Digital Equipment DECbridge 90FL Manuale utente
DECbridge90FL
Owner’sManual
Order Number: EK-DEWGF-OM. A01
Revision/Update Information: This is a new manual.
Digital Equipment Corporation
Maynard, Massachusetts
First Edition, August 1992
The information in this document is subject to change without notice and should not be construed
as a commitment by Digital Equipment Corporation. Digital Equipment Corporation assumes no
responsibility for any errors that may appear in this document.
The software described in this document is furnished under a license and may be used or copied
only in accordance with the terms of such license.
No responsibility is assumed for the use or reliability of software on equipment that is not supplied
by Digital Equipment Corporation or its affiliated companies.
Restricted Rights: Use, duplication, or disclosure by the U.S. Government is subject to restrictions
as set forth in subparagraph (c) (1) (ii) of the Rights in Technical Data and Computer Software
clause at DFARS 252.227-7013.
© Digital Equipment Corporation 1992.
All Rights Reserved.
Printed in U.S.A.
FCC NOTICE: The equipment described in this manual generates, uses, and may emit radio
frequency energy. The equipment has been type tested and found to comply with the limits for
a Class A computing device pursuant to Subpart J of Part 15 of FCC Rules, which are designed
to provide reasonable protection against such radio frequency interference when operated in a
commercial environment. Operation of this equipment in a residential area may cause interference,
in which case the user at his own expense may be required to take measures to correct the
interference.
The following are trademarks of Digital Equipment Corporation: BI, DEC, DECbridge, DECconnect,
DECmcc, DECnet, DECserver, Digital, LAT, MicroVAX, ThinWire, ULTRIX, UNIBUS, VAX,
VAX–11/780, VAX–11/785, VAX 3600, VAX 3900, VAX 6000, VAX 6300, VAX 6400, VAX 9000,
VAXcluster, VAX DOCUMENT, VAXELN, VAXstation, VMS, VT, and the DIGITAL logo.
This document was prepared using VAX DOCUMENT, Version 2.0.
Contents
About This Manual...................................... vii
1 Overview
Features ............................................. 1–1
Description ........................................... 1–1
DECbridge 90FL Front Panel Lights and Switches ............ 1–3
2 Configuring the DECbridge 90FL
Supported Configurations. ............................... 2–4
3 Installation
Power Supply . . ....................................... 3–1
Site Considerations .................................... 3–1
Standalone Installation . . ............................... 3–2
Mount the DECbridge 90FL on a Wall ................... 3–4
Make Connections for Standalone Installations ............ 3–6
Backplane Installation . . . ............................... 3–9
Insert the DECbridge 90FL into the DEChub 90
Backplane . ....................................... 3–9
Make Connections for Backplane Installations ............ 3–11
4 Managing the DECbridge 90FL
DECbridge 90FL Operation .............................. 4–1
DECbridge 90FL Functions ........................... 4–2
Spanning Tree Algorithm ............................. 4–3
Spanning Tree Algorithm Properties .................... 4–3
MOP............................................. 4–3
MOP Functions .................................... 4–4
Accessing MOP from VMS Systems ..................... 4–4
iii
Accessing MOP from ULTRIX Systems . . . ............... 4–6
Console Carrier User Interface . ....................... 4–6
Console Carrier Command Language....................... 4–7
Description of Command Parameters .................... 4–9
Description of Commands ............................ 4–10
Protocol Filtering Examples ........................... 4–17
Remote Bridge Management Software (RBMS) ............ 4–19
Error Messages ....................................... 4–20
5 Troubleshooting
Customer Services Option ............................... 5–5
A Specifications and Parts List
Parts List ............................................ A–3
B Related Documentation
Ordering Information ................................... B–1
Continental USA and Puerto Rico ................... B–1
New Hampshire, Alaska, and Hawaii . ............... B–1
Outside the USA and Puerto Rico ................... B–2
Digital Personnel . ............................... B–2
Index
Figures
1–1 Sample DECbridge 90FL Connection .............. 1–3
1–2 Indicators and Connectors ...................... 1–4
2–1 DECbridge 90FL Configured to Fiber-Optic
Backbone ................................... 2–2
2–2 DECbridge 90FL Configured to AUI Backbone ...... 2–3
2–3 Work Group With More Than 200 Stations . . . ...... 2–5
2–4 Redundant Connections . ....................... 2–6
2–5 Bridges in the Work Group ..................... 2–7
2–6 Multiple Bridges in Work Group . . ............... 2–8
3–1 Standalone Installation . ....................... 3–3
3–2 Removing the Back Cover ...................... 3–5
iv
3–3 Connecting Transceiver Cables . . . ............... 3–7
3–4 Connecting to the Middle of a ThinWire Segment .... 3–8
3–5 Connecting to the End of a ThinWire Segment ...... 3–8
3–6 Installing the DECbridge 90FL in DEChub 90
Backplane . . . ............................... 3–10
Tables
4–1 Ethernet Circuit Names for Systems ............. 4–5
4–2 Summary of DECbridge 90FL Commands .......... 4–7
4–3 Protocol Type Codes and Names . . ............... 4–17
4–4 DECbridge 90FL Error Messages. . ............... 4–20
5–1 Activity Indicators (LEDs) ...................... 5–2
5–2 Simple Troubleshooting . ....................... 5–4
A–1 Physical Dimensions . . . ....................... A–1
A–2 Operating Environment . ....................... A–2
A–3 Shipping Environment . . ....................... A–2
A–4 Power Specifications........................... A–2
A–5 Standalone Installation Kit Contents .............. A–3
A–6 DEChub 90 Backplane Installation Kit Contents ..... A–3
v
About This Manual
This manual provides an overview of the DECbridge 90FL unit and describes
how to configure, install, operate, manage, and troubleshoot the DECbridge 90FL.
This manual also provides the specifications and lists the related documentation
for the DECbridge 90FL.
In this manual, the DECbridge 90FL unit may be referred to as the DECbridge 90FL,
work group bridge,bridge,orWGB.
Organization
This manual has five chapters, two appendices, and an index.
Chapter Description
1 Provides an overview of the DECbridge 90FL, including fea-
tures, description of front panel indicators, and configurations
2 Provides configuration rules for the DECbridge 90FL
3 Describes how to install the DECbridge 90FL
4 Describes how to manage the DECbridge 90FL through the
Maintenance Operations Protocol (MOP) or Network Control
Program (NCP)
5 Describes how to troubleshoot the DECbridge 90FL
Appendix A Describes the physical dimensions, the environmental,
electrical, and power specifications, and provides a parts
list
Appendix B Provides a list of related documentation and ordering
information
vii
Conventions
This manual uses the following conventions:
Convention Meaning
Note Provides general information
boldface type Boldface type in examples indicates user input. For example:
DECbridge> SET PROTOCOL
parameters Parameters are italicized. For example:
SHOW PORT slot number
[] Characters within brackets represent optional parameters. For
example:
SHOW PORT [hub number,slot number]
viii
1
Overview
The DECbridge 90FL unit offers a reliable, high-performance, easy-to-install
means of connecting two local area networks (LANs). Configured as a standalone
unit or in the DEChub 90 backplane, the DECbridge 90FL provides greater
network reliability and efficiency by allowing the local area network to be
partitioned into a number of smaller LANs.
Features
The following list summarizes the main features of the DECbridge 90FL:
• Easy-to-use
• Plug-and-go installation
• Activity LEDs for easy diagnosis
• Small size
• Rack-mountable in DEChub 90 backplane
• Frame filtering and frame forwarding at full
network throughput
• Protocol filtering
• Support of spanning tree
algorithm
• Management through Maintenance
Operations Protocol (MOP)
console carrier
• Support of Remote Bridge
Management Software (RBMS)
• Fiber-optic link ports (10Base-FL)
and 15-pin AUI Ethernet
interfaces
Description
The DECbridge 90FL is a specialized LAN device that connects two Ethernet
or IEEE 802.3 LANs to form a single extended local area network (Figure 1–1).
One LAN, referred to as the backbone, can consist of an unrestricted number of
stations. The other LAN, referred to as the work group, is usually the smaller
of the two LANs and is optimized for LANs of fewer than 200 stations.
Overview 1–1
When the work group consists of fewer than 200 stations, the DECbridge 90FL
automatically prevents unnecessary traffic from being transmitted from one
LAN to the other. When there are more than 200 stations in the work group,
the DECbridge 90FL enters flood mode, which reduces the effectiveness of
the traffic isolation, but ensures full connectivity across the bridge. (Refer to
Chapter 4, Management, for further information about flood mode.)
The DECbridge 90FL provides the network manager with additional control over
traffic distribution through protocol filtering and repeater management features.
All stations connected within the extended LAN communicate with one another
as if they were all on the same LAN. The connected LANs will work in networks
using equipment designed to be compatible with the Ethernet or IEEE 802.3
standards. The DECbridge 90FL connects to the work group using a ThinWire
(10Base2) integral transceiver. The backbone connections are made through one
of two user-selectable interfaces: fiber-optic interface (10Base-FL) or 15-pin AUI
Ethernet (10Base5) interface.
The 10Base-FL standard, which is an improved version of the original Fiber
Optic Inter Repeater Link (FOIRL) standard, allows backward compatibility of
the 10Base-FL bridge with a FOIRL transceiver. Bridge operation is transparent
to other stations on the LAN. No special software is required on any station.
Figure 1–1 shows a sample DECbridge 90FL connection.
1–2 Overview
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