3Com 3848, 3812, 3824 User Manual
SuperStack®3 Switch 3812, Switch 3824, and
Switch 3848
Getting Started Guide
3C17401
3C17400
3CR17402-91
http://www.3com.com/
Part No. DUA1740-0AAA03 Rev. 01
Published September 2004
3Com Corporation
350 Campus Drive
Marlborough
MA USA 01752-3064
Copyright © 2004, 3Com Corporation. All rights reserved. No part of this documentation may be reproduced
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please contact 3Com and a copy will be provided to you.
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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
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CONTENTS
ABOUT THIS GUIDE
Conventions 8
Related Documentation 9
Accessing Online Documentation 9
Documentation Comments 10
1 INTRODUCING THE SUPERSTACK 3 SWITCH 3812,
S
WITCH 3824, AND SWITCH 3848
About the Switch 12
Summary of Hardware Features 12
Switch — Front View Detail 13
10BASE-T/
100BASE-TX/
1000BASE-T Ports 14
Dual Personality SFP Ports 14
Console Port 14
LEDs 15
Switch — Rear View Detail 16
Power Socket 17
Redundant Power System Socket (Switch 3848 only) 17
Default Settings 17
2 INSTALLING THE SWITCH
Package Contents 20
Choosing a Suitable Site 20
Rack-mounting 21
Placing Units On Top of Each Other 22
The Power-up Sequence 23
Powering-up the Switch 23
Checking for Correct Operation of LEDs 23
Connecting a Redundant Power Supply (Switch 3848 only) 23
Choosing the Correct Cables 24
SFP Operation 25
Approved SFP Transceivers 25
Inserting an SFP Transceiver 25
Removing an SFP Transceiver 27
3 SETTING UP FOR MANAGEMENT
Setting Up Overview 30
IP Configuration 31
Preparing for Management 32
Manually Configuring IP Information 32
Connecting to the Console Port 32
Viewing Automatically Configured IP Information 36
Using 3Com Network Supervisor 36
Connecting to the Console Port 36
Methods of Managing a Switch 39
Command Line Interface Management 39
Web Interface Management 40
SNMP Management 40
Setting Up Command Line Interface Management 40
CLI Management via the Console Port 41
CLI Management over the Network 41
Setting Up Web Interface Management 42
Pre-requisites 42
Web Management Over the Network 43
Setting Up SNMP Management 43
Pre-requisites 43
Default Users and Passwords 44
Changing Default Passwords 44
4 PROBLEM SOLVING
Solving Problems Indicated by LEDs 46
Solving Hardware Problems 47
Solving Communication Problems 49
Solving Software Upgrade Problems 50
A SAFETY INFORMATION
Important Safety Information 52
L’information de Sécurité Importante 54
Wichtige Sicherheitsinformationen 56
Power Cord Set — Japan 57
B PIN-OUTS
Null Modem Cable 59
PC-AT Serial Cable 60
Modem Cable 61
RJ-45 Pin Assignments 61
C TECHNICAL SPECIFICATIONS
Switch 3812, Switch 3824, and Switch 3848 63
D OBTAINING SUPPORT FOR YOUR PRODUCT
Register Your Product to Gain Service Benefits 65
Purchase Value-Added Services 65
Troubleshoot Online 65
Access Software Downloads 66
Contact Us 66
Telephone Technical Support and Repair 66
INDEX
REGULATORY NOTICES
ABOUT THIS GUIDE
This guide provides all the information you need to install and use 3Com®
®
SuperStack
3 Switch 3812 (3C17401), Switch 3824 (3C17400), or
Switch 3848 (3CR17402-91) in its default state.
The guide is intended for use by network administrators who are
responsible for installing and setting up network equipment;
consequently, it assumes a basic working knowledge of LANs (Local Area
Networks).
Please refer to the CD-ROM that accompanies your Switch for the
following:
■ Management Interface Reference Guide — an online guide which
gives you detailed information on how to use the web interface and
command line interface to manage the Switch.
■ Other documentation relating to the 3Com SuperStack 3
Switch 3812, Switch 3824, or Switch 3848.
■ 3Com Network Supervisor — a powerful network management tool
for small to medium enterprise networks.
■ A number of other useful applications.
If the information in the release notes that are shipped with your product
differ from the information in this guide, follow the instructions in the
release notes.
Most user guides and release notes are available in Adobe Acrobat
Reader Portable Document Format (PDF) or HTML on the 3Com
World Wide Web site:
http://www.3com.com/
8 ABOUT THIS GUIDE
Conventions Ta bl e 1 and Tab le 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
instructions.
Caution Information that alerts you to potential loss of data or
potential damage to an application, system, or device.
Warning Information that alerts you to potential personal
injury.
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 <password>.
Commands The word “command” means that you must enter the
command exactly as shown and then press Return or Enter.
Commands appear in bold. Example:
To display port information, enter the following command:
bridge port detail
The words “enter”
and “type”
When you see the word “enter” in this guide, you must type
something, and then press Return or Enter. Do not press
Return or Enter when an instruction simply says “type.”
Keyboard key names If you must press two or more keys simultaneously, the key
names are linked with a plus sign (+). Example:
Press Ctrl+Alt+Del
Words in italics Italics are used to:
■ Emphasize a point.
■ Denote a new term at the place where it is defined in the
text.
■ Identify menu names, menu commands, and software
button names. Examples:
From the Help menu, select Contents.
Click OK.
Related Documentation 9
Related Documentation
In addition to this guide, each Switch documentation set includes the
following:
■ Management Quick Reference Guide
This guide contains:
■ a list of software features supported by each Switch.
■ a summary of the web interface and command line interface
commands for the Switch.
■ Release Notes
These notes provide information about the current software release,
including new features, modifications, and known problems.
■ Switch Implementation Guide
This guide contains information on the features supported by your
Switch and how they can be used to optimize your network. It is
supplied in PDF format on the CD-ROM that accompanies the Switch.
■ Management Interface Reference Guide
This guide provides detailed information about the web interface and
command line interface that enable you to manage the Switch. It is
supplied in HTML format on the CD-ROM that accompanies the
Switch.
Accessing Online Documentation
There are other publications you may find useful:
■ Documentation accompanying the SFP Transceivers.
■ Documentation accompanying 3Com Network Supervisor. This is
supplied on the CD-ROM that accompanies the Switch.
The CD-ROM supplied with your Switch contains the following online
documentation:
■ Switch Implementation Guide (PDF format).
■ Switch Management Interface Reference Guide (HTML format).
■ Other documentation relating to the Switch 3812, Switch 3824, or
Switch 3848 (PDF format).
10 ABOUT THIS GUIDE
To access the online documentation from the CD-ROM:
1 Insert the CD-ROM into the relevant CD-ROM drive. If your PC has
auto-run enabled, a splash screen will be displayed automatically.
2 Select the Documentation section from the contents page.
If the online documentation is to be accessed from a local drive or server,
you will need to access the CD-ROM contents via the root directory and
copy the files from the CD-ROM to a suitable directory.
■ The HTML Reference Guide is stored in the Docs/referenceguide
on the CD-ROM. The documentation is accessed using the index.htm
file.
■ The PDF Implementation Guide is stored in the
Docs/implementation directory of the CD-ROM.
3Com recommends that you copy the Docs/referenceguide
directory as a whole to maintain the structure of the files.
Documentation Comments
Your suggestions are very important to us. They will help make our
documentation more useful to you. Please e-mail comments about this
document to 3Com at:
pddtechpubs_comments@3com.com
Please include the following information when commenting: Document
title, Document part number (on the title page) and Page number (if
appropriate).
Example:
Part Number DUA1740-0AAA03
SuperStack 3 Switch 3812, Switch 3824, and Switch 3848 Getting
Started Guide
Page 10
1
INTRODUCING THE SUPERSTACK 3
S
WITCH 3812, SWITCH 3824, AND
WITCH 3848
S
This chapter contains introductory information about the Switch 3812,
Switch 3824, and Switch 3848 and how they can be used in your
network. It covers summary information about the hardware and the
following topics:
■ About the Switch
■ Switch — Front View Detail
■ Switch — Rear View Detail
■ Default Settings
12 CHAPTER 1: INTRODUCING THE SUPERSTACK 3 SWITCH 3812, SWITCH 3824, AND SWITCH 3848
About the Switch The Switch 3812, Switch 3824 and Switch 3848 units are
10/100/1000 Mbps Ethernet Switches which consist of either:
■ 12 10BASE-T/100BASE-TX/1000BASE-T RJ-45 ports (Switch 3812) or
■ 24 10BASE-T/100BASE-TX/1000BASE-T RJ-45 ports (Switch 3824) or
■ 48 10BASE-T/100BASE-TX/1000BASE-T RJ-45 ports (Switch 3848)
and:
■ Four SFP ports
The highest four numbered RJ-45 ports are combination ports. When an
SFP module is inserted it has priority over the 10/100/1000 port of the
same number (9–12 on the Switch 3812, 21–24 on the Switch 3824, and
45-48 on the Switch 3848).
For information about using the software features of the Switch, refer to
the “Switch Management Interface Reference Guide” on the CD-ROM
that accompanies the Switch.
Summary of
Hardware Features
Ta bl e 3
summarizes the hardware features that are supported by the
Switch 3812, Switch 3824, and Switch 3848.
Tab le 3 Hardware features
Feature Switch 3812, Switch 3824, and Switch 3848
MAC Addresses Up to 16,000 supported
Forwarding Modes Store and Forward
Auto-negotiation Supported on all ports
Auto MDI/MDIX Supported on all 10/100/1000 ports
Duplex Modes Half and full duplex on all 10/100/1000 ports when
SFP Gigabit Ethernet
Ports
Flow Control Supported on all ports
Traffic Prioritization Supported (IEEE Std 802.1D, 1998 Edition)
Fast Ethernet and
Gigabit Ethernet Ports
running at 10 Mbps or 100 Mbps.
Supports fiber Gigabit Ethernet short-wave (SX),
long-wave (LX) and long-haul (LH70) transceivers in any
combination
Eight traffic queues per port
Auto-negotiating 10BASE-T/100BASE-TX/1000BASE-T
and SFP ports
Switch — Front
View Detail
Switch — Front View Detail 13
Feature Switch 3812, Switch 3824, and Switch 3848
RPS Support Connects to SuperStack 3 Advanced Redundant Power
System (ARPS). (Switch 3848 only)
Mounting 19-inch rack or stand-alone mounting
Figure 1 Switch 3812 — front view
Figure 2 Switch 3824 — front view
14 CHAPTER 1: INTRODUCING THE SUPERSTACK 3 SWITCH 3812, SWITCH 3824, AND SWITCH 3848
Figure 3 Switch 3848 — 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/
1000BASE-T Ports
Dual Personality SFP
Ports
The 10BASE-T/100BASE-TX/1000BASE-T ports have RJ-45 connectors and
are configured as Auto MDIX (cross-over).
The default state for these ports is auto-negotiation enabled, where the
speed, duplex and flow control modes of a link are automatically
detected to provide the highest available bandwidth with the link partner.
Alternatively, auto-negotiation can be disabled. These ports can be
manually configured to 10 Mbps half duplex, 100 Mbps half duplex,
10 Mbps full duplex or 100 Mbps full duplex. It is not possible to
manually configure a 1000 Mbps link as auto-negotiation is mandatory in
the 1000 Mbps standard. If auto-negotiation is disabled, Auto MDIX
cannot function and the ports are fixed as MDIX (cross-over) mode.
If auto-negotiation is disabled on a 1000 Mbps port, the speed will drop
to the highest available speed. By default this is 100 Mbps.
The four Dual Personality SFP (Small Form Factor Pluggable) ports support
fiber Gigabit Ethernet short-wave (SX), long-wave (LX) and long-haul
(LH70) transceivers in any combination. This offers you the flexibility of
Switch — Front View Detail 15
using SFP transceivers to provide connectivity between the Switch and
remote 1000 Mbps workgroups or to create a high capacity aggregated
link backbone connection.
The SFP ports are capable of auto-negotiating flow control. As the speed
and duplex modes are fixed by the media type, only the flow control is
negotiated with the link partner. Alternatively, auto-negotiation can be
disabled and the flow control setting can be manually configured.
Console Port The console port allows you to connect a terminal and perform remote or
local out-of-band management. The Switch 3812 and Switch 3824 have
a DB-9 serial connector and need a serial cable to connect to your PC.
The Switch 3848 has an RJ-45 serial port and is supplied with an RJ-45 to
DB-9 cable.
The standard null modem cable is set to autobaud (up to a maximum of
19,200 baud), 8 data bits, no parity and 1 stop bit.
LEDs Ta bl e 4
status according to color. For information on using the LEDs for problem
solving, see “
Tab le 4 LED behavior
LED Color Indicates
Port Status/Packet LEDs
lists LEDs visible on the front of the Switch, and how to read their
Checking for Correct Operation of LEDs” on page 23.
Green A high speed (1000 Mbps) link is present, and the port
is enabled.
Green flashing A high speed (1000 Mbps) link is present and active.
Yellow A low speed (10/100 Mbps) link is present, and the
port is enabled.
Yellow flashing A low speed (10/100 Mbps) link is present and active.
Green for one
second, Amber
for one second,
then OFF until
operational.
Alternate yellow
then green
flashing (fast)
Alternate yellow
then green
flashing
POST in operation, all LEDs perform a one second lamp
test.
A port has failed a loop back test during POST.
A link is present but the port has been disabled.
16 CHAPTER 1: INTRODUCING THE SUPERSTACK 3 SWITCH 3812, SWITCH 3824, AND SWITCH 3848
LED Color Indicates
Off No link is present.
Power LED (Switch 3812 and Switch 3824)
Green The Switch is powered-up and operating normally.
Red The Switch has a fault with the Power Supply Unit.
Off The Switch is not receiving power or there is a fault
with the Power Supply Unit.
Self Test LED (Switch 3812 and Switch 3824)
Green flashing There is a test in progress.
Green All tests have been passed and the Switch is ready for
Red A fault has occurred.
Red flashing An internal fan has failed.
Off The unit is booting-up.
Power/Self Test LED (Switch 3848 only)
Green The Switch is powered-up and operating normally.
Green flashing The Switch is either downloading software or is
Yellow The Switch is faulty.
Off The Switch is not receiving power or there is a fault
Fault LED (Switch 3848 only)
Red The Switch and/or the PSU are above critical
Off The Switch and PSU are below critical temperature.
use.
initializing (which includes running a Power On Self
Test).
with the Power Supply unit.
temperature but below critical shut down temperature.
Fans are operating normally.
One or more fans have failed.
Switch — Rear View
Detail
Figure 4 Switch 3812 and Switch 3824 — rear view
Power Socket
Default Settings 17
Figure 5 Switch 3848 — rear view
Redundant Power System Socket
Power Socket Each Power Supply automatically adjusts its power setting to any power
voltage in the range 100-240 VAC.
Redundant Power
System Socket
(Switch 3848 only)
To protect against internal power supply failure, you can use this socket
to connect the Switch to a SuperStack 3 Advanced Redundant Power
System. See “
on page 23
Connecting a Redundant Power Supply (Switch 3848 only)”
.
Default Settings Ta bl e 5 shows the default settings for the Switch 3812, Switch 3824 and
Switch 3848. If you initialize one of the Switch units, it is returned to
these defaults.
Tab le 5 Default Settings
Feature Switch 3812, Switch 3824, or Switch 3848
Port Status Enabled
Port Speed Auto-negotiated
Duplex Mode Auto-negotiated
Flow Control Disabled
Broadcast Storm Control Enabled
Threshold: 3000 broadcast frames per second
Virtual LANs (VLANs) All ports belong to the untagged Default VLAN
(VLAN 1)
Multicast Filtering IGMP filtering enabled
Rapid Spanning Tree Protocol Enabled
Link Aggregation Control
Protocol (LACP)
Spanning Tree Protocol Enabled
Smart Auto-sensing Enabled
Disabled per port
18 CHAPTER 1: INTRODUCING THE SUPERSTACK 3 SWITCH 3812, SWITCH 3824, AND SWITCH 3848
If you initialize a Switch unit by selecting System > Control > Initialize in
the Web interface or by entering system control initialize in
the Command Line Interface, the following settings are retained to allow
you to connect to and manage the Switch:
■ IP Address
■ Subnet Mask
■ Default Gateway
2
INSTALLING THE SWITCH
This chapter contains the information you need to install and set up the
Switch 3812, Switch 3824, or Switch 3848. It covers the following topics:
■ Package Contents
■ Choosing a Suitable Site
■ Rack-mounting
■ Placing Units On Top of Each Other
■ The Power-up Sequence
■ SFP Operation
WARNING: Safety Information. Before installing or removing any
components from the Switch or carrying out any maintenance
procedures, you must read the safety information provided in Appendix A
of this guide.
AVERTISSEMENT: Consignes de sécurité. Avant d'installer ou d'enlever
tout composant de Switch ou d'entamer une procédure de maintenance,
lisez les informations relatives à la sécurité qui se trouvent dans
l'Appendice A de ce guide.
VORSICHT: Sicherheitsinformationen. Bevor Sie Komponenten aus
dem Schalter entfernen oder den Schalter hinzufügen oder
Instandhaltungsarbeiten verrichten, lesen Sie die
Sicherheitsanweisungen, die in Anhang A in diesem Handbuch
aufgeführt sind.
20 CHAPTER 2: INSTALLING THE SWITCH
Package Contents ■ Switch unit
■ CD-ROM
■ This Guide
■ Management Quick Reference Guide
■ Release Notes
■ Warranty Flyer
■ Power Cord
■ 2 x securing brackets
■ 4 x screws (Switch 3812 and Switch 3824)
■ 8 x screws (Switch 3848)
■ 4 x rubber feet
■ RJ45 to DB9 converter cable (Switch 3848 only)
Choosing a Suitable Site
The Switch is suited for use in an internal wiring closet, a network room,
or telecommunications room, where it can be mounted in a standard
19-inch equipment rack, or free-standing.
CAUTION: Ensure that the ventilation holes are not obstructed.
The Switch 3848 is fitted with high speed fans that have a high audible
output while running at full speed. The Switch is designed to reduce the
fan speed shortly after power on (if thermal conditions allow) which will
also reduce the fan noise generated.
When deciding where to position the Switch, ensure that:
■ Cabling is located away from:
■ sources of electrical noise such as radios, transmitters and
broadband amplifiers.
■ power lines and fluorescent lighting fixtures.
■ The Switch is accessible and cables can be connected easily.
■ Water or moisture cannot enter the case of the Switch.
■ Air flow is not restricted around the Switch or through the vents in the
side of the Switch. 3Com recommends that you provide a minimum of
25 mm (1 in.) clearance.
■ Air temperature around the Switch does not exceed 40 °C (104 °F).
Rack-mounting 21
If the Switch is installed in a 19-inch rack or closed assembly its local air
temperature may be greater than room ambient temperature.
■ The air is as free from dust as possible.
■ The Switch is situated away from sources of conductive (electrical)
dust, for example laser printers.
■ The unit is installed in a clean, air conditioned environment.
■ 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.
■ No more than four Switch units are placed on top of one another, if
the units are free-standing.
Rack-mounting The Switch 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.
CAUTION: If you use a shelf or support ensure that it will not obstruct
the air flow through the side panels of the Switch.
To rack-mount your Switch:
1 Place the Switch the right way up on a hard flat surface, with the front
facing towards you.
2 Locate a securing bracket over the mounting holes on one side of the
Switch, as shown in Figure 6
.
3 Insert the screws and tighten with a suitable screwdriver.
22 CHAPTER 2: INSTALLING THE SWITCH
Figure 6 Fitting a bracket for rack-mounting
You must use the screws supplied with the securing brackets. Damage
caused to the unit by using incorrect screws invalidates your warranty.
Placing Units On Top of Each Other
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.
If the Switch units are free-standing, up to four units can be placed one
on top of the other. If you are mixing a variety of 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.
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