3Com 1100 User Manual

Download

SuperStack® II Switch

Management Guide

For units in the SuperStack II Switch 1100/3300 and 610/630 Family Management Software Version 2.50

http://www.3com.com/

Part No. DUA1695-0BAA04 Published May 2000

3Com Corporation 5400 Bayfront Plaza Santa Clara, California 95052-8145

Copyright © 2000, 3Com Technologies. All rights reserved. No part of this documentation may be reproduced in any form or by any means or used to make any derivative work (such as translation, transformation, or adaptation) without written permission from 3Com 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.

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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, Net Age, SmartAgent, SuperStack and Transcend are registered trademarks of 3Com Corporation. CoreBuilder and PACE are trademarks of 3Com Corporation. 3ComFacts is a service mark of 3Com Corporation.

All other company and product names may be trademarks of the respective companies with which they are associated.

ENVIRONMENTAL STATEMENTS

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.

ONTENTS

BOUT THIS GUIDE

Conventions 13 Related Documentation 15 Year 2000 Compliance 15 Documentation Comments 16 Product Registration 16

I Getting Started with Management

UPERSTACK

What is Management Software? 20 Summary of Software Features 20 Software Features Explained 21

Stack Management 21 Forwarding Modes 21 Duplex Modes 22 Flow Control 23 Traffic Prioritization 23 PACE 24 Security 24 Resilient Links 25 Port Trunks 25 Broadcast Storm Control 26 Virtual LANs 26 FastIP 26 Multicast Filtering 27 Spanning Tree Protocol 27 RMON 27 Roving Analysis 28 Management 28

Default Settings 29

WITCH MANAGEMENT SOFTWARE

II S

ETTING UP FOR MANAGEMENT

Methods of Managing a Switch 32 Setting Up Web Interface Management 33

Setting Up Through the Console Port 33 Setting Up Over the Network 34 Installing Online Help and Documentation 34 Choosing a Browser 35 Configuring the Browser 35

Setting Up Command Line Interface Management 36

Setting Up Through the Console Port 36

Setting Up Over the Network 37 Setting Up SNMP Management 37 Managing a Switch Over the Network 38

IP Addresses 38

Obtaining a Registered IP Address 38

Subnets and Using a Subnet Mask 39 Logging in as a Default User 39

II The Management Interfaces

ORKING WITH THE WEB INTERFACE

Accessing the Web Interface 44

Exiting the Web Interface 45 The Getting Started Pages 46 The Main Web Interface 48

The External Link Icons 49

The Management Icons 50

The Page Area 50

Navigating the Page Area 52 Making Changes in the Page Area 53

Configuring the Current Switch 54

Displaying the Status of the Ports 54

Displaying the Color Codes Used by the Switch Graphic 54 Displaying the Speed and Duplex Mode of Ports 55 Refreshing the Switch Graphic 55

Displaying Administration Details 56

Setting Up IP Information 58 Configuring a Port 59 Configuring the Console Port 66

Changing the Management Settings for the Stack 67

Specifying a Descriptive Name 67 Changing Your Password 68 Specifying a Physical Location 69 Accessing the Getting Started Pages 69 Specifying the Location of the Online Help and Documentation 70 Specifying Contact Details 71

Configuring the Stack 71

Configuring the Switch Database 72

What is the Switch Database? 72 Displaying the Switch Database 73 Inserting Permanent Entries 74

Deleting Entries 75 Configuring the Advanced Stack Settings 76 Setting Up Resilient Links 79

What are Resilient Links? 79

Displaying Resilient Link Pairs 80

Creating a Resilient Link Pair 80

Deleting a Resilient Link Pair 81

Swapping the Active Port of a Resilient Link Pair 81 Setting Up Port Trunks 81

What are Port Trunks? 82

Displaying the Ports that Belong to Each Port Trunk 82

Placing Ports in a Port Trunk 82 Configuring VLANs 83

What are VLANs? 84

Defining VLAN Information 84

Editing VLAN Information 84

Deleting VLAN Information 85

Displaying the Ports that Belong to Each VLAN 85

Placing Ports in Single VLANs 85

Placing Ports in Multiple VLANs Using VLT Tagging 85

Placing Ports in Multiple VLANs Using 802.1Q Tagging 85 Setting Up Roving Analysis Ports 86

What is Roving Analysis? 87

Defining Monitor Ports and Analysis Ports 87 Enabling the Roving Analysis System 88

Resetting All the Units in the Stack 88

What Happens During a Reset? 88

Initializing All the Units in the Stack 88

What Happens During an Initialization? 88

Upgrading Management Software 89

Displaying Statistics for the Current Switch 91

Displaying Unit Statistics 91

Interpreting the Statistics 92

Displaying Port Statistics 92

Interpreting the Statistics 94

ORKING WITH THE COMMAND LINE INTERFACE

Accessing the Interface 96

Exiting the Interface 96 How Many Users Can Access the Interface? 97

About the Interface Menus 97

Entering Commands 99 Displaying Menus 100

Obtaining Help 100 A Quick Guide to the Commands 101 Displaying and Changing Bridging/VLANs Information 105

Setting the Bridge Address Aging Time 105

Displaying Bridge Information 105

Enabling and Disabling IGMP Snooping 107

Enabling and Disabling Router Port Auto-Discovery 108

Manually Identifying a Router Port 108

Displaying all Router Ports 108

Removing a Router Port 109

Adding a Statically Configured Address to a Switch Database 110

Finding a MAC Address 110

Displaying MAC Addresses for a Port 111

Removing MAC Addresses from a Port 111

Displaying Port Information 111

Setting the Spanning Tree Path Cost 112

Enabling and Disabling Spanning Tree Fast Start 112

Displaying Port Summary Information 113 Enabling and Disabling VLT Tagging on a Port 114 Setting the Bridge Spanning Tree Forward Delay 114 Setting the Bridge Spanning Tree Hello Timer 115 Setting the Bridge Spanning Tree Maximum Age 115 Setting the Spanning Tree Bridge Priority 115 Enabling and Disabling Spanning Tree on a Bridge 116 Adding a Port to a VLAN 116 Creating a VLAN 116 Deleting a VLAN 117 Displaying Detailed VLAN Information 117 Modifying a VLAN 118 Removing a Port from a VLAN 119 Displaying Summary VLAN Information 119

Displaying and Changing Port Information 120

Enabling and Disabling Ports 120 Specifying the Speed and Duplex Mode 121 Enabling and Disabling Auto-negotiation 121 Enabling and Disabling Flow Control 123 Displaying Port Statistics 123

Packet Size Analysis 126

Displaying Port Summary Information 126

Displaying and Changing System Feature Information 127

Setting up a Roving Analysis Port 127 Displaying the Roving Analysis Port Information 127 Removing a Roving Analysis Port 128 Starting Data Monitoring 128 Stopping Data Monitoring 129 Enabling and Disabling Broadcast Storm Control 129 Setting Up a Resilient Link 130 Displaying Resilient Link Information 130 Removing a Resilient Link 131 Swapping over Active Links 131 Adding a Port to a Trunk 131 Displaying Detailed Trunk Information 132 Removing a Port from a Trunk 132 Displaying Summary Trunk Information 133

Displaying and Changing IP-related Information 133

Specifying IP and SLIP Information 133

Displaying IP and SLIP Information 135

Enabling and Disabling BOOTP 135

Pinging Other Devices 136

Resetting the IP Configuration 136 Displaying and Changing SNMP-related Information 137

Specifying SNMP Community Strings 137

Specifying Trap Destination Details 137

Displaying Trap Destination Details 138

Modifying Trap Destination Details 138

Removing Trap Destination Details 139

Performing an SNMP GET Command 139

Performing an SNMP GETNEXT Command 139

Performing an SNMP SET Command 140 Displaying and Changing Stack Information 141

Moving the Focus of the Command Line Interface 141

Returning the Focus to the Previous Switch Unit 142 Specifying Stack Administration Details 142 Displaying Switch Administration Details 143 Displaying Stack Summary Information 144 Configuring Intelligent Modules 146

Setting Module Configuration 146

Displaying Module Configuration 146

Enabling and Disabling the Module Interface 146 Changing Your Password 147 Specifying User Details 147 Displaying User Details 148 Modifying User Details 148 Removing User Details 149 Displaying Access Rights 149 Modifying Access Rights 150 Enabling and Disabling Remote Access 150 Resetting All the Units in the Stack 151

What Happens During a Reset? 151 Initializing All the Units in the Stack 152

What Happens During an Initialization? 152 Upgrading Management Software 153

III Management Reference

ORT TRUNKS

What are Port Trunks? 158 Port Trunks and Your Switch 158 Placing Ports in a Port Trunk 159 Port Trunk Example 160

IRTUAL

What are VLANs? 164 Benefits of VLANs 164 VLANs and Your Switch 165

VLAN Configuration for Beginners 171

VLAN Configuration - Advanced Examples 177

LANS (VLANS)

The Default VLAN 165 Defining New VLANs 166 Untagged and Tagged VLANs 166 Placing a Port in a Single VLAN 166 Placing a Port in Multiple VLANs 166

802.1Q Tagging 166

VLT Tagging 167 Using IEEE 802.1Q Learning 167 Forwarding Traffic Containing Unknown 802.1Q Tags 168 Connecting VLANs to Other VLANs 170 Connecting to VLANs on Legacy Switch Units 170

Simple Example: Using Untagged Connections 171 Simple Example: Untagged Connections with Hubs 172 Simple Example: 802.1Q Tagged Connections 174

Using 802.1Q Tagged Connections and 802.1Q Learning 177 Connecting to a Legacy Network 178

AST

What is FastIP? 182 How FastIP Works 182 An Example 183 FastIP and the Switch Database 186 Enabling FastIP 187

ULTICAST FILTERING

What is a Multicast? 190 What is Multicast Filtering? 190 Multicast Filtering and Your Switch 191

IEEE 802.1p Multicast Filtering 191

Enabling 802.1p Multicast Learning 191

IGMP Multicast Filtering 192

Enabling IGMP Multicast Learning 192

Manual Filtering 192

PANNING TREE PROTOCOL

What is STP? 194 How STP Works 196

STP Requirements 196 STP Calculation 197 STP Configuration 197 STP Reconfiguration 197 An Example 198

STP Configurations 199 Using STP on a Network with Multiple VLANs 201 Connecting to STP Systems on Legacy Switch Units 202 Enabling STP 202

RMON

What is RMON? 204

The RMON Groups 204

Statistics 204 History 204 Alarms 204 Hosts 205 Hosts Top N 205 Matrix 205

Events 205 Benefits of RMON 206 RMON and Your Switch 207

The Alarm Events 208 The Default Alarm Settings 208 The Audit Log 209

IV Problem Solving

ROBLEM SOLVING

Solving Web Interface Problems 214 Solving Command Line Interface Problems 216 Solving SNMP Management Software Problems 218 Solving Serial Web Utility Problems 219 Solving Management Software Upgrade Utility Problems 220 Solving Other Problems 221

V Appendices and Index

ERIAL WEB UTILITY

Introduction 227 Installing the Serial Web Utility 227 Using the Serial Web Utility 229

ANAGEMENT SOFTWARE UPGRADE UTILITY

Using the Upgrade Utility 231

LOSSARY

NDEX

BOUT

HIS

UIDE

Conventions

This guide provides all the information you need to manage units in the SuperStack software version 2.50.

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).

Throughout this guide, the term stack refers to a number of Switch units that are managed as a single unit. However, a stack can contain a single Switch. In the case of the 610/630 family, stackability is not supported.

If the information in the release notes that are shipped with your product differs from the information in this guide, follow the instructions in the release notes.

Ta bl e 1 and Tabl e 2 list conventions that are used throughout this guide.

Tab le 1

Icon Notice Type Description

II Switch 1100/3300 and 610/630 family with management

Notice Icons

Information note Information that describes important features or

instructions

Caution Information that alerts you to potential loss of data or

Warning Information that alerts you to potential personal injury

potential damage to an application, system, or device

14 A

BOUT THIS GUIDE

Tab le 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

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.

Year 2000 Compliance

In addition, there are other publications you may find useful:

■

Documentation accompanying the Expansion Modules.

■

Documentation accompanying the Transceiver Modules.

■

Documentation accompanying the Advanced Redundant Power System.

For information on Year 2000 compliance and 3Com products, visit the 3Com Year 2000 Web page:

http://www.3com.com/products/yr2000.html

16 A

BOUT THIS GUIDE

Documentation Comments

Product Registration

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:

■

SuperStack II Switch Management Guide

■

Part Number DUA1695-0BAA04

■

Page 21

You can now register your SuperStack II Switch on the 3Com web site to receive up-to-date information on your product:

http://www.3com.com/productreg/pdd

ETTING

ANAGEMENT

Chapter 1 SuperStack II Switch Management Software

Chapter 2 Setting Up for Management

TARTED WITH

UPERSTACK

II S

WITCH

ANAGEMENT

This chapter contains introductory information about the SuperStack® II Switch management software and how it can be used in your network. It covers the following topics:

■

What is Management Software?

■

Summary of Software Features

■

Software Features Explained

■

Default Settings

OFTWARE

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What is Management Software?

Summary of Software Features

Your Switch contains software that allows you to change and monitor the way it works. This

management

software is not required to get the Switch working, but if you do use it, you may improve the efficiency of the Switch and therefore improve the overall performance of your network.

Ta bl e 3 describes the software features that are supported by units in the

Switch 1100/3300 and 610/630 family.

Tab le 3

Feature Switch 1100/610 Family Switch 3300 /630 Family No. of MAC

Addresses Supported

Stack Management

Forwarding Modes

Duplex Modes

Flow Control Tra ffic

Prioritization PACE Security Resilient Links Port Trunking

Broadcast Storm Control

Virtual LANs (VLANs)

FastIP Multicast Filtering

Software features

Up to 6,000 Up to 12,000

Supported for up to four Switch units (stackability not supported on 610/630 units)

Store and Forward, Fast Forward, Fragment Free, Intelligent

Half and full duplex on all ports

Supported on all ports Supported on all ports Supported Supported

Supported on all ports Supported on all ports Supported on all ports Supported on all ports Supported Supported Support for two Port Trunks a

unit Supported Supported

Support for up to 16 VLANs using the IEEE 802.1Q standard

Supported Supported IEEE 802.1p and IGMP

filtering supported

Supported for up to four Switch units (stackability not supported on 610/630 units)

Store and forward

Half and full duplex on all ports

Support for two Port Trunks a unit

Support for up to 16 VLANs using the IEEE 802.1Q standard

IEEE 802.1p and IGMP filtering supported

Software Features Explained 21

Software Features Explained

Stack Management

Tab le 3

Feature Switch 1100/610 Family Switch 3300 /630 Family Spanning Tree

Protocol RMON

Roving Analysis Management

Software features

Supported Supported

Seven groups supported: Statistics, History, Alarms, Hosts, Hosts Top N, Matrix, Events

Supported Supported Web interface, command line

interface, and SNMP supported

Seven groups supported: Statistics, History, Alarms, Hosts, Hosts Top N, Matrix, Events

Web interface, command line interface, and SNMP supported

Units in the Switch 1100/3300 family can be interconnected so that they form a stack, that is, a group of devices that are managed as a single device.

Stackability is not supported by the Switch 610/630 units.

Forwarding Modes

You can interconnect these Switch units together in two ways:

■

The matrix port on the rear of each Switch allows you to connect two Switch units back-to-back. For this you need a Matrix Cable (part number 3C16965).

■

The Expansion Module slot at the rear of each Switch allows you to install a Matrix Module (part number 3C16960). The Matrix Module provides four ports and allows you to interconnect up to four units using Matrix Cables.

For information about stacking Switch units, refer to Chapter 2 of the relevant Switch User Guide.

Units in the Switch 3300/630 family support Store and Forward packet forwarding mode. In this mode, received packets are buffered entirely before they are forwarded, which ensures that only good packets are forwarded to their destination.

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Units in the Switch 1100/610 family support three forwarding modes in addition to Store and Forward:

■

Fast Forward

— Packets are forwarded as soon as the destination address is received and processed. With Fast Forward, packets take less time to be forwarded, but all error packets are propagated onto the network because no time is allowed for checking.

■

Fragment Free

— Packets are forwarded when at least 512 bits of the packet is received, which ensures that collision fragments are not propagated through the network. With Fragment Free, packets take less time to be forwarded, but all error packets except fragments are propagated.

■

Intelligent

— The Switch monitors the amount of error traffic on the network and changes the forwarding mode accordingly. If the Switch detects less than 20 errors a second, the forwarding mode is set to Fast Forward. If the Switch detects 20 or more errors a second, the forwarding mode is set to Store and Forward until the number of errors a second returns to zero.

For information about setting the forwarding mode for units in the Switch 1100/610 family, see on

page 76

“Configuring the Advanced Stack Settings”

Duplex Modes

All the ports on your Switch can be set to one of two duplex modes:

■

Half duplex

— Allows packets to be transmitted and received, but not

simultaneously. This is the default Ethernet duplex mode.

■

Full duplex

— Allows packets to be transmitted and received simultaneously and, in effect, doubles the potential throughput of a link. In addition, full duplex supports 100BASE-FX cable runs of up to 2km (6562ft).

To communicate effectively, both ends of a link must use the same duplex mode. If the link uses an auto-negotiating connection, this is done automatically. If the link uses a connection that is not auto-negotiating, both ends must be set to half duplex or full duplex manually.

For more information about setting the duplex mode of a port, see

“Configuring a Port”

page 59

Software Features Explained 23

Flow Control

Traffic Prioritization

All the ports on your Switch support flow control, which is a congestion control mechanism. Congestion is caused by one or more devices sending traffic to an already overloaded port on the Switch. Flow control prevents packet loss and inhibits the devices from generating more packets until the period of congestion ends.

Flow control is implemented in two ways:

■

IEEE 802.3x standard for ports operating in full duplex.

■

Intelligent Flow Management (IFM), a 3Com proprietary method of flow control, for ports operating in half duplex. IFM should only be enabled if the port is connected to another switch, or an endstation. If the port is connected to a repeated segment with local traffic, IFM should be disabled.

For information about enabling flow control on a port, see

a Port”

page 59

“Configuring

Your Switch supports IEEE 802.1p traffic prioritization, which allows data that has been assigned a high priority to be forwarded through the Switch without being obstructed by other data. The system works by using the multiple traffic queues that are present in the hardware of the Switch — high priority traffic is forwarded on a different queue from other traffic, and it is always given preference over the other traffic.

Traffic prioritization can be useful for critical applications that require a high Class of Service (CoS) from the network. This could include:

■

Financial applications

— Accounts departments that need immediate access to large files and spreadsheets at the end of the month.

■

CAD/CAM design applications

— Design departments that need priority connections to server farms and other devices for transferring large files.

■

Converged network applications

— Organizations with a converged network (that is, a network that uses the same infrastructure for voice data and traditional data) that require high quality voice data transmission at all times.

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If you use IEEE 802.1p traffic prioritization, we recommend that all relevant ports on your Switch are placed in one or more Virtual LANs (VLANs) using 802.1Q tagging. For a brief explanation of VLANs, see

“Virtual LANs”

page 26

802.1Q tagging, see

. For a detailed explanation of VLANs and

“Virtual LANs (VLANs)”

page 163

PACE

Security

Your Switch supports PACE (Priority Access Control Enabled) which is a 3Com proprietary feature that allows multimedia traffic to move across a network effectively.

PACE provides two main features:

■

Implicit Class of Service

— This feature gives priority to traffic from

multimedia applications, and provides the same functionality as IEEE

802.1p traffic prioritization (see “Traffic Prioritization”

■

Interactive Access

— When two-way multimedia traffic passes over

on page 23).

an Ethernet or Fast Ethernet network, interference can occur because access to the bandwidth is unequally allocated to traffic in one direction. The Interactive Access feature allocates the available bandwidth equally in both directions, therefore increasing the quality of the multimedia traffic.

For information about enabling PACE on an individual port, see

“Configuring a Port”

page 59

on a whole Switch or stack, see

Settings”

page 76

. For information about enabling PACE

“Configuring the Advanced Stack

Each port on your Switch can use a security feature that guards against unauthorized users connecting devices to your network. When security is enabled on a port, it enters Single Address Learning Mode. In this mode, the Switch:

■

Removes all the MAC (Ethernet) addresses stored for the port in the Switch Database. For more information about the Switch Database, see “What is the Switch Database?”

■

Learns the address of the first packet it receives on the port.

■

Defines the address as a permanent entry.

on page 72.

Once the first address is learned:

■

The port is disabled if a different address is seen on the port.

Software Features Explained 25

■

No other address can be learned until security is disabled or the address is manually removed from the database.

■

The address cannot be learned on another port until security is disabled or the address is manually removed from the database.

Resilient Links

Port Trunks

For more information about enabling security on a port, see

a Port”

page 59

“Configuring

The resilient link feature of the Switch enables you to protect critical links and prevent network downtime should those links fail. Setting up resilience ensures that if a main communication link fails, a standby duplicate link immediately and automatically takes over the task of the main link. Each main and standby link pair is referred to as a resilient link pair.

Resilient links are a simple method of creating redundancy that provides you with an instant reaction to link failure. Resilient links are quick to set up, you have full control over their configuration, and the port at the other end of the resilient link does not have to support any resilience feature.

For more information about resilient links, see

Links”

page 79

“Setting Up Resilient

Your Switch supports port trunks — connections that allow devices to communicate using up to four links in parallel. Port trunks provide two benefits:

■

They can potentially double, triple or quadruple the bandwidth of a connection.

■

They can provide redundancy — if one link is broken, the other links share the traffic for that link.

For more information about port trunks, see

“Port Trunks”

page 157

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Broadcast Storm

Control

Virtual LANs

Your Switch supports Broadcast Storm Control, a system that automatically creates an alarm for each port to monitor the level of broadcast traffic on that port.

frames per

broadcast

second, the broadcast traffic on the port is blocked until the

traffic level drops to 1488 frames per second.

If the broadcast traffic level rises to 2976

This system prevents the overwhelming broadcast traffic that can result from network equipment which is faulty or configured incorrectly.

For more information about enabling Broadcast Storm Control, see

“Configuring the Advanced Stack Settings”

page 76

Your Switch provides supports for up to 16 Virtual LANs (VLANs). A VLAN is a flexible group of devices that can be located anywhere in a network, but they communicate as if they are on the same physical segment. With VLANs, you can segment your network without being restricted by physical connections — a drawback of traditional network design. As an example, with VLANs you can segment your network according to:

■

Departmental groups

— For example, you can have one VLAN for the Marketing department, another for the Finance department, and another for the Development department.

■

Hierarchical groups

— For example, you can have one VLAN for

directors, another for managers, and another for general staff.

FastIP

■

Usage groups

— For example, you can have one VLAN for users of

e-mail, and another for users of multimedia.

For more information, see

“Virtual LANs (VLANs)”

page 163

Your Switch supports FastIP, a system that reduces the load on routing devices when VLANs are implemented on your network.

Devices within different VLANs can only communicate using a routing device; if there is a large amount of inter-VLAN traffic, the router can become overloaded and network performance can be affected. FastIP allows your endstations and Switch units to find secure short-cuts for inter-VLAN traffic that bypass the routing device altogether.

For more information about FastIP, see

“FastIP”

page 181

Software Features Explained 27

Multicast Filtering

Spanning Tree

Protocol

Your Switch supports two multicast filtering systems:

■

IEEE 802.1p, which uses the GARP Multicast Registration Protocol (GMRP)

■

IGMP (Internet Group Management Protocol)

These systems allow the Switch to forward multicast traffic to the endstations that are interested rather than broadcasting the traffic to the whole network.

For more information, see

“Multicast Filtering”

page 189

Your Switch supports the Spanning Tree Protocol (STP), a bridge-based system that makes your network more resilient to link failure and also provides a protection from loops — one of the major causes of broadcast storms.

STP allows you to implement parallel paths for network traffic and uses a loop-detection process to:

■

Discover the efficiency of each path.

■

Enable the most efficient path (that is, the one that has the highest bandwidth).

■

Disable the less efficient paths.

RMON

■

Enable one of the less efficient paths if the most efficient path fails.

For information about STP, see

“Spanning Tree Protocol”

For information about enabling STP, see

Stack Settings”

page 76

“Configuring the Advanced

page 193

Your Switch supports RMON (Remote Monitoring), a system that allows you to monitor LANs remotely. The Switch contains RMON probe software that continually collects statistics about the LAN segments connected to the Switch. If you have a management workstation with an RMON management application, the Switch can transfer these statistics to your workstation on request or when a pre-defined threshold is crossed.

For more information, see

“RMON”

page 203

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Roving Analysis

Management

Your Switch supports roving analysis, a system that allows you to attach a network analyzer to one port and use it to monitor the traffic of other ports on the Switch. The system works by enabling you to define an analysis port (the port that is connected to the analyzer), and a monitor port (the port that is to be monitored). Once the pair are defined, and you enable the system, the Switch takes all the traffic going in and out of the monitor port and copies it to the analysis port.

Roving analysis is used when you need the functions of a network analyzer, but do not want to change the physical characteristics of the monitored segment by attaching an analyzer to that segment.

For information about setting up roving analysis ports, see

Roving Analysis Ports”

page 86

“Setting Up

Your Switch can be managed using three methods:

■

Web interface management

— The Switch has an internal set of web pages that allow you to manage it using any Java-enabled Web browser. You can access the web interface using:

A management workstation connected over the network

■

A management workstation connected to the console port of the

■

Switch, running the Serial Line Internet Protocol (SLIP)

■

Command line interface management

— The Switch has a command line interface that allows you to perform limited management. You can access the command line interface using:

A terminal or terminal emulator connected over the network

■

using Telnet A terminal or terminal emulator connected to the console port of

■

the Switch

■

SNMP management

— You can manage the Switch using any network management application running the Simple Network Management Protocol (SNMP), such 3Com Transcend

Enterprise

Manager software.

For information about setting up your Switch for management, see

“Setting Up for Management”

page 31

Default Settings 29

Default Settings

Ta bl e 4 shows the default settings of units in the Switch 1100/3300 and

610/630 family. If you initialize one of these Switch units, it is returned to these defaults.

Tab le 4

Port Status Port Speed

Forwarding Mode

Duplex Mode

Flow Control

PACE Security Broadcast

Storm Control BOOTP Virtual LANs

(VLANs)

FastIP Multicast

Filtering Spanning Tree

Protocol RMON Alarm

(broadcast bandwidth used)

Default Settings

Switch 1100/610 Family Switch 3300/630 Family

Enabled Enabled 10BASE-T/

100BASE-TX ports are auto-negotiated.

Intelligent Store-and-forward

All fixed 10BASE-T and 10BASE-T/100BASE-TX ports are auto-negotiated.

Enabled in half duplex, auto-negotiated in full duplex

Disabled Disabled Disabled Disabled Enabled Enabled

Enabled Enabled All ports belong to the

untagged Default VLAN (VLAN 1) only; 802.1Q learning is disabled

Disabled Disabled

802.1p and IGMP filtering are both disabled

Disabled Disabled

Enabled: High threshold: 2976 broadcast frames per second — Notify and filter Low threshold: 1488 broadcast frames per second — Notify and unfilter

10BASE-T/100BASE-TX ports are auto-negotiated; 1000BASE-T and 1000BASE-SX ports are permanently fixed at 1000Mbps

All fixed 10BASE-T/100BASE-TX ports are auto-negotiated; all fixed 100BASE-FX ports are half duplex; all 1000BASE-T and !000BASE-SX ports are permanently set to full duplex.

Enabled in half duplex, auto-negotiated in full duplex

All ports belong to the untagged Default VLAN (VLAN 1) only; 802.1Q learning is disabled

802.1p and IGMP filtering are both disabled

Enabled: High threshold: 2976 broadcast frames per second — Notify and filter Low threshold: 1488 broadcast frames per second — Notify and unfilter

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Tab le 4

Default Settings

RMON Alarm (errors over 1min)

Switch 1100/610 Family Switch 3300/630 Family

Enabled: High threshold: 20 errors per second — Notify Low threshold: 1 error per second — No action

ETTING

This chapter explains the various ways of managing a Switch, and details the steps required before you can configure a Switch to suit the needs of your network. It covers the following topics:

■

Methods of Managing a Switch

■

Setting Up Web Interface Management

■

Setting Up Command Line Interface Management

■

Setting Up SNMP Management

■

Managing a Switch Over the Network

■

Logging in as a Default User

FOR

ANAGEMENT

32 C

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ETTING UP FOR MANAGEMENT

Methods of Managing a Switch

You can manage a Switch using one of the following methods:

■

Web interface management

pages that allow you to manage the Switch using a Java

— Each Switch has an internal set of web

-enabled

Web browser.

■

Command line interface management

— Each Switch has a command

line interface that allows you to manage the Switch.

■

SNMP management

— You can manage a Switch using any Network Manager running the Simple Network Management Protocol (SNMP), such as 3Com Transcend

Enterprise Manager software.

For maximum manageability, we recommend that you use 3Com Transcend Enterprise Manager software.

Figure 1

shows each of these management methods.

Management methods

Setting Up Web Interface Management 33

Setting Up Web Interface Management

Setting Up Through

the Console Port

You can access the web interface using:

■

A management workstation connected to the console port of a Switch, running the Serial Line Internet Protocol (SLIP).

■

A management workstation connected to a Switch over an IP network.

While multiple users can access the web interface at any one time, too many users may result in a slow response time for the web pages and the error message “document contains no data”. We therefore recommend that you allow only three users access to the interface at any one time.

To manage a Switch using the web interface through the console port:

You must connect the management workstation to the console port

directly using a standard null modem cable. The console port of the Switch has a male 9-pin d-type connector. You can find a pin-out diagram for the cable in your Switch User Guide.

To connect the cable:

Attach the female connector on the cable to the male connector on

the console port of the Switch. Tighten the retaining screws on the cable to prevent it from being

loosened. Connect the other end of the cable to your management workstation.

The management workstation must be running the Serial Line Interface

Protocol (SLIP), and the SLIP parameters (address and subnet mask) of the Switch need to be configured correctly. To do this, you must install, configure and run the Serial Web Utility described in “Serial Web Utility” on page 227

Install the online help and online documentation for the web interface, if

required. For more information, see “Installing Online Help and

Documentation” on page 34.

Access the web interface using the correct user name and password.

Default user names and passwords are described in “Logging in as a

Default User” on page 39.

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Setting Up Over the

Network

Installing Online Help

and Documentation

To manage a Switch using the web interface over an IP network:

You must set up the Switch with IP information. To do this:

Access the web interface of the Switch through the console port. See

“Setting Up Through the Console Port”

Use the Getting Started pages or IP Setup page to enter suitable IP

on page 33.

information for the Switch. For more information about IP, see “Managing a Switch Over the

Network” on page 38. For more information about the Getting

Started pages, see “The Getting Started Pages”

on page 46. For more information about the IP Setup page, see “Setting Up IP Information” on page 58

You must have an IP stack correctly installed on your management

workstation. You can check this by trying to browse the World Wide Web; if you can browse, an IP stack is installed.

Your management workstation must be connected to the Switch using a

port that is in VLAN 1 (the Default VLAN). By default, all ports on the Switch are in VLAN 1. For more information about VLANs, see “Virtual

LANs (VLANs)” on page 163.

The CD-ROM supplied with your Switch contains online help and online documentation that can be used with the web interface:

■

The online help system provides information for units in the Switch family, and is in HTML (HyperText Markup Language) format.

■

The online documentation comprises:

This Management Guide

■

User Guides of all units in the Switch family

■

All the online documentation is in HTML and PDF (Portable Document Format).

To set up the online help and documentation: Decide where the files are to be stored:

■

On a local drive of your management workstation (recommended)

■

On the CD-ROM, inserted into the CD-ROM drive of your management workstation

■

On a network server

Setting Up Web Interface Management 35

■

On the CD-ROM, inserted into the CD-ROM drive of a networked CD-ROM server

■

On a Web server

If several users are using the web interface, we recommend that you copy the files onto a server, or insert the CD-ROM into a networked CD-ROM server.

If the files are to be accessed from the CD-ROM, insert the CD-ROM into

the relevant CD-ROM drive. If the files are to be accessed from a local drive or server, copy the files

from the CD-ROM to the relevant directory:

■

The help files are stored in the help files are accessed using the

■

The documentation files are stored in the

directory on the CD-ROM. The

/help

index.htm

file.

directory on the

/docs

CD-ROM. All versions of the documentation are accessed using the

index.htm

We recommend that you copy the

file.

/help

and the

/docs

directory as

a whole to maintain the structure of the files.

Choosing a Browser

Configuring the

Browser

CAUTION:

When entering file paths and URLs, ensure that you use / characters rather than \ characters to define drives and directories. The web interface only understands UNIX file path conventions.

To display the web interface correctly, you must use a Web browser that supports:

■

Java

■

Frames

■

HTML 3.2

Suitable Web browsers are:

■

Netscape Navigator Version 3.xx and 4.xx

■

Microsoft Internet Explorer Version 3.0 or above

At the time of writing, we have not tested Netscape Navigator Version

5.0 fully with the web interface. Please refer to the Release Notes for any further information.

For an optimal display of the web interface, we recommend that you configure your Web browser to use the

font by default.

12pt

Times 12pt

Times New Roman

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Setting Up Command Line Interface Management

Setting Up Through

the Console Port

You can access the command line interface using:

■

A terminal or terminal emulator connected to the console port of a Switch directly, or through a modem

■

A terminal or terminal emulator connected to a Switch over an IP network using Telnet

To manage a Switch using the command line interface through the console port:

You must connect the terminal or terminal emulator to the console port

correctly. If you are connecting directly to the console port, you need a standard null modem cable. If you are connecting to the console port using a modem, you need a standard modem cable. The console port of the Switch has a male 9-pin d-type connector. You can find pin-out diagrams for both cables in your Switch User Guide.

To connect the cable:

Attach the female connector on the cable to the male connector on

the console port of the Switch. Tighten the retaining screws on the cable to prevent it from being

loosened. Connect the other end of the cable to your terminal, terminal

emulator, or modem.

The terminal, terminal emulator, or modem must use the same settings as

the console port:

■

8 data bits

■

no parity

■

1 stop bit

To configure the settings of the terminal, terminal emulator, or modem, see the documentation that accompanies it. If the Switch containing the console port has auto-configuration enabled (default), the line speed (baud) is detected automatically. The Switch can auto-detect a maximum line speed of 19,200 baud.

Access the command line interface using the correct user name and

password. Default user names and passwords are described in “Logging

in as a Default User” on page 39.

Setting Up SNMP Management 37

Setting Up Over the

Network

To manage a Switch using the command line interface over a network using Telnet:

You must set up the Switch with IP information. To do this:

Access the command line interface of the Switch through the console

port. See “Setting Up Through the Console Port”

Use the

ip interface define

command to enter suitable IP

on page 36.

information for the Switch. For more information about IP, see “Managing a Switch Over the

Network” on page 38. For more information about the ip

interface define

command, see “Specifying IP and SLIP

Information” on page 133.

If you are using a terminal emulator, you must have an IP stack correctly

installed on the terminal emulator. Your terminal or terminal emulator must be connected to the Switch

using a port that is in VLAN 1 (the Default VLAN). By default, all ports on the Switch are in VLAN 1. For more information about VLANs, see

“Virtual LANs (VLANs)”

To open the Telnet session, you must specify the IP address of the Switch.

on page 163.

Check the documentation supplied with the Telnet facility if you are unsure how to do this.

Setting Up SNMP Management

Any network management application running the Simple Network Management Protocol (SNMP) can manage a Switch if:

■

The correct MIBs (Management Information Bases) 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. For more information about VLANs, see “Virtual LANs

(VLANs)” on page 163.

For information about using an SNMP network management application to manage a Switch, see the documentation supplied with the 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 — see

“Specifying SNMP Community Strings”

page 137

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Managing a Switch Over the Network

IP Addresses

When managing a Switch over the network, the Switch must be correctly configured with the following IP information:

■

An IP address — for more information, see “IP Addresses” on

page 38

■

A subnet mask — for more information, see “Subnets and Using a

Subnet Mask” on page 39.

If you are uncertain about what IP addresses to assign your equipment, contact your network administrator.

To operate correctly, each device on your network (for example a hub or management station) must have a unique IP address (if one is configured). 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 can be split into two parts:

■

The first part (‘192.168’ in the example) identifies the network on which the device resides.

■

The second part (‘100.8’ in the example) identifies the device within the network.

If your network is internal to your organization only, you may use any arbitrary IP address. We suggest you use addresses in the series

192.168.100.X (where X is a number between 1 and 254) with a subnet mask 255.255.255.0. Use the default SLIP address of 192.168.101.1 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.

CAUTION:

If your network has a connection to the external IP network, you must apply for a registered IP address. This 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.

Obtaining a Registered IP Address

InterNIC Registration Services is the organization responsible for supplying registered IP addresses. The following contact information is correct at time of publication:

Logging in as a Default User 39

Subnets and Using a

Subnet Mask

World Wide Web site:

http://www.internic.net

You can divide your IP network into sub-networks or subnets. Support for subnets is important because the number of bits assigned to the device part of an IP address limits the number of devices that may be addressed on any given network. For example, a Class C address is restricted to 254 devices.

If you have a small network (less than 254 devices), you may decide not to have subnets.

A subnet mask is used to divide the device part of the IP address into two further parts:

The first part identifies the subnet number.

■

The second part identifies the device on that subnet.

■

The bits of the subnet mask are set to 1 if the device is to treat the corresponding bit in the IP address as part of the original network number or as part of the subnet number. These bits in the mask are set to 0 if the device is to treat the bit as part of the device number.

If you are unsure about what mask to use, we suggest that you use a general mask, 255.255.0.0, which corresponds to the example address used in the previous sections.

Logging in as a Default User

If you manage a Switch using the web interface or the command line interface, you need to log on with a valid user name and password. The Switch has four default user names, and each user name has a different password and level of access. These default user names are listed in

Ta bl e 5

Tab le 5

Default Users

User Name

monitor monitor monitor — the user can view, but not change all

manager manager manager — the user can access and change the operational

Default Password Access Level

manageable parameters

parameters but not special/security features

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Tab le 5

User Name

security security security — the user can access and change all manageable

admin (no

CAUTION:

Default Users

Default

Password Access Level

parameters security — the user can access and change all manageable

password)

parameters

To protect your Switch from unauthorized access, you must

change all default passwords as soon as possible.

Chapter 3 Working With the Web Interface

Chapter 4 Working With the Command Line Interface

ANAGEMENT INTERFACES

ORKING

ITH THE

NTERFACE

This chapter describes how to access and use the web interface. It covers the following topics:

■

Accessing the Web Interface

■

The Getting Started Pages

■

The Main Web Interface

■

Configuring the Current Switch

■

Changing the Management Settings for the Stack

■

Configuring the Stack

■

Displaying Statistics for the Current Switch

Throughout this chapter, the term stack refers to a number of Switch units that are managed as a single unit. However, a stack can contain a single Switch.

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Accessing the Web Interface

You can access the web interface through the console port or over the network.

To access the web interface

through the console port

, you must install, configure and run the Serial Web Utility described in “Serial Web Utility” on page 227

. Note that the Serial Web Utility is only required if you want to access the web interface through the console port; it is not required for access over the network.

To access the web interface Ensure that your network is correctly set up for management using the

over the network

, take the following steps:

web interface. For more information, see “Setting Up Web Interface

Management” on page 33.

Open your Web browser.

In the Location field of the browser, enter the URL of the stack. This must

be in the format:

http://

where

nnn.nnn.nnn.nnn/

nnn.nnn.nnn.nnn

is the IP address of the stack.

When the browser has located the stack, a user name and password dialog is displayed as shown in Figure 2

Figure 2

User name and password dialog

If the user name and password dialog is not displayed, see

Interface Problems”

page 214

“Solving Web

Accessing the Web Interface 45

Enter your user name and password:

■

If you have been assigned a user name and password, enter those details.

■

If you are accessing the web interface for the first time, enter a default user name and password to match your access requirements. The defaults are described in “Logging in as a Default User”

on page 39. If you are setting up the stack for management, we suggest that you log on as

(which has no default password).

admin

To prevent unauthorized configuration of the stack, we recommend that you change the default passwords as soon as possible. To do this using the web interface, you need to log in as each default user and then follow the steps described in “Changing Your Password”

on page 68.

If you forget your password while logged out of the web interface, see

“Solving Web Interface Problems”

page 214

Once you have entered a correct user name and password, one of two events occur:

■

If you are accessing the web interface for the first time, a set of Getting Started pages are displayed. These are described in “The

Getting Started Pages” on page 46.

■

If you have accessed the web interface before, the main web interface is displayed. For information about the interface, see “The Main Web

Interface” on page 48.

Exiting the Web

Interface

If you are unable to access the web interface, see “Solving Web Interface

Problems” on page 214.

CAUTION:

While you are managing the stack, you can display other web pages using your browser, and then simply use the Back button to reload the web management pages. You do not need to re-enter your username and password.

You can exit the web interface at any time; to do this, close your Web browser. For security reasons, you should always close your Web browser after a management session.

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The Getting Started Pages

When you access the web interface for the first time or after a power-off/on cycle, a set of Getting Started pages are displayed. The first Getting Started page, Getting Started - Introduction is shown in Figure 3

Figure 3

The Getting Started - Introduction page

The Getting Started pages allow you to enter basic setup information for the stack. As you go through the pages, you are asked to enter:

A descriptive name for the stack.

Whether you want to allocate IP information for the stack, or whether

you want a BOOTP server (if you have one) to allocate the information automatically.

If you choose to allocate IP information yourself, you are prompted to enter the following information:

■

An IP address for the stack. For more information about IP addresses, see “Managing a Switch Over the Network”

■

A subnet mask for the stack. For more information about subnet masks, see “Subnets and Using a Subnet Mask”

■

An IP address for the default router, if one exists on your network.

on page 38.

on page 39.

If you choose to allocate IP information using a BOOTP server, no prompts are displayed.

The Getting Started Pages 47

The URL or file path of the online help and online documentation for the

stack.

■

If the files are installed on your management workstation, on the CD-ROM, or on a network server, you must begin the file path with

file://

■

If the files are stored on a Web server, you must begin the URL with

http://

If you do not know where the online help and online documentation is stored, see “Installing Online Help and Documentation”

A new password for the current user (enter the existing password if you

on page 34.

want to leave the password unchanged).

Once you have completed the Getting Started pages, the main web interface is displayed. For information about the interface, see “The Main

Web Interface” on page 48.

The Getting Started pages are available from the main web interface at any time. For more information, see

Settings for the Stack”

page 67

“Changing the Management

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The Main Web Interface

The main web interface is made up of three areas:

■

The Banner

This is always displayed at the top of the browser window. It displays the name of the current Switch in the stack, and contains several External Link icons that allow you to access information outside of the web interface. For more information about the External Links, see

“The External Link Icons”

■

The Side-bar

on page 49.

This is always displayed down the left side of the browser window. It contains Management Icons that allow you to display web pages in the page area (below). For more information, see “The Management

Icons” on page 50.

■

The Page Area

This is always displayed in the center of the browser window. It contains the various web pages that allow you to manage the stack. For more information, see “The Page Area”

Figure 4

Parts of the main web interface

on page 50.

The Main Web Interface 49

The External Link

Icons

The banner of the main web interface contains several External Link icons that allow you to access information outside of the interface; these are shown in Ta b le 6

Tab le 6

External Link Icon Action

External Link icons and their actions

If your management workstation has access to the World Wide Web, clicking the 3Com icon displays the home page of the 3Com World Wide Web site in a second browser window.

If you have set up the online help, clicking the Help icon displays the help for the web interface in a second browser window.

For information about setting up the online help, see

“Installing Online Help and Documentation” page 34

If you have set up the online documentation, clicking the Documentation icon allows you to access the User Guides and Management Guide for the stack in a second browser window.

For information about setting up the online documentation, see

page 34

“Installing Online Help and Documentation”

If your management workstation has access to the World Wide Web, clicking the 3Com Library icon displays the Online Library of the 3Com World Wide Web site in a second browser window.

If your management workstation has access to the World Wide Web, clicking the 3Com Support icon displays support information from the 3Com World Wide Web site in a second browser window.

If your management workstation has access to the World Wide Web, clicking the 3Com Contacts icon displays contact information from the 3Com World Wide Web site in a second browser window.

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The Management

Icons

The side-bar of the main web interface contains several Management Icons that allow you to display web pages in the page area; these are shown in Ta b le 7

Tab le 7

Management Icon Action

Management Icons and their actions

Management Settings — Click on this icon to display the Management Settings pages for the stack.

Configuration — Click on this icon to display the Configuration pages for the stack.

Health — Click on this icon to display the Health pages for the current Switch unit in the stack.

Unit — Click on this icon to display the Unit pages for the current Switch unit in the stack. To display the Unit pages for a specific unit in a stack, click on that unit in the Unit icon.

The Page Area

For an overview of the pages accessed using these icons, see “The Page

Area” on page 50.

The page area of the main web interface contains web pages that allow you to manage the stack. The web pages are grouped into four categories:

■

Unit Pages

— These pages allow you to configure the current Switch

in the stack and the ports on that Switch:

Switch Graphic

■

— This page contains a graphic of the Switch that allows you to display the status of the ports. It is always displayed above the other Unit pages.

Color Key

■

— This page allows you to display the color-coding

information used by the Switch Graphic page.

Port Summary

■

— This page allows you to display the speed and duplex mode of the ports shown in the graphic on the Switch Graphic page.

The Main Web Interface 51

■

Unit Status

— This page allows you to display the general

administration details of the Switch.

■

IP Setup

— This page allows you to set up IP information for the

Switch.

■

Port Setup

— This page allows you to configure individual ports

on the Switch.

■

Console Port Configuration

— This page allows you to configure

the console port of the Switch.

For more information, see “Configuring the Current Switch”

page 54

■

Management Settings Pages

— These pages allow you to change

the management settings for the stack:

■

System Name

— This page allows you to specify a descriptive

name for the stack.

■

Password Setting

— This page allows you to change your

password.

■

Location

— This page allows you to specify the physical location

of the stack.

■

Getting Started

— This page allows you to access the Getting

Started pages for the stack.

■

Documentation

— This page allows you to specify the location of

the online help and documentation for the stack.

■

Contact

— This page allows you to specify the details of a person

to contact about the stack.

For more information, see “Changing the Management Settings for

the Stack” on page 67.

■

Configuration Pages

— These pages allow you to configure the

stack as a whole:

■

VLAN Setup

— This page allows you to configure VLANs for the

stack.

■

Switch Database

— This page allows you to configure the Switch

Database of the stack.

■

Software Upgrade

— This page allows you to upgrade the

management software of the Switch units in the stack.

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■

Roving Analysis Setup

— This page allows you to set up roving

analysis ports for the stack.

■

Resilient Links

— This page allows you to set up resilient links for

the stack.

■

— This page allows you to reset the Switch units in the

Reset

stack.

■

Port Trunks Setup

— This page allows you to set up port trunks

for the stack.

■

Initialize

— This page allows you to initialize the Switch units in

the stack.

■

Advanced Stack Setup

— This page allows you to configure the

advanced settings of the stack.

For more information, see “Configuring the Stack”

■

Health Pages

— These pages allow you to display statistics for the

on page 71.

current Switch in the stack:

■

Unit Graph

— This page allows you to display a range of statistics

for all the ports on the Switch.

■

Port Graph

— This page allows you to display a range of statistics

for a specific port on the Switch.

For more information, see “Displaying Statistics for the Current

Switch” on page 91.

Navigating the Page Area

To access the first page of each category, click on the relevant Management Icon on the side-bar; to access the remaining pages in the category, click on the underlined hotlinks that are displayed at the top of each page.

There are four exceptions to the navigation system. The Color Key page, Port Summary page, Port Setup page and Console Port Configuration page are accessed from the Switch Graphic page.

Figure 5

shows you how to access each of the web pages.

The Main Web Interface 53

Figure 5

Web interface map

Making Changes in the Page Area

If you change any setting on a page in the page area, you

Apply

button at the bottom right of the page to make the change to the

stack. The change is only made when you click the

Apply

must

button.

click the

If you make changes on a page but do not wish to apply them, click the Back button in your Web browser to exit the page.

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Configuring the Current Switch

Displaying the Status

of the Ports

You can configure the current Switch and the ports on that Switch using the Unit Pages. These pages allow you to:

■

Display the status of the ports on the Switch

■

Display the general administration details of the Switch

■

Set up IP information for the Switch

■

Configure individual ports on the Switch

■

Configure the console port of the Switch

You can display the status of ports on the Switch using the Switch Graphic page.

To access the page:

■

Click the displayed, containing a graphic of the Switch similar to Figure 6

Unit

icon on the side-bar. The Switch Graphic page is

. Note

that this page is always displayed above the other Unit pages.

Figure 6

The Switch graphic

Displaying the Color Codes Used by the Switch Graphic

The Switch graphic indicates the status of a port using color-coding:

■

Green — Enabled, connected

■

Black — Enabled, disconnected

■

Gray (with connection) — Disabled, connected

■

Gray (without connection) — Disabled, disconnected

You can display the color-coding information using the Color Key page. To access the page, click the

Color Key

hotlink under the Switch graphic.

Configuring the Current Switch 55

Displaying the Speed and Duplex Mode of Ports

You can display the speed and duplex mode of ports in the Switch graphic using the Port Summary page.

To access the page:

■

Click the

Summary

Summary page is displayed as shown in Figure 7

hotlink under the Switch graphic. The Port

Figure 7

The Port Summary page

If you have an Expansion Module fitted to your Switch, the Expansion Module port numbers follow on sequentially from the number of fixed ports.

Refreshing the Switch Graphic

The Switch graphic does not update itself automatically — if you make a change to the status of a port, you need to click the

Refresh

hotlink positioned under the Switch graphic. If, after clicking Refresh, the Switch graphic does not update, you may need to make a small change to your Web browser; for more information, see “Solving Web Interface

Problems” on page 214.

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Displaying

Administration

Details

You can display general administration details about the Switch using the Unit Status page.

To access the page:

■

Click the shown in Figure 8

Unit

icon on the side-bar. The Unit Status page is displayed as

. Some fields are only displayed after a software upgrade failure. These fields display information about the software upgrade.

Figure 8

The Unit Status page

The Unit Status page contains the following elements:

System Name

Displays the name given to the Switch during the Getting Started procedure. For information about assigning a new name for the Switch, see “Specifying a Descriptive Name”

on page 67.

Location

Displays the physical location of the Switch. For information about assigning a new location for the Switch, see “Specifying a Physical

Location” on page 69.

Contact

Displays the details of a person to contact about the Switch. For information about assigning new contact details, see “Specifying Contact

Details” on page 71.

Unit Description

Displays the product name of the Switch.

Configuring the Current Switch 57

Hardware Rev

Displays the version number of the Switch hardware.

MAC Address

Displays the MAC (Ethernet) address assigned to the Switch.

Software Version

Displays the version number of the management software currently installed on the Switch. For information about how to upgrade the management software, see “Upgrading Management Software”

page 89

Boot PROM Version

Displays the version of Boot PROM software installed on the Switch.

Product Number

Displays the 3Com product number of the unit.

TFTP Server (optionally displayed)

Displays the IP address of the last TFTP server used to upgrade the unit’s management software.

Filename (optionally displayed)

Displays the name of the management software file that was used during the last software upgrade attempt.

Software Upgrade Status (optionally displayed)

Displays the reason for a software upgrade failure.

Unit Uptime

Displays the time that has elapsed since the Switch was last reset, initialized or powered-up.

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Setting Up IP

Information

You can set up the IP information for the Switch using the IP Setup page.

To access the page: Click the

Click the

displayed as shown in Figure 9

Figure 9

Unit

icon on the side-bar. The Unit Status page is displayed.

IP Setup

hotlink on the Unit Status page. The IP Setup page is

The IP Setup page

The IP Setup page contains the following elements:

IP Address

Allows you to enter a unique IP address for the Switch. For more information about IP addresses, see “Managing a Switch Over the

Network” on page 38.

If you change the IP address of the Switch, you can no longer access the web interface unless you enter the new IP address in the Location field of your browser.

Subnet Mask

Allows you to enter a subnet mask for the Switch. For more information about subnet masks, see “Subnets and Using a Subnet Mask”

page 39

Configuring the Current Switch 59

Default Router

If your network contains one or more routers, this field allows you to enter the IP address of the default router. For more information about IP addresses, see “Managing a Switch Over the Network”

BOOTP

On / Off

on page 38.

If you have a BOOTP server on your network, these radio buttons allow you to specify whether the server allocates IP information for the Switch automatically.

For BOOTP to work correctly, the Switch must have the IP address 0.0.0.0. If the Switch has another IP address, you must change the address to

0.0.0.0 and then reset the Switch.

The Switch only requests IP information from the BOOTP server 12 times. If the Switch has not received the information by the 12th time, you must reset the Switch and start again.

After BOOTP is enabled, you need to power cycle the unit before BOOTP starts operating

Configuring a Port

You can configure individual ports on the Switch using the Port Setup page.

To access the page: Click the

Click the relevant port on the Switch graphic. The Port Setup page is

displayed as shown in Figure 10

icon on the side-bar.

Unit

or Figure 11.

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Figure 10

Figure 11

The Port Setup page with auto-negotiation enabled

The Port Setup page with auto-negotiation disabled

Configuring the Current Switch 61

The Port Setup page contains the following elements:

Port

Displays the number of the selected port.

Link State

Enabled

/ Disabled

Displays the state of the link connected to the port.

Media Type

Displays the media type of the link connected to the port.

Port Speed

Displays the current speed and duplex mode of the port. FC indicates that flow control is enabled.

Auto-negotiation

Enabled

/ Disabled

Allows you to specify whether auto-negotiation is enabled for twisted pair ports:

■

If auto-negotiation is enabled on a 10BASE-T/100BASE-TX port, the speed and duplex mode of the link is automatically detected and set accordingly. (See the note below headed Switch 610 and Switch 1100.)

■

If auto-negotiation is enabled on a 10BASE-T port, the duplex mode of the link is automatically detected and set accordingly.

■

If auto-negotiation is disabled, the speed and duplex mode of the port is set using the Speed/Duplex listbox.

CAUTION:

The duplex mode of a link is not detected if the port on the other end of the link is not auto-negotiating. In this case, the Switch port is set to operate in half duplex:

■

If you want the link to operate in full duplex, set the Switch port to operate in full duplex using the Speed/Duplex listbox.

■

If you want the link to operate in half duplex, set the port on the other end of the link to half duplex.

Fiber ports and Transceiver Module ports are not auto-negotiating. If the port is one of these ports, the Auto-negotiation listbox is set to

Disabled

and you cannot change it.

With auto-negotiation enabled, the Speed/Duplex listbox and Full Duplex Flow Control listbox display

Auto

and cannot be set manually.

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Switch 610 and Switch 1100 only

. The 10BASE-T/100BASE-TX ports on the Switch 1100 cannot auto-negotiate IEEE802.3x flow control. Follow the instructions below to enable flow control on the Switch 1100 10BASE-T/100BASETX ports.

To enable flow control on the Switch 1100 10BASE-T/100BASE-TX ports:

From the Port Setup page, set the Auto-Negotiation listbox to disabled.

Apply

Click

Set the FD Flow Control listbox to

Configure the port to the desired speed and full duplex operation.

Click

Speed/Duplex

Apply

Enabled

100Mbps FD / 100Mbps HD / 10Mbps FD / 10Mbps HD /

Auto

If the port does not support auto-negotiation, or if auto-negotiation is disabled, this listbox allows you to:

■

Specify the speed and duplex mode of 10BASE-T/100BASE-TX ports (HD indicates half duplex, FD indicates full duplex).

■

Specify the duplex mode of 10BASE-T and 100BASE-FX ports.

If auto-negotiation is enabled, the listbox displays

Auto

and you cannot

change the speed or duplex mode of the port manually.

CAUTION:

To communicate without errors, both ends of a link must use

the same duplex mode.

Enabled / Disabled / Auto

FD Flow Control

If auto-negotiation is disabled, this listbox allows you to enable or disable the IEEE 802.3x flow control that can be used when the port is operating in full duplex. If auto-negotiation is enabled, the listbox displays

Auto

, and you cannot change the flow control setting for the port manually. Flow control prevents any packet loss that may occur on congested ports.

For IEEE 802.3x flow control to operate correctly, it must be enabled at both ends of the link.

Configuring the Current Switch 63

HD Flow Control

Enabled

/ Disabled

Allows you to enable or disable the Intelligent Flow Management flow control that can be used when the port is operating in half duplex. Flow control prevents any packet loss that may occur on congested ports.

The Half Duplex Flow Control listbox should be disabled if the port is connected to multiple devices using a hub. If it is enabled, local traffic between those multiple devices is inhibited.

802.1p Multicast Learning

Stack Default

/ Disabled

Allows you to specify whether the port uses IEEE 802.1p multicast filtering (GMRP) to filter and forward multicasts automatically:

■

Stack Default

— The port takes the 802.1p multicast learning setting from the Advanced Stack Setup page. For more information, see

“Configuring the Advanced Stack Settings”

■

Disabled

— The port does not use IEEE 802.1p multicast filtering. Use

on page 76.

this setting if the device at the other end of the link does not support IEEE 802.1p.

For more information about IEEE 802.1p multicast filtering, see

“Multicast Filtering”

on page 189.

Untagged VLAN

Allows you to specify a single VLAN to which the port belongs. For more information about VLANs, see “Virtual LANs (VLANs)”

on page 163.

If you want to move a port from the Default VLAN (VLAN 1) to another VLAN, that VLAN must have information defined for it. If you select a VLAN in the Untagged VLAN listbox that does not have information defined for it (that is, one that has the description then click the

Apply

button, the Create VLAN page is displayed allowing

Unassigned

) and you

you to enter information for that VLAN. Once you have entered the VLAN information, the Port Setup page is re-displayed and the port is placed in the VLAN. For information about the Create VLAN page, see

VLAN Information”

page 84

“Defining

If the port at the other end of the link supports VLT or 802.1Q tagging, you can specify that the port belongs to multiple VLANs. To specify that the port belongs to multiple VLANs using VLT tagging, set the VLT Tagging listbox to VLANs using 802.1Q tagging, see

page 166

Enable

. To specify that the port belongs to multiple

“Placing a Port in Multiple VLANs”

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FWD Unknown VLAN Tags

Enabled / Disabled

/ Auto

Allows you to specify whether the port forwards traffic that uses unknown IEEE 802.1Q tags. If 802.1Q VLAN learning is disabled, you can specify:

■

Enabled

— Use this setting if the port is connected to a switch that

supports IEEE 802.1Q VLANs.

■

Disabled

— Use this setting if the port is connected to an endstation, hub, bridge, router, or a switch that does not support IEEE 802.1Q VLANs.

If 802.1Q VLAN learning is enabled, you can specify:

■

Auto

— Use this setting if you want the Switch to automatically

organize the forwarding of traffic containing unknown tags.

■

Enabled

— Use this setting if the port is connected to a switch that supports IEEE 802.1Q VLANs, and you want to override the automatic organization of traffic containing unknown tags.

For more information about forwarding VLAN traffic that uses unknown tags, see “Forwarding Traffic Containing Unknown 802.1Q Tags”

page 168

Port State

Enabled

/ Disabled

Allows you to enable or disable the port (that is, turn the port on or off).

Security

Enabled

/ Disabled

Allows you to specify whether the port uses security to guard against unauthorized users connecting devices to your network. When security is enabled on a port, it enters Single Address Learning Mode. In this mode, the Switch:

■

Removes all the MAC (Ethernet) addresses stored for the port in the Switch Database.

■

Learns the address of the first packet it receives on the port.

■

Defines the address as a permanent entry.

Once the first address is learned:

■

The port is disabled if a different address is seen on the port.

■

No other address can be learned until security is disabled or the address is manually removed from the database.

■

The address cannot be learned on another port until security is disabled or the address is manually removed from the database.

Configuring the Current Switch 65

You cannot enable security on a port that is part of a resilient link, or a port that is part of a port trunk. For more information, see

Resilient Links”

page 79

“Port Trunks”

and

page 157

“Setting Up

PACE

Stack Default

/ Enabled / Disabled

Allows you to specify whether the port uses PACE (Priority Access Control Enabled) to support multimedia traffic:

■

Stack Default

— The port takes the PACE setting from the Advanced Stack Setup page. For more information, see “Configuring the

Advanced Stack Settings” on page 76.

■

Enabled

■

— Use this setting if the port is connected to:

A switch, bridge or router that does not support PACE, or has PACE disabled

An endstation that has PACE enabled

■

Disabled

■

VLT Tagging

— Use this setting if the port is connected to: A hub A switch, bridge or router that has PACE enabled An endstation that does not support PACE, or has PACE disabled

Enabled / Disabled

Allows you specify whether the port uses VLT (Virtual LAN Trunk) tagging. By specifying that the ports at both ends of a link use VLT tagging, you can create a VLT tagged link that carries traffic for all of the VLANs defined on your Switch. For more information about VLT tagging, see

“Placing a Port in Multiple VLANs”

on page 166.

VLT tagging can only be used on links to legacy 3Com devices.

A port cannot use VLT tagging if:

■

It uses 802.1Q tagging — for more information about 802.1Q tagging, see

■

It is the main or standby port of a resilient link, and the other port

“Placing a Port in Multiple VLANs”

page 166

does not use VLT tagging — for more information about resilient links,

“Setting Up Resilient Links”

see

■

It belongs to a port trunk — for more information about port trunks,

“Port Trunks”

see

page 157

page 79

You cannot disable VLT tagging if the port is part of a resilient link pair.

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Configuring the

Console Port

802.1Q VLAN Learning

Stack Default

/ Disabled

Allows you to specify whether the port uses IEEE 802.1Q learning (GVRP) to place ports in VLANs automatically:

■

Stack Default

— The port takes the 802.1Q VLAN learning setting from the Advanced Stack Setup page. For more information, see

“Configuring the Advanced Stack Settings”

■

Disable

— The port does not use IEEE 802.Q learning. Use this setting

on page 76.

if the device at the other end of the link does not support IEEE

802.1Q.

If 802.1Q VLAN learning is enabled, the settings of the FWD Unknown Tag listbox change — see the FWD Unknown Tag listbox description on

page 64

for more information.

For more information about IEEE 802.1Q VLAN learning, see “Using IEEE

802.1Q Learning” on page 167.

By default, the console port is configured for direct connection to a terminal. You only need to change this configuration if you are connecting a modem to the port. You can configure the console port of the Switch using the Console Port Configuration page.

To access the page: Click the

Click the console port on the Switch graphic. The Console Port

Configuration page is displayed as shown in Figure 12

Figure 12

Unit

icon on the side-bar.

The Console Port Configuration page

Changing the Management Settings for the Stack 67

The Console Port Configuration page contains the following elements:

Changing the Management Settings for the Stack

Console connection

Termina l

/ Modem

Allows you to specify the device that you are connecting to the console port.

Port Speed

AutoConfig

/ 1200 / 2400 / 4800 / 9600 / 19200

Allows you to specify the line speed (baud) of the console port. If you select

AutoConfig

, the line speed of the port is automatically set to the

line speed of the terminal or modem.

For the AutoConfig system to work, you need to reset the Switch.

/ Hardware RTS/CTS

Flow Control

None

Allows you to specify the serial line flow control option suitable for your terminal or modem. See the documentation accompanying your terminal or modem if you are unsure of the correct setting.

You can change the management settings for the stack using the Management Settings Pages. These pages allow you to:

■

Specify a descriptive name for the stack.

■

Change your password.

■

Specify the physical location of the stack.

Specifying a

Descriptive Name

■

Access the Getting Started pages for the stack.

■

Specify the location of the online help and documentation for the stack.

■

Specify the details of a person to contact about the stack.

You can specify a descriptive name for the stack using the System Name page.

To access the page: Click the

Click the

Management Settings System Name

shown in Figure 13

hotlink. The System Name page is displayed as

icon on the side-bar.

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Changing Your

Password

Figure 13

The System Name page

The Name field allows you to enter a descriptive name for the stack. The name can be up to 20 characters long.

You can change the password for your user using the Password Setting page.

To access the page: Click the

Click the

displayed as shown in Figure 14

Figure 14

Management Settings Password Setting

The Password Setting page

hotlink. The Password Setting page is

icon on the side-bar.

Changing the Management Settings for the Stack 69

The Password Setting page contains the following elements:

New Password

Allows you to enter a new password for your user. The password can be up to 10 characters long.

Passwords must only contain alpha-numeric characters.

Confirm Password

Allows you to re-enter the new password. The password does not change unless you enter it in this field.

Specifying a Physical

Location

Accessing the Getting

Started Pages

You can specify the physical location of the stack using the Location page.

To access the page: Click the

Click the

Figure 15

Management Settings Location

hotlink. The Location page is displayed as shown in

The Location page

icon on the side-bar.

The Getting Started pages allow you to enter basic setup information for the stack.

To access the Getting Started pages: Click the

Click the

Management Settings Getting Started

icon on the side-bar.

hotlink. The first Getting Started page, Getting

Started - Introduction, is displayed.

For information about using the Getting Started pages, see “The Getting

Started Pages” on page 46.

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Specifying the

Location of the

Online Help and

Documentation

You can specify the location of the online help and documentation for the stack using the Documentation page.

To access the page:

Click the

as shown in Figure 16

Figure 16

Management Settings Documentation

hotlink. The Documentation page is displayed

The Documentation page

icon on the side-bar.

The Documentation page contains the following elements:

Help

Allows you to specify the URL or file path of the online help for the stack. If the files are installed on your management workstation, on the CD-ROM, or on a network server, you must begin the file path with

file://

with

“Installing Online Help and Documentation”

. If the files are stored on a Web server, you must begin the URL

http://

. If you do not know where the online help is stored, see

on page 34.

Documentation

Allows you to specify the URL or file path of the online documentation for the stack. If the files are installed on your management workstation, on the CD-ROM, or on a network server, you must begin the file path with

file://

with stored, see “Installing Online Help and Documentation”

. If the files are stored on a Web server, you must begin the URL

http://

. If you do not know where the online documentation is

on page 34.

Configuring the Stack 71

Specifying Contact

Details

Configuring the Stack

You can specify the details of a person to contact about the stack using the Contact page.

To access the Contact page: Click the

Click the

Figure 17

Management Settings Contact

hotlink. The Contact page is displayed as shown in

The Contact page

icon on the side-bar.

You can configure the stack using the Configuration pages. These pages allow you to:

■

Configure the Switch Database of the stack

■

Configure the advanced settings of the stack

■

Set up resilient links for the stack

■

Set up port trunks for the stack

■

Configure VLANs for the stack

■

Set up roving analysis ports for the stack

■

Reset the Switch units in the stack

■

Initialize the Switch units in the stack

■

Upgrade the management software of the Switch units in the stack

If an existing stack with STAP enabled is powered-up with a new unit that has STAP disabled, the setting of the new unit may override the whole stack. A similar issue may also be encountered with the broadcast storm control setting. The recommended procedure to overcome this problem is to either (i) configure the new unit appropriately before adding it to the stack or (ii) reconfigure the stack appropriately immediately after power-up.

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Configuring the

Switch Database

You can configure the Switch Database of the stack using the Switch Database page.

To access the page: Click the

Click the

as shown in Figure 18

Configuration

icon on the side-bar.

Switch Database

hotlink. The Switch Database page is displayed

What is the Switch Database?

The Switch Database is used by the stack to determine if a packet should be forwarded, and which port should transmit the packet if it is to be forwarded. The database contains a list of entries, each containing three items:

■

The MAC (Ethernet) address information from each endstation that sends packets to the stack.

■

The port in the stack that receives packets from that endstation.

■

The Local ID of the VLAN to which the endstation belongs.

The number of addresses that the database can hold depends on the number of Switch units in the stack. Each unit in the Switch 1100 family provides support for 6,000 addresses, and each unit in the Switch 3300 family provides support for 12,000 addresses.

Figure 18

The Switch Database page

Databases entries can have three states:

Configuring the Stack 73

■

Learned

— The stack has placed the entry into the Switch Database

when a packet was received from an endstation:

Learned entries are removed (aged out) from the Switch Database

■

if the stack does not receive packets from that endstation within a certain period of time (the

ageing time

). This prevents the Switch Database from becoming full with obsolete entries by ensuring that when an endstation is removed from the network, its entry is also removed from the database. For information about setting the ageing time, see “Configuring the Advanced Stack Settings”

page 76

Learned entries are also removed from the Switch Database if the

■

stack is reset or powered-down.

■

Non-ageing learned

— If the ageing time is set to 0 seconds, all learned entries in the Switch Database become non-ageing learned entries. This means that they do not age, but they are still removed from the database if the stack is reset or powered-down. For information about setting the ageing time, see “Configuring the

Advanced Stack Settings” on page 76.

■

Permanent

— The entry has been placed into the Switch Database using the Switch Database page. Permanent entries are not removed from the Switch Database unless they are removed using the Switch Database page or the stack is initialized.

Displaying the Switch Database

The Display Database Entries table on the Switch Database page displays the Switch Database entries for the stack:

■

Unit

1 / 2 / 3 / 4

Displays the Switch unit in the stack that contains the port for the entry.

■

Port

Displays the port for the entry.

■

VLAN

1 ... 16

Displays the local ID of the VLAN for the entry.

■

MAC Address

Displays the MAC (Ethernet) address for the entry.

■

Status

Learned / Permanent

Displays the state of the entry.

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To display a subset of the entries for the From the

Port Filter

listbox, select a port that has submitted the relevant

current

unit:

entries or All Ports. From the

VLAN Filter

listbox, select the local ID of a VLAN associated with

the relevant entries.

In the

field, enter the first few characters of the MAC

Enter MAC Address

(Ethernet) address for the relevant entries. From the

Click the

If there are more than 100 entries in the table, click the

Select Action Type

Apply

button. The subset of entries is displayed.

listbox, select Search.

to display the next 100 entries. To search for entries in the next VLAN, select Search Next from the

Action Type

listbox.

If you search for a specific MAC address, and the address is not in the database, the Display Database Entries table displays the message

Database

To display the entire list of entries for all units in the stack: From the

Select Action Type

listbox, select Display All.

button

Select

Not in

Click the

If there are more than 100 entries in the table, click the

Apply

button. The entire list of entries is displayed.

button

to display the next 100 entries.

Inserting Permanent Entries

The Switch Database page allows you to insert permanent entries for the current unit into the Switch Database.

To insert a permanent entry: From the

From the

In the

Port Filter VLAN Filter

listbox, select a port for the entry.

listbox, select the local ID of a VLAN for the entry.

Enter MAC Address

field, enter the MAC (Ethernet) address for the

entry. From the

Click the

Select Action Type

Apply

button. The Display Database Entries table displays the

listbox, select Insert.

new entry.

Configuring the Stack 75

The Display Database Entries table is not automatically updated with the new entry. To update the table:

From the

Click the

Select Action Type

Apply

button.

listbox, select Display All.

When inserting a permanent entry, two error messages can be displayed

Status

in the

■

You can only insert an entry for one port at a time; if you select All Ports in the

■

If you enter a MAC address that has an invalid format, the message

Bad Address

column of the Display Database Entries table:

Port Filter

listbox, the message

Port Needed

is displayed.

Deleting Entries

The Switch Database page allows you to delete entries from the Switch Database.

To delete an entry:

In the

Enter MAC Address

field, enter the MAC (Ethernet) address for the

entry. From the

Click the

Select Action Type

button. The Display Database Entries table displays the

Apply

entry with the message

listbox, select Delete.

Deleted

. If the entry contained a multicast address, and the address is still stored against other ports or VLANs, the table displays

Deleted on Port

The Display Database Entries table is not automatically updated with the deletion. To update the table:

From the

Click the

Select Action Type

Apply

button.

listbox, select Display All.

You cannot delete entries that have been added by the multicast filtering systems; if you try to delete one of these entries, the Display Database Entries table displays the message information about multicast filtering, see

page 189

Cannot Delete (Multicast)

“Multicast Filtering”

. For more

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Configuring the Advanced Stack

Settings

You can configure the advanced settings of the stack using the Advanced Stack Setup page.

To access the page: Click the

Click the

is displayed as shown in Figure 19

Figure 19

Configuration Advanced Stack Setup

icon on the side-bar.

hotlink. The Advanced Stack Setup page

The Advanced Stack Setup page

The Advanced Stack Setup page contains the following elements:

Enabled / Disabled

PACE

Allows you to specify whether the ports in the stack use PACE (Priority Access Control Enabled) to support multimedia traffic. For information on specifying whether individual ports use PACE, see “Configuring a Port” on page 59

Forwarding Mode

Fast Forward / Fragment Free / Store and Forward /

Intelligent

Allows you to set the forwarding mode for units in the stack that belong to the Switch 1100/610 family:

■

Fast Forward

— Packets are forwarded as soon as the destination address is received and processed. With Fast Forward, packets take a very short time to be forwarded, but all error packets are propagated onto the network because no time is allowed for checking.

■

Fragment Free

— Packets are forwarded when at least 512 bits of the packet is received, which ensures that collision fragments are not propagated through the network. With Fragment Free, packets take a

Configuring the Stack 77

short time to be forwarded, but all error packets except fragments are propagated.

■

Store and Forward

— Received packets are buffered entirely before they are forwarded, which ensures that only good packets are forwarded to their destination. With Store and Forward, packets take slightly longer to be forwarded than with Fast Forward and Fragment Free, but no errors are propagated.

■

Intelligent

— The stack monitors the amount of error traffic on the network and changes the forwarding mode accordingly. Normally, the stack is in Fast Forward mode. If the stack detects an error rate of greater than 20 errored frames per second, the forwarding mode is set to Store and Forward. It will return to Fast Forward mode once the error rate drops to 1 errored frame per second.

Units in the Switch 3300/630 family only support the Store and Forward forwarding mode. If the stack is set to another forwarding mode, these units use the Store and Forward forwarding mode.

Spanning Tree

Enabled / Disabled

Allows you to specify whether the stack uses the Spanning Tree Protocol (STP). Using STP makes your network more resilient to link failure and also provides a protection from loops — one of the major causes of broadcast storms; for more information, see “Spanning Tree Protocol”

page 193

CAUTION:

If you enable STP, the stack takes several seconds to configure

itself. During this time, you cannot communicate with the stack.

You cannot enable STP if you have set up resilient links on any Switch units in your stack. For more information about resilient links, see

“Setting Up Resilient Links”

Broadcast Storm Control

page 79

Enabled

/ Disabled

Allows you to specify whether the stack uses Broadcast Storm Control. If Broadcast Storm Control is enabled, the stack automatically creates an alarm for each port to monitor the level of broadcast traffic on that port. If the broadcast traffic level rises to 2976 frames per second, the broadcast traffic on the port is blocked until the broadcast traffic level drops to 1488 frames per second.

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Ageing Time (Secs)

Allows you to specify the ageing time (in seconds) for all learned entries in the Switch Database of the stack; the default time is 1800 seconds (30 minutes). If you specify an ageing time of 0, the ageing process is disabled and the learned entries become non-ageing learned entries. For more information about the Switch Database, see “What is the Switch

Database?” on page 72.

60 ... 1000000

0 /

FastIP

Enabled

Disabled

/ Allows you to specify whether the stack uses FastIP to reduce the load on routing devices when there is a large amount of inter-VLAN traffic on your network. FastIP requires your stacks to support IEEE 802.1Q learning; consequently, if you set the FastIP listbox to enabled, the

802.1Q VLAN Learning listbox is also set to enabled. For more information about FastIP, see “FastIP”

CAUTION:

If you change the setting of the FastIP listbox, the stack needs

on page 181.

to be reset before the change comes into effect.

Enabled / Disabled

802.1Q VLAN Learning

Allows you to specify whether the ports in the stack use IEEE 802.1Q learning (GVRP) to place ports in VLANs automatically. For more information about IEEE 802.1Q VLAN learning, see “Using IEEE 802.1Q

Learning” on page 167.

Enabled / Disabled

802.1p Multicast Learning

Allows you to specify whether the ports in the stack use IEEE 802.1p multicast filtering (GMRP) to filter and forward multicasts automatically. For more information about IEEE 802.1p multicast filtering, see “IEEE

802.1p Multicast Filtering” on page 191.

Enabled / Disabled

IGMP Multicast Learning

Allows you to specify whether the ports in the stack use IGMP multicast filtering to filter and forward multicasts automatically. For more information about IGMP multicast filtering, see “IGMP Multicast

Filtering” on page 192.

Configuring the Stack 79

Setting Up Resilient

Links

You can set up resilient links for the stack using the Resilient Links page.

To access the page: Click the

Click the

Configuration Resilient Links

shown in Figure 20

Figure 20

The Resilient Links page

icon on the side-bar. hotlink. The Resilient Links page is displayed as

What are Resilient Links?

The Resilient Link feature enables you to protect critical links and prevent network downtime if those links fail. A resilient link is comprised of a

resilient link pair

containing a main link and a standby link. If the main link fails, the standby link immediately and automatically takes over the task of the main link.

The resilient link pair is defined by specifying a main port and a standby port at one end of the link.

During normal operation, the main port is enabled and the standby port is disabled. If the main link fails, the main port is disabled and the standby port is enabled. If the main link becomes operational, you can then re-enable the main port and disable the standby port again.

When setting up resilient links, note the following:

■

Resilient link pairs cannot be set up if the stack uses the Spanning Tree Protocol (STP).

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■

Resilient link pairs can only be set up using fiber or twisted pair ports. The main and standby ports in the same pair, however, can use any combination of these media.

■

A resilient link pair must only be defined at one end of the link.

■

A resilient link pair must only be set up if:

The ports belong to the same VLANs.

■

The ports use the same VLAN tagging system (802.1Q tagging or

■

VLT tagging). The ports have the same IEEE 802.1Q VLAN learning setting.

■

The ports have the same IEEE 802.1p multicast learning setting.

■

Neither of the ports are secure ports (have security enabled).

■

Neither of the ports are part of a port trunk.

■

Neither of the ports belong to another resilient link pair.

■

The port state of ports in a resilient link pair cannot be changed unless a link failure occurs.

Displaying Resilient Link Pairs

The Resilient Links page displays the resilient link pairs that are set up for the stack:

■

Main Link

Unit 1 Port 1 / Unit 1 Port 2 / ...

Displays the port in the stack that is the main port of the resilient link pair, and the state of the link on that port.

■

Standby Link

Unit 1 Port 1 / Unit 1 Port 2 / ...

Displays the port in the stack that is the standby port of the resilient link pair, and the state of the link on that port.

■

Pair State

Operational / Not Operational

Displays whether the resilient link pair is operational or not. When the pair is operational, either the main port or the standby port can forward traffic.

Creating a Resilient Link Pair

The Resilient Links page allows you to create a resilient link pair. To do this:

Click the

Select the Switch units that are to contain the main port and standby port

Add...

button. The first Add Resilient Links page is displayed.

of the resilient link pair.

Configuring the Stack 81

Click the

From the

Click the

From the

button.

Next...

Main Link

Next...

field, select the main port of the resilient link pair.

button.

Standby Link

field, select the standby port of the resilient link

pair. Click the

button. The Resilient Links page is displayed showing the

Next...

new resilient link pair.

Deleting a Resilient Link Pair

The Resilient Links page allows you to delete a resilient link pair. To do this:

Click the resilient link pair.

Click the

Delete

button.

Swapping the Active Port of a Resilient Link Pair

The Resilient Links page allows you to swap the active (or enabled) port of a resilient link pair. To do this:

Click the resilient link pair.

Click the

Swap

button.

Setting Up Port

Trunks

You can set up port trunks for the stack using the Port Trunk Setup page.

To access the page: Click the

Click the

Configuration Port Trunks

shown in Figure 21

icon on the side-bar.

hotlink. The Port Trunks Setup page is displayed as

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Figure 21

The Port Trunk Setup page

What are Port Trunks?

Port trunks are connections that allow devices to communicate using up to four links in parallel. Port trunks provide two benefits:

■

They can potentially double, triple or quadruple the bandwidth of a connection.

■

They can provide redundancy — if one link is broken, the other links share the traffic for that link.

For more information, see “Port Trunks”

on page 157.

Displaying the Ports that Belong to Each Port Trunk

The Port Trunks Setup page allows you to display the ports that belong to each port trunk. To do this:

From the

Click the

are available to be placed in the port trunk. The

Port Trunks Available

Select

button. The

listbox, select a port trunk.

Available Ports

listbox displays the ports that

Trunk Members

listbox

displays the ports that belong to the port trunk.

Placing Ports in a Port Trunk

The Port Trunks Setup page allows you to place ports in port trunks. To do this:

From the

Click the

Port Trunks Available

Select

button.

listbox, select a port trunk.

Configuring the Stack 83

Configuring VLANs

Click a port in the

Click the

Add >>

port is displayed in the

Available Ports

button. The port is assigned to the port trunk, and the

Trunk Mem be rs

listbox.

There are several conditions that need to be satisfied before a port can be placed in a port trunk. See

To place a port back in the

Trunk Members

listbox and click the

“Port Trunks and Your Switch”

Available Ports

listbox, click the port in the

<< Remove

(primary) port cannot be placed back in the

button. The first

Available Ports

page 158

listbox until

the other ports are placed back.

You can configure VLANs for the stack using the VLAN Setup page.

To access the page: Click the

Click the

Figure 22

Configuration

hotlink. The VLAN Setup page is displayed as shown in

VLANs

The VLAN Setup page

icon on the side-bar.

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What are VLANs?

A VLAN is a flexible group of devices that can be located anywhere in a network, but they communicate as if they are on the same physical segment. With VLANs, you can segment your network without being restricted by physical connections — a drawback of traditional network design. For more information about VLANs, see “Virtual LANs (VLANs)” on page 163

Defining VLAN Information

The VLAN Setup page allows you to define the required information about VLANs. To do this:

Click the

In the

Create...

VLAN Name

button. The Create VLAN page is displayed.

field, enter a descriptive name for the VLAN (for example, Marketing or Management). The name can be up to 32 characters long.

In the

field, enter a unique 802.1Q ID for the VLAN. The

802.1Q VLAN ID

802.1Q ID is used to identify the VLAN if you use 802.1Q tagging across your network, and can be any number between 2 and 4094. You only need to enter an ID in the 802.1Q VLAN ID field if you intend to use

802.1Q tagging on your network.

In the

listbox, enter a local ID for the VLAN. The local ID is used to

Local ID

identify the VLAN within the stack, and can be any number between 2 and 16 (VLAN 1, the Default VLAN, is already created and cannot be deleted). The Local ID corresponds to the VLAN IDs used in legacy 3Com devices.

Click

. The VLAN information is defined, and the VLAN Setup page

Apply

is displayed showing the port membership for the new VLAN.

Editing VLAN Information

The VLAN Setup page allows you to edit any VLAN information. To do this:

From the

VLANs Available

listbox, select a VLAN.

Click the

Edit the required information.

Click

Select

button.

Edit...

button. The Edit VLAN page is displayed.

Apply

. The VLAN information is edited, and the VLAN Setup page is

displayed.

Configuring the Stack 85

You cannot edit the 802.1Q VLAN ID if ports are already assigned to the VLAN.

Deleting VLAN Information

The VLAN Setup page allows you to delete any VLAN information that you define in the Create VLAN page. To do this:

From the

Click the

VLANs Available

button.

Select

button. The VLAN is deleted, and the VLAN Setup page

Delete

listbox, select a VLAN.

displays the port membership of the Default VLAN.

You cannot delete the information for a VLAN if ports are assigned to that VLAN.

Displaying the Ports that Belong to Each VLAN

The VLAN Setup page allows you to display the ports that belong to each VLAN. To do this:

From the

Click the

VLANs Available

button. The

Select

the stack that are available to be placed in the VLAN. The

listbox, select a VLAN.

Available Ports

listbox displays the ports in

VLAN Members

listbox displays the ports in the stack that belong to the VLAN.

Placing Ports in Single VLANs

To place a port in a single VLAN, use the Untagged VLAN listbox on the Port Setup page; see “Configuring a Port”

on page 59.

Placing Ports in Multiple VLANs Using VLT Tagging

To place a port in multiple VLANs using VLT tagging, use the VLT Tagging listbox on the Port Setup page; see “Configuring a Port”

on page 59.

Placing Ports in Multiple VLANs Using 802.1Q Tagging

The VLAN Setup page allows you to place a port in multiple VLANs using

802.1Q tagging. To do this: From the

Click the

Click the relevant port in the

Click the

is displayed in the

VLANs Available

button.

Select

Add >>

button. The port is assigned to the VLAN, and the port

VLAN Members

listbox, select a VLAN.

Available Ports

listbox.

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To place the port in another VLAN, repeat steps 1 to 4 with that VLAN.

Setting Up Roving

Analysis Ports

To place a port back in the

Available Ports

VLAN Members listbox and click the

The

VLAN Members

listbox displays two types of port that do not use

listbox, click the port in the

<< Remove

button.

802.1Q tagging: untagged ports and VLT tagged ports. These ports cannot be moved from the VLAN using the VLAN Setup page:

■

To remove an untagged port from a VLAN, change its VLAN allocation using the

■

VLT tagged ports belong to all VLANs. To remove a VLT tagged port

Untagged VLAN

listbox on the Port Setup page.

from a VLAN, specify that the port is no longer VLT tagged using the

VLT Tagging

listbox on the Port Setup page.

You can set up roving analysis ports for the stack using the Roving Analysis Setup page.

To access the page: Click the

Click the

displayed as shown in Figure 23

Figure 23

Configuration Roving Analysis

icon on the side-bar.

hotlink. The Roving Analysis Setup page is

The Roving Analysis Setup page

Configuring the Stack 87

What is Roving Analysis?

Roving analysis is a system that allows you to attach a network analyzer to one port and use it to monitor the traffic of other ports in the stack. The system works by enabling you to define an analysis port (the port that is connected to the analyzer), and a monitor port (the port that is to be monitored). Once the pair are defined, and you enable the system, the stack takes all the traffic going in and out of the monitor port and copies it to the analysis port.

Roving analysis is used when you need the functions of a network analyzer, but do not want to change the physical characteristics of the monitored segment by attaching an analyzer to that segment.

Defining Monitor Ports and Analysis Ports

The Roving Analysis Setup page allows you to define monitor ports and analysis ports.

To define a monitor port and analysis port: Click a port in the

Available Monitor Ports

listbox to specify the monitor

port. Click a port in the

Available Analysis Ports

listbox to specify the analysis

port. Click

CAUTION:

Apply

The analysis port should have a higher bandwidth than the monitor port. Otherwise, the roving analysis system cannot copy all the traffic effectively.

If a port belongs to a port trunk, you cannot specify that it is a monitor port or an analysis port. Consequently, it is not displayed in the

Monitor Ports

listbox or the

Available Analysis Ports

listbox.

Available

An analysis port must be in the same VLANs as the monitor port it is copying. We therefore recommend that you manually place your analysis ports in all the VLANs used by the stack.

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Enabling the Roving Analysis System

The Roving Analysis Setup page allows you to enable the roving analysis system. To do this:

Resetting All the

Units in the Stack

From the

Click

Roving Analysis State

Apply

listbox, select

Enabled

You can reset all the Switch units in the stack using the Reset page.

To access the page: Click the

Click the

To reset the stack, select

Configuration Reset

hotlink. The Reset page is displayed.

icon on the side-bar.

Yes

and then click

Apply

What Happens During a Reset?

Resetting the Switch units in the stack simulates a power-off/on cycle. You may want to do this if you need to:

■

Remove all the Learned entries in the Switch Database (SDB).

■

Reset the statistic counters of the stack.

CAUTION:

Resetting the stack causes some of the traffic being transmitted over the network to be lost. It also clears all Learned entries from the Switch Database.

The stack takes about 10 seconds to reset. While the stack is resetting, you cannot communicate with it.

Initializing All the

Units in the Stack

You can initialize all the Switch units in the stack using the Initialize page.

To access the page: Click the

Click the

To initialize the stack, select

Configuration Initialize

hotlink. The Initialize page is displayed.

icon on the side-bar.

Yes

and then click

Apply

What Happens During an Initialization?

Initializing the Switch units in the stack returns them to their default (factory) settings. The only information that does not return to its default

Configuring the Stack 89

setting is the IP and SLIP information, which is retained to ensure that you can continue managing the stack. You may want to initialize the stack if it has previously been used in a different part of your network, and its settings are incorrect for the new environment.

Upgrading

Management

Software

CAUTION:

Use great care when initializing the stack — it removes all

configuration information, including password and security information.

CAUTION:

When initializing the stack, network loops may occur if you have set up port trunks, resilient links, VLANs, or the Spanning Tree Protocol. Before initializing the stack, ensure you have disconnected the cabling for all standby or duplicate links.

The stack takes about 10 seconds to initialize. While the stack is initializing, you cannot communicate with it.

You can upgrade the management software of all Switch units in the stack using the Software Upgrade page.

To access the page: Click the

Click the

Configuration Software Upgrade

displayed as shown in Figure 24

Figure 24

The Software Upgrade page

icon on the side-bar.

hotlink. The Software Upgrade page is

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To upgrade the management software: Copy the software upgrade file into an appropriate directory on a TFTP

server. For information on using a TFTP Server, see the documentation that accompanies it.

CAUTION:

You must ensure that the port connected to the TFTP server has 802.1Q VLAN learning disabled and belongs to the Default VLAN (VLAN 1). The server can only upgrade a stack if it is connected to the stack by the Default VLAN.

You can download a TFTP server called 3CServer (filename: 3cs117.zip) from 3Com’s website

http://www.3com.com

. 3CServer can be installed

and run on a Microsoft Windows® 95/98 or NT system.

Enter the name of the software upgrade file in the

Filename

field. The

filename format is:

s2sxx_yy.bin

where

CAUTION:

xx_yy

is the version of management software.

You must use the

s2sxx_yy.bin

format, otherwise the

upgrade fails.

Enter the IP address of the TFTP server in the

Click the

Apply

button. During the upgrade, the Power/Self Test LED

Server Address

field.

flashes green and the command line interface is locked. The units in the stack upgrade one at a time, and each unit takes about 5 minutes; when the upgrade is complete, the Switch units in the stack are reset.

CAUTION:

During the upgrade, do not power-down or reset any Switch units in the stack.

Displaying Statistics for the Current Switch 91

Displaying Statistics for the Current Switch

Displaying Unit

Statistics

You can display statistics for the current Switch in the stack using the Health pages. These pages allow you to:

■

Display a range of statistics for all the ports on the Switch

■

Display a range of statistics for a specific port on the Switch

You can display a range of statistics for all the ports on the Switch using the Unit Graph page.

To access the page: Click the

Click the

icon on the side-bar.

Health Unit Graph

hotlink. The Unit Graph page is displayed.

The graphs that can be displayed by the Unit Graph page are shown in

Figure 25

The graphs displayed by the Unit Graph page

You can choose to display graphs for

Errors

To display the Bandwidth Utilization graph: From the listbox, choose

1 2

Click

Apply

Bandwidth Utilization

Bandwidth Utilization or Tot a l

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To display the Total Errors graph: From the listbox, choose

Apply

Click

Total Errors

If you click a port on the Bandwidth Utilization or Total Errors graph, the graph for that port is displayed.

Interpreting the Statistics

■

The Bandwidth Utilization graph scales automatically to display the percentage of bandwidth used on all ports of the Switch over the last 30 seconds:

A bandwidth utilization of 0–25% (green bar on the graph)

■

indicates that the ports are dealing with a light traffic load. A bandwidth utilization of 26–85% (yellow bar on the graph)

■

indicates that the ports are dealing with a normal traffic load. A bandwidth utilization of 86–100% (red bar on the graph)

■

indicates that the ports are dealing with a heavy traffic load. This could be caused by a fault in your network, or an inadequate network configuration.

■

The Total Errors graph scales automatically to display the total number of packets with errors that have been seen on the ports of the Switch over the last 30 seconds.

Displaying Port

Statistics

You can display a range of statistics for a specific port on the Switch using the Port Graph page.

To access the page: Click the

Click the

Health

icon on the side-bar.

Port Graph

hotlink. The Port Graph page is displayed.

The graphs that can be displayed by the Port Graph page are shown in

Figure 26

Displaying Statistics for the Current Switch 93

Figure 26

The graphs displayed by the Port Graph page

You can choose to display graphs for

Size distribution

To display the Utilization graph:

From the first listbox, choose a port.

From the second listbox, choose Click

Apply

To display the Total Errors graph:

From the first listbox, choose a port.

From the second listbox, choose Click

Apply

Utilization, Total Errors

Utilization

Total Errors

Packet

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To display the Packet Size Distribution graph: From the first listbox, choose a port.

From the second listbox, choose

Apply

Click

Packet Size Distribution

Interpreting the Statistics

■

The Utilization graph scales automatically to display the percentage of bandwidth used on the port over the last hour and last 48 hours:

A bandwidth utilization of 0–25% indicates that the port is dealing

■

with a light traffic load. A bandwidth utilization of 26–85% indicates that the port is

■

dealing with a normal traffic load. A bandwidth utilization of 86–100% indicates that the port is

■

dealing with a heavy traffic load. This could be caused by a fault in your network, or an inadequate network configuration.

■

The Total Errors graph scales automatically to display the total number of packets with errors that have been seen on the port over the last hour and last 48 hours.

■

The Packet Size Distribution graph displays the proportion of packets of certain sizes seen by the port over the last 30 seconds.

ORKING

ITH THE

OMMAND

INE INTERFACE

This chapter describes how to access and use the command line interface. It covers the following topics:

■

Accessing the Interface

■

About the Interface Menus

■

A Quick Guide to the Commands

■

Displaying and Changing Bridging/VLANs Information

■

Displaying and Changing Port Information

■

Displaying and Changing System Feature Information

■

Displaying and Changing IP-related Information

■

Displaying and Changing SNMP-related Information

■

Displaying and Changing Stack Information

Throughout this chapter, the term stack refers to a number of Switch units that are managed as a single unit. However, a stack can contain a single Switch.

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Accessing the Interface

To access the command line interface, take the following steps:

Set up your network for command line interface management; for more

information, see “Setting Up Command Line Interface Management”

page 36

. The login sequence for the command line interface begins as soon as a relevant Switch in the stack detects a connection to its console port, or as soon as a Telnet session is started.

If the login sequence does not begin immediately, press the [Return] key a few times until it does begin. If the sequence still does not begin, see

“Solving Command Line Interface Problems”

At the login and password prompts, enter your user name and password.

■

If you have been assigned a user name and password, enter those

page 216

details.

■

If you are accessing the command line interface for the first time, enter a default user name and password to match your access requirements. The defaults are described in “Logging in as a Default

User” on page 39. If you are setting up the stack for management, we

suggest that you log in as

admin

(which has no default password).

If you have logged on correctly, the top-level menu of the command line interface is displayed as described in “About the Interface Menus”

page 97

password.

. If you have not logged on correctly, the message

is displayed and the login sequence starts again.

Incorrect

Exiting the Interface

To prevent unauthorized configuration of the stack, we recommend that you change the default passwords as soon as possible. To do this using the command line interface, you need to log in as each default user and then follow the steps described in “Changing Your Password”

page 147

You may experience a slow CLI response if differing community strings are configured for units in a stack. You should ensure that all units in a stack are configured with matching community strings.

You can exit the command line interface at any time; to do this, enter the command

logout

from the top level of the command line interface. If there is a period if inactivity lasting longer than 30 minutes, you exit from the command line interface automatically. After the exit, the first key that you press returns you to the login sequence.

About the Interface Menus 97

How Many Users Can

Access the Interface?

About the Interface Menus

The command line interface can be accessed by several users at the same time:

■

If the stack contains multiple Switch units, the command line interface can be accessed through each console port in the stack at the same time.

■

If the stack is being managed using Telnet, the command line interface can be accessed by any number of users at the same time.

Once you access the command line interface, the Top-level menu is displayed as shown in Figure 27

Figure 27

Top-level menu

The command line interface is made up of two areas:

■

The Menu Area

— Contains the current menu of commands. The menu can contain commands to configure the stack or commands to display other menus in the command line interface. Each command is accompanied by a brief description of its purpose.

■

The Command Area

— Contains a

Select menu option

prompt

where you can enter the commands displayed in the menu area.

From the Top-level menu, you can access six sub-menus:

■

Bridge menu

This menu contains commands that allow you to administer the bridging functions of the Switch, such as STP, multicast filtering, and VLANs.

■

Ethernet menu

This menu contains commands that allow you to enable or disable the ports in the stack, and view status information about them.

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■

Feature menu

This menu contains commands that allow you to configure Roving Analysis Port, enable or disable Broadcast Storm Control, set up or remove resilient links, and configure Trunks on the Switch.

■

IP menu

This menu contains commands that allow you to view and change IP-related information for the stack and ping other devices in your network. It also allows you to reset the IP configuration back to factory defaults.

■

SNMP menu

This menu contains commands that allow you to view and change SNMP-related information for the stack.

■

System menu

This menu contains commands that allow you to view and configure information about the Switch units in the stack or the stack as a whole.

About the Interface Menus 99

Figure 28

Command line interface menu structure

Entering Commands

The command area of the command line interface contains a

menu option

prompt that allows you to enter the commands in the

menu area

Commands are not case-sensitive.

■

To enter a simple command:

At the prompt, enter the name of the command.

Select

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■

To enter multiple commands:

At the prompt, enter each command in succession. For example, to display the system menu and reset the Switch units in the stack, enter:

system reset

■

To enter commands that require values:

Append the values to the name of the command. For example, to display the system menu and change your password, enter:

system password <password>

If you do not specify values for a command that requires them, you are prompted to enter the values. At each prompt, the default value is displayed in brackets.

■

To enter abbreviated commands

At the prompt, enter enough characters to uniquely identify the commands. For example, to display the system menu and then change the password for your user, enter:

sy pa <password>

Displaying Menus

Obtaining Help

There are several ways to display the menus in the command line interface menu structure:

■

To display sub-menus:

At the Select menu option prompt, enter the name of the menu or menus.

■

To display parent menus:

At the Select menu option prompt, enter

■

To display the Top-level menu:

Press the [Esc] key.

You can access the command line interface help system at any time by

entering

at the Select menu option prompt.

3Com 1100 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Conventions

Related Documentation

Year 2000 Compliance

Documentation Comments

Product Registration

What is Management Software?

Summary of Software Features

Software Features Explained

Stack Management

Forwarding Modes

Duplex Modes

Flow Control

Traffic Prioritization

PACE

Security

Resilient Links

Port Trunks

Virtual LANs

FastIP

Multicast Filtering

RMON

Roving Analysis

Management

Default Settings

Methods of Managing a Switch

Setting Up Web Interface Management

Choosing a Browser

Setting Up Command Line Interface Management

Setting Up SNMP Management

Managing a Switch Over the Network

IP Addresses

Logging in as a Default User

Accessing the Web Interface

The Getting Started Pages

The Main Web Interface

The Page Area

Configuring the Current Switch

Configuring a Port

Changing the Management Settings for the Stack

Configuring the Stack

Configuring VLANs

Displaying Statistics for the Current Switch

Accessing the Interface

Exiting the Interface

About the Interface Menus

Entering Commands

Displaying Menus

Obtaining Help