Avaya SMDS User Manual

Configuring SMDS Services

Router Software Version 10.0

Site Manager Software Version 4.0

Software Version BNX 6.0

Site Manager Software Version BNX 6.0

Part No. 112922 Rev. A

January 1996

4401 Great America Parkway 8 Federal Street
Santa Clara, CA 95054 Billerica, MA 01821

Copyright © 1988–1996 Bay Networks, Inc.

All rights reserved. Printed in the USA. January 1996.
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(continued)

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8 Federal Street, Billerica, MA 01821

Bay Networks, Inc.

Contents

About This Guide

Software Suites ................................................................................................................ xi

Audience ...........................................................................................................................xii

Before You Begin ..............................................................................................................xii

Bay Networks Customer Support .....................................................................................xii

CompuServe .............................................................................................................xiii

InfoFACTS .................................................................................................................xiv

World Wide Web ........................................................................................................xiv

How to Get Help ..............................................................................................................xiv

Conventions .....................................................................................................................xiv

Ordering Bay Networks Publications ............................................................................... xv

Acronyms .........................................................................................................................xvi

Chapter 1
SMDS Overview

How SMDS Sends LAN Data over WANs .......................................................................1-2

SMDS Interface Protocol ................................................................................................1-3

Data Exchange Interface Protocol ..................................................................................1-4

PDU Assembly .........................................................................................................1-5

SMDS Individual Addresses ...........................................................................................1-7

SMDS Group Addresses ................................................................................................1-7

For More Information about SMDS .................................................................................1-7

Chapter 2
Implementation Notes

Requirements for the Router and the DSU/CSU ............................................................2-3

DXI Protocol Requirements ......................................................................................2-3

Local Management Interface ....................................................................................2-3

Protocols Supported by SMDS .......................................................................................2-4

Priority of Heartbeat Poll Messages ...............................................................................2-4

v

Multinet ........................................................................................................................... 2-5

Multigroup .......................................................................................................................2-7

Configuring Synchronous Lines for SMDS ...................................................................2-10

Chapter 3
Enabling SMDS

Using the MIB Object ID .................................................................................................3-1

Enabling SMDS on an Interface .....................................................................................3-2

Chapter 4
Editing SMDS Parameters

Editing SMDS Interface Parameters ...............................................................................4-2

SMDS Interface Parameter Descriptions .................................................................4-4

Deleting SMDS from the Router .....................................................................................4-8

Appendix A
SMDS Default Settings

Index

vi

Figures

Figure 1-1. SMDS Sample Network ...........................................................................1-2

Figure 1-2. SMDS Interface Protocol Stack ...............................................................1-3

Figure 1-3. SMDS Level-3 PDU .................................................................................1-4

Figure 1-4. DXI Protocol .............................................................................................1-5

Figure 1-5. DXI Packet Assembly ...............................................................................1-6

Figure 2-1. Access to SMDS Network via a Router and DSU/CSU ...........................2-1

Figure 2-2. Low-Speed Access to SMDS Network .....................................................2-2

Figure 2-3. Low-Speed Access to SMDS Network via a Low-Speed DSU ................2-2

Figure 2-4. SMDS and IP Addresses for a Multinet Configuration .............................2-5

Figure 2-5. Multinet Configuration ..............................................................................2-6

Figure 2-6. Multigrouping SMDS and IP Addresses ...................................................2-7

Figure 2-7. Multigroup Configuration ..........................................................................2-9

Figure 3-1. SMDS Configuration Window ...................................................................3-2

Figure 4-1. Configuration Manager Window ...............................................................4-2

Figure 4-2. SMDS Interface List Window ...................................................................4-3

vii

Tables

Table 2-1. Synchronous Line Parameter Settings for SMDS ..................................2-10

Table A-1. SMDS Interface Parameters ................................................................... A-1

ix

About This Guide

If you are responsible for configuring and managing Bay Networks routers or
BNX platforms, read this guide to learn how to customize Bay Networks software
for Switched Multimegabit Data Services (SMDS).

This guide,

• An overview of the SMDS protocol (see Chapter 1)

• Implementation notes that may affect how you configure SMDS
(see Chapter 2)

• Instructions on enabling SMDS on your router (see Chapter 3)

• Instructions on editing SMDS interface parameters and configuring SMDS
(see Chapter 4)

Software Suites

Routing and Switching software is available in the following suites:

• The
Bridge, Translation Bridge, SNMP Agent, Bay Networks HDLC, PPP, OSPF,
EGP, BGP, and basic DLSw.

• The
IPX, and ATM DXI, in addition to the System Suite.

• The
addition to the System Suite.

• The
entirety.

Configuring SMDS Services

System Suite

LAN Suite

WAN Suite

Corporate Suite

includes IP routing, 802.1 Transparent Bridge, Source Route

includes DECnet Phase 4, AppleTalk Phase 2, OSI, VINES,

includes ATM DXI, Frame Relay, LAPB, and X.25, in

includes the System, LAN, and WAN suites in their

, offers

• The

ARE ATM Suite

signaling, in addition to the LAN Suite.

provides RFC 1483 and 1577 compliance, ATM UNI 3.0

xi

Configuring SMDS Services

• The
addition to the ARE ATM Suite and Corporate Suite.

• The
PPP, OSPF, EGP, BGP, File-Based Performance Statistics, Frame Relay
switching, and Frame Relay billing, and selected components from the
Corporate, ARE A TM, and ARE VNR Corporate suites.

Availability of features and functionality described in this guide depends on the
suites you are using.

Audience

Written for system and network managers, this guide provides instructions on how
to configure the Bay Networks implementation of SMDS interfaces to suit your
environment.

We assume that you have experience with LANs and WANs, SMDS, and general
network management tasks.

Before Y ou Begin

Before using this guide, you must complete the following procedures:

ARE VNR Corporate Suite

BNX Suite

includes IP Routing, SNMP Agent, Bay Networks HDLC,

provides ATM Forum LAN Emulation, in

• Create and save a configuration file that has at least one SMDS interface.

• Retrieve the configuration file in local, remote, or dynamic mode.

For instructions, refer to

and Trunks (BNX Software)

Configuring Routers

, depending on the type of installed software.

Bay Networks Customer Support

Bay Networks provides live telephone technical support to our distributors,
resellers, and service-contracted customers from two U.S. and three international
support centers. If you have purchased your Bay Networks product from a
distributor or authorized reseller, contact the technical support staff of that
distributor or reseller for assistance with installation, configuration,
troubleshooting, or integration issues.

xii

or

Configuring Customer Access

CompuServe

About This Guide

Customers also have the option of purchasing direct support from Bay Networks
through a variety of service programs. The programs include priority access
telephone support, on-site engineering assistance, software subscription, hardware
replacement, and other programs designed to protect your investment.

To purchase any of these support programs, including PhonePlus™ for 24-hour
telephone technical support, call 1-800-2LANWAN. Outside the U.S. and
Canada, call [phone]. You can also receive information on support
programs from your local Bay Networks field sales office, or purchase Bay
Networks support directly from your reseller. Bay Networks provides several
methods of receiving support and information on a nonpriority basis through the
following automated systems.

Bay Networks maintains an active forum on CompuServ e. All you need to join us
online is a computer, a modem, and a CompuServe account. We also recommend
using the CompuServe Information Manager software, available from
CompuServe.

The Bay Networks forum contains libraries of technical and product documents
designed to help you manage and troubleshoot your Bay Networks products.
Software agents and patches are available, and the message boards are monitored
by technical staff and can be a source for problem solving and shared experiences.

Customers and resellers holding Bay Networks service contracts can visit the
special libraries to acquire advanced levels of support documentation and
software.

To open an account and receive a local dial-up number, call CompuServe at
1-800-524-3388 and ask for Representative No. 591.

• In the United Kingdom, call Freephone 0800-289378.

• In Germany, call 0130-37-32.

• In Europe (except for the United Kingdom and Germany), call
(44) 272-760681.

• Outside the U.S., Canada, and Europe, call [phone] and ask for
Representative No. 591, or consult your listings for an office near you.

Once you are online, you can reach our forum by typing the command GO
BAYNETWORKS at any ! prompt.

xiii

Configuring SMDS Services

InfoFACTS

InfoFACTS is the Bay Networks free 24-hour fax-on-demand service. This
automated system contains libraries of technical and product documents designed
to help you manage and troubleshoot your Bay Networks products. The system
can return a fax copy to the caller or to a third party within minutes of being
accessed.

W orld Wide Web

The World Wide Web (WWW) is a global information system for file distribution
and online document viewing via the Internet. You need a direct connection to the
Internet and a Web Browser (such as Mosaic or Netscape).

Bay Networks maintains a WWW Home Page that you can access at http://
www.baynetworks.com. One of the menu items on the Home Page is the
Customer Support Web Server, which offers technical documents, software
agents, and an E-mail capability for communicating with our technical support
engineers.

How to Get Help

For additional information or advice, contact the Bay Networks Technical
Response Center in your area:

United States 1-800-2LAN-WAN
Valbonne, France (33) 92-966-968
Sydney, Australia (61) 2-903-5800
Tokyo, Japan (81) 3-328-005

Conventions

This section describes the conventions used in this guide.
angle brackets (< >) Indicate that you choose the text to enter based on the

xiv

description inside the brackets. Do not type the
brackets when entering the command. Example: if

ping

command syntax is

192.32.10.12

<ip_address>

, you enter

ping

About This Guide

.

arrow character (➔) Separates menu and option names in instructions.

➔

Example: Protocols

AppleTalk identifies the

AppleTalk option in the Protocols menu.

bold text

Indicates text that you need to enter and command

dinfo

names in text. Example: Use the

command.

brackets ([ ]) Indicate optional elements. You can choose none, one,

or all of the options.

italic text

Indicates variable values in command syntax
descriptions, new terms, file and directory names, and
book titles.

quotation marks (“ ”) Indicate the title of a chapter or section within a book.

screen text

ellipsis points Horizontal (. . .) and vertical ellipsis points indicate

Indicates data that appears on the screen. Example:

Bay Networks Trap Monitor Filters

.

()

.

Set

omitted information.

vertical line (|) Indicates that you enter only one of the parts of the

command. The vertical line separates choices. Do not
type the vertical line when entering the command.

Example: If the command syntax is

show at routes
show at routes

nets

|

, you enter either

show at nets

or

, but not both.

Ordering Bay Networks Publications

To purchase additional copies of this document or other Bay Networks
publications, order by part number from Bay Networks Press™ at the following
numbers. You may also request a free catalog of Bay Networks Press product
publications.

Phone: [phone]
FAX - U.S./Canada: 1-800-582-8000
FAX - International: 1-916-939-1010

xv

Configuring SMDS Services

Acronyms

ARP Address Resolution Protocol
ATM Asynchronous Transfer Mode
CRC Cyclic Redundancy Check
DSU/CSU Digital Service Unit/Channel Service Unit
DS1 Digital Service, Level 1
DS3 Digital Service, Level 3
DXI data exchange interface
HSSI high-speed serial interface
IEEE Institute of Electrical and Electronic Engineers
IP Internet Protocol
IPX Internet Packet Exchange
LAN local area network
LMI Local Management Interface
MAC media access control
MAN metropolitan area network
OSI Open Systems Interconnection
OSPF Open Shortest Path First
PDU protocol data unit
PVCs permanent virtual circuits
RIP Routing Information Protocol
SIP SMDS Interface Protocol
SMDS Switched Multimegabit Data Services
SNI subscriber network interface
SNMP Simple Network Management Protocol
WAN wide area network
XNS Xerox Network System

xvi

Chapter 1

SMDS Overview

Switched Multimegabit Data Service (SMDS) is a public, high-speed, packet­switched network service that enables you to connect local area networks (LANs)
across wide area networks (WANs).

SMDS technology combines cell relay technology and IEEE Standard 802.6, the
link control protocol standard that controls cell transmission. To send information
across the network, SMDS divides data into fixed 53-byte cells. The use of cell
technology makes SMDS well suited for traffic that consumes high bandwidth for
short periods of time.

Figure 1-1 illustrates an SMDS network. In this illustration, LAN 1 communicates
to LAN 2 and 3 through a router connected to an SMDS Digital Service Unit/
Channel Service Unit (DSU/CSU). The DSU/CSU changes the frame-based data
from the router into cells that can then be sent across the SMDS network.

1-1

Configuring SMDS Services

LAN 1

Router

DSU/
CSU

SNI

Figure 1-1. SMDS Sample Network

The point at which the DSU/CSU meets the network is the subscriber network
interface (SNI). This is the access point to the SMDS network. Within the
switching system of the SMDS network, T3 communication lines connect the
network switches together.

Because data traffic and network equipment are different for each SMDS
customer, SMDS defines several
which data travels from the customer site to the network switch.

SMDS
Switch

SMDS

Network

T3

T3

SMDS
Switch

T3

SMDS
Switch

access classes

LAN 2

SNI

DSU/
CSU

LAN 3

DSU/
CSU

SNI

. Access classes are speeds at

Router

Router

SMDS currently offers six network access classes: 1.2 Mb/s, 4 Mb/s, 10 Mb/s,
16 Mb/s, 25 Mb/s, and 34 Mb/s. The 1.2 Mb/s class is for T1 lines. Classes
4 Mb/s through 34 Mb/s are for T3 lines. SMDS also offers low-speed SMDS
classes, which operate at fractional T1/E1 speeds (56 Kb/s up to 64 Kb/s).

How SMDS Sends LAN Data over WANs

LAN data is typically connectionless data. This means that it has addressing
information in each frame, so there is no need for a prior connection between the
origination and destination devices. WAN data is typically connection-oriented
data. This means that it needs a virtual circuit — that is, a predefined path across
physical lines — between the two connection points prior to sending data. SMDS
provides connectionless data transfer across a wide area network without
establishing a logical end-to-end connection.

1-2

SMDS Interface Protocol

The SMDS Interface Protocol (SIP) defines SMDS addressing, formatting,
framing, and error-detection requirements.

The SIP has three levels that are similar to, but do not match, the protocol layers
that make up the OSI protocol model.

• Le vel 3 specifies the addressing, formatting, and encapsulation of pack et data,
referred to as Level-3 PDUs.

• Level 2 specifies the segmentation of Level-3 Protocol Data Units (PDUs)
into short, fixed-length SMDS cells, referred to as Level-2 PDUs.

• Level 1 specifies the physical connectivity that enables transmission.

Figure 1-2 illustrates the SIP protocol stack.

Encapsulates Data into PDUs

SMDS Overview

Level 3

Level 2

Segments Data into 53-byte PDUs

Level 1

Prepares Level-2 PDUs for the Physical Medium

Figure 1-2. SMDS Interface Protocol Stack

SIP specifies that the SMDS source and destination addresses reside in the
Level-3 PDU header (Figure 1-3). Each header contains a MAC-level address in
an E.164 address format. E.164 formats are 64 bits long and provide both
individual and multicast addresses. Network switches use the address information
in the header to route the PDU to its destination.

1-3

Configuring SMDS Services

Header Trailer

Figure 1-3. SMDS Level-3 PDU

One or more SMDS devices, for example DSUs and routers, can perform the tasks
of the three SIP levels, as described in the next section.

Data Exchange Interface Protocol

For SMDS high-speed access classes, that is, speeds from 1.2 Mb/s to 34 Mb/s,
the SMDS Interest Group (SIG) wanted to simplify the integration of SMDS into
existing network equipment, and to hasten SMDS into the market. To do this, they
divided the functions defined by the SIP levels between devices that handle local
network packets (for example, a router) and devices that interface with the digital
services provided by common carriers (a DSU/CSU).

LAN Pac etk

1-4

The Data Exchange Interface (DXI) protocol defines this division of tasks and
describes the router and DSU/CSU relationship (Figure 1-4). Refer to the next
section for more information.

SMDS

Network

SMDS Overview

Router

DXI protocol defines the router
and DSU/CSU interface

Figure 1-4. DXI Protocol

DSU/CSU

For low-speed SMDS (56 Kb/s to 64 Kb/s), the DXI is extended out to the SMDS
network. In this case, you do not need a special SMDS DSU/CSU.

PDU Assembly

SMDS PDU assembly begins when the router receives a network-generated
packet. The router takes the entire packet and encapsulates it within a 36-byte
header (containing addressing, length, and control information) and a 4-byte
trailer (containing a CRC value), thereby creating an SMDS Level-3 PDU
(Figure 1-5).

The router next prepares the Level-3 PDU for transmission to the DSU/CSU by
encapsulating it within a DXI header and trailer that provide control information.
Upon receiving the DXI packet, the DSU/CSU strips the DXI header/trailer and
divides the Level-3 PDU into fixed-length (44-byte) units called
DSU/CSU encapsulates these cells within a 7-byte header and 2-byte trailer to
form Level-2 PDUs.

SMDS
Switch

SMDS
Switch

DSU/CSU

Router

cells

. The

Finally, the DSU/CSU inserts an additional four bytes of framing information
between each Level-2 PDU and transmits the framed cells across a
Digital Service Level 1 (DS1) or DS3 connection to the SMDS network.

Figure 1-5 shows the assembly of SMDS cells as specified by the DXI.

1-5

Configuring SMDS Services

Router Receives LAN Packet

Level-3

Encapsulation

Router

Level-2

Segmentation

DSU/CSU

DXI header

PAYLOAD PAYLOAD PAYLOAD

PAYLOAD

PAYLOAD

36-byte header

PAYLOAD

4-byte trailer

DXI trailer

DXI

PAYLOAD

4-byte trailer

PAYLOAD PAYLOAD PAYLOAD

cell

2-byte7-byte 44-byte

Framing field

2-byte7-byte 44-byte 2-byte7-byte 44-byte

cell cellheader trailer

Framing field

header

trailerheader trailer

Figure 1-5. DXI Packet Assembly

1-6

SMDS

Network

SMDS Individual Addresses

An SMDS individual address is a unique address that the SMDS provider assigns
to an SNI. Specifically, an individual address is a media access control layer
(MAC) address in an E.164 format. An E.164 address is a 64-bit address, which
for SMDS is similar to a phone number. For example, the phone number
[phone] becomes individual address C161 75 55 39 23 FF FF. The C
indicates that the address is an individual address, and the 1 is a standard prefix.
There can be up to 16 individual addresses for one SNI.

SMDS Group Addresses

An SMDS group address is one address that instructs an SMDS switch to
broadcast information, such as routing information packets (RIP) and address
resolution packets (ARP), from the router to multiple destination nodes. SMDS
individual addresses within the SMDS group identify these nodes.

Like an SMDS individual address, the group address is a media access control
layer (MAC) address in an E.164 format. An E.164 address is a 64-bit address,
which for SMDS is similar to a phone number. For example, the phone number
[phone] becomes individual address E1 50 85 55 11 44 FF FF. The E
indicates that the address is a group address and the 1 is a standard prefix.

SMDS Overview

For More Information about SMDS

The following documents provide technical details on SMDS and DXI protocol
design and implementation.

Baker, F. and Kolb, C.
RFC 1232, Network Information Center (NIC), SRI International, Menlo Park,
California, May 1991.

Bellcore.

Service

Bellcore.

Data Service

Generic Requirements for SMDS Customer Network Management

. Technical Advisory TA-TSV-001062, Issue 2, February 1992.

Generic System Requirements in Support of Switched Multi-Megabit

. Technical Reference TR-TSV-000772, Issue 1, May 1991.

Definitions of Managed Objects for the DS1 Interface T ype

.

1-7

Configuring SMDS Services

Bellcore.

in Support of Switched Multi-Megabit Data Service

Local Access System Generic Requirements, Objectives, and Interfaces

. T echnical Reference

TR-TSV-000773, Issue 1, June 1991.
Cox, T . and Tesink, K.

. RFC 1233, Network Information Center (NIC), SRI International, Menlo

Type

Definitions of Managed Objects for the DS3 Interface

Park, California, May 1991.
Klessig, R. and Tesink, T.

Multi-megabit Data Service

Piscitello, D. and Lawrence, J.

Service

. RFC 1209, Network Information Center (NIC), SRI International, Menlo

SMDS: Wide-Area Data Networking with Switched

. Prentice Hall, Inc., Englewood, New Jersey, 1995.

The Transmission of IP Datagrams over the SMDS

Park, California, March 1991.
SMDS Interest Group.

SMDS Data Exchange Interface Protocol

(Revision 3.2).

Technical Specification SIG-TS-001/1991, October 1991.
SMDS Interest Group.

SMDS DXI Local Management Interface

. T echnical

Specification SIG-TS-002/1992, May 1992.
The following publications provide a less technical introduction to SMDS service.
Davidson, R. and Muller, N.

Maintaining Broadband Networks

The Guide to SONET: Planning, Installing &

. Telecom Library, Inc., 1991.

1-8

Goldstein, F.

ISDN in Perspective

Reading, Massachusetts, 1992.

. Addison Wesley Publishing Company,

Chapter 2

Implementation Notes

This chapter provides information about the Bay Networks implementation of
SMDS. Specifically, it contains information about the router’s DXI protocol
requirements and the Local Management Interface protocol. This chapter also
supplies details on the use of SMDS group and individual addresses for multinet
and multigroup configurations.

To implement high-speed SMDS, you need a Bay Networks router and an SMDS
DSU/CSU that provides DS1- or DS3-based access to the switched SMDS
network. A synchronous or high-speed serial interface (HSSI) physically connects
the router and the DSU/CSU (Figure 2-1).

Router

DSU/CSU

HSSI

or

Synchronous

Interface

Figure 2-1. Access to SMDS Network via a Router and DSU/CSU

SMDS

Network

The router also supports low-speed SMDS through the SNI and DXI
specifications standardized by the SMDS Interest Group. If you are running low­speed SMDS, you can extend the DXI to the SMDS network, thereby eliminating
the need for a special SMDS DSU/CSU. Any synchronous interface, including
MCT1 or MCE1 link modules, physically connects the router and the network
(Figure 2-2).

2-1

Configuring SMDS Services

Router

Figure 2-2. Low-Speed Access to SMDS Network

Another low-speed SMDS option is to use a low-speed DSU/CSU to connect to
the network. In this case, a V.35 cable physically connects the router to the
DSU/CSU (Figure 2-3).

SMDS

Network

Synchronous or

MCT1/MCE1

Interface

(Low speed only)

2-2

Router

Low-Speed

DSU/CSU

V.35

Interface

SMDS

Network

Figure 2-3. Low-Speed Access to SMDS Network via a Low-Speed DSU

Requirements for the Router and the DSU/CSU

The next sections provide configuration requirements for the router and the
DSU/CSU to implement high-speed SMDS.

DXI Protocol Requirements

Version 3.2 of the DXI protocol manages the data exchange between the router
and the DSU/CSU. Because the router does not support earlier DXI versions, the
DSU/CSU must support DXI Version 3.2. DXI Version 3.2 provides an optional
heartbeat poll mechanism to periodically verify the router and DSU/CSU
connection. Be sure to enable heartbeat polling on the DSU/CSU.

The DXI also provides support for both 16-bit and 32-bit cyclic-redundancy
checks (CRCs). Network devices use CRCs to check data for transmission errors.
When the router or DSU/CSU receives data, each reads the CRC character and
compares the value it calculates to the actual CRC character in the data packet.

Ensure that the CRC values for the router and the DSU/CSU match. This means
that if you set the router to 16-bit CRCs, you must set the DSU/CSU to 16-bit
CRCs. If necessary, you can modify the CRC values (16-bit or 32-bit) for both
synchronous and HSSI connections.

Implementation Notes

Local Management Interface

The Local Management Interface (LMI) protocol works with the DXI to enable
the router and the DSU/CSU to exchange management information. The LMI uses
a subset of the Simple Network Management Protocol (SNMP) to provide for
router management queries, DSU/CSU responses to queries, and DSU/CSU­generated asynchronous trap events.

Before enabling the LMI on the router, ensure that the DSU/CSU supports this
protocol and that you enable it on the DSU/CSU.

2-3

Configuring SMDS Services

Protocols Supported by SMDS

SMDS can operate with the following protocols:

• AppleTalk

• Internet Packet Exchange (IPX)

• APPN

• LLC2

• Bridge (including Spanning Tree)

• Native Mode LAN

• DECnet IV

• Source Routing with Bay Networks 8101 encapsulation

• DLSw

• Source Routing with Spanning Tree

• Internet Protocol (IP), including Address Resolution Protocol (ARP) support

• Xerox Network System (XNS)

Note: SMDS does not support OSI.

Priority of Heartbeat Poll Messages

When you select SMDS on a circuit, the router automatically assigns the highest
priority to heartbeat poll and LMI messages that it sends to the DSU/CSU. The
heartbeat poll and LMI messages must have priority ov er other data to ensure that
during heavy traffic conditions, the link stays up and allo ws these messages to get
through to the DSU/CSU.

2-4

Multinet

Implementation Notes

Multinet, a feature of the Internet Protocol (IP), allows you to support many IP
networks over one SMDS line by allowing many hosts on a single logical IP
subnetwork. A multinet network is economical because you do not have to
purchase as many SMDS group addresses from your SMDS provider as you might
with other configurations.

Multinet configurations enable you to configure one SMDS individual address and
one SMDS group address for a single SNI and then associate many logical IP
subnetworks with these single SMDS addresses. A logical IP subnetwork is a host
that is directly connected to the SMDS network.

A second variation of a multinet configuration allows you to ha v e multiple SMDS
individual addresses along with a single SMDS group address by configuring an
individual address per IP host address for the same group address. For information
about IP, refer to Configuring IP Services.

Figure 2-4 shows the two types of multinet configurations.

Type 1

Single group and individual addresses, multiple IP address

lP Address

Group Address Individual Address lP Address

lP Address

Type 2

Single group address, multiple individual and IP address

Individual Address lP Address

Group Address Individual Address lP Address

Individual Address lP Address

Figure 2-4. SMDS and IP Addresses for a Multinet Configuration

Figure 2-5 on page 2-6 shows a sample multinet configuration, where several IP
networks are using one SNI. Each side of the network illustrates a different use of
group and individual addresses for connecting to the IP networks. A multinet
configuration allows for efficient network addressing and a cost-effective method
of implementing SMDS.

2-5

Configuring SMDS Services

Indicates logical IP interface
Indicates physical SMDS line

Single Group Address
for a single SNI

Individual Address:
C14089991000FFFF

Group and ARP Address:
E18008881000FFFF

Individual Address:
C14089991001FFFF

Group and ARP Address:
E18008881000FFFF

Router

SMDS

Network

Single
Group
Addresses
for a
single SNI

IP Address: 128.1.1.1
Addr. Mask: 255.255.255.0

Individual Address:
C14089991003FFFF

Group and ARP Address:

E18008881000FFFF

Individual Address:
C14089991002FFFF

Group and ARP Address:
E18008881000FFFF

Router

IP Address: 128.1.1.4

Addr. Mask: 255.255.255.0

IP Address: 150.50.1.1

Addr. Mask: 255.255.255.0

This side shows one Group Address with
many Individual and IP Addresses

Figure 2-5. Multinet Configuration

2-6

Router

IP Address: 128.1.1.2
Addr. Mask: 255.255.255.0

IP Address:
Addr. Mask: 255.255.255.0

This side shows one Group Address
with one Individual Address and
many IP Addresses

150.50.1.2

Implementation Notes

To configure multinet, follow these steps:

1. In your SMDS configuration parameters, enter addresses in the Group

Address, ARP Address, and Individual Address parameters described in
Chapter 3 of this book.

2. In your IP interface configuration, enter the same addresses that you

entered in the SMDS parameters in the previous step.

The equivalent IP parameters are SMDS Group Address, SMDS ARP Req
Address, and MAC address. Refer to Configuring IP Services for information
about these IP parameters.

3. Add a new IP interface with a unique IP address, which includes a

network/subnet and host address.

4. Enter the same Group Address, ARP Address, and Individual Address

that you entered in Step 2 for this new IP interface.

Note: You may also configure many individual addresses for an SMDS group

address, but ensure that each individual address within a group is unique.

Multigroup

Multigroup is a feature of the Internet Protocol (IP) that enables you to configure
multiple SMDS group addresses on the same SNI, which is the access interface to
the SMDS network. The router implements multigroup according to RFC 1209.
For information about IP, refer to Configuring IP Services.

Figure 2-6 shows a multigroup configuration.

Group Address Individual Address lP Address
Group Address Individual Address lP Address
Group Address Individual Address lP Address

Figure 2-6. Multigrouping SMDS and IP Addresses

Once you configure an SMDS group address, you can then assign this group
address to at least one IP subnetwork. An IP address identifies the subnetwork.

2-7

Configuring SMDS Services

By associating or pairing a different SMDS group address with each IP address,
you achieve multigrouping. A multigroup configuration enables you to use one
SMDS physical line (SNI) to connect many nodes located on different
subnetworks. It also allows you to limit broadcast and multicast traffic, such as
Routing Information Protocol (RIP) updates, Address Resolution Protocol (ARP)
updates, and Open Shortest Path First (OSFP) messages, to their respective SMDS
groups.

For example, in Figure 2-7, two separate subnetworks share the same SNI. The
routers in these networks use RIP updates to communicate network information.
The routers broadcast RIP updates to each node on the network. Because each RIP
network shares an SNI, the only way to prevent RIP updates from interfering with
one another is to isolate these subnetworks by associating each one with a
different SMDS group address.

2-8

Implementation Notes

Indicates logical IP interface
Indicates physical SMDS line

Single Group Addresses
for a single SNI

Individual Address:
C14089991000FFFF

Group and ARP Address:
E18008881000FFFF

Individual Address:
C14089991001FFFF

Group and ARP Address:
E18008881000FFFF

Multiple Group Addresses
for a single SNI

Individual Address:
C14089991002FFFF

Group and ARP Address:
E18008882000FFFF

Router

IP Address: 128.1.1.1
Addr. Mask: 255.255.255.0

SMDS

Network

Individual Address:
C14089991003FFFF

Group and ARP Address:

E18008881000FFFF

Multiple Group Addresses
for a single SNI

Individual Address:
C14089991004FFFF

Group and ARP Address:

E18008882000FFFF

Router

IP Address: 128.1.1.3

Addr. Mask: 255.255.255.0

IP Address: 150.50.1.2

Addr. Mask: 255.255.255.0

Figure 2-7. Multigroup Configuration

Router

IP Address: 128.1.1.2
Addr. Mask: 255.255.255.0

IP Address: 150.50.1.1
Addr. Mask: 255.255.255.0

2-9

Configuring SMDS Services

To configure multigroup, follow these steps:

1. In your SMDS configuration parameters, enter addresses in the Group

Address, ARP Address, and Individual Address parameters described in
Chapter 3 of this book.

2. In your IP interface configuration, enter the same addresses that you

entered in the SMDS parameters in the previous step.

The equivalent IP parameters are SMDS Group Address, SMDS ARP Req
Address, and MAC address. Refer to Configuring IP Services for information
about IP these parameters.

3. Add a new IP interface with a unique IP subnetwork address. This

address should include a network/subnet and host address.

4. Enter a new Group Address, ARP Address, and Individual Address for

this new IP interface.

The IP interface parameters override these same parameters in the SMDS
configuration for this and subsequent IP interfaces.

Configuring Synchronous Lines for SMDS

2-10

If you enable SMDS on a circuit, Site Manager automatically sets the following
synchronous line parameters.

Table 2-1. Synchronous Line Parameter Settings for SMDS

Parameter Value

BOFL Disable
Promiscuous Enable
Service Transparent
WAN Protocol SMDS

For more information on these parameters, refer to Configuring Routers or
Configuring Customer Access and Trunks (BNX Software), depending on the type

of installed software.

Chapter 3

Enabling SMDS

This chapter provides information on how to enable SMDS. It assumes you have
read Configuring Routers or Configuring Customer Access and Trunks (BNX
Software), depending on the type of installed software, and that you have

1. Opened a configuration file

2. Specified router hardware, if this is a local mode configuration file

3. Selected the link or net module connector on which you are enabling SMDS

When you enable SMDS, you need to configure only a few parameters. The
Configuration Manager supplies default values for the remaining parameters. If
you want to edit these default values, refer to Chapter 4 for instructions.

Using the MIB Object ID

For each parameter, this chapter and Chapter 4 include default settings, valid
parameter options, the parameter function, instructions for setting the parameter,
and the Management Information Base (MIB) object ID.

The Technician Interface allows you to modify parameters by issuing set and
commit commands with the MIB object ID. This process is equivalent to
modifying parameters using Site Manager. For more information about using the
Technician Interface to access the MIB, refer to Using Technician Interface
Software.

Caution: The Technician Interface does not verify that the value you enter for

a parameter is valid. Entering an invalid value can corrupt your
configuration.

3-1

Configuring SMDS Services

Enabling SMDS on an Interface

To enable SMDS on an interface, complete the following steps.

1. Select SMDS from the WAN Protocols menu; this menu appears after

you select a link or net module connector that requires a WAN circuit.

Site Manager automatically enables protocol prioritization when you select
SMDS. For detailed information on protocol prioritization, refer to

Configuring Traffic Filters and Protocol Prioritization.

2. Click on OK to enable default SMDS.

The Configuration Manager displays the SMDS Configuration window
(Figure 3-1).

3. Configure the SMDS parameters (Individual Address, Group Address,

and ARP Address) using the descriptions that follow as a guide.

4. When you have configured all the parameters, you can do one of the

following:

— Enable default SMDS. To do this, click on OK.
— Edit the default values. To do this, click on Details. (Refer to Chapter 4

for instructions.)

3-2

Figure 3-1. SMDS Configuration Window

Parameter: Individual Address

Default: C1FFFFFFFFFFFFFF

Options: A complete SMDS E.164 address specified by the SMDS subscription

agreement that you have with your SMDS provider

Function: Provides a MAC-layer address.

Instructions: Enter the complete SMDS E.164 address, for example,

C15082348734FFFF.
To configure this parameter for a multigroup or multinet configuration,

refer to Chapter 2 for instructions. For information about IP, refer to

Configuring IP Services.

MIB Object ID: 1.3.6.1.4.1.18.3.5.9.3.1.5

Parameter: Group Address

Default: E1FFFFFFFFFFFFFF

Options: A complete SMDS E.164 address specified by the SMDS subscription

agreement that you have with your SMDS provider

Enabling SMDS

Function: Provides a MAC-layer multicast address for this SMDS interface.

Instructions: Enter the complete SMDS E.164 group address, for example,

E16175552876FFFF.
To configure this parameter for a multigroup or multinet configuration,

refer to Chapter 2 for instructions. For information about IP, refer to

Configuring IP Services.

MIB Object ID: 1.3.6.1.4.1.18.3.5.9.3.1.6

3-3

Configuring SMDS Services

Parameter: ARP Address

Default: E1FFFFFFFFFFFFFF

Options: A complete SMDS E.164 address specified by the SMDS subscription

agreement that you have with your SMDS provider

Function: Provides an address resolution multicast address.

Instructions: Enter the complete SMDS E.164 address, for example,

E16175552876FFFF.
To configure this parameter for a multigroup or multinet configuration,

refer to Chapter 2 for instructions. For information about IP, refer to

Configuring IP Services.

MIB Object ID: 1.3.6.1.4.1.18.3.5.9.3.1.7

3-4

Chapter 4

Editing SMDS Parameters

This chapter provides details on how to edit SMDS parameters for the SMDS
interfaces on your router.

Note: You must have already configured at least one SMDS interface on the

router in order to edit SMDS parameters. If you have not yet configured an
SMDS interface, or want to add additional SMDS interfaces, see Configuring
Routers or Configuring Customer Access and Trunks (BNX Software),
depending on the type of installed software.

Access SMDS parameters from the Configuration Manager window (Figure 4-1).
Refer to Configuring Routers or Configuring Customer Access and Trunks (BNX
Software), depending on the type of installed software, for instructions on how to
access this window.

4-1

Configuring SMDS Services

Figure 4-1. Configuration Manager Window

Editing SMDS Interface Parameters

To edit SMDS interface parameters, follow these steps:

1. Begin at the Configuration Manager window (Figure 4-1).

2. Select Protocols➔SMDS➔Interfaces.

The Configuration Manager displays the SMDS Interface List window
(Figure 4-2).

4-2

Editing SMDS Parameters

Figure 4-2. SMDS Interface List Window

Select the interface you want to edit from the scroll box in the SMDS

3.

Interface List window.

4. Edit the parameters, referring to the parameter descriptions following

this procedure.

5. Click on Apply to save your changes when you are finished. Repeat Steps

3 through 5 for each SMDS interface you want to edit.

6. Click on Done to exit.

4-3

Configuring SMDS Services

SMDS Interface Parameter Descriptions

Use the following descriptions as guidelines when you edit the SMDS interface
parameters.

Parameter: Enable

Default: Enable

Options: Enable

Function: Enables or disables SMDS on this interface.

Instructions: Set to Disable if you want to temporarily disable SMDS on this interface,

rather than delete it. Set this parameter to Enable if you want to re-enable
SMDS.

MIB Object ID: 1.3.6.1.4.1.18.3.5.9.3.1.2

Parameter: Individual Address

Default: C1FFFFFFFFFFFFFF

Options: A complete SMDS E.164 address specified by the SMDS subscription

agreement that you have with your SMDS provider

Function: Provides a MAC-layer address. The Configuration Manager fills in this

field based on your original SMDS interface configuration.

Instructions: Enter the new SMDS E.164 address, for example, C15085558734FFFF.

To configure this parameter for a multinet or multigroup configuration,
refer to Chapter 2 for instructions.

MIB Object ID: 1.3.6.1.4.1.18.3.5.9.3.1.5

| Disable

4-4

Editing SMDS Parameters

Parameter: Group Address

Default: E1FFFFFFFFFFFFFF

Options: A complete SMDS E.164 address specified by the SMDS subscription

agreement that you have with your SMDS provider

Function: Provides a MAC-layer multicast address for this SMDS interface. The

Configuration Manager fills in this field based on your original SMDS
interface configuration.

Instructions: Enter the new SMDS E.164 group address, for example,

E16175552876FFFF.
To configure this parameter for a multinet or multigroup configuration,

refer to Chapter 2 for instructions.

MIB Object ID: 1.3.6.1.4.1.18.3.5.9.3.1.6

Parameter: ARP Address

Default: E1FFFFFFFFFFFFFF

Options: A complete SMDS E.164 address specified by the SMDS subscription

agreement that you have with your SMDS provider

Function: Provides an address resolution multicast address. The Configuration

Manager fills in this field based on your original SMDS interface
configuration.

Instructions: Enter the new SMDS E.164 address, for example, E16175552876FFFF.

To configure this parameter for a multinet or multigroup configuration,
refer to Chapter 2 for instructions.

MIB Object ID: 1.3.6.1.4.1.18.3.5.9.3.1.7

4-5

Configuring SMDS Services

Parameter: Heartbeat Poll

Default: Enable

Options: Enable

Function: Enables or disables DXI heartbeat polling.

DXI Version 3.2 provides a heartbeat polling mechanism, which verifies
the integrity of the router/DSU connection. To implement heartbeat
polling, the router transmits a constant stream of keep-alive messages to
the DSU. The DSU, in turn, sends an acknowledgment to the router.

Instructions: Set to Enable to enable heartbeat polling. Set to Disable if the DSU/CSU

in your network does not support heartbeat polling.

MIB Object ID: 1.3.6.1.4.1.18.3.5.9.3.1.8

Parameter: Heartbeat Poll Interval

Default: 10 seconds

Range: 6 to 1023 seconds

Function: Specifies the time interval between each heartbeat poll message that the

router transmits. If you disable heartbeat polling, this parameter is
nonfunctional.

Instructions: Enter the number of seconds between the transmission of heartbeat poll

messages. Be sure to set the Heartbeat Poll Interval parameter to a value
greater than 5 seconds, the length of the heartbeat poll acknowledgment
timer. We recommend that you accept the default value.

| Disable

MIB Object ID: 1.3.6.1.4.1.18.3.5.9.3.1.9

4-6

Editing SMDS Parameters

Parameter: Heartbeat Poll Down Count

Default: 3 messages

Range: 1 to 1023 messages

Function: Specifies the number of heartbeat poll messages that the router will send

without acknowledgment from the DSU before it declares the router/DSU
connection down. If you disable heartbeat polling, this parameter is
nonfunctional.

Instructions: Set to the number of unacknowledged heartbeat poll messages that the

router will tolerate before taking the router/DSU connection down. We
recommend that you accept the default.

MIB Object ID: 1.3.6.1.4.1.18.3.5.9.3.1.10

Parameter: LMI Network Mgmt

Default: Disable

Options: Enable

Function: Enables or disables LMI network management.

LMI works with DXI Version 3.2. LMI is an SNMP-like protocol that
enables the router and the DSU/CSU to exchange management
information.

Instructions: Set to Enable to enable the LMI protocol. Set to Disable if the DSU/CSU

in your network does not support the LMI.

MIB Object ID: 1.3.6.1.4.1.18.3.5.9.3.1.11

| Disable

4-7

Configuring SMDS Services

Parameter: Enable Incoming Address Screening

Default: Disable

Options: Enable

Function: Enables the router to verify the Individual and Group addresses that it

receives in the incoming frames and drop any improperly addressed
frames. It ensures that the router receives only traffic intended for it.

If the router rejects an address, one of three things may be happening:
– You did not configure the SMDS addresses according to the numbers

– The network is forwarding traffic to the router unnecessarily. Notify

– If the router shares a network entry point with another device, the

Instructions: Enter Enable if you want the router to check incoming addresses and

control the calls it receives. If not, accept the default, Disable. To
determine whether the router is rejecting addresses, use the Technician
Interface to look under the object wfSmdsCircuitEntry at the attribute

wfSmdsCircuitAddrVerifyDiscards. Refer to Using Technician Interface
Software for more information.

MIB Object ID: 1.3.6.1.4.1.18.3.5.9.3.1.17

| Disable

the service provider assigned.

the network provider.

router may be receiving that device’s traffic.

Deleting SMDS from the Router

4-8

To delete SMDS from all router circuits, complete the following steps:

1. From the Configuration Manager window (refer to Figure 4-1), select

Protocols➔SMDS➔Delete SMDS.

The Configuration Manager prompts

Do you REALLY want to delete SMDS?

2. Click on OK.

The Configuration Manager returns you to the Configuration Manager
window. SMDS is no longer configured on the router.

Appendix A

SMDS Default Settings

This appendix lists the default settings for SMDS. Use the Configuration Manager
to edit any of the default settings listed here.

Table A-1. SMDS Interface Parameters

Parameter Default

Enable Enable
Individual Address C1FFFFFFFFFFFFFF
Group Address E1FFFFFFFFFFFFFF
ARP Address E1FFFFFFFFFFFFFF
Heartbeat Poll Enable
Heartbeat Poll Interval 10 seconds
Heartbeat Poll Down Count 3 messages
LMI Network Mgmt Disable
Enable Incoming Address Screening Disable

A-1

A

access classes for SMDS, 1-2
addresses

group, 1-7

used for multigroup, 2-7
used for multinet, 2-5

individual, 1-7

used for multigroup, 2-7
used for multinet, 2-5

ARP Address parameter, 3-4, 4-5

B

Bay Networks

CompuServe forum, xiii
customer support, xii
Home Page on World W ide Web, xiv
InfoFACTS service, xiv
publications, ordering, xv
Technical Response Center, xiv

C

CompuServe, Bay Networks forum on, xiii
connections to router, 2-1
connectivity using heartbeat polling, 2-3
customer support. See getting help
cyclic-redundancy check (CRC) values, 2-3

D

Data Exchange Interface (DXI) protocol

description, 1-4
requirements for SMDS

Index

version supported, 2-3
defaults for SMDS parameters, A-1
deleting SMDS from the router, 4-8
DSU/CSU

configuration requirements for, 2-3
role in SMDS network, 1-4

E

E.164 addresses for SMDS, 1-3
Enable Incoming Address Screening parameter,

4-8
Enable parameter, 4-4
enabling SMDS, 3-1 to 3-4

G

getting help

from a Bay Networks Technical Response

Center, xiv

through CompuServe, xiii
through InfoFACTS service, xiv
through W orld W ide Web, xiv

Group Address parameter, 3-3, 4-5

H

Heartbeat Poll Down Count parameter, 4-7
Heartbeat Poll Interval parameter, 4-6
heartbeat poll messages, 2-4
Heartbeat Poll parameter, 4-6
heartbeat polling for connections, 2-3

Index-1

high-speed serial interface (HSSI) connections,

2-1

high-speed SMDS

description, 1-2
implementing, 2-1

I

IEEE Standard 802.6

used by SMDS, 1-1
implementation notes, 2-1 to 2-10
Individual Address parameter, 3-3, 4-4
InfoFACTS service, xiv
information sources on SMDS, 1-7

L

P

parameters

ARP Address, 3-4, 4-5
editing, 4-1 to 4-7
Enable, 4-4
Enable Incoming Address Screening, 4-8
Group Address, 3-3, 4-5
Heartbeat Poll, 4-6
Heartbeat Poll Down Count, 4-7
Heartbeat Poll Interval, 4-6
Individual Address, 3-3, 4-4
LMI Network Mgmt, 4-7

protocol data unit (PDU)

assembly, 1-5
definition, 1-3

protocols supported by SMDS, 2-4

line configuration. See synchronous line

configuration
LMI Network Mgmt parameter, 4-7
Local Management Interface (LMI)

enabling, 4-7
purpose of, 2-3

low-speed SMDS

description of, 1-2
implementing, 2-1

M

MIB object ID, 3-1
multigroup

description, 2-7
sample configuration, 2-8
setting parameters for, 2-10

multinet

description, 2-5
sample configuration, 2-5
setting parameters for, 2-7

R

router requirements for SMDS, 2-3

S

SMDS

access classes description, 1-2
addresses, 1-7
defaults, A-1
deleting from the router, 4-8
enabling, 3-1 to 3-4
implementation notes, 2-1 to 2-10
information sources, 1-7
LMI, 2-3
overview of, 1-1 to 1-7
router requirements for, 2-3
sending data over WANs, 1-2
supported protocols, 2-4

SMDS Interface Protocol (SIP)

definition, 1-3
speeds for SMDS, 1-2
subscriber network interface (SNI) definition,

1-2, 2-1

Index-2

Switched Multi-megabit Data Service. See

SMDS

synchronous line configuration, 2-10

W

World Wide Web, Bay Networks Home Page on,

xiv

Index-3