Cabletron Systems ETWMIM User manual

ETWMIM

ETHERNET / TOKEN RING / WAN

MEDIA INTERFACE MODULE

USER’S GUIDE

CABLETRON SYSTEMS, P. O. Box 5005, Rochester, NH 03867-0505

i

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.

CAUTION: THIS T1 CARD IS INTENDED TO BE INSTALLED IN CSA CERTIFIED/

UL LISTED EQUIPMENT BY A QUALIFIED SERVICE PERSON. CHECK THE

EQUIPMENT OPERATION/INSTALLATION INSTRUCTIONS AND/OR

EQUIPMENT MANUFACTURER TO VERIFY/CONFIRM YOUR EQUIPMENT IS

SUITABLE FOR INSTALLED APPLICATION CARDS.

CAUTION: ALWAYS DISCONNECT T1 BOARD (THE ONE WITH THE TELEPHONE

PLUG/JACK) FROM THE TELEPHONE SYSTEM WHEN INSTALLING OR WHEN

THE COVERS ARE REMOVED FROM THE HOST PRODUCT.

CAUTION: APPLY THE ENCLOSED ADHESIVE WARNING LABEL TO THE

OUTSIDE OR INSIDE OF THE EQUIPMENT ENCLOSURE ADJACENT TO THE T1

CARD.

Cabletron Systems Inc.

P.O. Box 5005, Rochester, NH 03867-0505

Printed in the United States of America

Order Number: 9030661-01 August, 1994

ETWMIM

,

MMAC

,

T1-SRM

,

EPIM-T

,

EPIM-X

,

EPIM-F1

/

F2

,

EPIM-F3, EPIM-C

,

TPT-T

,

FOT-F

,

FOT-F3

, and

Flexible Network Bus

are trademarks of Cabletron

Systems, Inc.

Spectrum

, and

LANVIEW

are registered trademarks of Cabletron Systems, Inc.

IBM

is aregistered trademark of International Business Machines Corporation.

VT200

and

VT300

are trademarks of Digital Equipment Corporation.

Compuserve

is a registered trademark of Compuserve, Inc.

Ethernet

is a trademark of Xerox Corporation.

Printed on recycled paper

NOTICE

ii

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

A digital 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.

WARNING: Changes or modifications made to this device which are not expressly

approved by the party responsible for compliance could void the user’s authority to

operate the equipment.

IC NOTICE

The Industry Canada label identifies certified equipment. This certification means that

the equipment meets certain telecommunications network protective, operational and

safety requirements. The department does not guarantee the equipment will operate to

the user’s satisfaction.

Before installing this equipment, users should ensure that it is permissible to be

connected to the facilities of the local telecommunications company. The equipment must

also be installed using an acceptable method of connection. In some cases, the company’s

inside wiring associated with a single line individual service may be extended by means

of a certified connector assembly (telephone extension cord). The customer should be

aware that compliance with the above conditions may not prevent degradation of service

in some situations.

Repairs to certified equipment should be made by an authorized Canadian maintenance

facility designated by the supplier. Any repairs or alterations made by the user to this

equipment, or equipment malfunctions, may give the telecommunications company

cause to request the user to disconnect the equipment.

Users should ensure for their own protection that the electrical ground connections of the

power facility, telephone lines and internal metallic water pipe system, if present, are

connected together. This precaution may be particularly important in rural areas.

CAUTION: USERS SHOULD NOT ATTEMPT TO MAKE SUCH CONNECTIONS

THEMSELVES, BUT SHOULD CONTACT THAT APPROPRIATE ELECTRIC

INSPECTION AUTHORITY, OR ELECTRICAN, AS APPROPRIATE.

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 Industry Canada.

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.

NOTICE

iii

CABLETRON SYSTEMS, INC. PROGRAM LICENSE AGREEMENT

IMPORTANT: Before utilizing this product, carefully read this License Agreement.

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, PROMPTLY RETURN THE UNUSED PRODUCT TO

THE PLACE OF PURCHASE FOR A FULL REFUND.

CABLETRON SOFTWARE PROGRAM LICENSE

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

in this 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 LAW. 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.

EXCLUSION OF WARRANTY AND DISCLAIMER OF LIABILITY

1. EXCLUSION OF WARRANTY. Except as may be specifically provided by

Cabletron in 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 EXPRESS OR IMPLIED,

INCLUDING BUT NOT LIMITED TO IMPLIED WARRANTIES OF

MERCHANTABLITY AND FITNESS FOR A PARTICULAR PURPOSE, WITH

RESPECT TO THE PROGRAM, THE ACCOMPANYING WRITTEN MATERIALS,

AND ANY ACCOMPANYING HARDWARE.

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

WARRANTEES IN SOME INSTANCES THE ABOVE LIMITATIONS AND

EXCLUSIONS MAY NOT APPLY TO YOU.

NOTICE

iv

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

v

CONTENTS

CHAPTER 1 INTRODUCTION

1.1 USING THIS MANUAL............................................................1-1

1.2 GETTING HELP........................................................................1-2

1.3 OVERVIEW................................................................................1-2

1.4 ETWMIM FEATURES ..............................................................1-2

1.5 BRIDGING AND THE ETWMIM.............................................1-5

1.5.1 Remote Bridging ..........................................................1-6

1.5.2 Transparent Bridging ..................................................1-6

1.5.3 Source Route Bridging .................................................1-7

1.5.4 CSMA/CD To Token Ring Translation .......................1-8

1.6 SPANNING TREE ALGORITHM.............................................1-8

CHAPTER 2 INSTALLATION

REQUIREMENTS/SPECIFICATIONS

2.1 MMAC REQUIREMENTS ........................................................2-1

2.2 COM 2 PORT AND TERMINAL REQUIREMENTS...............2-2

2.3 OPERATING SPECIFICATIONS.............................................2-5

2.3.1 Environmental Requirements .....................................2-5

2.3.2 Safety ............................................................................2-6

2.3.3 Physical .........................................................................2-6

CHAPTER 3 INSTALLING THE ETWMIM

3.1 UNPACKING THE ETWMIM ..................................................3-1

3.2 SETTING THE CONFIGURATION SWITCHES....................3-2

3.2.1 Setting the Switch Bank (SW2) ...................................3-3

3.2.2 Ethernet Connection Switch (SW4) ............................3-4

3.3 INSTALLING THE ETWMIM..................................................3-4

3.4 INSTALLING AN EPIM............................................................3-5

3.5 INSTALLING THE T1-SRM.....................................................3-6

3.6 CONFIGURING THE LBO SWITCH.......................................3-8

3.7 CONNECTING TO LOCAL MANAGEMENT .........................3-9

3.8 FINISHING THE INSTALLATION.........................................3-9

CONTENTS

vi

CHAPTER 4 USING LANVIEW

4.1 SYSTEM STATUS LEDs ...........................................................4-2

4.2 ETHERNET STATUS LEDs......................................................4-2

4.3 TOKEN RING STATUS LEDs ..................................................4-4

4.4 T1-SRM PORT STATUS LEDs..................................................4-5

4.5 SYNCHRONOUS PORT STATUS LEDs..................................4-6

CHAPTER 5 LOCAL MANAGEMENT

5.1 TERMINAL CONFIGURATION...............................................5-1

5.2 ACCESSING LOCAL MANAGEMENT....................................5-2

5.3 COMMUNITY NAME TABLE ..................................................5-3

5.3.1 Accessing the Community Name Table Screen ..........5-4

5.3.2 Community Name Table Screen Fields .......................5-4

5.3.3 Editing the Community Name Table Screen ..............5-5

5.4 CONFIGURING THE ETWMIM...............................................5-6

5.4.1 Accessing the Configuration Screen ............................5-7

5.4.2 Configuration Screen Fields ........................................5-7

5.4.3 Setting the IP Address Table and Subnet Mask Field 5-8

5.5 SETTING THE TRAP TABLE...................................................5-9

5.5.1 ETWMIM Trap Table Screen .......................................5-9

5.5.2 Trap Table Screen Fields ...........................................5-10

5.5.3 Configuring the Trap Table .......................................5-10

5.6 SNMP TOOLS ..........................................................................5-11

5.6.1 Accessing The SNMP Tools Screen ...........................5-11

5.6.2 SNMP Tools Screen Fields .........................................5-12

5.6.3 The Security Access Level ..........................................5-13

5.6.4 Getting And Setting OIDs ..........................................5-14

5.6.5 Scrolling Through MIB OIDs .....................................5-16

5.7 CONFIGURING WAN PHYSICAL ATTRIBUTES................5-18

5.7.1 Accessing the WAN Configuration Screen ................5-18

5.7.2 WAN Physical Configuration Screen Fields .............5-18

5.7.3 Setting the Active WAN Port Field ...........................5-20

5.7.4 Setting the SyncPort Type Field ................................5-21

5.7.5 Setting WAN Physical Configuration Screen Fields 5-21

5.7.6 Setting the T1 Timeslot Configuration Table ...........5-21

CONTENTS

vii

5.8 WAN INTERFACE CONFIGURATION SCREEN................5-24

5.8.1 WAN Interface Configuration Screen Fields ............5-25

5.8.2 Configuring PPP Interfaces .......................................5-27

5.8.3 Configuring Frame Relay Interfaces .........................5-28

5.8.4 Setting the Data Compression Field .........................5-29

5.8.5 Setting the Max Xmit Unit Field ..............................5-30

5.8.6 Setting the Line Coding Field ...................................5-30

5.9 COMMAND LINE INTERFACE (CLI)...................................5-31

APPENDIX A EPIM SPECIFICATIONS

A.1 EPIM CABLING GUIDELINES...............................................A-1

A.1.1 Twisted Pair Cable Requirements for the EPIM-T.....A-1

A.1.2 Multimode Fiber Optic Cable Requirements for the

EPIM-F1 and EPIM-F2 ................................................A-3

A.1.3 Single Mode Fiber Optic Cable Requirements for

the EPIM-F3..................................................................A-4

A.1.4 Thin-Net Cable Requirements for the EPIM-C...........A-5

A.1.5 AUI Cable Requirements for the EPIM-A

and EPIM-X...................................................................A-6

A.2 EPIM CONNECTOR SPECIFICATIONS................................A-7

A.2.1 EPIM-T (10BASE-T Twisted Pair Port).......................A-7

A.2.2 EPIM-F1 and EPIM-F2 (Multimode Fiber Optic

Ports)..............................................................................A-8

A.2.3 EPIM-F3 (Single Mode Fiber Optic Port)....................A-9

A.2.4 EPIM-C (BNC Port)....................................................A-11

A.2.5 EPIM-A and EPIM-X (AUI Ports)..............................A-12

A.3 CONNECTING AN EPIM TO THE ETHERNET

NETWORK...............................................................................A-12

A.3.1 Connecting an AUI Cable to an EPIM-A...................A-13

A.3.2 Connecting an Unshielded Twisted Pair Segment

to an EPIM-T...............................................................A-14

A.3.3 Connecting a Fiber Optic Link Segment

to an EPIM-F1, EPIM-F2, or EPIM-F3 .....................A-15

A.3.4 Connecting a Thin-Net Segment to an EPIM-C........A-18

A.3.5 Connecting an AUI Cable to an EPIM-X...................A-20

CONTENTS

viii

APPENDIX B DOWNLOADING AN IMAGE FILE

B.1 GETTING STARTED................................................................B-2

B.2 SETTING UP A UNIX WORKSTATION AS A RARP

SERVER.....................................................................................B-3

B.3 STANDARD LOCAL DOWNLOAD..........................................B-5

B.4 REMOTE RUNTIME DOWNLOAD.........................................B-6

APPENDIX C FCC PART 68 - USER’S INFORMATION

INDEX

Page 1-1

CHAPTER 1

INTRODUCTION

Welcome to the Cabletron Systems

ETWMIM Ethernet / Token

Ring / WAN Media Interface Module User’s Manual

. This manual

is designed to serve as an installation and reference guide for the

ETWMIM and to explain its capabilities and features.

You should read through this manual to gain a full understanding of

the ETWMIM and its capabilities. We assume that you have a general

working knowledge of Ethernet (IEEE 802.3), Token Ring (IEEE

802.5), and WAN type data communications networks and their

physical layer components.

1.1 USING THIS MANUAL

Chapter 1,

Introduction,

discusses the features of the ETWMIM and

explains wide area transmission, bridge ﬁltering, and use of the bridge

in multiple bridge environments.

Chapter 2,

Installation Requirements/Speciﬁcations

,

lists

hardware, location, and environmental requirements that must be

met before you install the ETWMIM.

Chapter 3,

Installing the ETWMIM

,

contains instructions for

installing the ETWMIM, optional EPIM, and optional T1-SRM.

Chapter 4,

Using LANVIEW

, describes how to use Cabletron Systems

built-in visual diagnostic and status monitoring system.

Chapter 5,

Local Management

, describes how to access and use the

ETWMIM Local Management.

Appendix A,

EPIM Speciﬁcations

, contains cabling speciﬁcations,

and EPIM connection instructions.

Appendix B,

Downloading an Image File

, provides basic TFTP code

downloading instructions, and guidelines for setting up a UNIX

workstation to support an image ﬁle download.

Appendix C,

FCC 68

, contains the FCC 68 rules for the ETWMIM.

INTRODUCTION

Page 1-2

1.2 GETTING HELP

If you need additional support relating to the ETWMIM, or if you have

any questions, comments, or suggestions relating to this manual,

contact Cabletron Systems Technical Support. Before calling, please

have the following information ready:

• The product type (e.g., ETWMIM)

• The product serial number.

Note:

Locate the serial number on the ETWMIM front panel.

You can contact Cabletron Systems Technical Support by:

Phone: Monday through Friday

between 8 A.M. and 8 P.M. EST

at (603) 332-9400.

CompuServe: GO CTRON from any ! prompt

Internet mail: [email protected]

1.3 OVERVIEW

The ETWMIM module resides in an MMAC hub, and acts as an

interface between various Ethernet and Token Ring LANs, as well as

providing a synchronous serial WAN port. Cabletron also offers an

optional T1-SRM module for the ETWMIM. The T1-SRM provides an

RJ-48C interface to provide wide area network connectivity.

The ETWMIM can bridge for up to 26 ports at one time — 2 local

networks (1 Ethernet and 1 Token Ring), and up to 24 WAN timeslots

using the optional T1-SRM.

1.4 ETWMIM FEATURES

LANVIEW

LANVIEW is Cabletron Systems’ visual diagnostic and monitoring

system. LEDs on the ETWMIM front panel, and optional connection

modules, indicate module and physical layer status.

INTRODUCTION

Page 1-3

Hot Swapping

Like all Cabletron Systems Media Interface Modules (MIMs), you can

remove the ETWMIM from, and insert it into, an MMAC without

turning off the power to the rest of the modules in the hub.

Flash EEPROMs

The ETWMIM uses Flash Electrically Erasable Programmable Read

Only Memory (EEPROM) that allows you to download new and

updated ﬁrmware using Remote LANVIEW/Windows, version 2.3 or

later or any device using BOOTP or TFTP protocols.

The ETWMIM supports the following download applications:

•

Standard Download

- the ETWMIM automatically disables

management while you download the new ﬁrmware image.

•

Runtime Download

- the ETWMIM continues to operate

without interruption while you download the new ﬁrmware

image. The ETWMIM stores the new image in Flash memory.

It continues to operate with the old ﬁrmware image executing

in processor memory until you reset the ETWMIM.

Management

An RS-232 port gives you direct access to ETWMIM Local

Management. Local Management provides unique set and control

capabilities for your ETWMIM. You access Local Management

through the COM 2 port using a VT series terminal, or a computer

running VT emulation software.

The ETWMIM also supports SNMP (Simple Network Management

Protocol) network management tools such as Cabletron Systems’

SPECTRUM products.

COM 1 / COM 2

The COM 1 port is reserved for future ETWMIM enhancements. The

COM 2 port provides access to ETWMIM Local Management.

Ethernet Connectivity

The ETWMIM allows for various connectivity options. From an

Ethernet standpoint, you can connect either through Channel A (the

Ethernet Channel) on your MMAC backplane, or from the optional

EPIM connection on the front panel.

INTRODUCTION

Page 1-4

Token Ring Connectivity

In addition to backplane Ethernet connectivity, the ETWMIM

provides Token Ring access through the Flexible Network Bus (FNB).

Wide Area Network Connectivity

The ETWMIM allows for Wide Area Network (WAN) connection in one

of two ways — the SYNC serial port or the optional T1-SRM module.

The SYNChronous port provides connection to external WAN

equipment (e.g., a T1 multiplexer or DDS CSU/DSU). This port

supports three interface types: RS-232, V.35, and RS-449/RS-422.

The T1-SRM, an optional internal T1 CSU/DSU interface, provides an

RJ48C connector on the front panel for T1 line access. This internal T1

module meets AT&T 62411 standard requirements. See Chapter 5,

Local Management

, for Conﬁguration instructions.

MIB Support

For additional information on how to extract and compile individual

MIBs, contact Cabletron Systems Technical Support (see

Getting

Help

). The ETWMIM supports the following MIBs:

IETF (Internet Engineering Task Force) Full Standard MIB:

• MIB II (RFC1213)

IETF Proposed Standard MIBs:

• Bridge MIB (RFC1286)

• RMON MIB (RFC1271)

• IEEE 802.5 Token Ring MIB (RFC1231)

• DS1 Interface MIB (RFC1406)

• RS232 MIB (RFC1317)

• PPP/LCP MIB (RFC1471))

• PPP/Bridge MIB (RFC1474)

• Frame Relay DTE MIB (RFC1315)

Cabletron Private Enterprise MIBs:

• CTRON BRIDGE MIB (ctbridge-mib.txt)

• CTRON CHASSIS MIB (chassis-mib.txt)

• CTRON DEVICE MIB (ctdevice-mib.txt)

• CTRON DOWNLOAD MIB (ctdownload-mib.txt)

• CTRON ETWMIM MIB (etwmim-mib.txt)

• CTRON FNB-TOKEN RING MIB (ctfnbtr-mib.txt)

• CTRON-IMIM-ADDRESS-MIB

INTRODUCTION

Page 1-5

Protocols

The ETWMIM supports the following transmission Protocols:

• Internet Protocol (IP)

• IPX

• AppleTalk

• Point to Point Protocol (LCP and BNCP), as deﬁned by

RFC1331

• Frame Relay (RFC1490, ANSI T1.617 Annex D)

1.5 BRIDGING AND THE ETWMIM

The primary function of the ETWMIM is to bridge between different

transmission technologies (i.e., Ethernet, Token Ring, and Wide Area).

When the ETWMIM receives frames (trafﬁc) from one of its

connections, it places the frames in buffer memory, and determines:

• the type of frames (depending on the receiving port)

• where the frames came from (source address), and if it has seen

frames from this address before (learning)

• where the frames are going (destination address), and if it has

received frames from this address before (ﬁltering database

look-up)

• whether to forward (send on) or ﬁlter any of these frames

(database look-up result)

• what port/channel to use if it must forward the frames.

In the process of bridging trafﬁc, the ETWMIM may have to translate

frames from one transmission type to another (e.g., Ethernet - Token

Ring, Token Ring - Ethernet), or encapsulate the frames for timed/

synchronous transmission (e.g., WAN PPP frame encapsulation).

INTRODUCTION

Page 1-6

1.5.1 Remote Bridging

The ETWMIM uses Point to Point Protocol (PPP) or Frame Relay

Protocol to communicate across a Wide Area link. When transmitting

with PPP or Frame Relay, the ETWMIM uses High level Data Link

Control (HDLC) as a basis for encapsulating MAC frames. When

connecting your ETWMIM to a Wide Area Network, keep the following

in mind:

• If transmitting to a non-Cabletron device at the other side of

the WAN link, make sure that device expects to receive MAC

frames encapsulated in PPP or Frame Relay.

• When using a router to connect networks across a WAN link,

make sure the router conﬁguration is set to bridge all network

trafﬁc using PPP or Frame Relay.

1.5.2 Transparent Bridging

Transparent Bridging, used in Ethernet, Token Ring, and FDDI

networks, operates by:

• building a Source Address Table (SAT) from source MAC/

physical addresses

• using the SAT to make forwarding decisions.

The ETWMIM prevents unnecessary network trafﬁc from passing

through the module by implementing two separate ﬁltering processes

— IEEE 802.1d or Cabletron’s Special Filtering Database. The

ETWMIM can use these processes individually or in tandem.

The ﬁrst process, the IEEE 802.1D ﬁltering process, begins with the

creation of a list of local node addresses in a table (the SAT). When the

ETWMIM ﬁrst goes on-line, it initially forwards all packets across the

bridge. After receiving a packet on the bridge port, the ETWMIM

learns the address of the sending node from the packet and stores that

address in the SAT. In this manner, the bridge learns the address of

each node on each side of the bridge. The bridge then uses the

addresses stored in the table to compare the destination address of

each subsequent packet that travels to the bridge. If the destination

address of a packet resides on the bridge segment, the ETWMIM does

not forward across the WAN or Token Ring link.

INTRODUCTION

Page 1-7

The second ﬁltering process, the Cabletron Systems Special Filtering

Database, provides an additional step in the ﬁlter/forward decision.

Through Remote Management, you can deﬁne up to 10 additional

ﬁltering parameters for incoming network trafﬁc. These parameters

include (but are not limited to) the:

• destination address

• source address

• type ﬁeld (protocol)

• 64 bytes of the data ﬁeld (using a data offset).

For example, using this process, you can ensure that the ETWMIM

always ﬁlters or forwards packets with a speciﬁc protocol or address.

1.5.3 Source Route Bridging

Source Route Bridging, currently used in Token Ring and WAN

networks, operates by transmitting frames over a designated route.

Unlike Transparent Bridging, all devices in a Source Route Bridged

(SRB) network “know” the locations of other stations within the

network. Using a portion of the MAC frame header, the source bridge

determines the route for the frames it sends.

In order for source routing to work, the source station must determine

the proper route to reach the desired destination. To accomplish this:

• The source station sends out frames called All Route Explorer

(ARE) frames onto the network. All Source Route Bridges

recognize these ARE frames and copy them into their outbound

port tables.

• The receiving bridges append their own route information to

the Route Information Field (RIF) in the MAC frame header

and transmit the frame again.

• Eventually, the original source device receives all of the ARE

replies from the other Source Route Bridges on the network.

• From this information, the source device can determine a

desired route for each frame it transmits.

INTRODUCTION

Page 1-8

1.5.4 CSMA/CD To Token Ring Translation

When using the ETWMIM, source and destination networks may

often differ in MAC types (e.g., Ethernet - Token Ring, Token Ring -

Ethernet). To bridge trafﬁc between these different MAC types,

translation bridging is necessary.

1.6 SPANNING TREE ALGORITHM

The ETWMIM promotes maximum network use in multiple bridge

environments. A bridge learns the bridge topology of its network from

bridge protocol data that it receives from other bridges within the

network. The bridges then apply the Spanning Tree Algorithm (STA)

to select a root bridge, and then determine primary data paths within

potential data loop conﬁgurations.

Spanning Tree Algorithm is a hierarchy (or tree) of priorities that

bridges establish between themselves. This hierarchy guarantees that

primary and redundant data paths are clearly deﬁned at all times, so

that the network is continuously available to users.

In a multiple bridge environment, one bridge in the network

establishes itself as the root bridge. As the root, this bridge has

priority over all other bridges. In a Spanning Tree, all of the bridges

must determine which bridge is the root, and then determine their

own relative priority within the network.

Page 2-1

CHAPTER 2

INSTALLATION

REQUIREMENTS/SPECIFICATIONS

This chapter lists MMAC and Local Management console

requirements and concludes with operational speciﬁcations for the

ETWMIM. You must meet all conditions, guidelines, speciﬁcations,

and requirements in this chapter to achieve optimum performance

from this equipment. Failure to follow these guidelines may result in

unsatisfactory network performance.

See Appendix A,

EPIM Speciﬁcations

, for information concerning

the optional Ethernet Port Interface Modules.

2.1 MMAC REQUIREMENTS

The ETWMIM should be installed in an MMAC equipped with a

Flexible Network Bus (either an MMAC-3FNB, MMAC-5FNB or an

MMAC-8FNB).

Note

: The FNB is a full-height, full-width backplane that links

Cabletron Systems FDDI or Token Ring products. Upgrade kits for

MMAC-3s and MMAC-8s (without an FNB) are currently available.

Contact Cabletron Systems Technical Support for more information.

Two types of MMACs currently support FNB architecture — shunting

and non-shunting. Shunting MMAC-FNBs allow modules to continue

communicating on their perspective buses, regardless of whether

there is an empty slot between them in the chassis.

Table 2-1 lists the part numbers of the MMAC chassis that have

shunting capabilities.

REQUIREMENT/SPECIFICATIONS

Page 2-2

Table 2-1. MMACs with Shunting Capabilities

2.2 COM 2 PORT AND TERMINAL REQUIREMENTS

The COM 2 port supports a Digital Equipment Corporation VT200™ or

VT300™ series terminal (or emulation of one of these terminals). This

section lists the specifications for the front panel COM 2

port and the

necessary terminal requirements to access ETWMIM Local

Management.

An RJ-45 connector provides the interface to a management terminal.

The maximum COM 2 cable length is 50 feet. Figure 2-1 illustrates the

required pin configuration.

MMAC Chassis Part #

MMAC-3FNB FC000000000 or above

MMAC- 5FNB CC000000000 or above

MMAC-8FNB CG000000000 or above

MMAC-M8FNB DK000000000 or above

MMAC-M5FNB all

MMAC-M3FNB all

REQUIREMENT/SPECIFICATIONS

Page 2-3

Figure 2-1. Console Cable Pinouts

You must properly configure your terminal to communicate with Local

Management. Table 2-2 lists the setup requirements for the local

management console. For more detailed setup information, the

keyboard map, or information on setting up a PC emulation, refer to

your specific terminal manual. If your terminal is a Digital Equipment

Corporation VT series terminal, press

F3

to access the Setup Directory.

Pin 1

RJ-45 CONSOLE PORT

CLEAR TO SEND

2

3

5

7

RECEIVE

TRANSMIT

SIGNAL GROUND

RJ-45 TO 25 PIN

CABLE

FEMALE - 25 Pin

"D" Shell Connector

20 DATA TERMINAL READY

4

1

5

2

6

TRANSMIT

RECEIVE

DATA SET READY

DATA TERMINAL READY

SIGNAL GROUND

CONSOLE PORT

RJ-45

LOCAL MANAGENT

CONSOLE

RECEIVE

TRANSMIT

SIGNAL GROUND

RJ-45 TO 9 PIN

CABLE

FEMALE - DB-9

(9-Pin Connector)

3

2

5

8

DATA SET READY

1

4

5

2

6

TRANSMIT

RECEIVE

SIGNAL GROUND

7

DATA TERMINAL READY

CLEAR TO SEND

READY TO SEND

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Cabletron Systems ETWMIM User manual

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