Cabletron Systems TRMM-4 User Manual

BOOKTITLE2 OPTIONAL

TRMM-4

TOKEN RING

MANAGEMENT MODULE

USER’S GUIDE

TRMM-4 QUICK REFERENCE

QR.1 SWITCHBLOCK SW1 SETTINGS

FNB Ring 1

FNB Ring 3

Unused

on

NVRAM
Clear

SW1

Forced
Network Download

FNB Ring 4

FNB Ring 2

Reset
Passwords

Switchblock SW1 With Factory Default Settings

Switch Function

(Default settings shown in

bold

1 Ring speed of FNB Ring 1 for all port switching MIMs.

On – 16 Mbps

; Off – 4 Mbps

2 Ring speed of FNB Ring 2 for all port switching MIMs.

On – 16 Mbps

; Off – 4 Mbps

3 Ring speed of FNB Ring 3 for all port switching MIMs.

On – 16 Mbps

; Off – 4 Mbps

4 Ring speed of FNB Ring 4 for all port switching MIMs.

On – 16 Mbps

; Off – 4 Mbps

)

5 Unused
6 Toggle to initiate a Forced Network Download.
7 Toggle to clear NVRAM.
8 Toggle to reset passwords to defaults.

QR-1

TRMM-4 QUICK REFERENCE

The TRMM-4 does not control the ring speeds of single-ring

NOTE

MIMs.

QR.2 LED STATUS DESCRIPTIONS

LED Status Meaning

OFF No power to module.
GREEN Testing and booting are nearly complete.

CPU

LWRP

16 Mb

XMT

RCV

Blinking
GREEN

RED Module is resetting or has detected errors.
Blinking RED Module has failed self-tests.
OFF The left connection is

AMBER

AMBER Interface ring speed is set to 16 Mbps.
OFF Interface ring speed is set to 4 Mbps
Flashing

GREEN
Blinking RED Beaconing condition on the ring.
OFF Interface is inactive.
RED Interface is disabled.
Flashing

AMBER

Operational.

not

left wrapped.

Left connection has been wrapped. FNB Ring 1
interface has been isolated from all other MIMs.

.

Information transmission by the TRMM-4

Network activity.

.

RED Interface disabled.

GREEN

NSRT

OFF Interface is not inserted into any ring.

QR-2

Interface is inserted into the ring and is
participating as a station on that ring.

TRMM-4 QUICK REFERENCE

QR.3 CPU - CENTRAL PROCESSOR UNIT

The

CPU

LED indicates the operational status of the TRMM-4’s

CPU

processor. During start-up, the
operational states, as shown below in the table.

State(s) Meaning

OFF The module is not receiving power.
Briefly turns RED The module is resetting.
GREEN The module has passed its power check.

LED indicates a variety of

AMBER

Cycles through AMBER,
OFF, GREEN, and OFF for a
while.

Momentarily to RED, but
continues cycling.

If blinking RED,
(continuously)

GREEN Testing and booting are nearly complete.

Blinking GREEN

Performing diagnostic checks.
(It will stay here for a while.)

Testing and booting period has begun.

The module has detected errors during
the start-up sequence, but has continued
the process.

The module has failed self-tests.

The module is fully functional.

LED stays BLINKING GREEN under
normal operation.

The CPU

QR-3

TRMM-4 QUICK REFERENCE

QR-4

Only qualified personnel should perform installation
procedures.

NOTICE

Cabletron Systems reserves the right to make changes in specifications and other information
contained in this document without prior notice. The reader should in all cases consult Cabletron
Systems to determine whether any such changes have been made.

The hardware, firmware, or software described in this manual is subject to change without notice.
IN NO EVENT SHALL CABLETRON SYSTEMS BE LIABLE FOR ANY INCIDENTAL,

INDIRECT, SPECIAL, OR CONSEQUENTIAL DAMAGES WHATSOEVER (INCLUDING BUT
NOT LIMITED TO LOST PROFITS) ARISING OUT OF OR RELATED TO THIS MANUAL OR
THE INFORMATION CONTAINED IN IT, EVEN IF CABLETRON SYSTEMS HAS BEEN
ADVISED OF, KNOWN, OR SHOULD HAVE KNOWN, THE POSSIBILITY OF SUCH
DAMAGES.



Copyright 1997 by Cabletron Systems, Inc., P.O. Box 5005, Rochester, NH 03866-5005
All Rights Reserved
Printed in the United States of America

Order Number: 9031391-01 September 1997

Cabletron Systems, SPECTRUM, LANVIEW
Element Manager, MIM

VT100

is a trademark of Digital Equipment Corporation.

All other product names mentioned in this manual may be trademarks or registered trademarks of
their respective companies.

, and

TRMM-4

, FNB, and MMAC

are trademarks of Cabletron Systems, Inc.

are registered trademarks and

FCC NOTICE

This device complies with Part 15 of the FCC rules. Operation is subject to the following two
conditions: (1) this device may not cause harmful interference, and (2) this device must accept any
interference received, including interference that may cause undesired operation.

NOTE:

device, pursuant to Part 15 of the FCC rules. These limits are designed to provide reasonable
protection against harmful interference when the equipment is operated in a commercial environment.
This equipment uses, generates, and can radiate radio frequency energy and if not installed in
accordance with the operator’s manual, may cause harmful interference to radio communications.
Operation of this equipment in a residential area is likely to cause interference in which case the user
will be required to correct the interference at his own expense.

This equipment has been tested and found to comply with the limits for a Class A digital

WARNING:

party responsible for compliance could void the user’s authority to operate the equipment.

Changes or modifications made to this device which are not expressly approved by the

Printed on Recycled Paper

i

NOTICE

DOC NOTICE

This digital apparatus does not exceed the Class A limits for radio noise emissions from digital
apparatus set out in the Radio Interference Regulations of the Canadian Department of
Communications.

Le présent appareil numérique n’émet pas de bruits radioélectriques dépassant les limites applicables
aux appareils numériques de la class A prescrites dans le Règlement sur le brouillage radioélectrique
édicté par le ministère des Communications du Canada.

VCCI NOTICE

This is a Class A product based on the standard of the Voluntary Control Council for Interference by
Information Technology Equipment (VCCI). If this equipment is used in a domestic environment,
radio disturbance may arise. When such trouble occurs, the user may be required to take corrective
actions.

CABLETRON SYSTEMS, INC. PROGRAM LICENSE AGREEMENT

IMPORTANT:

This document is an agreement between you, the end user, and Cabletron Systems, Inc. (“Cabletron”)
that sets forth your rights and obligations with respect to the Cabletron software program (the
“Program”) contained in this package. The Program may be contained in firmware, chips or other
media. BY UTILIZING THE ENCLOSED PRODUCT, YOU ARE AGREEING TO BECOME
BOUND BY THE TERMS OF THIS AGREEMENT, WHICH INCLUDES THE LICENSE AND
THE LIMITATION OF WARRANTY AND DISCLAIMER OF LIABILITY. IF YOU DO NOT
AGREE TO THE TERMS OF THIS AGREEMENT , PR OMPTLY RETURN THE UNUSED
PRODUCT TO THE PLACE OF PURCHASE FOR A FULL REFUND.

Before utilizing this product, carefully read this License Agreement.

CABLETRON SOFTWARE PROGRAM LICENSE

1. LICENSE
package subject to the terms and conditions of this License Agreement.

You may not copy, reproduce or transmit any part of the Program except as permitted by the
Copyright Act of the United States or as authorized in writing by Cabletron.

2. OTHER RESTRICTIONS. You may not reverse engineer, decompile, or disassemble the
Program.

3. APPLICABLE LA W. This License Agreement shall be interpreted and governed under the laws
and in the state and federal courts of New Hampshire. You accept the personal jurisdiction and
venue of the New Hampshire courts.

. You have the right to use only the one (1) copy of the Program provided in this

ii

NOTICE

EXCLUSION OF WARRANTY AND DISCLAIMER OF LIABILITY

1. EXCLUSION OF

writing, Cabletron makes no warranty, expressed or implied, concerning the Program (including
its documentation and media).

CABLETRON DISCLAIMS ALL WARRANTIES, OTHER THAN THOSE SUPPLIED TO
YOU BY CABLETRON IN WRITING, EITHER EXPRESSED OR IMPLIED, INCLUDING
BUT NOT LIMITED TO IMPLIED WARRANTIES OF MERCHANTABILITY AND
FITNESS FOR A PARTICULAR PURPOSE, WITH RESPECT TO THE PROGRAM, THE
ACCOMPANYING WRITTEN MA TERIALS, AND ANY A CCOMPANYING HARDW ARE.

2. NO LIABILITY FOR CONSEQUENTIAL DAMAGES. IN NO EVENT SHALL

CABLETRON OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER
(INCLUDING, WITHOUT LIMITATION, DAMAGES FOR LOSS OF BUSINESS,
PROFITS, BUSINESS INTERRUPTION, LOSS OF BUSINESS INFORMATION, SPECIAL,
INCIDENTAL, CONSEQUENTIAL, OR RELIANCE DAMAGES, OR OTHER LOSS)
ARISING OUT OF THE USE OR INABILITY TO USE THIS CABLETRON PRODUCT,
EVEN IF CABLETRON HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
DAMAGES. BECAUSE SOME STATES DO NOT ALLOW THE EXCLUSION OR
LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES, OR
ON THE DURATION OR LIMITATION OF IMPLIED WARRANTIES, IN SOME
INSTANCES THE ABOVE LIMITATIONS AND EXCLUSIONS MAY NOT APPLY TO
YOU.

WARRANTY. Except as may be specifically provided by Cabletron in

UNITED STATES GOVERNMENT RESTRICTED RIGHTS

The enclosed product (a) was developed solely at private expense; (b) contains “restricted computer
software” submitted with restricted rights in accordance with Section 52227-19 (a) through (d) of the
Commercial Computer Software - Restricted Rights Clause and its successors, and (c) in all respects
is proprietary data belonging to Cabletron and/or its suppliers.

For Department of Defense units, the product is licensed with “Restricted Rights” as defined in the
DoD Supplement to the Federal Acquisition Regulations, Section 52.227-7013 (c) (1) (ii) and its
successors, and use, duplication, disclosure by the Government is subject to restrictions as set forth in
subparagraph (c) (1) (ii) of the Rights in Technical Data and Computer Software clause at

252.227-7013. Cabletron Systems, Inc., 35 Industrial Way, Rochester, New Hampshire 03867-0505.

iii

NOTICE

DECLARATION OF CONFORMITY

Application of Council Directive(s):

Manufacturer’s Name:

Manufacturer’ s Address:

European Representative Name:

European Representative Address:

Conformance to Directive(s)/Product Standards:

Equipment Type/Environment:

89/336/EEC
73/23/EEC

Cabletron Systems, Inc.
35 Industrial Way

PO Box 5005
Rochester, NH 03867

Mr. J. Solari
Cabletron Systems Limited

Nexus House, Newbury Business Park
London Road, Newbury
Berkshire RG13 2PZ, England

EC Directive 89/336/EEC
EC Directive 73/23/EEC
EN 55022
EN 50082-1
EN 60950

Networking Equipment, for use in a
Commercial or Light
Environment.

Industrial

We the undersigned, hereby declare, under our sole responsibility, that the equipment packaged
with this notice conforms to the above directives.

Manufacturer Legal Representative in Europe
Mr. Ronald Fotino Mr. J. Solari

___________________________________ ___________________________________

Full Name Full Name
Principal Compliance Engineer Managing Director - E.M.E.A.

___________________________________ ___________________________________

Title Title
Rochester, NH, USA Newbury, Berkshire, England

___________________________________ ___________________________________

Location Location

iv

CONTENTS

PREFACE

CHAPTER 1 INTRODUCTION

1.1 TRMM-4 Functional Overview.....................................................1-2

1.1.1 Port Assignment .............................................................1-2

1.1.2 Ring Poll Failure Recovery .............................................1-3

1.1.3 Network Management..................................................... 1-3

1.1.4 Dividing Stations Among Rings ......................................1-4

1.1.5 Segmenting The FNB For Additional Rings.................... 1-5

1.1.6 Module Bypassing, Ring Bypassing, And Port Disabling 1-6

1.1.7 Network Interfaces.......................................................... 1-7

1.1.8 Ring Speed Assignments ...............................................1-7

1.1.9 Automatic Configuration At Power-Up............................1-7

1.1.10 RMON Functionality........................................................1-8

1.1.11 SNMP Traps ...................................................................1-8

1.1.12 Ring Security ..................................................................1-8

1.1.13 Automatic Beacon Recovery Process (ABRP) ...............1-8

1.1.14 Access To MIB Libraries.................................................1-8

1.1.15 TFTP Download Of Flash Image ....................................1-9

1.1.16 UPS Monitoring...............................................................1-9

1.2 User Access To Management Controls.......................................1-9

1.2.1 COM Ports......................................................................1-9

1.2.2 Telnet............................................................................ 1-10

1.2.3 Remote Network Management Applications................. 1-10

1.3 Front Panel Features.................................................................1-11

1.3.1 LANVIEW LEDs............................................................ 1-11

1.3.2 Reset Button.................................................................1-11

v

CONTENTS

CHAPTER 2 INSTALLATION

2.1 Unpacking And Handling The TRMM-4 .......................................2-1

2.2 Setting Switches And Jumpers ....................................................2-2

2.2.1 Setting FNB Ring Speeds ...............................................2-3

2.2.2 Forced Network Download..............................................2-3

2.2.3 Clearing NVRAM.............................................................2-4

2.2.4 Resetting Passwords To Defaults...................................2-4

2.3 Management Module Overrides...................................................2-4

2.3.1 Single Ring MIMs............................................................2-4

2.3.2 Port Switching MIMs........................................................2-4

2.4 Installing The TRMM-4.................................................................2-5

2.5 Resetting The Management Module............................................2-7

2.6 Configuring The TRMM-4 Using LM ............................................2-8

2.6.1 Establishing The Terminal Connection............................2-8

2.6.2 Assigning A Host IP Address ..........................................2-9

2.7 Choosing A Hub Configuration ..................................................2-10

2.7.1 Auto Configuration.........................................................2-10

2.7.2 Collapsed Backbone Configuration...............................2-11

2.7.3 Split Hub Configuration .................................................2-12

2.8 Connecting A UPS.....................................................................2-13

2.9 Power-On Diagnostics ...............................................................2-13

CHAPTER 3 MONITORING AND TROUBLESHOOTING

3.1 LANVIEW LEDS ..........................................................................3-1

3.1.1 CPU - Central Processor Unit .........................................3-3

3.1.2 LWRP - Left Wrap...........................................................3-3

3.1.3 16 Mb - Ring Speed 16 Mbps..........................................3-4

3.1.4 XMT - Transmit................................................................3-4

3.1.5 RCV - Receive.................................................................3-4

3.1.6 NSRT - Insert ..................................................................3-4

3.2 Troubleshooting The Network......................................................3-4

3.2.1 Failure To Access Local Management............................3-5

3.2.2 No Response To Remote Management..........................3-5

3.2.3 Failure To Manage Rings................................................3-6

3.2.4 Checking The Hub...........................................................3-6

3.2.5 Checking The Entire Network..........................................3-7

vi

CONTENTS

APPENDIX A INTRODUCTION TO MULTIPLE-RING MMAC

FUNCTIONALITY

A.1 Why Use Multiple Rings? ............................................................A-1

A.2 The Flexible Network Bus (FNB).................................................A-1

A.2.1 New Terminology ............................................................A-1

A.3 Comparing Port Switching And Single Ring MIMs ......................A-2

A.3.1 Single Ring Versus Port Assignment Management

Modules...........................................................................A-4

A.3.2 Mixing Single Ring And Port Switching MIMs .................A-4

A.4 Available Rings............................................................................A-4

A.4.1 FNB Rings.......................................................................A-4

A.4.2 Auxiliary Rings ................................................................A-5

A.4.3 Bypassed Rings ..............................................................A-5

A.5 A Sample Configuration...............................................................A-5

APPENDIX B BEACONING PROTECTION AND RECOVERY

APPENDIX C SPECIFICATIONS AND SETUP REQUIREMENTS

C.1 TRMM-4 Specifications ...............................................................C-1

C.2 LM Console Setup Requirements................................................C-1

C.3 COM Port Pinouts........................................................................C-2

C.4 Environmental Requirements......................................................C-5

C.5 Regulatory Compliance...............................................................C-5

C.6 Year 2000 Compliance................................................................C-6

APPENDIX D SUPPORTED MIB GROUPS

INDEX

vii

CONTENTS

viii

PREFACE

Welcome to the

Guide

. This manual describes the TRMM-4 Management Module

TRMM-4 Token Ring Management Module User’s

capabilities and features, operating specifications and configuration,
installation, and troubleshooting procedures. Users of the TRMM-4
should have a basic working knowledge of the IEEE 802.5 standard for
Token Ring networks and Token Ring network physical components.

DOCUMENT CONVENTIONS

The following conventions are used throughout this document:

Bold Italics

other

publications.

NOTE

are used for references to Cabletron Systems documents and

Note

calls your attention to information of special importance.

TIP

!

CAUTION

Tip

gives you a helpful hint concerning procedures and actions.

Caution

avoid damaging software, configuration settings, or equipment.

Hazard

equipment damage or personal injury because of dangers
associated with electrical shock.

calls your attention to information you should heed to

calls your attention to an action that could result in

ix

PREFACE

USING THIS MANUAL

Prior to installing and operating the TRMM-4, read through this manual
completely. If you are not familiar with port switching and four-ring
Flexible Network Bus (FNB) applications, read Appendix A.

The manual is organized as follows:
The Quick Reference Card at the front of this book provides visual aids

particularly useful to the installer.
Chapter 1,

Introduction

, describes the features and capabilities of the

TRMM-4.
Chapter 2,

Installation

, contains instructions for installing the TRMM-4
into a Multi Media Access Center (MMA C) and configuring the TRMM-4
for operation.

Chapter 3,

Monitoring And T roubleshooting

, provides instructions for
using LANVIEW LEDs. It also describes procedures to be performed if
problems emerge after the installation of the TRMM-4.

Appendix A,

Introduction To Multiple-Ring MMAC Functionality

,
discusses the concepts of port switching, differences between switching
and single ring MIMs, and presents a sample configuration.

Appendix B,

Beaconing Protection And Recovery

, describes Cabletron

Systems Automatic Beacon Recovery Process (ABRP).
Appendix C,

Specifications And Setup Requirements

, lists the
specifications of the TRMM-4, the requirements for terminal equipment
attached to the TRMM-4, and details pinout specifications for ports and
cables.

Appendix D,

Supported MIB Groups

Bases and their respective functionality supported by the TRMM-4.

x

, lists Management Information

PREFACE

RELATED MANUALS AND RECOMMENDED READING

The Cabletron Systems manuals listed below should be used to
supplement procedures and other technical data provided in this manual.
Procedures in related manuals are referenced where appropriate, but are
not repeated.

TRMM-4 Local Management User’s Guide
Multi-Media Access Center Overview and Set Up Guide

The following publications are recommended as references about the
implementation of Token Ring networks:

Local Area Networks, Token Ring Access Method
LAN Troubleshooting Handbook

, Mark Miller (1989, M&T

, IEEE 802.5

Publishing, Inc.)

Token Ring Technology Guide

, Cabletron Systems

The manuals referenced above can be obtained from the World W ide Web
in Adobe Acrobat Portable Document Format (PDF) at the following site:

http://www.cabletron.com/manuals

These manuals are also available on the Cabletron Systems Hardware
Manuals CD-ROM.

GETTING HELP

If you need additional support related to this device, or if you have any
questions, comments, or suggestions concerning this manual, contact the
Cabletron Systems Global Call Center:

Phone [phone]
Internet mail [e-mail]
FTP ctron.com (134.141.197.25)

Login
Password

BBS [phone]

Modem setting 8N1: 8 data bits, No parity, 1 stop bit

For additional information about Cabletron Systems or our products,
visit our World Wide Web site:
For technical support, select

anonymous
your email address

http://www.cabletron.com/

Service and Support

.

xi

PREFACE

Before calling the Cabletron Systems Global Call Center, have the
following information ready:

•

Your Cabletron Systems service contract number

•

A description of the failure

•

A description of any action(s) already taken to resolve the problem
(e.g., changing mode switches, rebooting the unit, etc.)

•

The serial and revision numbers of all involved Cabletron Systems
products in the network

•

A description of your network environment (layout, cable type, etc.)

•

Network load and frame size at the time of trouble (if known)

•

The device history (i.e., have you returned the device before, is this a
recurring problem, etc.)

•

Any previous Return Material Authorization (RMA) numbers

xii

CHAPTER 1

INTRODUCTION

The TRMM-4 Management Module (see Figure 1-1) can manage four
Token Rings simultaneously and control all Token Ring MIMs within a
Multi Media Access Center (MMAC). Also, it can assign ports to
different rings on port switching MIMs. The TRMM-4 is 802.5 and IBM
compliant.

TRMM-4

SN

RESET

R

R

I

I

N

N

G

G

1

2

R

R

I

I

N

N

G

G

3

4

C
O

M
1

C
O

M
2

Figure 1-1 TRMM-4 Management Module

TOKEN RING

1-1

INTRODUCTION

1.1 TRMM-4 FUNCTIONAL OVERVIEW

The TRMM-4 offers the follo wing features for the monitoring and control
of Token Ring LANs:

• Complete compatibility with all Token Ring MIMs.

• Ability to assign ports to different rings on port switching MIMs.

• Full RMON statistical/error network monitoring to track network

performance.

• Ability to act as a Distributed LAN Monitor (DLM) to reduce the

bandwidth needed for network management.

• Cabletron Systems Automatic Beacon Recovery Process (ABRP)

which enables networks to quickly recover from beaconing conditions
automatically .

• Ring Security options that allow you to regulate access to your

networks.

• SNMP compliance.

• Auto-configuration options (at initial power-on or after clearing

NVRAM) that allow you to automatically configure a collapsed
backbone or two independent Token Rings.

• A power-on Learn Mode that determines and maintains the

configuration of any port switching MIMs in the hub.

• Runtime IP address discovery that broadcasts BootP requests to obtain

an IP address if one is not assigned to Interface 1.

• Ring Poll Failure Recov ery that allo ws the TRMM-4 to automatically

remove stations that are causing ring poll failures.

1.1.1 Port Assignment

The TRMM-4 can individually assign ports to different rings on port
switching MIMs (e.g., TDRMIM and TRXMIM). This allows users to
insert into one of six different rings.

1-2

INTRODUCTION

1.1.2 Ring Poll Failure Recovery

The Cabletron Systems Ring Poll Failure Recovery Process automatically
removes any station that fails to correctly participate in the ring poll
process. This feature ensures that other stations are not prevented from
inserting into the ring by an unresolved ring poll failure condition caused
by a malfunctioning station on the ring. Upon detecting the presence of
Neighbor Notification Incomplete (NNI) frames on the ring, the TRMM-4
learns the identity of the offending station and transmits a Remove MAC
frame to the station to remove it from the ring.

The TRMM-4 transmits a trap (if traps are enabled) to the Network
Management Station (NMS) notifying the NMS that it was either able or
not able to correct the ring poll failure condition. If the recovery process
corrects the ring poll failure condition, the trap notifies the NMS that the
condition was corrected and specifies the offending station’s MAC
address and the port on the hub to which the offending station was
connected.

If the offending station cannot be definitively removed from the ring by
the recovery process (that is, if the offending station repeatedly attempts
to re-insert before the recovery process has concluded), a trap notifies the
NMS that the condition was not corrected and also identifies the last
station to correctly participate in the ring poll process. This information
helps network-management personnel to pinpoint the offending station,
which may need to be physically disconnected from the lobe port to
resolve the problem.

1.1.3 Network Management

The TRMM-4 allows you to monitor, configure, and manage networks
using:

• Out-of-band Local Management (LM) application

• A variety of in-band SNMP network management softw are, including

the Cabletron Systems SPECTRUM family.

1-3

INTRODUCTION

1.1.4 Dividing Stations Among Rings

The TRMM-4 is a port assigning management module. As described in
Appendix A, it provides the support needed by port switching MIMs to
execute port switching. This feature enables you to segment and manage
multiple Token Rings in the MMAC. Figure 1-2 shows an example of
how the TRMM-4 can assign the 12 ports of a TDRMIM to the FNB
rings.

In configuration A, Ports 1–3 are assigned to FNB Ring 1, Ports 4–6 are
assigned to FNB Ring 2, Ports 7–9 are assigned to FNB Ring 3, and Ports
10–12 are assigned to FNB Ring 4.

1

7

FNB Ring 1

3

FNB Ring 3

9

2

8

Configuration A
(Ports assigned

DR

SN

RING 1

16 Mb
16 Mb

RING 2

16 Mb

RING 3

16 Mb

RING 4

16 Mb

AUX 1

16 Mb

AUX 2

1
X

LINK PEN

2

R

X

I
N

3

G

X

P
O

LINK PEN

4

R

X

T
S

5

X

1

6

X

7
X

LINK PEN

8

R

X

I
N
G

9
X

P
O

10

LINK PEN

R

X

T
S

11

1

X

12
X

SWITCHING UTP/STP

TOKEN RING

BYP MGMT

RI

RO

RI

RO

10

FNB Ring 2

6

FNB Ring 4

22

ERR

IN USE
IN USE
IN USE
IN USE
IN USE
IN USE

TX

RX

TX

RX

TX

RX

TX

RX

4

12

5

11

to all FNB rings)

Figure 1-2 Sample Port/Station Assignments To The FNB Rings

(Configuration A)

In Figure 1-3 (configuration B), Port 2 is assigned from FNB Ring 1 to
FNB Ring 3, and Port 9 is assigned from FNB Ring 3 to FNB Ring 1.

1-4

INTRODUCTION

1

FNB Ring 1

3

7

FNB Ring 3

2

9

DR

SN

RING 1
RING 2
RING 3
RING 4
AUX 1
AUX 2

1
X

2
X

3
X

4
X

5
X

6
X

7
X

8
X

9
X

10

X

11

X

12

X

SWITCHING UTP/STP

TOKEN RING

8

Configuration B
(Port 2 assigned to

R
I
N
G

P
O
R
T
S

1

R
I
N
G

P
O
R
T
S

1

BYP MGMT
16 Mb
16 Mb
16 Mb
16 Mb
16 Mb
16 Mb

LINK PEN

RI

LINK PEN

RO

LINK PEN

RI

LINK PEN

RO

22

ERR

IN USE
IN USE
IN USE
IN USE
IN USE
IN USE

TX

RX

TX

RX

TX

RX

TX

RX

4

FNB Ring 2

6

10

FNB Ring 4

12

FNB Ring 3, Port 9
assigned to FNB Ring 1)

Figure 1-3 Sample Port/Station Assignments To The FNB Rings

(Configuration B)

5

11

Refer also to the TRMM-4 Local Management User’s Guide for details
on the execution of port assignment within an MMAC through the Local
Management application.

1.1.5 Segmenting The FNB For Additional Rings

FNB segmentation or “ring-wrapping” is another means of creating
additional Token Rings in the MMAC. In the MMAC, each Token Ring
MIM connects to adjacent MIMs, forming continuous FNB rings
extending from the first module in the hub to the last.

You can wrap the FNB interfaces of a single ring MIM
(e.g., the TRMIM-24A), breaking the backplane and segmenting the
FNB. For example, the FNB shown in Figure 1-4 has been segmented
between the MMAC’s Slots 5 and 6. The resulting segmented portions of
the FNB remain fully functional, but they do not communicate with each
other. Thus, you can increase the number of Token Ring LANs operating
in the MMAC by segmenting the FNB.

1-5