3com 3C17706 Getting Started Manual

http://www.3com.com/

Part No. DUA1770-6AAA03

Published October 2001

SuperStack

®

3

Switch 4950

Getting Started Guide

3C17706

3Com Corporation

5400 Bayfront Plaza

Santa Clara, California

95052-8145

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 Technologies.

3Com Technologies reserves the right to revise this documentation and to make changes in content from time

to time without obligation on the part of 3Com Technologies to provide notification of such revision or

change.

3Com Technologies 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 and SuperStack are registered trademarks of 3Com Corporation. The 3Com logo and CoreBuilder are

trademarks of 3Com Corporation.

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

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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.

CONTENTS

A

BOUT

T

HIS

G

UIDE

Conventions 8

Related Documentation 9

Accessing Online Documentation 9

Product Registration 10

Documentation Comments 10

1

I

NTRODUCING

THE

S

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3 S

WITCH

4950

About the Switch 4950 12

Summary of Hardware Features 12

Summary of Software Features 13

Switch 4950 — Front View Detail 13

10/100/1000BASE-T Ports 14

1000BASE-SX Ports 14

GBIC Ports 14

LEDs 15

Switch 4950 — Rear View Detail 16

Unit Information Label 16

Power Socket 16

Redundant Power System Socket 16

Console Port 17

Expansion Module Slot 17

Default Settings 17

2

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Package Contents 20

Choosing a Suitable Site 20

Rack-mounting 21

Placing Units On Top of Each Other 22

The Power-up Sequence 23

Powering-up the Switch 4950 23

Checking for Correct Operation of LEDs 23

Connecting a Redundant Power System 23

Choosing the Correct 10/100/1000BASE-T Cables 24

Choosing the correct Fiber cables 25

GBIC Operation 25

Approved GBIC Transceivers 25

Inserting a GBIC Transceiver 26

3

S

ETTING

U

P

FOR

M

ANAGEMENT

Logging in as a Default User 30

Changing Default Passwords 30

Introduction to Setting Up 31

Initial Switch Setup 31

Pre-requisites 31

Connecting to the Console Port 32

Setting up IP Information via the Console Port 33

Methods of Managing a Switch 34

Command Line Interface Management 34

Web Interface Management 35

SNMP Management 35

Setting Up Command Line Interface Management 36

CLI Management via the Console Port 36

CLI Management over the Network 36

Setting Up Web Interface Management 37

Pre-requisites 37

Web Management Over the Network 37

Setting Up SNMP Management 38

Pre-requisites 38

4

P

ROBLEM

S

OLVING

Solving Problems Indicated by LEDs 40

Solving Hardware Problems 41

Solving Communication Problems 42

A

S

AFETY

I

NFORMATION

Important Safety Information 46

L’information de Sécurité Importante 49

Wichtige Sicherheitsinformationen 52

B

P

IN

-

OUTS

Null Modem Cable 55

PC-AT Serial Cable 55

Modem Cable 56

RJ-45 Pin Assignments 56

C

T

ECHNICAL

S

PECIFICATIONS

D

T

ECHNICAL

S

UPPORT

Online Technical Services 61

World Wide Web Site 61

3Com Knowledgebase Web Services 61

3Com FTP Site 62

Support from Your Network Supplier 62

Support from 3Com 62

Returning Products for Repair 64

I

NDEX

R

EGULATORY

N

OTICES

ABOUT THIS GUIDE

This guide provides all the information you need to install and use a

SuperStack

®

3 Switch 4950 in its default state.

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).

Please refer to the CD-ROM that accompanies your Switch for the

following:

■

Management Interface Reference Guide - an online guide which gives

you detailed information on how to use the web interface and

command line interface to manage the Switch.

■

3Com Network Supervisor - a powerful network management tool for

small to medium enterprise networks.

■

A number of other useful applications.

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/

8 A

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Conventions

Ta b le 1 and Tab l e 2 list conventions that are used throughout this guide.

Ta b l e 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.

Ta b l e 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”

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.”

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

.

Related Documentation

9

In addition to this guide, each Switch documentation set includes the

following:

■

SuperStack 3 Switch Implementation Guide

This guide contains information on the features supported by your

Switch and how they can be used to optimize your network.

■

SuperStack 3 Management Quick Reference Guide

This guide contains a summary of the web interface and command

line interface commands for the Switch.

■

Release Notes

These notes provide information about the current software release,

including new features, modifications, and known problems.

■

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:

■

Documentation accompanying the Advanced Redundant Power

System.

■

Documentation accompanying the Expansion Modules.

■

Documentation accompanying 3Com Network Supervisor. This is

supplied on the CD-ROM that accompanies the Switch.

Accessing Online

Documentation

The CD-ROM supplied with your Switch contains the following online

documentation:

■

SuperStack 3 Switch Implementation Guide (PDF format)

■

SuperStack 3 Switch Management Interface Reference Guide (HTML

format).

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.

10 A

BOUT

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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.

■

The HTML Reference Guide is stored in the Docs/referenceguide

on the CD-ROM. The documentation is accessed using the index.htm

file.

■

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.

Product

Registration

You can register your SuperStack 3 Switch on the 3Com Web site to

receive up-to-date information on your product:

http://support.3com.com/registration/frontpg.pl

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 commenting:

■

Document title

■

Document part number (on the title page)

■

Page number (if appropriate)

Example:

Part Number DUA1770-6AAA01

SuperStack 3 Switch 4950 Getting Started Guide

Page 21

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4950

This chapter contains introductory information about the SuperStack

®

3

Switch 4950 and how it can be used in your network. It covers summaries

of hardware and software features and also the following topics:

■

About the Switch 4950

■

Switch 4950 — Front View Detail

■

Switch 4950 — Rear View Detail

■

Default Settings

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About the Switch

4950

The Switch 4950 is a 10/100/1000 Mbps mixed media device which

consists of:

■

12 10/100/1000BASE-T ports

■

6 1000BASE-SX ports

■

6 Gigabit Interface Convertor (GBIC) ports

Summary of

Hardware Features

Ta b le 3

summarizes the hardware features that are supported by the

Switch 4950.

Ta b l e 3 Hardware features

Feature Switch 4950

Addresses

Up to 12,000 supported

Up to 64 permanent entries

Forwarding Modes

Store and Forward

Duplex Modes

■

Half duplex only supported on 10/100/1000 Mbps

ports in 10/100 Mbps mode

■

All 1000 Mbps ports are full duplex only

Flow Control

Supported on all ports

Smart auto-sensing

Supported on 10/100/1000BASE-T ports only

Traffic Prioritization

Supported (IEEE 802.1D — incorporating 802.1P)

Four traffic queues per port

Fast Ethernet and

Gigabit Ethernet Ports

Auto-negotiating 10/100/1000BASE-T, 1000BASE-SX

and GBIC ports

RPS Support

Connects to SuperStack 3 Advanced Redundant Power

System (ARPS) (3C16071B)

Mounting

19-inch rack or stand-alone mounting

Switch 4950 — Front View Detail

13

Summary of Software

Features

Ta b le 4

summarizes the software features that are supported by the

Switch 4950.

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.

Ta b l e 4 Software features

Switch 4950 —

Front View Detail

Figure 1 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.

Feature Switch 4950

Resilient Links

Supported

Aggregated Links

Support for four groups of four ports per unit

Broadcast Storm Control

Supported

Virtual LANs (VLANs)

Support for up to 30 VLANs using the IEEE 802.1Q

standard

Multicast Filtering

■

128 Multicast filter groups supported

■

IGMP filtering supported

Spanning Tree Protocol

Supported

RMON

Seven groups supported: Statistics, History, Alarms,

Hosts, Hosts Top N, Matrix, Events

Management

Web interface, command line interface, and SNMP

supported

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10/100/1000BASE-T

Ports

The 12 10/100/1000BASE-T ports have RJ-45 connectors and are

configured as Auto MDIX (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 or 100 Mbps half duplex and 10 Mbps

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.

1000BASE-SX Ports The 6 auto-negotiating 1000BASE-SX ports have MT-RJ connectors.

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.

GBIC Ports The 6 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.

Switch 4950 — Front View Detail

15

LEDs Ta b le 5

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

solving, see “Checking for Correct Operation of LEDs”

on page 23.

Ta b l e 5 LED behavior

LED Color Indicates

Port Status 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 (10/100 Mbps) link is present, and the

port is enabled.

Yellow flashing A low speed (10/100 Mbps) link is present, but the port

is disabled.

Off No link is present.

Module Status LEDs

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 4950 unit will continue to operate normally.

Off The Module is not installed.

Unit LEDs

1–4 Green When the Switch can form a stack with other Switch

4950 units the LED indicates the position of the unit in

the stack and that a link is present.

Off The Switch is stand-alone or the link is not present.

Power/Self Test LED

Green The Switch is powered-up and operating normally.

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.

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Switch 4950 — Rear

View Detail

Figure 2 Switch 4950 — rear view

Unit Information

Label

This label shows the following:

■

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

System Socket

To protect against internal power supply failure, you can use this socket

to connect a SuperStack 3 Advanced Redundant Power System (RPS) to

the Switch. If there is evidence of a problem, see “Connecting a

Redundant Power System” on page 23.

Layer-3 LED

Green Indicates that Layer 3 is enabled on the Switch.

Off Indicates that Layer 3 is disabled on the Switch.

LED Color Indicates

Default Settings

17

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 19,200 kbps, 8 data bits, no parity and 1 stop

bit.

Expansion Module

Slot

You can use this slot to install an Expansion Module. Contact your

supplier for further information.

WARNING:

When an Expansion Module is not installed, ensure the

blanking plate is fitted by tightening all screws with a suitable tool.

Default Settings

Ta b le 6 shows the default settings for the Switch 4950. If you initialize

one of the Switch units, it is returned to these defaults.

Ta b l e 6 Default Settings

Feature Switch 4950

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

Spanning Tree Protocol

Disabled

Smart Auto-sensing

Enabled

IP Address

0.0.0.0

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2

INSTALLING THE SWITCH

This chapter contains the information you need to install and set up the

Switch 4950. It covers the following topics:

■

Package Contents

■

Choosing a Suitable Site

■

Rack-mounting

■

Placing Units On Top of Each Other

■

The Power-up Sequence

■

GBIC Operation

WARNING: Safety Information. Before installing or removing any

components from the Switch 4950 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 4950 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 4950 entfernen oder dem Switch 4950 hinzufuegen oder

Instandhaltungsarbeiten verrichten, lesen Sie die

Sicherheitsanweisungen, die in Anhang A in diesem Handbuch

aufgefuehrt sind.

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Package Contents

■

Switch 4950 (3C17706)

■

CD-ROM

■

This Guide

■

Implementation 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

Site

The Switch is suited for use in an internal wiring closet, a network room,

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 temperature 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 flow around the Switch does not exceed 40 °C (104

°

F).

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