3com OfficeConnect User manual

Category
Network switches
Type
User manual

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®
http://www.3com.com/
OfficeConnect
Switch 140M
3C16731
Part No. DUA1673-1AAA01
Published July 1997
3Com Corporation 5400 Bayfront Plaza Santa Clara, California 95052-8154
Copyright ©
3Com Technologies, 1997.
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 permission from 3Com Technologies.
3Com Technologies reserves the right to revise this documentation and
to make changes in content from time to time without obligation on
the part of 3Com Technologies to provide notification of such revision
or change.
3Com Technologies provides this documentation without warranty of
any kind, either implied or expressed, including, but not limited to, the
implied warranties of merchantability 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.
UNITED STATES GOVERNMENT LEGENDS:
If you are a United States government agency, then this
documentation and the software described herein are provided to you
subject to the following restricted rights:
For units of the Department of Defense:
Restricted Rights Legend: Use, duplication, or disclosure by the
Government is subject to restrictions as set forth in subparagraph (c) (1)
(ii) for Restricted Rights in Technical Data and Computer Software
Clause at 48 C.F.R. 52.227-7013. 3Com Technologies, c/o 3Com
Centre, Boundary Way, Hemel Hempstead, Herts. HP2 7YU, U.K.
For civilian agencies:
Restricted Rights Legend: Use, reproduction, or disclosure is subject to
restrictions set forth in subparagraph (a) through (d) of the Commercial
Computer Software – Restricted Rights Clause at 48 C.F.R. 52.227-19
and the limitations set forth in 3Com Corporation’s standard
commercial agreement for the software. Unpublished rights reserved
under the copyright laws of the United States.
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. If you
are unable to locate a copy, please contact 3Com and a copy will be
provided to you.
Unless otherwise indicated, 3Com registered trademarks are registered
in the United States and may or may not be registered in other
countries.
3Com, NetAge, SmartAgent, SuperStack and Transcend are registered
trademarks of 3Com Corporation. OfficeConnect and TranscendWare
are trademarks of 3Com Corporation. 3ComFacts is a service mark of
3Com Corporation.
CompuServe is a registered trademark of CompuServe, Inc.
Windows and Windows NT are registered trademarks of Microsoft. IPX
is a registered trademark of Ideographix, Inc. Netscape Navigator is a
trademark of Netscape Communications Corporation. Netware is a
registered trademark of Novell Inc.
Other brand and product names may be registered trademarks or
trademarks of their respective holders.
Environmental Statement
It is 3Com’s policy to be environmentally friendly in all its operations.
This manual is printed on paper that comes from sustainable, managed
European forests. The production process for making the pulp has a
reduced AOX level (adsorbable organic halogen) resulting in elemental
chlorine-free paper.
The paper is fully biodegradable and recyclable.
C
ONTENTS
I
MPORTANT
S
AFETY
I
NFORMATION
W
ICHTIGE
S
ICHERHEITSHINWEISE
L’
INFORMATION
DE
S
ÉCURITÉ
I
MPORTANTE
Y
OUR
S
WITCH
A
DDRESSES
A
BOUT
T
HIS
G
UIDE
Introduction 1
How to Use This Guide 1
Conventions 2
Related Documentation 3
1
I
NTRODUCTION
Network Terminology 1-2
How the Switch Can Be Used 1-4
Switching 1-4
Connecting 10BASE-T and 100BASE-TX Networks
1-6
2
C
REATING
Y
OUR
N
ETWORK
LEDs and Ports 2-1
Before You Start 2-4
Hub Connections 2-4
Workstation Connections 2-4
Twisted Pair (TP) Cables 2-5
Positioning Your OfficeConnect Switch 2-5
Using the Rubber Feet and Stacking Clips 2-6
Wall Mounting Your OfficeConnect Switch 2-7
Connecting Workstations and Other Equipment to
Your Switch 2-7
Connecting OfficeConnect Hubs to Your Switch 2-8
Connecting 10BASE-T Hubs 2-8
Connecting a 100BASE-TX Hub 2-9
Checking Hub Connections 2-10
Spot Checks 2-10
3
A
BOUT
S
WITCH
M
ANAGEMENT
Why Manage Your Switch? 3-1
How You Can Manage Your Switch 3-2
Web Interface 3-2
Command Line Interface 3-2
SNMP Network Management 3-3
RMON 3-3
Making a Management Connection to Your Switch 3-4
Managing Through the Console Port 3-5
Managing Over the Network 3-6
RMON Features of the Switch 3-8
4
M
ANAGING
Y
OUR
S
WITCH
U
SING THE
W
EB
I
NTERFACE
Your Web Browser 4-1
Configuring Your Browser 4-2
Accessing the Web Interface 4-2
About the Web Interface 4-5
General Components 4-5
Web Interface Map 4-6
Using the Web Interface 4-7
Displaying the Unit Pages 4-7
Displaying the Management Category Pages 4-7
Page Components 4-8
Making Changes to the Pages 4-8
User Access 4-8
Exiting the Web Interface 4-8
Online Help System 4-9
Unit Pages 4-10
Unit View 4-10
Unit Status 4-11
Management Addresses 4-11
Alert LED 4-12
Console Port Configuration 4-15
Port Setup 4-16
Management Settings Pages 4-18
Contact 4-18
Documentation 4-18
Getting Started 4-19
Location 4-20
Password Setting 4-20
System Name 4-21
Configuration Pages 4-21
Ageing Time 4-21
Forwarding Mode 4-22
Initialize 4-23
PACE 4-23
Reset 4-24
Software Upgrade 4-24
Switch Database 4-25
Health Pages 4-27
Port Graph 4-27
Unit Graph 4-28
5
U
SING
THE
C
OMMAND
L
INE
I
NTERFACE
Using a Terminal Emulator 5-1
HyperTerminal 5-2
Terminal 5-2
Telnet 5-3
Starting the CLI 5-3
Logging On 5-3
Logging Off 5-4
Using the CLI Menus 5-4
CLI Menu Structure 5-5
Navigating the Menus and Entering Commands 5-5
Quick Guide to the Commands 5-6
Commands 5-7
Enabling and Disabling BOOTP 5-7
Setting the IP Configuration 5-7
Viewing the Configuration 5-8
Resetting the Switch 5-9
Initializing the Switch 5-10
Testing the Connection to Other Devices 5-10
6
P
ROBLEM
S
OLVING
Isolating a Problem 6-1
Solving Problems With the Switch 6-2
Solving Problems With the Web Interface 6-3
Solving Problems With the Command Line Interface 6-5
Solving Problems With an SNMP Network Management
Application 6-6
A
D
IMENSIONS
, S
TANDARDS
AND
C
ABLING
Dimensions and Operating Environment A-1
BABT Approval (for U.K. Users Only) A-1
Standards A-1
Cabling A-2
10BASE-T A-2
Straight-through A-2
Crossover A-2
Console A-2
Examples of Null Modem Cables You Can Use A-3
Modem Cable A-4
Management Settings A-4
B
IP
AND
IPX A
DDRESSES
IP Addresses B-1
Obtaining a Registered IP Address B-2
How IP Addresses Work B-2
Assigning IP Addresses to a Small, Contained
Network B-4
IPX Addresses B-4
C
S
ERIAL
W
EB
U
TILITY
Introduction C-1
Installing the Serial Web Utility C-1
Using the Serial Web Utility C-3
Solving Problems With the Serial Web Utility C-4
D
T
ECHNICAL
S
UPPORT
Online Technical Services D-1
World Wide Web Site D-1
3Com Bulletin Board Service D-1
3ComFacts Automated Fax Service D-2
3ComForum on CompuServe
®
Online Service D-3
Support from Your Network Supplier D-4
I
NDEX
3C
OM
C
ORPORATION
L
IFETIME
L
IMITED
W
ARRANTY
E
LECTRO
-M
AGNETIC
C
OMPATABILITY
I
MPORTANT
S
AFETY
I
NFORMATION
WARNING: Warnings contain directions that you
must follow for your personal safety. Follow all
instructions carefully.
Please read the following information carefully before
installing the OfficeConnect unit:
Exceptional care must be taken during installation
and removal of the unit.
Only stack the OfficeConnect unit with other
OfficeConnect units.
Only use the power adapter that is supplied with
the unit to ensure compliance with international
safety standards.
It is essential that the power outlet is located near
the unit and is accessible. You can only remove
power to the OfficeConnect unit by disconnecting
the power adapter from the unit or from the
socket outlet.
This unit operates under SELV conditions (Safety
Extra Low Voltage) according to IEC 950, the
conditions of which are maintained only if the
equipment to which it is connected is also
operational under SELV.
There are no user-replaceable fuses or
user-serviceable parts inside the unit. If you have a
physical problem with the unit that cannot be
solved with problem solving actions in this guide,
contact your supplier.
Disconnect the power adapter before moving the
unit.
WARNING: Twisted Pair RJ45 ports. These are
RJ45 data sockets. They cannot be used as telephone
sockets. Only connect RJ45 data connectors to these
sockets.
W
ICHTIGE
S
ICHERHEITSHINWEISE
ACHTUNG: Die Warnungen enthalten Anweisungen,
die Sie zur eigenen Sicherheit zu befolgen haben.
Lesen Sie bitte die folgenden Informationen sorgfältig
durch, bevor Sie das Gerät einbauen:
Auf besondere Vorsicht muß während des Ein-
und Ausbaus des Gerätes geachtet werden.
Stapeln Sie das Gerät nur mit anderen
OfficeConnect Gerätes zusammen.
Verwenden Sie nur das mit dem Gerät mitgelieferte
Netzteil um die internationalen Sicherheitsstandards
zu erfüllen.
Die Netzsteckdose muß sich in unmittelbarer Nähe
des Gerätes befinden und frei zugänglich sein. Sie
können das Gerät nur spannungsfrei schalten,
indem Sie das Steckernetzteil aus der
Netzsteckdose ziehen oder die Verbindung zum
Gerät unterbrechen.
Dieses Gerät arbeitet mit SELV-Spannung (Safety
Extra Low Voltage, Sicherheitskleinspannung)
gemäß IEC950. Diese Bedingungen werden nur
eingehalten, wenn die Geräte mit denen des
Gerätes verbunden ist ebenfalls mit
SELV-Spannung arbeiten.
Es sind keine von dem Benutzer zu ersetzende oder
zu wartende Teile in dem Gerät vorhanden. Wenn
Sie ein Problem mit dem Gerät haben, das nicht
mittels der Fehleranalyse in dieser Anleitung
behoben werden kann, setzen Sie sich mit Ihrem
Lieferanten in Verbindung.
Bevor das Gerät ausgebaut wird ist das Netzteil zu
ziehen.
ACHTUNG: gedrehte paarfache RJ45 Anschlüsse.
Es sind RJ45 Datenanschlußbuchsen. Sie dürfen nicht
als Telefonanschluß verwendet werden. Verbinden Sie
nur RJ45 Datenstecker mit diesen Anschlüssen.
L’
INFORMATION
DE
S
ÉCURITÉ
I
MPORTANTE
AVERTISSEMENT: Les avertissements contiennent les
instructions que vous devez suivre pour votre sécurité
personnelle. Suivre toutes les instructions avec soin.
Veuillez lire à fond l’information suivante avant
d’installer l’appareil:
Le soin exceptionnel doit être pris pendant
l’installation et l’enlèvement de l’appareil.
Seulement entasser l’appareil avec les autres
appareils OfficeConnect.
Seulement utiliser la pièce de raccordement
d’alimentation qui est fournie avec l’appareil pour
assurer la conformité avec les normes de sécuri
internationales.
C’est essentiel que le socle de prise de courant du
réseau soit localisé proche de l’appareil et soit
accessible. Vous pouvez seulement enlever
l’alimentation de l’appareil en débranchant la
pièce de raccordement d’alimentation de l’unité
ou du socle de prise de courant.
Cet appareil fonctionne sous les conditiones SELV
(Sécurité du Voltage le plus Bas) d’après IEC950,
les conditions desquelles sont maintenues
seulement si le matériel à qui il est branché est
aussi en exploitation sous SELV.
Il n’y a pas de parties remplaceables par les
utilisateurs ou entretenues par les utilisateurs à
l’intérieur de l’appareil. Si vous avez un problème
physique avec l’appareil qui ne peut pas être résolu
avec les actions de la résolution des problèmes
dans ce guide, contacter votre fournisseur.
Débrancher la pièce de raccordement
d’alimentation avant de remuer l’appareil.
AVERTISSEMENT: Les ports RJ45 de paire tordue.
Ceux-ci sont les socles de données RJ45. Ils ne
peuvent pas être utilisés comme socles de téléphone.
Seulement brancher les connecteurs de données RJ45
à ces socles.
Y
OUR
S
WITCH
A
DDRESSES
You can configure IP address information for your
switch, enabling you to manage it over the network.
It is important that you note down this information as
you may need to refer to it when managing the
switch again. Use this page to note down your
settings.
If you want to initialize the switch, the IP address
settings are retained to allow you to continue
managing the switch. If you want to return the switch
to its default address settings, you must enter them
manually.
For information on configuring the IP address settings
using the:
Web interface — refer to “Management
Addresses” on page 4-11.
Command Line Interface — refer to “Setting the IP
Configuration” on page 5-7.
Parameter Default Your setting
Device
name
Switch 140M
Location (blank)
Contact (blank)
IP address 0.0.0.0
Subnet
mask
0.0.0.0
Serial Line
IP address
192.168.101.1
Subnet
mask
255.255.255.0
Router
IP address
0.0.0.0
A
BOUT
T
HIS
G
UIDE
About This Guide provides an overview of this guide,
describes the guide conventions, tells you where to
look for specific information and lists other
publications that may be useful.
Introduction
This guide describes how to set up, manage and get
the most out of your OfficeConnect™ Switch 140M.
This guide is intended for users who are new to
networking but have a basic understanding of what
they want to do. If you have not managed a network
product before, it is possible that you may make
mistakes. We have tried to identify the likely errors
you may make and have provided hints and tips to
help you recover from these situations.
If you are already familiar with network
management, you may be able to skip some of the
information in this guide and use the information
given for reference purposes only.
If there are Release Notes shipped with your product
and the information in them differs from the
information in this guide, follow the Release Notes.
How to Use This Guide
This table shows where to find specific information in
this guide.
If you are looking for... Turn to...
An introduction to the switch and its features Chapter 1
Information on installing and using the switch Chapter 2
Ways you can manage your switch and how to
start your management session
Chapter 3
Information on using the web interface to manage
your switch
Chapter 4
Information on using the Command Line Interface
to manage your switch
Chapter 5
Information on solving any problems Chapter 6
The switch dimensions, the standards it conforms
to, and the cabling you can use with it
Appendix A
An introduction to IP and IPX addresses Appendix B
Information on installing and using the serial web
utility
Appendix C
Technical support Appendix D
2 A
BOUT
T
HIS
G
UIDE
Conventions
Table 1 and Table 2 list conventions that are used
throughout this guide.
Table 1
Icon Notice Type Alerts you to...
Information
note
Important features or instructions
Caution Risk of personal safety, system damage,
or loss of data
Warning Risk of severe personal injury
Table 2
Convention Description
Screen
displays
This typeface represents information as it
appears on the screen
.
The words
“enter”
and “type”
When you see the word “enter” in this guide,
you must type something, and then press the
Return or Enter key. Do not press the Return or
Enter key when an instruction simply says
“type.
[Key] names Key names appear in text in one of two ways:
Referred to by their labels, such as “the
Return key” or “the Escape key”
Written with brackets, such as [Return] or
[Esc].
If you must press two or more keys
simultaneously, the key names are linked with a
plus sign (+). Example:
Press [Ctrl]+[Alt]+[Del].
Menu
commands
and
buttons
Menu commands or button names appear in
italics. Example:
From the
Help
menu, select
Contents
.
Words in
italicized
type
Italics emphasize a point or denote new terms at
the place where they are defined in the text.
Words in
bold
type
Bold text denotes key features.
About This Guide 3
Related Documentation
The following documents form part of the document
set for this product:
Quick Reference Guide
This contains some useful information from this
guide which you may need to refer to regularly.
Product Range Sheet
This is an overview of the other products in the
OfficeConnect range.
4 A
BOUT
T
HIS
G
UIDE
1
I
NTRODUCTION
Welcome to the world of networking with 3Com
®
.
In the modern business environment, communication
and sharing information is crucial. Computer networks
have proved to be one of the fastest modes of
communication but until now only large businesses
could afford the networking advantage.
The OfficeConnect™ product range from 3Com has
changed this, bringing networks into the small office.
As the power of workstations and business
applications increases, heavier demands are made on
the available network bandwidth that, if unchecked,
can lead to performance problems in a hub-based
setup. Installing the OfficeConnect Switch 140M
allows your network to be divided so that traffic can
be contained effectively, reducing the overall load
without affecting access to critical resources.
The switch has four 10BASE-T ports and one
100BASE-TX port, which allows you to connect
10BASE-T and 100BASE-TX hubs and workstations
together, as shown in Figure 1-1
.
Figure 1-1
Small Network with the OfficeConnect Switch 140M
(Circle Shows Units Clipped Together)
1-2 C
HAPTER
1: I
NTRODUCTION
The switch is ideal for use with other OfficeConnect
products. It is compact and attractively designed for
desktop use. It is part of the OfficeConnect range
which neatly stacks together with clips, providing a
range of facilities. For information on this range,
refer to the “OfficeConnect Product Range” sheet
that accompanies this product.
Management
The switch comes ready for use in your network, and
does not require management to get it working.
However, management allows you to perform
additional network functions, for example monitoring
your network and adding security.
The switch has:
A built-in web interface. You can use a web
browser on any type of management station
(for example an IBM-compatible PC) to access the
web interface locally or over the network.
A simple built-in Command Line Interface which
allows you to quickly set up IP address information
for the switch, if you wish to manage it over the
network using the web interface or an SNMP
(IP/IPX-based) network management application,
for example 3Com’s Transcend
®
Enterprise
Manager for Windows
®
.
Network Terminology
A
Network
is a collection of workstations (for
example, IBM-compatible PCs) and other equipment
(for example, printers), connected for the purpose of
exchanging information or sharing resources.
Networks vary in size, some are within a single room,
others span continents.
A
LAN
(Local Area Network) is a network, usually in
an office, that spans no more than a single site.
Ethernet
is a type of LAN, referring to the technology
used to pass information around the network.
It operates at 10Mbps (megabits per second).
Fast Ethernet
is a type of LAN that runs ten times
faster than standard Ethernet. It operates at
100Mbps.
10BASE-T
is the name given to the Ethernet protocol
that runs over
TP
(Twisted Pair) cable.
100BASE-TX
is the name given to the Fast Ethernet
protocol that runs over
TP
(Twisted Pair) cable.
A
Segment
is the length of cable connected to a
port.
Network Terminology 1-3
Bandwidth
refers to the amount of network traffic
the network can carry at any one time (information
capacity) measured in
bps
(bits per second).
Workstations or applications that use the network
heavily are referred to as using high bandwidth
(these are usually users who do a lot of graphical or
multi-media work across the network). Fast Ethernet
has a higher bandwidth than Ethernet, so it can cope
with larger amounts of traffic which results in faster
operation.
A
Network Loop
occurs when two pieces of network
equipment are connected by more than one path
(an illegal configuration in Ethernet and Fast
Ethernet).
Packets
are the units of information your
workstations and other equipment send to each other
over the network. A
Frame
is the data part of the
packet and can be
Unicast
(sent to a single device),
Multicast
(sent to multiple devices), or
Broadcast
(sent to all devices).
Device
is a term that is usually used to refer to a
piece of network equipment. Every device has a
unique address (called a
MAC address
) that is used
to identify it on the network.
Collisions
are a part of normal Ethernet and Fast
Ethernet operation and occur if two or more devices
attempt to transmit at the same time. A sudden
sustained increase in the number of collisions can
indicate a problem with a device, particularly if it is
not accompanied by a general increase in traffic.
SNMP
(Simple Network Management Protocol) is a
protocol that controls how a management station
gains information from a device. SNMP provides:
A set of rules that define how a management
station can communicate with a device.
A
MIB
(Management Information Base) that
defines what information can be obtained from the
device by the management station. Every
SNMP-manageable device has a MIB, which is a list
of information about it.
Unsolicited messages called
Traps
, which work
differently to the usual request/reply management
communication. You can configure a device so that
it generates a trap if a certain condition occurs, for
example a port changing state. The trap is sent to
the management station to inform it of the
occurrence.
1-4 C
HAPTER
1: I
NTRODUCTION
IP
(Internet Protocol) is a data communication
protocol used to connect computers and data
equipment into computer networks. It is used on a
large international network called the
Internet
, which
is composed of universities, government facilities,
research institutions and private companies.
IPX
is a Novell Netware protocol that performs a
similar function to IP.
SLIP
(Serial Line Internet Protocol) allows you to run
the IP protocol over a serial line connection.
A
Modem
(Modulator–Demodulator) is a piece of
equipment used for transmitting computer data over
telephone lines.
How the Switch Can Be Used
Switching
When a network of repeater hubs is in operation,
any information that is sent by the workstations is
passed around the whole network (regardless of the
destination of the information) which results in a lot
of unnecessary traffic that can consume valuable
bandwidth.
The switch solves this problem because it reads the
network traffic and automatically learns what
workstations can be reached through each of its
ports. It can then selectively pass on any information
by transmitting the traffic from the relevant port only
(instead of all ports like a repeater hub). This
operation is called ‘switching’.
The switch effectively divides up your network,
localizing the network traffic and passing on traffic
as necessary, as shown in Figure 1-2
. If you have
workstations that communicate frequently in the
same part of the network, traffic between them is not
passed to the remainder of the network, reducing
the load. This is often referred to as segmenting the
network. A high performance workstation requiring a
How the Switch Can Be Used 1-5
lot of bandwidth may benefit from being connected
directly to the switch.
Figure 1-2
Segmenting Your Network with the Switch
Switching Features
The OfficeConnect Switch 140M behaves as a
standard IEEE 802.1D bridge. This means that its
functionality conforms to that IEEE specification. The
switch has a
switch database
with a capacity for 500
workstation (MAC) addresses.
How the Switch Works
Information is passed around the network in small
units, called
packets
. These packets contain various
MAC addresses
, which are unique addresses that are
permanently stored within each device on your
network:
Source address — the address of the equipment
that sent the packet.
Destination address — the address of the
equipment that the packet is intended for.
Each of the network adapters in your workstations
has a MAC address which is used to identify the
workstation on the network. An example of a MAC
address is ‘08004e0849d1’.
1-6 C
HAPTER
1: I
NTRODUCTION
Using the source addresses, the switch can learn
which workstations are connected to each of its ports.
This information is stored in a
switching database
,
which is a list containing each source address
together with the port (through which the device with
that address is attached to the switch).
Using this database, the switch can then act on future
packets that it receives:
If the destination device is connected to the same
port as the source device, the packet is discarded
(called
filtering
), reducing unnecessary traffic.
If the destination device is connected to a
different port as the source device, the packet is
transmitted through that port (called
forwarding
).
If the destination device is unknown (in other
words, not in the switching database), the packet
is transmitted through all of the other ports (called
flooding
).
The above operation is affected by any security that
you configure for the switch. For example, if you
disable a port (through management), packets will not
be learnt, forwarded or flooded through that port.
Connecting 10BASE-T and 100BASE-TX Networks
This switch enables you to connect 10BASE-T and
100BASE-TX networks together. This means that if
you have both types of network, you can connect
them so all of your workstations can communicate.
Alternatively, if you want to improve performance by
introducing 100BASE-TX (using the OfficeConnect
Fast Ethernet hubs for example), the switch protects
your investment by allowing your existing equipment
to work with the new equipment.
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3com OfficeConnect User manual

Category
Network switches
Type
User manual
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