Avaya SDLC User Manual

Configuring SDLC Services

Router Software Version 10.0

Site Manager Software Version 4.0

Part No. 112921 Rev. A

January 1996

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(continued)

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Contents

About This Guide

Audience ...........................................................................................................................xi

Before You Begin .............................................................................................................. xi

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

CompuServe ..............................................................................................................xii

InfoFACTS ................................................................................................................. xiii

World Wide Web ........................................................................................................xiii

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

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

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

Acronyms ......................................................................................................................... xv

Chapter 1 Synchronous Data Link Control Overview

SDLC Networking ...........................................................................................................1-1

SDLC Features ...............................................................................................................1-2

Link Station Roles ....................................................................................................1-2

Transmission Capabilities .........................................................................................1-2

Physical Connections ...............................................................................................1-3

Frame Format ...........................................................................................................1-3

Using APPN Services with SDLC ...................................................................................1-4

Using DLSw Services with SDLC ...................................................................................1-4

For More Information about SDLC ..................................................................................1-4

Chapter 2 SDLC Implementation Notes

Link Stations ...................................................................................................................2-1

Synchronous Line Parameters .......................................................................................2-1

SDLC Timers ..................................................................................................................2-2

Conﬁgurable Window Size ..............................................................................................2-2

Chapter 3 Enabling SDLC Services

Enabling SDLC on an Interface ......................................................................................3-1

SDLC Line Parameter Descriptions ................................................................................3-3

Chapter 4 Editing SDLC Parameters

Using the Parameter Descriptions ..................................................................................4-1

Accessing SDLC Parameters .........................................................................................4-2

Editing SDLC Global Parameters ...................................................................................4-3

Editing SDLC Interface Parameters ................................................................................4-4

SDLC Interface Parameter Descriptions ..................................................................4-6

Deleting an SDLC Interface ..........................................................................................4-14

Adding an SDLC Link Station .......................................................................................4-15

Editing SDLC Link Station Parameters .........................................................................4-17

SDLC Link Station Parameter Descriptions ...........................................................4-18

Deleting SDLC from the Router ....................................................................................4-27

Appendix A SDLC Default Parameter Settings

Index

Figures

Figure 1-1. SDLC Frame Format ................................................................................1-3

Figure 3-1. SDLC Line Parameters Window ..............................................................3-2

Figure 3-2. Select Protocols Window .........................................................................3-2

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

Figure 4-2. Edit SDLC Global Parameters Window ....................................................4-3

Figure 4-3. SDLC Interface Conﬁguration Window ....................................................4-5

Figure 4-4. SDLC Link Station Conﬁguration Window ..............................................4-15

Figure 4-5. Link Station Conﬁguration Window ........................................................4-16

vii

Tables

Table A-1. SDLC Line Parameters ........................................................................... A-1

Table A-2. SDLC Interface Parameters .................................................................... A-2

Table A-3. SDLC Link Station Parameters ............................................................... A-3

Audience

About This Guide

If you conﬁgure and manage Synchronous Data Link Control (SDLC) services for Bay Networks routers, refer to this guide for

• An overview of the SDLC protocol and its client protocols (Chapter 1)

• Implementation notes that may affect how you conﬁgure SDLC services (Chapter 2)

• Instructions on enabling SDLC services on the router (Chapter 3)

• Instructions on editing SDLC parameters (Chapter 4)

For information and instructions on starting up and managing Bay Networks router conﬁgurations, refer to

Conﬁguring Routers

Written for system and network managers, this guide describes the Bay Networks implementation of SDLC for networks containing Bay Networks routers. You should be familiar with the IBM networking concepts associated with the Systems Network Architecture (SNA) and SDLC.

Before Y ou Begin

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

• Open a conﬁguration ﬁle.

• Specify the router hardware, if this is a local-mode conﬁguration ﬁle.

• Select the link- or net-module connector on which you are enabling SDLC.

Refer to

Conﬁguring Routers

for instructions.

Configuring SDLC Services

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.

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 (408) 764-1000. 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.

CompuServe

xii

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.

InfoFACTS

About This Guide

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 (614) 529-1349 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.

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. Y ou 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.

xiii

Configuring SDLC Services

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. 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

Indicates data that appears on the screen. Example:

Bay Networks Trap Monitor Filters

Set

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

, but not both.

xiv

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: 1-800-845-9523 FAX - U.S./Canada: 1-800-582-8000 FAX - International: 1-916-939-1010

Acronyms

AN Access Node APPC Advanced Peer-to-Peer Communications APPN Advanced Peer-to-Peer Networking ASN Access Stack Node CP Control Point DLSw Data Link Switching FEP front-end processor IEEE Institute of Electrical and Electronic Engineers LAN local area network LLC logical link control MAC Media Access Control NetBIOS Network Basic Input-Output System NRZ non-return to zero NRZI non-return to zero inverted PDU protocol data unit PU physical unit RFC Request for Comments SAP service access point SDLC Synchronous Data Link Control SNA Systems Network Architecture (IBM) SNMP Simple Network Management Protocol XID exchange identiﬁcation

About This Guide

Chapter 1

Synchronous Data Link Control Overview

This chapter describes the following Synchronous Data Link Control (SDLC) features and services:

• SDLC networking — Link stations — Transmission capabilities — Physical connections — Frame format

• Using APPN and DLSw services with SDLC

Read this chapter if you are conﬁguring Advanced Peer-to-Peer Networking (APPN) or Data Link Switching (DLSw) networks. SDLC parameter settings can inﬂuence APPN and DLSw performance.

SDLC Networking

SDLC is the synchronous, bit-oriented link control protocol in the IBM System Network Architecture (SN A). SDLC’ s connection-oriented protocol operates with the Data Link Switching (DLSw) protocol and the Advanced Peer-to-Peer Networking (APPN) architecture.

SDLC supports point-to-point and multipoint topologies. In point-to-point topologies, one SDLC device is connected to the SDLC port. In multipoint topologies, several SDLC devices are connected to the SDLC port via a modemsharing device.

1-1

Configuring SDLC Services

SDLC Features

You can conﬁgure most of the following features using the SDLC parameters described in Chapter 4.

Link Station Roles

A link station is a logical connection between adjacent nodes, where one node is a primary link station and the other node is a secondary link station. Only one link station on an SDLC line can be the primary station; all other stations on the line must be secondary.

SDLC supports primary, secondary, and negotiable link stations. A primary link station does the following:

• Controls a data link

• Issues commands

• Initiates error-recovery procedures

A secondary link station receives commands and responds to primary link station polls.

In DLSw conﬁgurations, a Bay Networks router must be conﬁgured as a primary or a secondary link station. When conﬁgured as a primary SDLC link station, the router communicates with downstream PU 2.0 and PU 2.1 nodes. When conﬁgured as a secondary SDLC link station, the router communicates with PU 4, PU 5, and PU 2.1 devices.

In APPN conﬁgurations (PU 2.1 devices only), a Bay Networks router supports negotiable link stations, where the two link stations exchange XIDs to negotiate which one will be primary and which secondary.

Transmission Capabilities

SDLC supports full- and half-duplex transmissions over leased lines. With fullduplex, data transmissions can occur in both directions (between primary and secondary link stations) at the same time. With half-duplex, transmissions can occur in only one direction at a time.

1-2

Physical Connections

SDLC supports communication with attached SNA/SDLC devices using V.24 (RS-232), V.35, and X.21 (nonswitched) connections. SDLC supports line speeds up to 64 Kb/s, depending on the physical connection. For example, V.24 interfaces can operate at speeds up to 19.2 Kb/s, while V.35 interfaces can operate at speeds up to 64 Kb/s.

Frame Format

SDLC sends and receives three types of frames:

•

Supervisory frames

retransmission when an error occurs or when frames arrive out of sequence.

•

Information frames

•

Unnumbered frames

Figure 1-1 illustrates the format of SDLC frames.

Synchronous Data Link Control Overview

transmit ready or busy status, control polling, and request

transmit data.

control initialization and status reporting.

Flag Address Field Control Field

Figure 1-1. SDLC Frame Format

Information Field

Frame Checking Field

Flag

Each frame begins with a one-byte ﬂag that alerts the receiver to the frame’s presence.

The Address ﬁeld can be one or tw o bytes long. This ﬁeld identiﬁes the secondary link station that is communicating with the primary link station. In a poll, the Address ﬁeld identiﬁes the station being polled. In a response, this ﬁeld identiﬁes the transmitting secondary station.

The Control ﬁeld is one byte long and identiﬁes the function of the frame. This ﬁeld deﬁnes the frame format (supervisory, information, or unnumbered).

The optional Information ﬁeld is a variable-length ﬁeld (the length must be a multiple of eight bits).

1-3

Configuring SDLC Services

A two-byte Frame-checking ﬁeld lets the receiving station check the received frame for errors.

A one-byte ﬂag ends the frame.

Using APPN Services with SDLC

You can conﬁgure any SDLC interface for APPN services. APPN nodes can communicate with adjacent nodes using SDLC links over point-to-point and multipoint conﬁgurations. For information on the APPN node types and how to conﬁgure APPN, see

Conﬁguring APPN Services

Using DLSw Services with SDLC

You can conﬁgure any SDLC interface for DLSw services. For information on DLSw, see

Conﬁguring DLSw Services

For More Information about SDLC

For more information about SDLC and IBM SNA, refer to the following IBM publications:

1-4

•

IBM Synchronous Data Link Control: Concepts

•

IBM System Network Architecture: Technical Overview

•

IBM System Network Architecture: Concepts and Products

•

Systems Network Architecture APPN Architecture Reference

•

APPN Architecture and Product Implementations Tutorial

• Data Link Switching: Switch-to-Switch Protocol RFC 1434

(GA27-3093)

(GC30-30723)

(GC30-3072)

(SC30-3422-3)

(GG24-3669)

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