected , the Switch will configure itself with the IP address allocated by that server . When using automatic IP configuration it is important that the IP address of the Switch is static , otherwise you will not know what the IP address is and it will be difficult to manage . Most DHCP and BootP servers allow static IP addresses to be configured so that you know what IP address will be allocated to the Switch . Refer to the documentation that accompanies your DHCP / BootP server . For a detailed description of how automatic IP configuration operates , please refer to the Implementation Guide on the CD - ROM that accompanies your Switch or on the 3Com Web site . You should use the automatic IP configuration method if : ■ your network uses DHCP or BootP to allocate IP information , or ■ flexibility is needed . If the Switch is re - deployed onto a different subnet , it will automatically reconfigure itself with an appropriate IP address , instead of you having to manually reconfigure the Switch . If you use the automatic IP configuration method , you need to discover the automatically allocated IP information before you can begin management . Work through the “ Viewing Automatically Configured IP Information � section on page 43 . Preparing for Once your Switch’s initial set up is complete you can set up your chosen Management management method as described in “ Methods of Managing a Switch � 6 . on page 4 For detailed information about the specific web interface operations and command line interface commands and problem solving , refer to the “ Management Interface Reference Guide � on the CD - ROM that is supplied with the Switch or on the 3Com Web site .
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Manually Configuring IP Information 37 Manually You can manually configure the Switch IP information in the following Configuring IP ways : Information ■ Connecting to a front panel port — Connect a workstation using an Ethernet cable to a front panel port of the Switch . You can then manually enter IP information using the web interface or the command line interface ( CLI ) . ■ Connecting to the console port — Connect a workstation using a console cable to the console port of the Switch . You can then manually enter IP information using the command line interface ( CLI ) . Connecting to a Front To set up your Switch manually you can make a connection to a front Panel Port panel port . You must do this whilst the Switch is offline , that is , before you connect the Switch to a network . The procedure described in this section assumes the unit has been powered up in standalone mode and has the default IP address of 169.254.100.100 . Pre - requisites ■ A workstation running Windows 95 / 98 / 2000 or Windows NT . ■ A Network Interface Card ( NIC ) . ■ A Category 5 twisted pair Ethernet cable with RJ - 45 connectors . ■ A suitable Web browser — refer to “ Choosing a Browser � on page 49 . ■ You need to have the following so that you can manually set up the Switch with IP information : ■ IP address ■ subnet mask ■ default gateway
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38 CHAPTER 3 : SETTING UP FOR MANAGEMENT Connecting the Workstation to the Switch 1 Connect the workstation to a front panel port using an Ethernet cable as shown in Figure 13 . Figure 13 Connecting a workstation to the Switch via a front panel port To connect the cable : a Attach an RJ - 45 connector at one end of the Ethernet cable to the Network Interface Card ( NIC ) in the workstation . b Connect the RJ - 45 connector at the other end of the cable to one of the front panel ports on the Switch . Do not interconnect the Switch to any other unconfigured Switch . Configuring the Workstation with IP Information You need to change the IP address and subnet mask of the workstation that you have connected to the Switch . Make a note of the existing settings so you can return to them later . Change the workstation to the following settings : ■ IP address — 169.254.100.99 ■ Subnet mask — 255.255.0.0 Setting Up the Switch with IP Information You are now ready to manually set up the Switch with IP information . You can do this using the Web interface or the command line interface ( CLI ) via telnet . Using the Web Interface 1 Power - up the Switch . This takes approximately one minute . 2 Open a suitable Web browser and enter 169.254.100.100 in the Location Address field . This is the default IP address that is automatically assigned to an offline unit .
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Manually Configuring IP Information 39 If there is no response , wait for one minute then re - enter the default IP address . 3 At the login and password prompts , enter admin as your user name and press Return at the password prompt ( default user name and password ) . If you have logged on correctly , a set of Getting Started pages are displayed . 4 The Getting Started pages allow you to enter basic setup information for the Switch . Select Manual and then enter the IP address , subnet mask , and default gateway that you want the Switch to use when it is connected to the network . The final page displays a summary of the information entered . The initial set up of your Switch is now complete and the Switch is ready for you to set up your chosen management method . See “ Methods of Managing a Switch � on page 46 . Using Command Line Interface via Telnet 1 To start a Telnet session to the unit , click Start in Microsoft Windows 95 / 98 / 2000 / NT . a Click Run . b In the dialogue box that appears type the default IP address of the unit , that is : Telnet 169.254.100.100 c Click OK . 2 Press Enter to open a login prompt . If the login prompt does not begin immediately , press Return a few times until it starts . 3 At the login and password prompts , enter admin as your user name and press Return at the password prompt . If you have logged on correctly , the top - level menu of the command line interface is displayed as shown in 4 . the example in Figure 1
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40 CHAPTER 3 : SETTING UP FOR MANAGEMENT Figure 14 Example top - level command line interface menu 4 At the Select menu option prompt you can either : ■ enter the protocol ip basicConfig command . At the Enter configuration method prompt enter manual . The screen prompts you to enter IP information . or ■ enter the gettingStarted command . At the Enter configuration method prompt enter manual . The screen prompts you to enter IP information . 5 Enter the IP address , subnet mask , and gateway IP address for the Switch . The screen displays a summary of the information entered . If using the gettingStarted command you will then be prompted to enter system information , change passwords , and then given the option to carry out advanced configuration . The initial set up of your Switch is now complete and the Switch is ready for you to set up your chosen management method . See “ Methods of Managing a Switch � on page 46 . Connecting to the To set up your Switch manually you can alternatively make a connection Console Port to the console port ( this example describes a local connection to the console port , rather than a remote one via a modem ) . You can do this whilst the Switch is offline , that is , before you connect the Switch to a network , or whilst the Switch is online , that is , connected to a network . Pre - requisites ■ A workstation with terminal emulation software installed , such as Microsoft Hyperterminal . This software allows you to communicate with the Switch via the console port directly , or through a modem .
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Manually Configuring IP Information 41 ■ Documentation supplied with the terminal emulation software . ■ A suitable cable : ■ A standard null modem cable — if you are connecting directly to the console port , or ■ A standard modem cable — if you are connecting to the console port using a modem . on page 69 . You can find pin - out diagrams for both cables in Appendix B ■ You need to have the following so that you can manually set up the Switch with IP information : ■ IP address ■ subnet mask ■ default gateway Connecting the Workstation to the Switch 1 Connect the workstation to the console port using a standard null modem cable as shown in Figure 15 . Figure 15 Connecting a workstation to the Switch via the console port To connect the cable : a Attach the female connector on the cable to the male connector on the console port of the Switch . b Tighten the retaining screws on the cable to prevent it from being loosened . c Connect the other end of the cable to one of the serial ports ( also known as a COM port ) on your workstation . 2 Open your terminal emulation software and configure the COM port settings to which you have connected the cable . The settings should be set to match the default settings for the Switch , which are : ■ 19,200 baud ■ 8 data bits
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42 CHAPTER 3 : SETTING UP FOR MANAGEMENT â–  no parity â–  1 stop bit â–  no hardware flow control Refer to the documentation that accompanies the terminal emulation software for more information . Setting Up the Switch with IP Information You are now ready to manually set up the Switch with IP information using the command line interface . 1 The command line interface login sequence begins as soon as the Switch detects a connection to its console port . If the login prompt does not begin immediately , press Return a few times until it starts . 2 At the login and password prompts , enter admin as your user name and press Return at the password prompt . If you have logged on correctly , the top - level menu of the command line interface is displayed as shown in 6 . the example in Figure 1 Figure 16 Example top - level command line interface menu 3 At the Select menu option prompt you can either : â–  enter the protocol ip basicConfig command . At the Enter configuration method prompt enter manual . The screen prompts you to enter IP information . or â–  enter the gettingStarted command . At the Enter configuration method prompt enter manual . The screen prompts you to enter IP information .
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Viewing Automatically Configured IP Information 43 4 Enter the IP address , subnet mask , and gateway IP address for the Switch . The screen displays a summary of the information entered . If using the gettingStarted command you will then be prompted to enter system information , change passwords , and then given the option to carry out advanced configuration . The initial set up of your Switch is now complete and the Switch is ready for you to set up your chosen management method . See “ Methods of Managing a Switch � on page 46 . If you do not intend to use the command line interface via the console port to manage the Switch , you can logout , disconnect the serial cable and close the terminal emulator software . Viewing If you allow the Switch to automatically configure its own IP information Automatically you need to discover and view the IP information before you can begin to Configured IP manage the Switch . You can discover the IP information in two ways : Information ■ Using 3Com Network Supervisor — This application will auto - discover the Switch and display the automatically allocated IP information assigned to the Switch . ■ Connecting to the Console Port — Connect a workstation using a console cable to the console port of the Switch . You can then view the IP information automatically assigned to the Switch using the command line interface ( CLI ) . Using 3Com Network You can use the 3Com Network Supervisor application provided on the Supervisor CD - ROM that accompanies your Switch to discover the automatically allocated IP information . 1 Connect your Switch to the network . 2 Power - up the Switch and wait for two minutes . 3 Launch 3Com Network Supervisor and run the Auto - discovery wizard . 3Com Network Supervisor will auto - discover the new Switch and display the IP information that has been automatically allocated to the Switch . Most DHCP and BootP servers allow static IP addresses to be configured so that you know what IP address the Switch will be given . Refer to the documentation that accompanies your DHCP or BootP server .
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44 CHAPTER 3 : SETTING UP FOR MANAGEMENT If your network does not have a DHCP or BootP server , the workstation running 3Com Network Supervisor must be on the same subnet as the Switch , because Auto - IP addresses are non - routable . Connecting to the Alternatively , you can view the automatically configured IP information Console Port via the command line interface ( CLI ) through a connection to the console port . ( This example describes a local connection to the console port , rather than a remote one via a modem . ) Pre - requisites ■ A workstation with terminal emulation software installed , such as Microsoft Hyperterminal . This software allows you to communicate with the Switch via the console port directly , or through a modem . ■ Documentation supplied with the terminal emulation software . ■ A suitable cable : ■ A standard null modem cable — if you are connecting directly to the console port , or ■ A standard modem cable — if you are connecting to the console port using a modem . on page 69 . You can find pin - out diagrams for both cables in Appendix B ■ A Category 5 twisted pair Ethernet cable with RJ - 45 connectors to connect your Switch to the network . Connecting the Workstation to the Switch 1 Connect the workstation to the console port using a standard null 7 . modem cable as shown in Figure 1 Figure 17 Connecting a workstation to the Switch via the console port To connect the cable : a Attach the female connector on the cable to the male connector on the console port of the Switch .
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Viewing Automatically Configured IP Information 45 b Tighten the retaining screws on the cable to prevent it from being loosened . c Connect the other end of the cable to one of the serial ports ( also known as a COM port ) on your workstation . 2 Open your terminal emulation software and configure the COM port settings to which you have connected the cable . The settings should be set to match the default settings for the Switch , which are : â–  19,200 baud â–  8 data bits â–  no parity â–  1 stop bit â–  no hardware flow control Refer to the documentation that accompanies the terminal emulation software for more information . Viewing IP Information via the Console Port You are now ready to view the automatically allocated IP information using the command line interface . 1 Connect your Switch to the network using an Ethernet cable . As soon as a network connection is made the Switch begins the automatic IP configuration process . The automatic IP configuration process usually completes within one minute . If there is no response from a DHCP server within 30 seconds , the Auto - IP configuration mechanism attempts to allocate the default IP address 169.254.100.100 . If this address is not available , it then allocates an IP address in the range of 169.254 . x.y ( where x is in the range 1 to 254 , and y is in the range 0 to 255 ) . 2 The command line interface login sequence begins as soon as the Switch detects a connection to its console port . If the login prompt does not begin immediately , press Return a few times until it starts . 3 At the login and password prompts , enter admin as your user name and press Return at the password prompt . If you have logged on correctly , the top - level menu of the command line interface is displayed as shown in 8 . the example in Figure 1
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46 CHAPTER 3 : SETTING UP FOR MANAGEMENT Figure 18 Example top - level command line interface menu 4 At the Select menu option prompt enter the protocol ip interface summary command . At the Select IP interfaces prompt enter all . A summary of the automatically allocated IP information is displayed . Make a note of the Network IP Address . The initial set up of your Switch is now complete and the Switch is ready for you to set up your chosen management method . See “ Methods of Managing a Switch � on page 46 . If you do not intend to use the command line interface via the console port to manage the Switch , you can disconnect the serial cable and close the terminal emulator software . Methods of Once you have completed the initial set up of your Switch , you can Managing a Switch decide how you wish to manage the Switch . You can use one of the following methods : ■ Command line interface management ■ Web interface management ■ SNMP management Command Line Each Switch has a command line interface ( CLI ) that allows you to Interface manage the Switch from a workstation , either locally via a console port ) , or remotely over the network ( see Figure 20 ) . Management connection ( see Figure 19
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Methods of Managing a Switch 47 Figure 19 CLI management via the console port Figure 20 CLI management over the network Refer to “ Setting Up Command Line Interface Management � on 8 . page 4 Web Interface Each Switch has an internal set of web pages that allow you to manage Management the Switch using a Web browser remotely over an IP network ( see ) . Figure 21 Figure 21 Web interface management over the network Refer to “ Setting Up Web Interface Management � on page 49 . SNMP Management You can manage a Switch using any network management workstation running the Simple Network Management Protocol ( SNMP ) as shown in . For example , you can use the 3Com Network Supervisor Figure 22 software that is provided on the CD - ROM that accompanies your Switch .
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48 CHAPTER 3 : SETTING UP FOR MANAGEMENT Figure 22 SNMP management over the network Refer to “ Setting Up SNMP Management � on page 51 . Setting Up This section describes how you can set up command line interface Command Line management using a local console port connection or over the network . Interface Management CLI Management via To manage a Switch using the command line interface via the local the Console Port console port connection : 1 Ensure you have connected your workstation to the console port correctly on page 40 . as described in “ Connecting to the Console Port � 2 Your Switch is now ready to continue being managed and / or configured through the CLI via its console port . CLI Management over To manage a Switch using the command line interface over a network the Network using Telnet : 1 Ensure you have already set up the Switch with IP information as on page 34 . described in “ Setting Up Overview � 2 Check that you have the IP protocol correctly installed on your management workstation . You can check this by trying to browse the World Wide Web . If you can browse , the IP protocol is installed . 3 Check you can communicate with the Switch by entering a ping command at the DOS prompt in the following format : c : \ ping xxx.xxx.xxx.xxx ( where xxx.xxx.xxx.xxx is the IP address of the Switch ) If you get an error message , check that your IP information has been entered correctly and the Switch is powered up . 4 To open a Telnet session via the DOS prompt , enter the IP address of the Switch that you wish to manage in the following format :
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Setting Up Web Interface Management 49 > telnet xxx.xxx.xxx.xxx ( where xxx.xxx.xxx.xxx is the IP address of the Switch ) If opening a Telnet session via third party software you will need to enter the IP address in the format suitable for that software . 5 At the login and password prompts , enter admin as your user name and press Return at the password prompt ( or the password of your choice if you have already modified the default passwords ) . If the login prompt does not display immediately , press Return a few times until it starts . 6 If you have logged on correctly , the top - level menu of the command line interface for the Switch you wish to manage is displayed as shown in on page 42 . Figure 16 Setting Up Web This section describes how you can set up web interface management Interface over the network . Management ■ Ensure you have already set up the Switch with IP information as Pre - requisites on page 34 . described in “ Setting Up Overview � ■ Ensure that the Switch is connected to the network using a Category 5 twisted pair Ethernet cable with RJ - 45 connectors . ■ A suitable Web browser . Choosing a Browser To display the web interface correctly , use one of the following Web browser and platform combinations : Table 8 Supported Web Browsers and Platforms Windows NT Windows Solaris 4 2000 2.6 Windows 95 Windows 98 Windows XP Netscape 4.76 ✓ ✓ ✓ ✓ ✓ ✓ Netscape 6.2 ✕ ✓ ✓ ✓ ✓ ✕ Internet Explorer ✓ ✓ ✓ ✓ ✓ ✕ 5.0 , 5.5 and 6.0
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50 CHAPTER 3 : SETTING UP FOR MANAGEMENT For the browser to operate the web interface correctly , JavaScript and Cascading Style Sheets must be enabled on your browser . These features are enabled on a browser by default . You will only need to enable them if you have changed your browser settings . To enable style sheets in Netscape Navigator 4.76 on Solaris 2.6 , open Netscape Navigator and select Edit > Preferences > Fonts . Select the Use document - specified fonts , including Dynamic Fonts radio button . You should also set the font sizes as follows : â–  Variable Width Font - Size 10.0 â–  Fixed Width Font - Size 12.0 This ensures that the text spacing is correct . Finally in the Advanced category ensure that Enable JavaScript and Enable style sheets are checked . Web Management To manage a Switch using the web interface over an IP network : Over the Network 1 Check that you have the IP protocol correctly installed on your management workstation . You can check this by trying to browse the World Wide Web . If you can browse , the IP protocol is installed . 2 Check you can communicate with the Switch by entering a ping command at the DOS prompt in the following format : c : \ ping xxx.xxx.xxx.xxx ( where xxx.xxx.xxx.xxx is the IP address of the Switch ) If you get an error message , check that your IP information has been entered correctly and the Switch is powered up . 3 Open your web browser and enter the IP address of the Switch that you wish to manage in the URL locator , for example , in the following format : http : / / xxx.xxx.xxx.xxx 4 At the login and password prompts , enter admin as your user name and press Return at the password prompt ( or the password of your choice if you have already modified the default passwords ) . 5 Click on the Device View button to display the web management options .
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Setting Up SNMP Management 51 Setting Up SNMP Any network management application running the Simple Network Management Management Protocol ( SNMP ) can manage a Switch if : ■ The correct Management Information Bases ( MIBs ) are installed on the management workstation . ■ The management workstation is connected to the Switch using a port in VLAN 1 ( the Default VLAN ) . By default , all ports on the Switch are in VLAN 1 . You can use the 3Com Network Supervisor application that is provided on the CD - ROM that accompanies your Switch to provide SNMP management for your Switch . If you use 3Com Network Supervisor it automatically loads the correct MIBs and necessary files onto your workstation . ■ Documentation supplied with the SNMP network management Pre - requisites application software . To manage your Switch using an SNMP network management application , you need to specify SNMP community strings for the users defined on the Switch . You can do this using the command line interface system management snmp community command — refer to the command line interface section of the “ Management Interface Reference Guide � for more information . Default Users and If you intend to manage the Switch using the web interface or the Passwords command line interface , or to change the default passwords , you need to log in with a valid user name and password . The Switch has three default user names , and each user name has a different password and level of 9 . access . These default users are listed in Table CAUTION : To protect your Switch from unauthorized access , you must change all three default passwords as soon as possible , even if you do not intend to actively manage your Switch
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52 CHAPTER 3 : SETTING UP FOR MANAGEMENT Table 9 Default Users User Default Name Password Access Level monitor monitor monitor — the user can view all manageable parameters , except special / security features , but cannot change any manageable parameters . manager manager manager — the user can access and change the operational parameters but not special / security features admin ( no security — the user can access and change all manageable password ) parameters Use the admin default user name ( no password ) to login and carry out initial Switch setup . Changing Default You can change the default passwords using either : Passwords ■ The gettingStarted command on the CLI , or ■ The security device user modify command on the CLI , or ■ The Security > Device > User > Modify operation on the web interface . For more information about default users and passwords , refer to the “ Management Interface Reference Guide � on the Switch CD - ROM .
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PROBLEM SOLVING 4 This chapter helps you to diagnose and solve problems you may have with the operation of your Switch . There is also an explanation of IP addressing . The topics covered are : â–  Solving Problems Indicated by LEDs â–  Solving Hardware Problems â–  Solving Communication Problems â–  Solving Software Upgrade Problems If you experience a problem that is not listed here , it may be included in the support section of the Superstack 3 Switch Management Interface Reference Guide on the CD - ROM that accompanies your Switch . To ensure this product provides optimum performance , high speed fans are used to provide ventilation . These fans have a high audible output . D . For Technical Support information , see Appendix
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54 CHAPTER 4 : PROBLEM SOLVING Solving Problems If the LEDs on the Switch indicate a problem , refer to the list of suggested Indicated by LEDs solutions below . The Power LED does not light Check that the power cable is firmly connected to the Switch and to the supply outlet . If the connection is secure and there is still no power , you may have a faulty power cord or an internal fault . Firstly , check the power cord by : ■ testing it in another device ■ connecting a working power cord to the ‘ problem ’ device then contact your supplier for advice . On powering - up , the Power / Self Test LED lights yellow The Switch unit has failed its Power On Self Test ( POST ) because of an internal problem . The fault type will be indicated on the unit LEDs . Contact your supplier for advice . A link is connected and yet the Status LED for the port does not light Check that : ■ The Switch and the device at the other end of the link ( or cable ) are connected securely . ■ The devices at both ends of the link are powered - up ■ The quality of cable is satisfactory ■ Auto - negotiation settings are the same at both ends . Auto - negotiation problems will occur with 10BASE - T or 100BASE - T where auto - negotiation is disabled and incorrect cables are being used ( cross - over or straight ) Auto - negotiation problems will occur with fiber if : ■ The Receiver ( RX ) and Transceiver ( TX ) cable connectors are swapped ■ Fibers are broken ■ Auto - negotiation differs at either end ( a link appears at the ‘ fixed ’ end and not at the auto - negotiation end )
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Solving Hardware Problems 55 Solving Hardware In the rare event of your Switch unit experiencing a hardware failure , Problems refer to the list of suggested solutions below . An expansion module is installed and the unit will not power up Ensure that the expansion module is fully seated in the slot and the connectors are engaged so that the securing screws can be tightened . A fan failure warning message is received Your Switch has a fan monitoring system that will generate fan failure warning messages . Fan failure could potentially reduce the lifetime of the Switch . The monitoring system polls the fan status at periodic intervals while the unit is powered up . Should one fan failure occur in the Switch , a warning message will be generated in the following ways : ■ RMON Email Notification — If configured , you will receive notification of the fan failure via email , SMS ( Short Message Service ) , or pager . ■ RMON Trap — If configured , an RMON trap is generated and sent to the management workstation . For further information about RMON , refer to “ Chapter 7 : Status Monitoring and Statistics � in the Switch Implementation Guide supplied in PDF format on the CD - ROM that accompanies the Switch . If more than one fan fails in the Switch , a warning message will be generated by RMON Email Notification , RMON Trap and also in the following ways : ■ Command Line Interface — An indication of a general hardware failure is provided through the Top level menu displayed when logging on to the CLI . For more detailed information about the failure select the system summary command . ■ Web interface — An indication of fan failure is provided through the Device Summary table for the specific unit . In addition all Summary tables turn red to indicate the fan failure .
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56 CHAPTER 4 : PROBLEM SOLVING If a fan failure warning message is generated : 1 Power off the unit . 2 Check that the air vents are not obstructed . 3 Power cycle the unit . To do this , remove and reconnect the AC mains supply . If the unit has no AC main supply , remove and reconnect the DC RPS supply . 4 If another fan failure warning message is generated via the Command Line Interface or the Web interface , return the unit . Unit fails , no SNMP fan failure message is received 1 Power cycle the unit . To do this , remove and reconnect the AC mains supply . If the unit has no AC mains supply , remove and reconnect the DC RPS supply . 2 Check the command line interface ( system summary command ) to determine whether a thermal shutdown has occurred . 3 If no , return the unit : If yes , check that : ■ The air vents are not obstructed . ■ The ambient temperatures and environmental conditions meet those C . specified in Appendix 4 Power cycle the unit . If a further thermal shutdown occurs , and all environmental conditions are satisfactory , return the unit to 3Com . Error message indicating that the GBIC transceiver is invalid The Switch has identified that the GBIC does not meet the minimum requirements for the Switch and has disabled the port . To correct this problem , completely remove the GBIC and replace it with a 3Com on page 29 . approved GBIC . See “ Approved GBIC Transceivers � Error message indicating that the GBIC transceiver is faulty To correct this problem , completely remove the GBIC and then reinsert it . If the problem persists , contact 3Com Technical Support .
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Solving Communication Problems 57 Solving If you experience communication problems with the Switch , ensure that : Communication ■ The Switch IP address has been configured . Problems ■ If the Switch is separated from your management application by a router , ensure that the default gateway IP address within the Switch is the same as the IP address of the router . ■ The Switch’s IP address has been entered correctly in your network management application ( for example 3Com Network Supervisor ) . The following is an brief overview of IP addressing , and how to obtain a registered IP address . IP Addressing To be managed correctly , each device on your network ( for example a Switch or Hub ) must have a unique IP address . IP addresses have the format n.n.n.n where n is a decimal number between 0 and 255 . An example IP address is 192.168.100.8 . The IP address is split into two parts : ■ The first part ( ‘ 192.168.100 ’ in the example ) identifies the network on which the device resides ■ The second part ( ‘ . 8 ’ in the example ) identifies the device within the network The natural subnet mask for this example is 255.255.255.0 . If your network has a connection to the external IP network , that is , you access the Internet , you must apply for a registered IP address . How do you obtain a registered IP Address ? The IP registration system ensures that every IP address used is unique ; if you do not have a registered IP address , you may be using an identical address to someone else and your network will not operate correctly . InterNIC Registration Services is the organization responsible for supplying registered IP addresses . The following contact information is correct at time of publication : World Wide Web site : http : / / www.internic.net
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58 CHAPTER 4 : PROBLEM SOLVING If your IP network is internal to your organization only , that is , you do not access the Internet , you may use any arbitrary IP address as long as it is not being used by another device on your network . 3Com suggests you use addresses in the range 192.168.0.0 to 192.168.255.255 with a subnet mask of 255.255.255.0 . These suggested IP addresses are part of a group of IP addresses that have been set aside specially for use ‘ in house ’ only . Solving Software You can upgrade the management software of the Switch by using the Upgrade Problems System > Control > Software Upgrade operation in the Web Interface , or the system control softwareUpgrade command in the command line interface . For details on these options , refer to the Management Interface Reference Guide supplied in HTML format on the CD - ROM that accompanies your Switch . If you have problems with your software upgrade , refer to the Problem Solving section in the Management Interface Reference Guide .
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SAFETY INFORMATION A You must read the following safety information before carrying out any installation or removal of components , or any maintenance procedures on the Switch 4900 , 4900 SX , 4924 , or 4950 . WARNING : Warnings contain directions that you must follow for your personal safety . Follow all directions carefully . You must read the following safety information carefully before you install or remove the unit . AVERTISSEMENT : Les avertissements présentent des consignes que vous devez respecter pour garantir votre sécurité personnelle . Vous devez respecter attentivement toutes les consignes . Nous vous demandons de lire attentivement les consignes suivantes de sécurité avant d’installer ou de retirer l’appareil . VORSICHT : Vorsicht enthalten Anweisungen , die Sie zu Ihrer eigenen Sicherheit befolgen müssen . Alle Anweisungen sind sorgfältig zu befolgen . Sie müssen die folgenden Sicherheitsinformationen ’ sorgfältig durchlesen , bevor Sie das Gerät installieren oder ausbauen . Power Cord Set — Japan
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60 APPENDIX A : SAFETY INFORMATION Important Safety Information WARNING : Installation and removal of the unit must be carried out by qualified personnel only . WARNING : If installing the Switch in a stack with SuperStack 3 units that are narrower than the Switch , the Switch unit must be installed below the narrower units . WARNING : The unit must be earthed ( grounded ) . WARNING : Connect the unit to an earthed power supply to ensure compliance with safety standards . WARNING : Power Cord Set : This must be approved for the country where it is used : U.S.A . and ■ The cord set must be UL - approved and CSA certified . Canada ■ The minimum specification for the flexible cord is : No . 18 AWG Type SV or SJ 3 - conductor ■ The cord set must have a rated current capacity of at least 10A . ■ The attachment plug must be an earth - grounding type with a NEMA 5 - 15P ( 15A , 125V ) or NEMA 6 - 15P ( 15A , 250V ) configuration . United ■ The supply plug must comply with BS1363 ( 3 - pin 13 amp ) Kingdom only and be fitted with a 5A fuse which complies with BS1362 . ■ The mains cord must be < HAR > or < BASEC > marked and be of type H03VVF3GO . 75 ( minimum ) . Europe only : ■ The supply plug must comply with CEE 7 / 7 ( “ SCHUKO � ) . ■ The mains cord must be < HAR > or < BASEC > marked and be of type H03VVF3GO . 75 ( minimum ) . Denmark ■ The supply plug must comply with section 107 - 2 - D1 , standard DK2 - 1a or DK2 - 5a . Switzerland ■ The supply plug must comply with SEV / ASE 1011 . WARNING : 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 .
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Important Safety Information 61 WARNING : 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 . WARNING : This unit operates under SELV ( Safety Extra Low Voltage ) conditions according to IEC 60950 . The conditions are only maintained if the equipment to which it is connected also operates under SELV conditions . WARNING : France and Peru only : † supplies . If your supplies are of IT This unit cannot be powered from IT type , this unit must be powered by 230V ( 2P + T ) via an isolation transformer ratio 1 : 1 , with the secondary connection point labelled Neutral , connected directly to earth ( ground ) . † Impédance à la terre . WARNING : U.K . only : If connecting a modem to the console port of the Switch , only use a modem which is suitable for connection to the telecommunications system . WARNING : RJ - 45 Ports . These are shielded RJ - 45 data sockets . They cannot be used as standard traditional 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 connected to these data sockets . WARNING : The switch should only be used in a rack if it is mounted on runners , a shelf , or a tray to support the weight . The rack mount kits alone are not sufficient to support the weight of the switch . The rack mount kits must not be used to suspend the switch from under a table or desk , or attach it to a wall . WARNING : If you are connecting the Switch to a Type 3 Power Module , read the Safety Information section in the Type 3 Power Module User Guide . WARNING : When an Expansion Module is not installed ensure the blanking panel is fited by tightening all screws with a suitable tool .
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