3COM 6000 User Manual
LAN
®
S
WITCHING
PLEX
6000 E
U
SER
G
XTENDED
UIDE
Part No. 801-00257-000
Published December 1995
Revision 01
3Com Corporation ■ 5400 Bayfront Plaza ■ Santa Clara, California ■ 95052-8154
© 3Com Corporation, 1995. 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 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 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:
restricted Rights in Technical Data and Computer Software clause at 48 C.F.R. 52.227-7013. 3Com Corporation, 5400 Bayfront Plaza, Santa Clara,
California 95052-8145.
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’s standard commercial agreement for
the software. Unpublished rights reserved under the copyright laws of the United States.
3ComFacts, Ask3Com, CardFacts, NetFacts, and CardBoard are service marks of 3Com Corporation.
3Com and NETBuilder II are registered trademarks of 3Com Corporation.
LANplex and Transcend are trademarks of 3Com Corporation.
CompuServe is a registered trademark of CompuServe, Inc.
3Com registered trademarks are registered in the United States, and may or may not be registered in other countries.
Other brand and product names may be registered trademarks or trademarks of their respective holders.
Guide written, edited, and illustrated by Trish Crawford, Lynne Gelfand, Michael Jenness, Patricia Johnson, Michael Taillon, and Iain Young.
Use, duplication or disclosure by the Government is subject to restrictions as set forth in subparagraph (c) (1) (ii) for
P
ART
C
ONTENTS
A
BOUT THIS GUIDE
Introduction 1
How to Use This Guide 1
Conventions 2
LANplex 6000 Documentation 3
Documentation Comments 4
IG
1
ETTING STARTED
LAN
PLEX EXTENDED SWITCHING FEATURES
About LANplex Extended Switching 1-1
Using Menus to Perform Tasks 1-2
IP Menu 1-3
IPX Menu 1-4
AppleTalk Menu 1-5
2
I
NSTALLING EXTENDED SWITCHING SOFTWARE
About Installing Software 2-1
Copying Software to a Hard Disk 2-1
Copying to UNIX 2-2
Copying to DOS 2-3
Loading Software 2-4
P
ART
II A
3
R
What is Routing? 3-1
Bridging/Routing Models 3-4
4
R
IP Routing and the OSI Model 4-1
The Elements of IP Routing 4-2
IP Routing Transmission Errors 4-9
IP Routing References 4-10
BOUT ROUTING PROTOCOLS
OUTING AND THE
LANplex in a Subnetted Environment 3-2
Integrating Bridging and Routing 3-3
Traditional Bridging/Routing Model 3-4
LANplex Bridging/Routing Model 3-6
OUTING WITH
IP Addresses 4-2
Address Classes 4-3
The Subnet Part of the IP Address 4-3
Router Interfaces 4-4
Routing Table 4-5
Static Routes 4-6
Dynamic Routes Using RIP 4-6
Default Route 4-7
Address Resolution Protocol (ARP) 4-7
IP
LAN
PLEX SYSTEM
5
R
OUTING WITH
IPX Routing in the NetWare Environment 5-1
Internet Packet Exchange (IPX) 5-2
Routing Information Protocol (RIP) 5-3
Service Advertising Protocol (SAP) 5-3
How IPX Routing Works 5-4
IPX Packet Format 5-4
IPX Packet Delivery 5-6
Sending Node’s Responsibility 5-6
Router’s Responsibility 5-7
The Elements of IPX Routing 5-8
Router Interfaces 5-8
Routing Tables 5-8
Generating Routes 5-9
Selecting the Best Route 5-10
IPX
Service Advertising Protocol (SAP) 5-10
Internetwork Service Information 5-10
SAP Packet Structure 5-11
Server Information Table 5-13
Server Information Maintenance 5-14
6
R
OUTING WITH APPLETALK
About AppleTalk 6-1
AppleTalk Network Elements 6-1
AppleTalk Networks 6-2
AppleTalk Nodes 6-2
Named Entities 6-2
AppleTalk Zones 6-3
Seed Routers 6-4
AppleTalk Protocols 6-4
Physical Connectivity 6-5
The Datagram Delivery Protocol (DDP) 6-6
End-to-End Services 6-6
Transport Layer Protocols 6-6
The Session Layer Protocols 6-9
The Presentation Layer 6-10
About AARP 6-10
P
ART
III A
7
A
Administering Interfaces 7-1
Administering Routes 7-5
Administering the ARP Cache 7-9
DMINISTERING ROUTING PROTOCOLS
DMINISTERING
Displaying Interfaces 7-3
Defining an Interface 7-3
Modifying an Interface 7-4
Removing an Interface 7-5
Displaying the Routing Table 7-6
Defining a Static Route 7-7
Removing a Route 7-8
Flushing a Route 7-8
Setting the Default Route 7-8
Removing the Default Route 7-9
Displaying the ARP Cache 7-9
IP R
OUTING
Removing an ARP Cache Entry 7-10
Flushing the ARP Cache 7-10
Administering UDP Helper 7-11
Displaying UDP Helper Information 7-11
Defining a Port and IP Forwarding Address 7-12
Removing a Port and IP Forwarding Address 7-12
Setting the Hop Count Limit 7-13
Setting the BOOTP Relay Threshold 7-13
Enabling/ Disabling IP Forwarding 7-13
Setting the RIP Mode 7-14
Pinging an IP Station 7-15
Displaying IP Statistics 7-16
8
A
DMINISTERING
Administering Interfaces 8-2
Displaying IPX Interfaces 8-3
Defining an Interface 8-3
Modifying an Interface 8-4
Removing an Interface 8-4
Administering Routes 8-5
Displaying the Routing Table 8-6
Defining a Static Route 8-6
Removing a Route 8-7
Flushing Routes 8-7
Administering Servers 8-8
Displaying the Server Table 8-8
Defining a Static Server 8-9
Removing a Server 8-10
Flushing Servers 8-10
Setting IPX Forwarding 8-11
Setting the RIP Mode 8-11
Setting the Enhanced RIP Mode 8-12
Setting the SAP Mode 8-13
Displaying Statistics 8-14
Displaying IPX Summary Statistics 8-14
Displaying IPX RIP Statistics 8-15
Displaying IPX SAP Statistics 8-16
Displaying IPX Forwarding Statistics 8-17
IPX R
OUTING
P
ART
9
A
Administering Interfaces 9-2
Administering Routes 9-4
Administering the AARP Cache 9-6
Displaying the Zone Table 9-8
Configuring Forwarding 9-10
Configuring Checksum 9-10
Pinging an AppleTalk Node 9-11
Viewing Appletalk Statistics 9-11
IV A
DMINISTERING APPLETALK ROUTING
Displaying AppleTalk Interfaces 9-3
Defining an Interface 9-3
Removing an Interface 9-4
Displaying the Routing Table 9-5
Flushing all Routes 9-6
Displaying the AARP Cache 9-7
Removing an Entry in the Cache 9-8
Flushing All Cache Entries 9-8
Displaying DDP Statistics 9-11
Displaying RTMP Information 9-13
Displaying ZIP Information 9-14
Displaying NBP Information 9-16
PPENDIX
A
T
ECHNICAL SUPPORT
On-line Technical Services A-1
3Com Bulletin Board Service A-1
Access by Modem A-1
Access by ISDN A-2
World Wide Web Site A-2
ThreeComForum on CompuServe A-2
3ComFacts Automated Fax Service A-2
Support from Your Network Supplier A-3
Support from 3Com A-4
Returning Products for Repair A-4
I
NDEX
A
BOUT
T
HIS
G
UIDE
Introduction
Audience description
How to Use This Guide
The
LANplex 6000 Extended Switching User Guide
the features included with the LANplex Extended Switching software. These
features include IP, IPX, and AppleTalk routing.
You will use this guide with the
Guide
when you work with the Administration Console.
This guide is intended for the system or network administrator who is
responsible for configuring, using, and managing the LANplex 6000 system. It
assumes a working knowledge of local area network (LAN) operations and a
familiarity with communications protocols used on interconnected LANs.
If the information in the release notes shipped with your product differs from
the information in this guide, follow the release notes.
The following table shows where to find specific information.
If you are looking for... Turn to...
An overview of Extended Switching features Chapter 1
Information on how to install Extended Switching software Chapter 2
An overview of routing in the LANplex system Chapter 3
An overview of IP routing Chapter 4
An overview of IPX routing Chapter 5
An overview of AppleTalk routing Chapter 6
Information on how to administer IP routing Chapter 7
Information on how to administer IPX routing Chapter 8
Information on how to administer AppleTalk routing Chapter 9
Information on Technical Support Appendix A
LANplex 6000 Administration Console User
provides information about
2
A
BOUT THIS GUIDE
Conventions
Table 1 and Table 2 list conventions that are used throughout this guide.
Table 1
Notice Icons
Icon Type Description
Information Note Information notes call attention to important features or
instructions.
Caution Cautions alert you to personal safety risk, system damage,
or loss of data.
Warning Warnings alert you to the risk of severe personal injury.
Table 2
Text Conventions
Convention Description
“Enter” vs. “Type” When the word “enter” is used in this guide, it means type something, then press the
Return or Enter key. Do not press the Return or Enter key when an instruction simply
says “type.”
“Syntax” vs. “Command” When the word “syntax” is used in this guide, it indicates that the general form of a
command syntax is provided. You must evaluate the syntax and supply the
appropriate port, path, value, address, or string; for example:
The following syntax specifies the time and date:
mm/dd/yy hh:mm:ss
When the word “command” is used in this guide, it indicates that all variables in the
command have been supplied and you can enter the command as shown in text; for
example:
The following command enables Spanning Tree:
bridge stpState enabled
Text represented as
display
Text represented as
commands
screen
This typeface
is used to represent displays that appear on your terminal screen,
for example:
Login:
This typeface
bridge stpState disabled
is used to represent commands that you enter, for example:
(continued)
LANplex 6000 Documentation
Table 2 Text Conventions (continued)
Convention Description
Keys When specific keys are referred to in the text, they are called out by their labels, such
as “the Return key” or “the Escape key,” or they may be shown as [Return] or [Esc].
If two or more keys are to be pressed simultaneously, the keys are linked with a plus
sign (+), for example:
Press [Ctrl]+[Alt]+[Del].
Italics Italics are used to denote new terms or emphasis.
3
LANplex 6000
Documentation
The following documents comprise the LANplex 6000 documentation set.
If you want to order a document that you do not have or order additional
documents, contact your sales representative for assistance.
LANplex 6000 Unpacking Instructions
■
Describe how to unpack your LANplex system. It also provides you with
an inventory list of all the items shipped with your system. (Shipped
with system)
■
LANplex 6000 Software Release Notes
Provide information about the software release, including new features and
bug fixes. It also provides information about any changes to the LANplex
system’s documentation. (Shipped with system)
■
LANplex 6000 Planning Your Site
Provides information on the planning requirements you should consider
when preparing your site for a LANplex 6000 system. (Shipped with
system/Part No. 801-00251-000)
■ LANplex 6000 Getting Started
Describes all the procedures necessary for installing, cabling, powering up,
configuring management access to, and troubleshooting your LANplex system. (Shipped with system/Part No. 801-00252-000)
■ LANplex 6000 Operation Guide
Provides information to help you understand system management and
administration, bridging, FDDI technology, and Token Ring technology. It
also describes how these concepts are implemented in the LANplex system.
(Shipped with system/Part No. 801-00253-000)
4 ABOUT THIS GUIDE
■ LANplex 6000 Administration Console User Guide
Provides information about using the Administration Console to configure
and manage your LANplex system. (Shipped with system/Part No.
801-00254-000)
■ LANplex 6000 Extended Switching User Guide
Describes how the routing protocols are implemented in the LANplex
system and provides information about using the Administration Console to
configure and manage your routing protocols. (shipped with the option
package/Part No. 801-257-000)
■ Command Quick Reference for the 6000 Administration Guide
Contains all of the Administration Console commands for the LANplex
system. (Shipped with the system/Part No. 801-000258-000)
■ LANplex 6000 Control Panel User Guide
Provides information about using the LANplex 6000 control panel to
configure and manage your LANplex system. (Shipped with system/Part
No. 801-00255-000)
Documentation Comments
Example: LANplex 6000 Planning Your Site
■ Module Installation Guides
Provide an overview, installation instructions, LED status information, and
pin-out information for the particular option module. (Shipped with individual modules)
Your suggestions are very important to us and will help make our
documentation more useful to you. Please email comments about this
document to 3Com at: sdtechpubs_comments@3Mail.3Com.com
Please include the following information when commenting:
■ Document title
■ Document part number (listed on back cover of document)
■ Page number (if appropriate)
Part No. 801-00128-000
Page 2-5 (chapter 2, page 5)
I
GETTING STARTED
Chapter 1 LANplex Extended Switching Features
Chapter 2 Installing Extended Switching Software
1
LANPLEX EXTENDED SWITCHING
F
EATURES
This chapter provides an overview of the Extended Switching software, and
describes the new enhanced Administration Console menus.
About LANplex Extended Switching
The LANplex Extended Switching software replaces your existing LANplex
software and adds new functionality to your system. Extended Switching
software contains all the features of standard LANplex software, in addition
to routing capabilities with the following protocol support:
■ IP Routing (an enhanced version of IP from the standard system software)
■ IPX Routing
■ AppleTalk Routing
For information on how to gain access to online help, to use scripts, and to
exit from the Administration Console, see the LANplex 6000 Administration
Console User Guide.
1-2 CHAPTER 1: LANPLEX EXTENDED SWITCHING FEATURES
Using Menus to Perform Tasks
Options
(These vary per
level of access.)
When you gain access to the Administration Console, the top-level menu
appears. The Extended Switching software contains two new top-level
menus (IPX and AppleTalk) and enhancements to the IP menu option:
Option Descriptions
Menu options:
-------------------------------------------------------------------system - Administer system-level functions
ethernet - Administer Ethernet ports
fddi - Administer FDDI resources
tokenring - Administer Token Ring Resources
bridge - Administer bridging
ip - Administer IP
ipx - Administer IPX
appletalk - Administer Appletalk
snmp - Administer SNMP
analyzer - Administer Roving Analysis
script - Run a script of console commands
logout - Logout of the Administration Console
Type ? for help.
--------------------------------------------------------------------
Select a menu option:
The following sections show the new and enhanced menus provided with
Extended Switching software. All other menu items appear in the LANplex
6000 Administration Console User Guide.
Using Menus to Perform Tasks 1-3
IP Menu From the ip menu, you can view information about and configure Internet
Protocol (IP) interfaces and routes. You can also administer the Address
Resolution Protocol (ARP), the Routing Information Protocol (RIP), UDP
Helper, IP Forwarding, and ping IP stations. See Figure 1-1. For example, to
define a new IP interface, you would enter ip at the top-level menu,
interface at the ip menu, then define at the interface menu.
Top-Level Menu ip menu interface menu
system
ethernet
fddi
tokenring
bridge forwarding
➧ ip
ipx ping
appletalk statistics static
snmp remove
analyzer flush
script default
logout noDefault
➧ interface
➧ route
➧ arp
➧ udphelper
rip route menu
display
define
modify
remove
display
arp menu
display
remove
flush
udphelper menu
display
define
remove
hopCountLimit
threshold
Figure 1-1 IP Menu Hierarchy
1-4 CHAPTER 1: LANPLEX EXTENDED SWITCHING FEATURES
IPX Menu From the ipx menu, you can view information about and configure Internet
Packet Exchange (IPX) interfaces, routes, and servers. You can also
administer the Routing Information Protocol (RIP), Enhanced RIP mode,
Service Advertising Protocol (SAP), and statistics. See Figure 1-2. For
example, to define a new IPX interface, you would enter ipx at the top-level
menu, interface at the ipx menu, then define at the interface menu.
Top-Level Menu ipx menu interface menu
system
ethernet
fddi
tokenring forwarding remove
bridge rip
ip enhanced route menu
➧ ipx
appletalk
snmp remove
analyzer flush
script
logout server menu
➧ interface
➧ route
➧ server
sap
➧ statistics
display
define
modify
display
static
display
static
remove
flush
statistics menu
summary
rip
sap
forwarding
Figure 1-2 IPX Menu Hierarchy
Using Menus to Perform Tasks 1-5
AppleTalk Menu From the appletalk menu, you can view information about and configure
Appletalk interfaces, routes, and zones. You can also administer the
Appletalk Address Resolution Protocol (AARP), Appletalk forwarding, and
statistics. See Figure 1-3. For example, to define a new appletalk interface,
you would enter appletalk at the top-level menu, interface at the
AppleTalk menu, then define at the interface menu.
Top-Level Menu appletalk menu interface menu
system
ethernet
fddi
tokenring zone
bridge forwarding route menu
ip checksum
ipx ping flush
➧ interface
➧ route
➧ aarp
➧ appletalk ➧ statistics
snmp aarp menu
analyzer
script remove
logout flush
display
define
remove
display
display
statistics menu
ddp
rtmp
zip
nbp
Figure 1-3 AppleTalk Menu Hierarchy
1-6 CHAPTER 1: LANPLEX EXTENDED SWITCHING FEATURES
2
INSTALLING EXTENDED
S
WITCHING SOFTWARE
This chapter explains how to install Extended Switching software onto your
system.
Refer to the LANplex 6000 Release Notes for the latest system software
installation information.
About Installing Software
Copying Software to a Hard Disk
When you upgrade to the Extended Switching Software, all configuration
information is preserved. You can install a new version from any host
running ftp.
CAUTION: To run LANplex Extended Switching Software, you must have the
LANplex Management Module Plus (LMM+) installed on your system. This
new software does not run on the original LMM.
To install or upgrade the system software, you must perform two tasks:
■ Copy the software from the diskette to your UNIX-based or DOS-based
computer’s hard disk.
■ Load the system software from your computer’s hard disk to flash memory.
The software is distributed for both UNIX and DOS platforms. The following
media types are used to distribute software releases:
■ UNIX tar format 3
■ DOS format 3
The software files are compressed on the media.
1
/2-inch double-sided, high-density 1.44 MB diskette
1
/2-inch double-sided, high-density 1.44 MB diskette
2-2 CHAPTER 2: INSTALLING EXTENDED SWITCHING SOFTWARE
Copying to UNIX The LANplex software for a UNIX-based hard disk is distributed on four
floppy diskettes. Diskettes #1, #2, and #3 contain the LANplex software.
Diskette #4 contains the SNMP MIBs.
The SNMP MIBs, on diskette #4, are provided so that you can compile on 3rd
party applications.
To copy software to a UNIX hard disk, follow the instructions below:
If the directory “/usr/lp6000R” does not exist on your computer, create the
directory before proceeding. If your “/usr” directory is full, you can use a
different directory. In this case, substitute the actual directory used for
“/usr” in this and subsequent examples.
1 Insert diskette #1 into a disk drive (these instructions assume drive fd0).
2 Extract the first part of the LANplex software file using the following
commands:
cd /usr/lp6000R
tar xvf /dev/rfd0
3 Remove diskette #1 using the following command:
# eject
4 Insert diskette #2 into a disk drive and extract the second part of the file
using the following commands:
tar xvf /dev/rfd0
5 Remove diskette #2 using the following command:
# eject
The following files should be in your current default directory:
■ README1
■ lp6000R00
■ lp6000R01
■ lp6000R02
■ restore_lpxR
Copying Software to a Hard Disk 2-3
6 Use the supplied script to decompress and restore the split file
(
lp6000R00, lp6000R01, and lp6000R02).
# ./restore_lpxR
See the README1 file for size and checksum information.
Copying to DOS The LANplex software for a DOS-based hard disk is distributed on two
floppy diskettes. Diskette #1 contains the LANplex software. Diskette #2
contains the SNMP MIBs.
The SNMP MIBs, on diskette #3, are provided so that you can compile on 3rd
party applications.
To copy software to a DOS hard disk, follow the instructions below:
If the directory “lp6000R” does not exist on your computer, create the
directory before proceeding.
1 Insert diskette #1 into a disk drive (these instructions assume drive B:).
2 Copy the system software file to the directory of your computer using the
following commands:
cd lp6000R
copy b:lp6000R.exe
The file lp6000R.exe is a self-extracting archive. It decompresses and creates
the loadable lanplex file.
3 Decompress the file using the following command:
lp6000R
This creates a file called lp6000R, which you can then load into flash
memory.
2-4 CHAPTER 2: INSTALLING EXTENDED SWITCHING SOFTWARE
Loading Software Before loading the system software on the LMM+, you must verify that the
host machine, which has a copy of the updated system software, is
connected to the system by one of the methods described in Chapter 3:
Configuring Management Access to the System in the LANplex 6000
Administration Console User Guide.
You can load the system software into flash memory while the system is
operating. You do not need to bring the system down. After the flash install is
completed, a reboot will put the newly-loaded software to use.
If you are loading software from a PC, the ftp server must be running on the
PC before beginning this procedure.
Top-Level Menu
➧ system
ethernet
fddi
tokenring
bridge
ip
ipx
appletalk
snmp
analyzer
script
logout
How long will a
software load take?
display
➧ softwareUpdate
baseline
serialPort
password
name
time
screenHeight
consoleLock
panelLock
ctlKeys
nvData
reboot
Loading software into flash memory takes approximately 10 to 15 minutes
to complete, depending on your network load.
To load the system software:
1 From the top level of the Administration Console, enter:
system softwareUpdate
You are prompted for the Host IP address, Install file path name, User name,
and Password. The current values are displayed in brackets [ ]. To use the
value in brackets, press [Return]. The password field does not display what
you enter.
2 Enter the IP address of the host machine from which you are installing the
software (such as a Sun workstation or PC).
In the following example, the IP address of the host is
192.9.200.96.
3 Enter the complete path and file name.
For DOS system syntax, you must precede the full pathname with a forward
slash (/). For example, if you are loading software from a DOS host, enter the
following at the Install Filename prompt:
/c:\lp6000R\lp6000R
4 Enter your user name.
5 Enter your password. You must enter a value for this field.
Loading Software 2-5
See the following screen for an example of the software installation
prompts.
Host IP address [192.9.200.14]:192.9.200.96
Install file path name [/usr/
User name: ronnyk
Password:
lp6000R/lp6000R]:
After the software is loaded, you are notified that installation has been
completed:
Installation complete.
If the LANplex executable software image stored in Flash is corrupted (for
example, when a power failure occurs while you are updating software),
contact 3Com Technical Support, as described in Appendix A.
2-6 CHAPTER 2: INSTALLING EXTENDED SWITCHING SOFTWARE
II
ABOUT ROUTING PROTOCOLS
Chapter 3 Routing and the LANplex System
Chapter 4 Routing with IP
Chapter 5 Routing with IPX
Chapter 6 Routing with AppleTalk
3
ROUTING AND THE LANPLEX
S
YSTEM
This chapter shows how the LANplex system operates in a subnetted
routing environment and describes the LANplex routing methodology —
specifically, how the LANplex bridging and routing model compares with
traditional models.
What is Routing? Routing is the process of distributing packets over potentially dissimilar
networks. A router (also called a gateway) is the machine that accomplishes
this task. Routers are typically used to:
■ Connect enterprise networks together
■ Connect subnets (client/server networks) to the enterprise network
Figure 3-1 shows where routes are typically used in a network.
The LANplex system performs routing that connects subnets to the
enterprise network, providing connectivity between devices within a
workgroup, department, or building.
3-2 CHAPTER 3: ROUTING AND THE LANPLEX SYSTEM
Sales
LANplex in a
Environment
Connecting
enterprise
networks
Router
Bridge Bridge Bridge Bridge
Router
FDDI Backbone
Router
Engineering
Figure 3-1 Traditional Architecture of a Routed Network
The LANplex system allows you to fit Ethernet switching capability into
Subnetted
highly subnetted environments. When you put the LANplex system
into a subnetted network, it streamlines your network architecture and
easily switches traffic between and within subnets over Ethernet and
FDDI. See Figure 3-2.
Router
Connecting
subnets to the
enterprise
Marketing
Bridge
Sales
Router
FDDI backbone
LANplex
Engineering
LANplex
Figure 3-2 Subnetted Architecture with LANplex Switching Hubs
Marketing
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