Allied Telesis CentreCOM AT-3675 Bridge Manuale utente

Allied

Telesyn

CentreCOM



AT-3675 Bridge

SNMP Manageable

User Manual



Allied Telesyn International, Corp.

Allied Telesyn International, Corp. reserves the right to make changes in specifications and other

information contained in this document without prior written notice. The information provided herein is

subject to change without notice. In no event shall Allied Telesyn International, Corp. be liable for any

incidental, special, indirect, or consequential damages whatsoever, including but not limited to lost profits,

arising out of or related to this manual or the information contained herein, even if Allied Telesyn

International, Corp. has been advised of, known, or should have known, the possibility of such damages.

Trademarks: CentreCOM is a registered trademark of Allied Telesyn International, Corp. Ethernet is a

registered trademark of Xerox Corporation. UNIX is a registered trademark of UNIX System

Laboratories. Novell and NetWare are registered trademarks of Novell, Inc. Microsoft and MS-DOS are

registered trademarks and LAN Manager and Windows for Workgroups are trademarks of Microsoft

Corporation. 3Com is a registered trademark of 3Com. PC-NFS is a trademark of Sun Microsystems, Inc.

PC/TCP is a registered trademark of FTP Software, Inc. DECnet is a registered trademark of Digital

Equipment Corporation.

Table Of Contents

Electrical Safety and Installation Requirements .....................................................i

Table Of Contents ..........................................................................................................xi

Chapter 1

Overview ........................................................................................................................... 1

CentreCOM AT-3675 SNMP-Manageable Bridge...................................................................................... 1

Performance ............................................................................................................................................... 1

Management............................................................................................................................................... 2

Physical Description........................................................................................................................................ 2

Features Summary.......................................................................................................................................... 3

Chapter 2

Installation ....................................................................................................................... 5

Site Selection..................................................................................................................................................... 5

Factory Configuration..................................................................................................................................... 5

Changing Configuration with Transceivers................................................................................................. 6

Switching Configuration with Jumpers........................................................................................................ 6

Upgrading Bridge Firmware......................................................................................................................... 8

Chapter 3

Operation .......................................................................................................................... 9

Power On........................................................................................................................................................... 9

Diagnostics........................................................................................................................................................ 9

Normal Operation............................................................................................................................................. 9

Backup Operation........................................................................................................................................... 10

Application Guidelines................................................................................................................................... 10

Fault Tolerance and Isolation....................................................................................................................... 14

Chapter 4

Troubleshooting ............................................................................................................ 17

Product Code and Serial Number................................................................................................................ 17

Appendix A

Data Cabling Techniques ............................................................................................ 19

xii

10BASE-T....................................................................................................................................................... 19

UTP Wiring

Specifications.................................................................................................................................. 19

10BASE-T Point-to-Point Cabling....................................................................................................... 20

10BASE-FL/FOIRL Ethernet ................................................................................................................... 23

10BASE2 (Thin) Ethernet........................................................................................................................... 23

10BASE5 (Thick) Ethernet ......................................................................................................................... 23

AUI Drop Cables.................................................................................................................................... 24

Appendix B

Glossary ............................................................................................................................25

Appendix C

Technical Support Fax Order .....................................................................................31

Incident Summary......................................................................................................................................... 31

Appendix D

CentreCOM AT-3675 Manual Feedback ....................................................................33

Index .................................................................................................................................35

Chapter 1

Overview

CentreCOM AT-3675 SNMP-Manageable Bridge

The CentreCOM

AT-3675 SNMP-Manageable Learning Bridge allows you

tointerconnect two Ethernet sub-networks.Eachsub-networkmaybeIEEE

802.3 10BASE2 (thin) Ethernet or 10BASE5 (thick) Ethernet or pre-802.3

Ethernet. Unshielded Twisted Pair (UTP) can also be connected to the bridge

through a transceiver. The AT-3675 bridge transparently forwards packets.

Since the bridge operates at the Media ACcess (MAC) level, all higher level

protocols, such as Transmission Control Protocol (TCP), DECnet™ and

NetWare®, are passed unaffected.

Performance The four repeater rule does not apply across the bridge. The effective length

of a Local Area Network (LAN) can be increased by adding a CentreCOM

AT-3675 SNMP-Manageable Learning Bridge. Placing bridges at natural

boundaries of the workgroups increases the network performance at each

segment by diminishing network trafﬁc. The reliability of a large network can

be enhanced by a bridge and allows sub-networks of different media types to

be interconnected.

The CentreCOM AT-3675 is self-learning, adjusting to reconﬁguration of sub-

nets to provide continuous isolation of local trafﬁc. The AT-3675 provides

packet ﬁltering at 25,000 Packets Per Second (PPS) and sustained forwarding

at 12,500 PPS. Its ﬁlter table supports 2,048 MAC-level station addresses.

Multiple AT-3675 bridges can be used as backups in case of network failure.

The AT-3675 supports the IEEE 802.1 Spanning Tree Protocol (STP), which

provides redundancy link management and network loop checking. STP

allows backup bridges to provide fault tolerant networks by placing the

bridges that form loops into a standby state until an active bridge fails. When

failure occurs, the network is reconﬁgured and any loops are eliminated. This

network reconﬁguration occurs without impacting the network users or the

applications.

Overview

Management Simple Network Management Protocol (SNMP) is supported by the AT-3675.

The bridge can be monitored and manipulated by many SNMP-compatible

management stations. Since it supports the second version of the

Management Information Base (MIB-II) and Bridge MIB, parameters of the

AT-3675 can be managed under SNMP including custom ﬁltering, static

forwarding entries and STP.

Physical Description

The AT-3675 bridge is housed in the slim-line chassis. All network

attachments, the power connector and status indicators are located on the

front panel. See Figure 1.

Media selection for the bridge’s A and B channels are controlled by jumper

blocks on the main board inside the chassis.

There are three pairs of indicators on the AT-3675 front panel. Two pairs

indicate network activity forChannels A and B. The third pair of indicators is

System Power and Diagnostics. The names of the indicators and their

functions are described in Table 1.

Table 1: AT-3675 Front Panel Indicators

The two 10BASE2 network connectors are standard Bayonet Nut Couples

(BNCs). The two 10BASE5 network connectors are standard Attachment

Unit Interfaces (AUIs) and accept standard 10BASE2, ﬁber optic

(10BASE-FL, FOIRL), 10BASE-T transceivers and 10BASE5 drop cables.

Since the AT-3675 bridge has the same dimensions as the AT-3600 Series

Repeaters, it may be mounted in an ATI rackmount or desktop chassis.

Indicator Function

Transmit A Channel A Transmitting

Receive A Channel A Receiving

Transmit B Channel B Transmitting

Receive B Channel B Receiving

Diagnostics Diagnostic Test Status

System Power Power is ON

Figure 1:

AT-3675 Front Panel

POWERSYSTEM ACTIVITY

Illumination indicates

line voltage available.

Indicator continually illuminated

during self test, then off.

Indicator will flash if error detected.

CHANNEL BCHANNEL B

TRANSMIT

RECEIVE

TRANSMIT

RECEIVE

10BASE2 10BASE5 DIAGNOSTICS

3675

CentreCOMTM

IEEE 802.3/ETHERNETBRIDGE

with SNMPManagement

CHANNEL A

10BASE2 10BASE5

CHANNEL A

SYSTEM POWER

CentreCOMAT-3675 SNMP-Manageable Learning Bridge

Not all chassis slots must be populated and populated slots need not be

contiguous. Table 2 lists chassis models available.

Table 2: Department Concentrators Chassis Available

Features Summary

❑Self -learning SNMP-Manageable Learning Bridge

❑Filter at 25,000 PPS

❑Forward at 12,500 PPS

❑Thinnet (for 10BASE2) and thicknet (for 10BASE5 or pre-802.3

Ethernet) media options on each network segment

❑Fiber optic (10BASE-FL, FOIRL) or UTP with the addition of an

optional transceiver(s)

❑Supports 2,048 MAC addresses in filter table

❑IEEE 802.1 revision D STP

❑Standalone, desktop, or rackmount, chassis installation

❑SNMP management

❑MIB-II and Bridge MIB (RFC 1493)

❑One year free software upgrades

❑One year warranty

Number of Modules Desktop Model Rackmount Model

1 AT-36E1 AT-36C1

2 AT-36E2 AT-36C2

3 AT-36E3 AT-36C3

4 AT-36E4 AT-36C4

8 AT-36E8 AT-36C8

Chapter 2

Installation

Before installing the CentreCOM AT-3675

SNMP-Manageable Learning

Bridge, check to see that the package contents are complete. If any of the

following items are missing or damaged, contact your sales

representative.

❑CentreCOM AT-3675 SNMP-Manageable Learning Bridge

❑User Manual

❑Warranty statement and registration cards

❑Power cord (U.S.A. version only)

Save the shipping carton and packing material in case you need to ship or

store the bridge in the future.

Site Selection

Before installing the AT-3675 bridge, read the safety installation

requirements starting on page i.

The AT-3675 bridge should be placed in a cool, well-ventilated area. Air vents

are located on each side of the bridge. It is very important that none of the

vents is obstructed. Several inches of clearance should be allowed between

these vents and any other object, e.g., a wall or other equipment.

Failure to follow these ventilation guidelines may result in overheating and

eventual damage of the bridge.

Factory Configuration

The AT-3675 bridge is conﬁgured at the factory to use the AUI ports on both

channels. The AUI connectors (labeled 10BASE5) are active. If you use the

bridge in anIEEE 802.3 10BASE5 (or a pre-802.3Ethernet) environment, no

additional conﬁguration is required.

Attention

Caution

Installation

Changing Configuration with Transceivers

You can attach cable of different media to one or both channels via a

transceiver. Table 3 list the transceivers avaiable.

Table 3: ATI Micro Transceiver Choices

Switching Configuration with Jumpers

Each channel can be switched between the BNC connector (labeled

10BASE2) and the AUI connector (labeled 10BASE5). To switch connectors,

you move a jumper block inside the bridge chassis.

Channels A and B are set at the factory to operate with pre-802.3Ethernet or

IEEE 802.3 10BASE5.

To determine which port is connected

If you are not sure which port is active for a given channel, you can check as

follows:

1. Connect one of the channel’s two ports to a cable that is transferring data.

2. If the channel’s Receive indicator flashes, you have selected the active

port, if not, the other port is active.

To change the jumper block

If you need to switch port connections for Channel A and/or Channel B, ﬁnd

the locations of the jumper blocks as shown in Figure 2. Look up the proper

jumper block position(s) as listed in Table 4.

1. Remove the power cord and any cables from the AT-3675 front panel.

Openingthebridge without unplugging the powercordmayexposepersonnel

to high voltage, risking the possibility of injury or death. See safety

statements starting on page i.

2. Remove the three screws along the front edge of the top.

3. Turn the bridge upside-down and loosen the top cover by removing the

three screws along each side and the three screws along the back.

4. Remove the top cover by sliding it towards the back. If the cover fits

tightly, use a screwdriver to dislodge it.

Model Description

AT-MX25F Fiber Optic (FOIRL, 10BASE-FL), SMA Connector

AT-MX26F Fiber Optic (FOIRL, 10BASE-FL), ST Connector

AT-210T/AT-210TS/AT-MX20T UTP (10BASE-T)

AT-MX10/AT-MX10S Thin Ethernet (10BASE2)

Note

Warning

Indice

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