HP 10:10 LAN Bridge MB Installation and operating manual

Printed in Singapore 4/98
Manual Part Number
28673-90001
*28673-90001*
Technical information in this document
is subject to change without notice.
©Copyright Hewlett-Packard Company
1990, 1992, 1998. All rights reserved. Reproduction,
adaptation, or translation without prior
written permission is prohibited except
as allowed under the copyright laws.
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HP 10:10 LAN Bridge MB
Installation and
Reference Guide
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HP 10:10 LAN Bridge MB
Installation and Reference Guide

Copyright Hewlett-Packard Company 1992. All rights reserved.
Hewlett-Packard Company makes no warranty of any kind with regard to this material, including, but
not limited to, the implied warranties of merchantability and fitness for a particular purpose.
Hewlett-Packard shall notbe liable for errors contained herein or for incidental or consequential
damages in connection with the furnishing, performance, or use of this material.
This document contains proprietary information, which is protected by copyright. No part of this
document may be photocopied, reproduced, or translated into another language without the prior
written consent of Hewlett-Packard. The information contained in this document is subject to change
without notice.
Safety Considerations
The product and related documentation must be reviewed for familiarization with safety markings and
instructions before installation and operation. See the documentation section entitled “Safety
Information”.
Informations concernant la sécurité
Ce produit et la documentation s’y rapportant devront être étudiés avant l’installation et l’utilisation,
afin de se familiariser avec les symboles et instructions de sécurité. Reportez-vous à la section
«Informations concernant la sécurité».
Hinweise zur Sicherheit
Sehen Sie sich das Produkt an und lesen Sie die begleitende Dokumentation, damit Sie vor der
Installation und dem Betrieb mit den Sicherheitsmarkierungen und Anleitungen vertraut sind. Bitte
lesen Sie das Kapitel mit der Überschrift “Hinweise zur Sicherheit”.
Considerazioni sulla sicurezza
Esaminare il prodotto e la relativa documentazione per familiarizzarsi con gli avvisi e le istruzioni di
sicurezza prima dell’installazione e dell’uso. Vedere la sezione di questo documento intitolata
“Considerazioni sulla sicurezza”.
Consideraciones sobre seguridad
Antes de instalar y hacer funcionar el producto, se deben estudiar el producto y la documentación
relacionada a fin de familiarizarse con las indicaciones de advertencia e instrucciones. Ver la sección
del documento titulada “Consideraciones sobre seguridad”.

HP 28673A
HP 10:10 LAN Bridge MB
Installation and Reference Guide
HP Part Number: 28673-90001
March 1992
Edition 2
E0392

In This Guide
This guide contains information to help you install, configure, and troubleshoot your
HP 28673A 10:10 LAN Bridge MB. The guide is organized as follows:
Chapter 1 provides a brief introduction to the bridge. It describes important product features,
what you should have received with your bridge, and an overview of how the bridge works.
Chapter 2 provides bridge installation instructions. It describes, in detail, the steps that you
should follow to install the bridge.
Chapter 3 describes all the bridge’s console interface commands.
Chapter 4 contains troubleshooting information. If you experience problems with the bridge,
you should refer to this chapter.
Appendix A provides information on the cables and connectors that you should use to connect
the bridge to the other devices in your network.
Appendix B contains the technical specifications for the bridge.
Appendix C describes how to configure commonly found modems for use with the bridge’s
console connection.
Appendix D provides information on network addressing for those using SNMP network
management stations to manage the bridge over an IP or IPX network.
Appendix E provides a lists of Ethernet packet types and vendor codes to help you configure
the bridge to perform certain types of packet filtering.
Safety Information contains safety information about the bridge. You should read and
understand this information before you use the product.
2

Contents
1 Introducing the HP 10:10 LAN Bridge MB
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Included Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Front of the Bridge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Status LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Back of the Bridge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
Bridge Status LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
Port Status LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
Reset and Clear Buttons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
2 Installation
Installation Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
1. Mount the bridge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
2. Connect the networks to the bridge . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
Using the AUI Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
Using the ThinLAN Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
3. Plug in the bridge and verify . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
4. Customize the bridge’s configuration (if needed) . . . . . . . . . . . . . . . . . . 2-9
3 Configuration
Starting a Console Session . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Connecting a Terminal Directly . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Connecting a Modem and Terminal . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
If You Have Trouble with a Terminal or Modem Connection . . . . . . . . . . . . 3-4
Configuration Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
ADdress Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
IP config . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
OPerating State . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8
WIldcard Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9
3

4 Operation
Console Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
Main Menu Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
Config Mode Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7
Status Mode Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-8
Resetting the Bridge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-11
Effects of the Reset Methods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-11
Executing the Reset Methods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-13
Clearing the Bridge Password . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-14
5 Troubleshooting
Basic Troubleshooting Tips . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
Diagnosing With the LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2
Diagnostic Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4
Testing the Bridge Only . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4
Testing the Bridge and LANs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-5
Testing the Network Links . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-6
6 How the Bridge Works
The Bridging Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1
Operating State . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2
Address Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3
Wildcard Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-5
Spanning Tree Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-6
Automatic Network Verification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-8
Firmware Enhancements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-9
Network Management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-9
A Cables and Connectors
HP Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-2
Other Standard Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-3
Thin LAN Cable Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-4
AUI Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-4
4

Console Connector and Cable Pin-Outs . . . . . . . . . . . . . . . . . . . . . . . . . A-5
Pin-Out for Bridge’s Console Port Connector . . . . . . . . . . . . . . . . . . . . A-5
RS-232-C “Crossover” Cable (for Terminal/PC with 25-Pin Connector) . . . . . . A-6
RS-232-C “Crossover” Cable (for Terminal/PC with 9-Pin Connector) . . . . . . . A-6
RS-232-C Cable for HP 110 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-7
Null-Modem Adapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-7
RS-232-C Modem Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-8
Loopback Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-9
For AUI Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-9
For ThinLAN Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-9
For Console Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-9
B Product Specifications
C Modem Configuration
HP 35031A Support Link II . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-1
HP 50759A Support Link . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-1
HP 37212B Support Link . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-1
Black Box V.32 9600 Async. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-2
Hayes 1200 Smartmodem (for both 8-and 10-switch units) . . . . . . . . . . . . . C-2
Racal Vadic Maxell 2400 VP (Hayes 2400 Compatible) . . . . . . . . . . . . . . . C-2
D Network Addressing
IPX Addressing for Novell NetWare . . . . . . . . . . . . . . . . . . . . . . . . . . . D-1
IP Addresses for TCP/IP Networks . . . . . . . . . . . . . . . . . . . . . . . . . . . D-2
Using Assigned IP Addresses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-2
Building Your Own IP Addressing Scheme . . . . . . . . . . . . . . . . . . . . . D-3
E Ethernet Packet Types and Vendor Codes
Safety Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Safety-1
Regulatory Statements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Regulatory-1
One-Year Limited Hardware Warranty . . . . . . . . . . . . . . . . . . . . . . . Waranty-1
Glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Glossary-1
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Index-1
5

1
Introducing the HP 10:10 LAN Bridge MB
The HP 10:10 LAN Bridge MB (28673A) is a “media-speed” network bridge that connects two
independent IEEE 802.3 or Ethernet local area networks (LANs) to create one logical extended
LAN. This extended LAN gives you direct access to all compatible resources on the two
LANs. Figure 1-1 depicts a simple extended LAN using the HP 10:10 LAN Bridge MB.
The bridge performs these functions:
Extends communications beyond the length limitations of a single LAN.
Provides data packet filtering that inhibits the flow of unnecessary 802.3/Ethernet data
packets (MAC frames) from one network to another, eliminating the waste of valuable
bandwidth.
Provides parity checking and improved data integrity by verifying the cyclic
redundancy checksum (CRC) for each frame received.
For more detailed information on how the bridge performs its functions, see chapter 6, “How
the Bridge Works”.
LAN A
LAN B
HP 10:10 LAN Bridge MB
Nodes on LAN A
Nodes on LAN B
Figure 1-1. Extended LAN
Introducing the HP 10:10 LAN Bridge MB 1-1

Features
The HP 10:10 LAN Bridge MB has these features:
Filters and forwards packets as fast as the network can operate (media-speed
performance).
Automatically learns the addresses and locations of the nodes on the attached LANs.
Has a configurable address table that holds up to 512 station addresses (also called
MAC addresses, Ethernet addresses, or physical addresses).
Has a secure mode to control communications between nodes.
Supports the IEEE 802.1 spanning tree protocol for networks with multiple paths
between nodes.
Has 128 Kbytes of memory for buffering packets.
Automatically recovers from power failure while maintaining its configuration.
Has LEDs on the front and back that are easy to read and interpret.
Has both AUI and BNC connectors, enabling attachment to thin coax, thick coax,
fiber-optic, or twisted-pair LAN media.
Automatically detects which port 1 connector, AUI or BNC, is being used.
Has an RS-232-C port for connecting a console to customize the bridge’s configuration,
to monitor bridge activity and status, and to run diagnostic tests. Console access can be
either local, by attaching an ASCII terminal or PC directly to the console port, or
remote, by attaching a modem to the console port.
Has a power supply that automatically adjusts to the voltage range of the ac power being
supplied to the bridge (90-120 volts or 200-240 volts). No voltage range setting or fuse
change is needed.
Has a factory assigned station address allowing the bridge to respond to 802.2 Test
packets. The bridge can also be configured with an IP address and can respond to an
ICMP Echo Request message (also called “Ping”).
1-2 Introducing the HP 10:10 LAN Bridge MB

Features (continued)
Can be managed remotely from a network management station that supports SNMP
over IP (using the configured IP address) or IPX. (See “Network Management” in
chapter 6, “How the Bridge Works”.)
Can be downloaded with new firmware enhancements either from a PC attached to the
console port or over the network. (See “Firmware Enhancements” in chapter 6, “How
the Bridge Works”.)
Comes with metal brackets that can be easily attached to the bridge for mounting it in a
standard 19-inch telco rack or on a wall.
Included Parts
These parts are included with the HP 10:10 LAN Bridge MB product:
HP 10:10 LAN Bridge MB (HP 28673-60002).
Accessories kit (28673-60006), including:
–two mounting brackets (5001-5624).
–four 10-mm M4 screws (0515-0780).
–four 5/8-in. 10-32 screws (2680-0302).
–two AUI retainers (5062-3351).
–four self-adhesive rubber feet (0403-0427).
–BNC insulating cover (1252-1650).
HP 10:10 LAN Bridge MB Installation Quick Reference (28673-90002).
HP 10:10 LAN Bridge MB Installation and Reference Guide (28673-90001).
Power cord (one of the following)
–United Kingdom (8120-1351).
–Australia (8120-1369).
–Europe (8120-1689).
–United States/Canada 125V (8120-1378).
–United States/Canada 250V (8120-0698).
–Switzerland (8120-2104).
–Denmark (8120-2956).
–Japan (8120-4753).
Introducing the HP 10:10 LAN Bridge MB 1-3

Front of the Bridge
Status LEDs
See chapter 5, “Troubleshooting”, for information on using these LEDs to diagnose errors.
~Line On (green) is ON if the bridge is receiving power.
Activity (green) flashes ON for each data packet that is received or transmitted. The frequency
of flashes indicates the amount of traffic. In heavy traffic, it may look like it is ON all the time.
Fault (yellow) is ON if the bridge or network has failed during self-test or normal operation.
Status LEDs
1-4 Introducing the HP 10:10 LAN Bridge MB

Back of the Bridge
Bridge Status LEDs
See chapter 5, “Troubleshooting”, for information using these LEDs to diagnose errors.
Pwr – power (green) is ON if the bridge
is receiving power and if power is being
supplied to internal and external transceivers.
Self-test (green) is ON when a self-test is
executing on the bridge. This occurs when
the bridge has just been powered on,or a
bridge reset is in progress. If an error is
found during self-test, this LED stays ON
and the Fault (and possibly Net Fail) LED
will go ON.
Fault (yellow) is ON if the bridge or network has failed during reset or normal operation.
(This LED is repeated on the front.) If this LED is ON and one of the Net Fail LEDs is also
ON, the failure is associated with the network. If this LED is ON and a Net Fail LED is not
ON, the bridge itself is at fault.
Status LEDs
Reset button
Clear button
Port 1 ThinLAN
Console port
Port 1 AUI
Port 2 AUI
power
Introducing the HP 10:10 LAN Bridge MB 1-5

Port Status LEDs
See chapter 5, “Troubleshooting”, for information using these LEDs to diagnose errors.
Net Fail (yellow) is ON if a failure has occurred that is associated with the network or the LAN
ports. (There is one Net Fail LED for each network port.) If this LED is ON during a self-test,
this most likely indicates an external loopback error. This could be caused by a bad or
improperly connected LAN cable or transceiver.
If this LED goes ON during normal operation, this indicates that the bridge has lost the carrier
signal on the indicated port. This could be caused by a LAN cable or transceiver becoming
disconnected or inoperative.
Transmit (green) flashes ON for each packet that is transmitted. The frequency of flashes
indicates the amount of traffic. In heavy traffic, it may look like it is ON all the time.
Receive (green) flashes ON for each packet that is received. The frequency of flashes indicates
the amount of traffic. In heavy traffic, it may look like it is ON all the time.
ThinLAN Enabled or AUI Enabled (green) is ON indicating which of the Port 1 connectors is
active. During its power-on self-test, the bridge automatically detects which Port 1 connector is
being used. Only one of these connectors can be used at a time to connect the bridge to the
LAN.
Reset and Clear Buttons
Two buttons for resetting the bridge are located on the back near the LEDs. These two buttons
have different effects on the bridge. Their functions are described in chapter 4, “Operation”,
under “Resetting the Bridge.”
The button labeled Reset protrudes slightly from the back of the bridge and you can press it
with your finger. The button labeled Clear is recessed and you must use a pointed,
non-conductive tool (like a toothpick) to press it.
Caution The Clear button should be used with care. When pressed by itself, it erases the
bridge access password (if one has been configured). See “Clearing the
Password” in chapter 4. When used simultaneously with the Reset button, it can
erase all changes you have made to the bridge’s configuration. See “Resetting
the Bridge” in chapter 4.
1-6 Introducing the HP 10:10 LAN Bridge MB

2
Installation
This chapter describes how to install and configure the HP 10:10 LAN Bridge MB, and verify
that it is operating correctly.
Installation Summary
The steps to install the HP 10:10 LAN Bridge MB are:
1. Mount the bridge (in a rack, on a wall, or on a table).
2. Connect the bridge to the networks.
3. Plug in the bridge and verify its operation.
4. Customize the bridge’s configuration if necessary (for example, because you want to
enter static addresses into the bridge’s address table, or because the bridge will be
managed remotely from a network management station on an IP network).
The details for these steps are provided in the rest of this chapter.
Tools and equipment needed for mounting the bridge in a rack or on the wall:
Phillips (cross-head) number 1 screwdriver (for rack or wall mounting)
four 5⁄8-inch number 12 wood screws or equivalent (for wall mounting only)
Installation 2-1

1. Make sure the bridge’s power cord is correct for your country’s ac power supply. Do
not plug the power cord into the power supply until the bridge is mounted. (Note that
the bridge does not have a power switch; the bridge is powered on when the power cord
is plugged in.)
2. As described on the next page, mount the bridge in a rack or on a wall by using the
mounting brackets, or place it on a table.
Before mounting the bridge, plan its location and orientation relative to other devices and
equipment. Also consider management of the cabling you will be attaching and consider access
to the ports you will be using. In the example below, the bridge is mounted in a rack with other
HP EtherTwist family devices and a cable guide unit. Order the HP EtherTwist LAN Rack (HP
46298D) and the Cable Guide (HP 35199D).
1. Mount the bridge
Thin coaxial cable
backbone
Cable guide
Standard 19-inch
telco rack
HP network
devices; hubs,
bridges, etc.
2-2 Installation

For Rack or Cabinet Mounting:
1. Using a Phillips or cross-head screwdriver, attach the mounting brackets to the bridge
with 10-mm M4 screws (included in accessory kit). Note that the bridge’s case and the
mounting brackets are designed to allow you to rack mount the bridge with either the
back or the front facing out.
2. Position the bridge in the rack or cabinet and slide it up or down until the rack holes line
up with the bracket holes. Then attach the bridge to the rack with 5⁄8-inch number
12-24 screws (included in the accessory kit). (Some cabinets require number 10-32
screws instead, available as p/n 2680-0302. Make sure you have screws that fit your
cabinet or rack before mounting the bridge.)
Mounting bracket
Front facing out
10-mm M4 screws
Mounting bracket
Back facing out
5⁄8-inch number
12-24 screws
Installation 2-3

For Wall Mounting: Using a Phillips or cross-head screwdriver, attach the mounting
brackets to the bridge with 10-mm M4 screws (included in the accessories kit). Then attach the
bridge to a wood surface (minimum 1⁄2-in. plywood or equivalent) with 5⁄8-inch number 12
wood screws or equivalent (not included).
For Table Mounting: Attach the self-adhesive rubber feet to the bottom of the bridge. Set
the bridge on a table near a power source.
Mounting bracket
Flat on wall
10-mm M4 screws
Mounting bracket
Straight out from wall
10-mm M4 screws
2-4 Installation

Attach the network cables to the bridge port 1 and port 2 connectors using the appropriate
transceivers. Use only one of the Port 1 connectors, (BNC or AUI). The bridge automatically
detects which port is being used.
Caution To reduce the possibility of damage to the bridge, any time you are
connecting or disconnecting the port cables, you should first make sure the
bridge’s power cord is unplugged. Plug the power cord back in after the
cables are reconnected.
The HP 10:10 LAN Bridge MB connects to networks in these ways:
To a thin coax, thick coax, fiber-optic, or twisted-pair cable network through
transceivers attached to the bridge’s AUI connectors. (The illustration above shows the
use of compact transceivers, available from Hewlett-Packard, that attach directly to the
AUI connector and do not require the use of an AUI cable.)
Directly to a thin coax cable network through the ThinLAN BNC connector (the bridge
has an internal transceiver for the BNC connector).
2. Connect the networks to the bridge
OR
LAN cable
LAN cable
Port 2
AUI
Port 1
ThinLAN
transceiver
BNC “T”
LAN cable
LAN cable
transceivers
Port 2
AUI
Port 1
AUI
Installation 2-5

Using the AUI Connectors
1. Slide the AUI retainer (included)
onto the connector posts on a
transceiver or an AUI cable.
2. Plug the transceiver or AUI cable
into the AUI port on the bridge and
secure it with the retainer’s screws.
Tighten the screws until they are snug;
do not overtighten them.
3. Attach the network cable to the
transceiver.
Note The Signal Quality Error (SQE) Test signal can be either enabled or disabled on
a transceiver attached to the bridge. The bridge ignores SQE Test signals.
AUI port on
bridge
transceiver
or AUI cable
AUI retainer
connector post
2-6 Installation