3com 3C17203 User Manual

SuperStack® 3

Switch 4400 Series Getting Started Guide

Switch 4400 (3C17203) Switch 4400 (3C17204) Switch 4400 PWR (3C17205) Switch 4400 SE (3C17206) Switch 4400 FX (3C17210)

http://www.3com.com/

Part No. DUA1720-3AAA06 Published June 2003

3Com Corporation 5500 Great America Parkway, Santa Clara, California 95052-8145

Copyright © 2003, 3Com Corporation. All rights reserved. No part of this documentation may be reproduced in any form or by any means or used to make any derivative work (such as translation, transformation, or adaptation) without written permission from 3Com Corporation.

3Com Corporation reserves the right to revise this documentation and to make changes in content from time to time without obligation on the part of 3Com Corporation to provide notification of such revision or change.

3Com Corporation provides this documentation without warranty, term, or condition of any kind, either implied or expressed, including, but not limited to, the implied warranties, terms or conditions of merchantability, satisfactory quality, and fitness for a particular purpose. 3Com may make improvements or changes in the product(s) and/or the program(s) described in this documentation at any time.

If there is any software on removable media described in this documentation, it is furnished under a license agreement included with the product as a separate document, in the hard copy documentation, or on the removable media in a directory file named LICENSE.TXT or !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.

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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.

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CONTENTS

ABOUT THIS GUIDE

Before You Start 7

Release Notes 7

About Your CD-ROM 8 Conventions 8 Related Documentation 9

Accessing Online Documentation 10 Documentation Comments 10 Product Registration 11

1 INTRODUCING THE

UPERSTACK 3 SWITCH 4400

About the Switch 4400 14

Summary of Hardware Features 14 Switch 4400 — Front View Detail 15

10BASE-T/ 100BASE-TX Ports 16

100BASE-FX Ports 16

LEDs 17 Switch 4400 — Rear View Detail 19

Power Socket 19

Redundant Power System Socket 19

Console Port 19

Expansion Module Slots 19 Default Settings 20

2 INSTALLING THE SWITCH

Package Contents 24 Choosing a Suitable Site 24 Rack-mounting 25 Placing Units On Top of Each Other 27 Stacking Units 27

How To Stack Units 27 Rules For Stacking Units 29

The Power-up Sequence 30

Powering-up the Switch 4400 30 Checking for Correct Operation of LEDs 30 Connecting a Redundant Power System 30 Using Power over Ethernet 31 Choosing the Correct Cables (Switch 4400, 4400 SE and

4400 PWR) 32 Choosing the Correct Cables (Switch 4400 FX) 33

3 SETTING UP FOR MANAGEMENT

Setting Up Overview 36

IP Configuration 37 Preparing for Management 38

Manually Configuring IP Information 39

Connecting to a Front Panel Port 39 Connecting to the Console Port 42

Viewing Automatically Configured IP Information 46

Using 3Com Network Supervisor 46 Connecting to the Console Port 46

Methods of Managing a Switch 49

Command Line Interface Management 49 Web Interface Management 50 SNMP Management 50

Setting Up Command Line Interface Management 50

CLI Management via the Console Port 50 CLI Management over the Network 51

Setting Up Web Interface Management 52

Pre-requisites 52 Web Management Over the Network 53

Setting Up SNMP Management 53

Pre-requisites 53

Default Users and Passwords 54

Changing Default Passwords 54

4 PROBLEM SOLVING

Solving Problems Indicated by LEDs 56 Solving Hardware Problems 57 Solving Communication Problems 60 Solving Software Upgrade Problems 61

A SAFETY INFORMATION

Power Cord Set — Japan 63 Important Safety Information 64 L’information de Sécurité Importante 66 Wichtige Sicherheitsinformationen 68

B PIN-OUTS

Null Modem Cable 71 PC-AT Serial Cable 71 Modem Cable 72 RJ-45 Pin Assignments 72

C TECHNICAL SPECIFICATIONS

Switch 4400 (24-port) and Switch 4400 SE 75 Switch 4400 PWR (24-port) 77 Switch 4400 (48-port) 78 Switch 4400 FX 79

D TECHNICAL SUPPORT

Online Technical Services 81

World Wide Web Site 81

3Com Knowledgebase Web Services 82

3Com FTP Site 82 Support from Your Network Supplier 82 Support from 3Com 83

Internet Support 83

Telephone Support 83 Returning Products for Repair 85

Contacting 3Com Support 86

INDEX

REGULATORY NOTICES

ABOUT THIS GUIDE

This guide provides all the information you need to install and use the following switches in their default state:

■ SuperStack® Switch 4400 (3C17203)

■ SuperStack® Switch 4400 (3C17204)

■ SuperStack® Switch 4400 PWR (3C17205)

■ SuperStack® Switch 4400 SE (3C17206)

■ SuperStack® Switch 4400 FX (3C17210)

All procedures described in this guide apply to all models except where stated.

The guide is intended for use by network administrators who are responsible for installing and setting up network equipment; consequently, it assumes a basic working knowledge of LANs (Local Area Networks).

Before You Start This section contains information about the documents and CD-ROM

that accompany your Switch 4400.

Release Notes The Release Notes provide important information about the current

software release, including new features, modifications, and known problems. You should read the Release Notes before installing the Switch in your network.

If the information in the Release Notes differ from the information in this guide, follow the instructions in the Release Notes.

8 ABOUT THIS GUIDE

About Your CD-ROM The CD-ROM contains the following:

■ Online documentation for the Switch 4400 — refer to Related

Documentation on page 9 for details.

■ 3Com Network Supervisor — a powerful and easy-to-use network

management platform.

■ A number of other useful applications.

Most user guides and release notes are available in Adobe Acrobat Reader Portable Document Format (PDF) or HTML on the 3Com World Wide Web site:

http://www.3com.com/

Conventions Table 1 and Table 2 list conventions that are used throughout this guide.

Tab le 1 Notice Icons

Icon Notice Type Description

Information note Information that describes important features or

Caution Information that alerts you to potential loss of data or

Warning Information that alerts you to potential personal injury

instructions

potential damage to an application, system, or device

Tab le 2 Text Conventions

Convention Description

Screen displays This typeface represents information as it appears on the

Syntax The word “syntax” means that you must evaluate the syntax

Commands The word “command” means that you must enter the

screen.

provided and then supply the appropriate values for the placeholders that appear in angle brackets. Example:

To change your password, use the following syntax:

system password <password>

In this example, you must supply a password for <password>.

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

Documentation Comments

To access the documentation on the CD-ROM supplied with your Switch, do the following:

1 Insert the CD-ROM into your CD-ROM drive. If your PC has auto-run

enabled, a splash screen will be displayed automatically.

2 Select the Documentation section from the contents page.

If the online documentation is to be accessed from a local drive or server, you will need to access the CD-ROM contents via the root directory and copy the files from the CD-ROM to a suitable directory.

■ The HTML Reference Guide is stored in the Docs/reference

directory on the CD-ROM. The documentation is accessed using the contents.htm file.

■ The PDF Implementation Guide is stored in the

Docs/implementation directory of the CD-ROM.

3Com recommends that you copy the Docs/reference directory as a whole to maintain the structure of the files.

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

Product Registration 11

■ Document part number (on the title page)

■ Page number (if appropriate)

Example: Part Number DUA1720-3AAA06

SuperStack 3 Switch 4400 Series Getting Started Guide Page 21

Please note that we can only respond to comments and questions about 3Com product documentation at this e-mail address. Questions related to technical support or sales should be directed in the first instance to your network supplier.

Product Registration

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

http://www.3com.com/register

12 ABOUT THIS GUIDE

INTRODUCING THE SUPERSTACK 3 SWITCH 4400

This chapter contains introductory information about the Switch 4400 and how it can be used in your network. It covers summaries of hardware and software features and also the following topics:

■ About the Switch 4400

■ Switch 4400 — Front View Detail

■ Switch 4400 — Rear View Detail

■ Default Settings

14 CHAPTER 1: INTRODUCING THE SUPERSTACK 3 SWITCH 4400

About the Switch 4400

Summary of

Hardware Features

The Switch 4400 is a stackable 10/100 Mbps Ethernet switch and provides high-performance workgroups with a backbone to server connection. The Switch 4400 allows Cascade, Gigabit Ethernet or Fast Ethernet Fiber connections when expansion modules are installed in the expansion slots on the rear of the unit. You can also add the Switch 4400

to any SuperStack

system as your network grows.

The Switch 4400 PWR (3C17205) supports Power over Ethernet on all front panel ports. If you plug in a compatible (IEEE 802.3af compliant) device, it will be automatically detected and power supplied to it. Power over Ethernet is enabled on each port by default.

The Switch 4400 FX (3C17210) has 24 100BASE-FX MT-RJ ports. These allow easy connection of 100 Mbps fiber-optic links.

Table 3 summarizes the hardware features that are supported by the Switch 4400.

Tab le 3 Hardware features

Feature Switch 4400 Addresses ■ Up to 8000 supported

■ Up to 64 permanent entries

Auto-negotiation ■ Supported on all ports

■ Auto MDI/MDI-X (not 3C17210)

Forwarding Modes Store and Forward Duplex Modes Half and full duplex on all front panel ports Flow Control In full duplex operation all ports are supported Smart Auto-sensing Supported on all ports Traffic Prioritization Supported (using the IEEE Std 802.ID, 1998 Edition):

Power over Ethernet Supported on all front panel ports (3C17205 only). Ethernet and Fast Ethernet

Ports RPS Support Connects to SuperStack 3 Advanced Redundant

Mounting 19-inch rack or stand-alone mounting Stacking All Switch units in the stack can be managed as a

4 queues per port

Auto-negotiating 10BASE-T/100BASE-TX ports or 100BASE-FX ports (3C17210)

Power System (ARPS) (3C16071B)

single entity with one IP address

Switch 4400 — Front View Detail 15

Switch 4400 — Front View Detail

Figure 1 Switch 4400 FX — front view

Figure 2 Switch 4400 (24-port) / Switch 4400 SE — front view

Figure 3 Switch 4400 PWR — front view

16 CHAPTER 1: INTRODUCING THE SUPERSTACK 3 SWITCH 4400

Figure 4 Switch 4400 (48-port) — front view

WARNING: RJ-45 Ports. These are shielded RJ-45 data sockets. They cannot be used as standard traditional telephone sockets, or to connect the unit to a traditional PBX or public telephone network. Only connect RJ-45 data connectors, network telephony systems, or network telephones to these sockets.

Either shielded or unshielded data cables with shielded or unshielded jacks can be connected to these data sockets.

10BASE-T/

100BASE-TX Ports

The Switch 4400, 4400 SE and 4400 PWR have 24 or 48 auto-negotiating 10BASE-T/100BASE-TX ports configured as Auto MDIX (cross-over). These ports automatically provide the appropriate connection. Alternatively, you can manually set these ports to 10BASE-T half duplex, 10BASE-T full duplex, 100BASE-TX half duplex or 100BASE-TX full duplex. The maximum segment length is 100 m (328 ft) over Category 5 twisted pair cable.

The 4400 PWR will supply up to 15.4W of power through any of the 24 front panel ports in conformance to the 802.3af specification. The Switch 4400 PWR incorporates a LED Mode Button on the front panel, which when pressed changes the mode of the front panel port LEDs functionality between Switch and Power mode.

100BASE-FX Ports The Switch 4400 FX has 24 100BASE-FX MT-RJ ports. These are

100 Mbps fiber-optic ports that can use standard multi-mode fiber-optic cable of up to 2 kilometers (1.2 miles). They use the standard MT-RJ

Switch 4400 — Front View Detail 17

connector that allows both the transmit and the receive fibers to be connected in the same space as an RJ-45 port.

LEDs Table 4 lists LEDs visible on the front of the Switch, and how to read their

status according to color. For information on using the LEDs for problem solving, see “Solving Problems Indicated by LEDs” on page 56.

Tab le 4 LED behavior

LED Color Indicates Power/Self Test LED

Green The Switch is powered-up and operating normally. Green flashing The Switch is either downloading software or is initializing

(which includes running a Power On Self Test).

Yellow The Switch has failed its Power On Self Test

or A port has failed and has been automatically disabled. You

can verify this by checking that the Port LED Status LED is quickly flashing Yellow. If a port fails the Switch passes its Power On Self Test and continues to operate normally.

Off The Switch is not receiving power or there is a fault with the

Port LEDs

Packet Green Full duplex packets are being transmitted/received on the

Yellow Half duplex packets are being transmitted/received on the

Off No packets are being transmitted/received on the port.

Status Green A high speed (100 Mbps) link is present, and the port is

Green flashing A high speed (100 Mbps) link is present, but the port is

Yellow A low speed (10 Mbps) link is present, and the port is

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

Yellow flashing (fast)

Off No link is present.

Power Supply Unit.

port.

enabled.

disabled.

enabled (not 4400 FX).

disabled (not 4400 FX). The port has failed and has been automatically disabled. The

Switch passes its Power On Self Test and continues to operate normally even if one or more ports are disabled.

18 CHAPTER 1: INTRODUCING THE SUPERSTACK 3 SWITCH 4400

LED Color Indicates Port LEDs — Power over Ethernet mode (3C17205 only)

Packet Green Power is being delivered to the port.

Green flashing Exceeded port power limit (overCurrent MIB state) or unable

to supply power due to unit over budget (denyLowPriority

MIB state). Yellow Power over Ethernet error, no power supplied on port. Off No power is being delivered.

Status Yellow flashing Power over Ethernet POST error on port. Flash rate is 4 Hz

Module LEDs

Packet Refer to the user documentation accompanying the module,

Status Refer to the user documentation accompanying the module,

Off There is no module installed in the expansion module slot. Yellow flashing

(fast)

Unit LEDs

1–8 Green When the Switch forms a stack with other Switch 4400

Green sequential

Green flashing

Off A fault has occurred.

Port LED Status LED (3C17205 only)

Green Port LEDs are operating in power mode Yellow flashing Port LEDs are operating in normal mode. One or more ports

Off Port LEDs are operating in normal mode.

if installed.

The module has failed and has been automatically disabled.

The Switch passes its Power On Self Test and continues to

operate normally even if one or more modules are disabled.

units, the LED indicates the position of the unit in the stack

and that a link is present.

When the Switch is stand-alone and not part of a stack, LED

1 is on.

When a software upgrade is in progress, the Unit LEDs of the

unit that is being upgraded flash on and off in the following

sequence —

1,2,4,6,8,7,5,3 (24-port)

1,2,3,4,8,7,6,5 (48-port)

The Switch physically forms a stack with other Switch 4400

units, but cannot be managed as part of that stack until all

units have been upgraded to software version 2.0 or later.

has a Power over Ethernet error.

LED Color Indicates Power Utilization LEDs (3C17205 only)

Green 4 LEDs showing total power being delivered as a percentage

of maximum possible.

Switch 4400 — Rear View Detail 19

Switch 4400 — Rear View Detail

Power Socket The Switch automatically adjusts its power setting to any supply voltage

Redundant Power

System Socket

Console Port The console port allows you to connect a terminal and perform remote or

Figure 5 Switch 4400 (all models) — rear view

in the range 90-240 VAC.

To protect against internal power supply failure, you can use this socket to connect a Switch 4400 to a SuperStack 3 Advanced Redundant Power System (RPS). See “Connecting a Redundant Power System” on page 30.

local out-of-band management. The console port uses a standard null modem cable and is set to auto-baud, 8 data bits, no parity and 1 stop bit.

Expansion Module

Slots

You can use these slots to install Expansion Modules. These allow the Switch to support various forms of connection and add extra functionality to your Switch. For example you can install a Cascade module to enable the Switch to be stacked with other Switches. Please note that Power over Ethernet is not supported on expansion modules on the Switch 4400 PWR (3C17205). Contact your supplier for more information.

20 CHAPTER 1: INTRODUCING THE SUPERSTACK 3 SWITCH 4400

WARNING: When an Expansion Module is not installed, ensure the blanking plate is fitted by tightening all screws with a suitable tool.

Default Settings Table 5 shows the default settings for the Switch 4400:

Tab le 5 Default Settings

Feature Switch 4400 Automatic IP Configuration Enabled Port Status Enabled Port Speed 10/100 Mbps ports are auto-negotiated

TR-RJ ports (3C17210) are fixed at 100 Mbps

Duplex Mode All fixed 10BASE-T and 100BASE-TX ports are

auto-negotiated 100BASE-FX ports default to full-duplex mode

(100 FD) and must be manually set to half-duplex mode (100 HD) if required.

Power over Ethernet Enabled (3C17205 only) Flow Control ■ Enabled in half-duplex mode

■ Auto-negotiated in full-duplex mode

Broadcast Storm Control Enabled Virtual LANs (VLANs) All ports belong to the untagged Default VLAN

(VLAN 1) with IEEE Std 802.1Q-1998 learning operational

Link Aggregation Control Protocol (LACP)

IP Multicast Filtering Filtering enabled Rapid Spanning Tree Protocol Enabled Fast Start ■ Enabled on front panel ports

RMON Alarm Enabled Smart Auto-Sensing Enabled Webcache Support Disabled Traffic Prioritization All ports prioritize NBX VoIP traffic (LAN and IP).

Port Security Disabled per port Configuration Save and

Restore

Disabled per port

■ Disabled on rear panel port

All ports set to “best effort” for all other traffic.

Disabled

Default Settings 21

To make Webcache Support, Traffic Prioritization and Configuration Save and Restore available on the SuperStack 3 Switch 4400 SE, upgrade the product to the Switch 4400 SE Enhanced Software Upgrade (3C17207).

If you initialize a Switch unit by selecting System > Control > Initialize in the Web interface or by entering system control initialize

the Command Line Interface, the following settings are retained to allow you to connect to and manage the Switch:

■ IP Address

■ Subnet Mask

■ Default Router

22 CHAPTER 1: INTRODUCING THE SUPERSTACK 3 SWITCH 4400

INSTALLING THE SWITCH

This chapter contains the information you need to install and set up the Switch 4400. It covers the following topics:

■ Package Contents

■ Choosing a Suitable Site

■ Rack-mounting

■ Placing Units On Top of Each Other

■ Stacking Units

■ The Power-up Sequence

WARNING: Safety Information. Before installing or removing any components from the Switch 4400 or carrying out any maintenance procedures, you must read the safety information provided in Appendix A of this guide.

AVERTISSEMENT: Consignes de sécurité. Avant d'installer ou d'enlever tout composant du Switch 4400 ou d'entamer une procédure de maintenance, lisez les informations relatives à la sécurité qui se trouvent dans l'Appendice A de ce guide.

VORSICHT: Sicherheitsinformationen. Bevor Sie Komponenten aus dem Switch 4400 entfernen oder dem Switch 4400 hinzufuegen oder Instandhaltungsarbeiten verrichten, lesen Sie die Sicherheitsanweisungen, die in Appendix A (Anhang A) in diesem Handbuch aufgefuehrt sind.

24 CHAPTER 2: INSTALLING THE SWITCH

Package Contents ■ Switch unit

■ CD-ROM (includes documentation related to your Switch)

■ Getting Started Guide (this guide)

■ Management Quick Reference Guide

■ Release Notes

■ Unit Information Labels

■ Warranty Information

■ Power Cord

■ 2 x Mounting brackets

■ 4 x Screws

■ 4 x Rubber feet

Choosing a Suitable Site

The Switch is suited for use on a desktop, either free standing or mounted in a standard 19-inch equipment rack. Alternatively, the Switch can be mounted in a wiring closet or equipment room, as an aggregator for other Hubs and Switches. A rack-mounting kit containing two mounting brackets is supplied with the Switch.

CAUTION: Ensure that the ventilation holes are not obstructed.

When deciding where to position the Switch, ensure that:

■ Cabling is located away from:

■ sources of electrical noise such as radios, transmitters and

broadband amplifiers.

■ power lines and fluorescent lighting fixtures

■ The Switch is accessible and cables can be connected easily.

■ Water or moisture cannot enter the case of the Switch.

■ Air flow is not restricted around the Switch or through the vents in the

side of the Switch. 3Com recommends that you provide a minimum of 25mm (1in.) clearance.

■ Air temperature around the Switch does not exceed 40 °C (104 °F).

If the Switch is installed in a 19-inch rack or closed assembly its local air temperature may be greater than room ambient temperature.

Rack-mounting 25

■ The air is as free from dust as possible.

■ The unit is installed in a clean, air conditioned environment.

■ No more than eight Switch units are placed on top of one another, if

the units are free-standing.

■ The Switch is situated away from sources of conductive (electrical)

dust, for example laser printers.

■ The AC supply used by the Switch is separate to that used by units

that generate high levels of AC noise, for example air conditioning units and laser printers.

Rack-mounting The Switch 4400 is 1U high and will fit in most standard 19-inch racks.

CAUTION: Disconnect all cables from the Switch before continuing. Remove all self adhesive pads from the underside of the Switch if they have been fitted.

To rack-mount your Switch:

1 Place the Switch the right way up on a hard flat surface, with the front

facing towards you.

2 Locate a mounting bracket over the mounting holes on one side of the

Switch, as shown in Figure 6.

26 CHAPTER 2: INSTALLING THE SWITCH

Figure 6 Fitting a bracket for rack-mounting

3 Insert the two screws and tighten with a suitable screwdriver.

You must use the screws supplied with the mounting brackets. Damage caused to the unit by using incorrect screws invalidates your warranty.

4 Repeat steps 2 and 3 for the other side of the Switch. 5 Insert the Switch into the 19-inch rack and secure with suitable screws

(not provided). Ensure that ventilation holes are not obstructed.

6 Connect network cabling. 7 Finally place a unit information label on the unit in an easily accessible

position. The unit information label shows the following:

■ The 3Com product name of the Switch

■ The 3Com 3C number of the Switch

■ The unique MAC address (Ethernet address) of the Switch

■ The serial number of the Switch

You may need this information for fault reporting purposes.

Placing Units On Top of Each Other 27

Placing Units On Top of Each Other

If the Switch units are free-standing, up to eight units can be placed one

on top of the other. If you are mixing a variety of SuperStack

3 Switch

and Hub units, the smaller units must be positioned at the top.

If you are placing Switch units one on top of the other, you must use the self-adhesive rubber pads supplied. Apply the pads to the underside of each Switch, sticking one in the marked area at each corner. Place the Switch units on top of each other, ensuring that the pads of the upper unit line up with the recesses of the lower unit.

Stacking Units Switch 4400 units can be stacked together and then treated as a single

manageable unit with one IP address. Any combination of 24-port and 48-port units is allowed in a single stack, as long as the total number of front panel ports does not exceed the limit of 192 ports. The following combinations are allowed:

■ 4 x 48-port Switches

■ 3 x 48-port Switches and 2 x 24-port Switches

■ 2 x 48-port Switches and 4 x 24-port Switches

■ 1 x 48-port Switch and 6 x 24-port Switches

■ 8 x 24-port Switches

The SuperStack 3 Switch 4400 SE can only be stacked with non-SE Switches if it has been upgraded using the Switch 4400 SE Enhanced Software Upgrade (3C17207). An upgraded Switch 4400 SE cannot be stacked with a normal Switch 4400 SE.

How To Stack Units To stack two Switch 4400 units you will need to order the SuperStack 3

Switch Cascade Stacking Kit (3C17227). The kit consists of two Cascade Modules and a Cascade Cable. Both Switches must have an unused expansion slot to allow a Cascade Module to be fitted.

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