Avaya SDLC User Manual

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Configuring SDLC Services

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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.

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• 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)

Keep the following implementation notes in mind when you conﬁgure SDLC services.

Link Stations

With DLSw, you can conﬁgure SDLC as a primary or secondary link station only. With APPN, you can conﬁgure primary, secondary, and negotiable link stations.

You set up SDLC link stations as follows:

• For primary link stations, you must conﬁgure the adjacent link station’s

Chapter 2

SDLC Implementation Notes

parameters.

• For secondary link stations, you must conﬁgure the station’s own link station parameters.

• F or negotiable link stations, you must conﬁgure the station’s own link station parameters, as well as the parameters for a potential adjacent link station.

Refer to Chapter 4 for information on conﬁguring SDLC link stations.

Synchronous Line Parameters

When you add SDLC to a synchronous line, Site Manager opens the SDLC Line Parameters window, which allows you to edit the following parameters:

• Clock Source

• Internal Clock Speed

• Sync Line Coding

• Cable Type

2-1

Configuring SDLC Services

• RTS Enable

Chapter 3 describes how to complete the SDLC Line Parameters windo w. To vie w or change synchronous line parameters that do not appear in the SDLC Line Parameters window, edit the line parameters of the desired circuit. For information on editing other synchronous line parameters, refer to

Line Services

Note:

The BOFL (Breath of Life) parameter enables the transmission of proprietary Breath of Life messages over a point-to-point connection between the local router and a remote peer. Disable this parameter so that the BOFL messages do not interfere with SDLC frames.

SDLC Timers

SDLC uses timers to manage trafﬁc over SDLC links. If you conﬁgure SDLC on a link with a slow baud rate, the default values for SDLC timer parameters may not be adequate for the line. You should edit the timer values whenever you adjust the speed of the line.

Conﬁguring

For example, if you are using a line with a 4800 baud rate, increase the REPLYTO Timer parameter value in the SDLC Link Station Conﬁguration window (refer to Figure 4-4) to 60 tenths of a second. Edit the REPLYTO Timer value whenever you adjust baud rate with the Internal Clock Speed parameter or the external modem baud rate.

Conﬁgurable Window Size

In SDLC, a window controls the number of frames that a link station can send before it receives an acknowledgment. The size of the window depends on the modulo in use in your network’s implementation of SDLC. Modulo 8 operation allows a maximum window size of 7. Modulo 128 operation allows a maximum window size of 127.

For example, with a window size of 7, a link station can transmit frames 0 through 6 before requiring acknowledgment from the receiving station. The sending station will not send more frames until it receives an acknowledgment.

You edit this window size with the MAXOUT parameter, described in Chapter 4.

2-2

Chapter 3

Enabling SDLC Services

This chapter describes how to enable SDLC services. It assumes you have read

Conﬁguring Routers

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 SDLC,

or conﬁgured a WAN circuit if this connector requires one.

When you enable SDLC services, you are required to specify only a few parameters. The Conﬁguration Manager supplies default values for the rest. If you want to edit these parameters, refer to Chapter 4.

and that you have completed the following steps:

Enabling SDLC on an Interface

To enable SDLC on an interface:

Select SDLC in the WAN Protocols window.

The Conﬁguration Manager displays the SDLC Line Parameters window (Figure 3-1).

3-1

Configuring SDLC Services

Figure 3-1. SDLC Line Parameters Window

3-2

Conﬁgure the parameters.

Refer to the parameter descriptions in this chapter to conﬁgure the synchronous line parameters.

Click on OK.

The Select Protocols window appears (Figure 3-2).

Figure 3-2. Select Protocols Window

Select either DLSw or APPN to run on the SDLC circuit.

Site Manager then displays the appropriate windows from which you enable APPN or DLSw. For information on enabling APPN and DLSw, refer to

Conﬁguring APPN Services

and

SDLC Line Parameter Descriptions

Use the following parameter descriptions to conﬁgure the SDLC line parameters (Figure 3-1).

Parameter: Clock Source

Default: Internal

Options: External | Internal

Function: Speciﬁes the origin of the synchronous timing signals. If you set this

parameter to Internal, this router supplies the required timing signals. If you set this parameter to External, an external network device supplies the required timing signals. If you are using a modem, or if the adjacent link station is providing the clock source, set this parameter to External.

Enabling SDLC Services

Conﬁguring DLSw Services.

Instructions: Set this parameter to either Internal or External, as appropriate for your

network.

MIB Object ID: 1.3.6.1.4.1.18.3.4.5.1.13

3-3

Configuring SDLC Services

Parameter: Internal Clock Speed

Default: 64 KB

Options: 1200 B | 2400 B | 4800 B | 7200 B | 9600 B | 19200 B | 32000 B |

38400 B | 56 KB | 64 KB | 125 KB | 230 KB | 420 KB | 625 KB | 833 KB | 1.25 MB | 2.5 MB | 5 MB

Function: Sets the clock speed of an internally supplied clock when the Clock

Source parameter is set to Internal.

Instructions: Click on Values and set the clock speed for the internal clock to the

desired data transmission rate across the synchronous line. If you are using the Quad Sync module, be sure to set the same clock speed on all ports.

You cannot edit the Internal Clock Speed parameter when the Clock Source parameter is set to External.

MIB Object ID: 1.3.6.1.4.1.18.3.4.5.1.14

Parameter: Sync Line Coding

Default: NRZ

Options: NRZ | NRZI | NRZI Mark

Function: Speciﬁes the line coding of the physical synchronous line. You must

change the value to match the line coding of a device at the other end of the line.

This parameter is relevant only for the AN and ASN routers, and routers containing the Octal Sync link module.

NRZ — Indicates Non-Return to Zero coding NRZI — Indicates Non-Return to Zero Inverted coding NRZI Mark — Indicates Non-Return to Zero Inverted Mark coding

Instructions: Select the appropriate value for synchronous line coding.

MIB Object ID: 1.3.6.1.4.1.18.3.4.5.1.88

3-4

Enabling SDLC Services

Parameter: Cable Type

Default: Null

Options: Null | RS232 | RS422 | V35 | X21

Function: Speciﬁes the cable interface type of the device.

Instructions: Click on Values and select the installed cable interface type.

MIB Object ID: 1.3.6.1.4.1.18.3.4.5.1.83

Parameter: RTS Enable

Default: Disable

Options: Enable | Disable

Function: Controls the toggling of the Request to Send (RTS) signal on the

interface. For manual dial modems (2-wire), set this parameter to Enable. For leased modems (4-wire), set this parameter to Disable.

Instructions: Click on Values and select Enable or Disable.

MIB Object ID: 1.3.6.1.4.1.18.3.4.5.1.16

3-5

Chapter 4

Editing SDLC Parameters

Use the Conﬁguration Manager to access, conﬁgure, and edit

• SDLC global parameters

• SDLC interface parameters

• SDLC link station parameters To edit SDLC parameters, you need to conﬁgure one SDLC interface. If you have

not yet conﬁgured an SDLC interface, refer to Chapter 3. You may want to customize parameters for DLSw or APPN as well, since they use

SDLC services on the router. For information on DLSw, refer to Conﬁguring DLSw Services. For information on APPN, refer to Conﬁguring APPN Services.

Using the Parameter Descriptions

For each SDLC parameter, this chapter provides the following information:

• Default setting (parameter value that the system software sets; APPN and

DLSw conﬁgurations may affect some SDLC default settings during operation)

• All valid options

• Function

• Instructions for setting the parameter value

• Management Information Base (MIB) object ID

4-1

Configuring SDLC Services

The Technician Interface lets you 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.

Accessing SDLC Parameters

T o access and edit SDLC parameters, begin at the Conﬁguration Manager windo w and select Protocols➔SDLC to display the SDLC options submenu (Figure 4-1).

4-2

Figure 4-1. Conﬁguration Manager Window

Editing SDLC Global Parameters

SDLC has only one conﬁgurable parameter (Enable) visible at the global level. To change the setting of the global parameter, begin at the Conﬁguration Manager window and proceed as follows:

1. Select Protocols➔SDLC➔Global.

The Edit SDLC Global Parameters window appears (Figure 4-2).

Editing SDLC Parameters

Figure 4-2. Edit SDLC Global Parameters Window

Change the setting of the Enable parameter, if necessary.

(Refer to the description of the parameter that follows this procedure.)

3. Click on OK to save your changes and exit the window.

4-3

Configuring SDLC Services

Parameter: Enable

Default: Enable

Options: Enable | Disable

Function: Enables or disables the system software mechanisms that use the SDLC

interface on a synchronous circuit. The system software also performs the following actions when you

choose a setting: Disable — Switches every SDLC interface enabled on the router to the

disabled (inactive) state. Enable — Reinitializes every SDLC interface on the router based on

• The current setting of the associated interface Enable parameter

• The current state of the associated circuit

Instructions: Select Disable to switch ev ery SDLC interface e xisting on the node to the

inactive state. Select Enable only when an existing SDLC interface is in the disabled

state. You can choose Enable to globally reinitialize all SDLC interfaces conﬁgured on the node. Then, each interface maintains the most recent setting of its own interface Enable parameter.

MIB Object ID: 1.3.6.1.4.1.18.3.5.1.7.1.2

Editing SDLC Interface Parameters

To access and edit the SDLC interface parameters, begin at the Conﬁguration Manager window (refer to Figure 4-1) and proceed as follows:

1. Select Protocols➔SDLC➔Interfaces.

The SDLC Interface Conﬁguration window appears (Figure 4-3).

4-4

Editing SDLC Parameters

Figure 4-3. SDLC Interface Conﬁguration Window

Select the interface you want to customize.

The parameter values for that interface appear in the parameter value windows. (Click on Values to display the valid range of values for any parameter.)

3. Edit the parameters you want to change.

Refer to the parameter descriptions in the next section.

4. Click on Apply to save your changes.

Repeat Steps 2 through 4 for each interface you want to edit.

5. Click on Done to exit the SDLC Interface Conﬁguration window.

4-5

Configuring SDLC Services

SDLC Interface Parameter Descriptions

Use the following parameter descriptions to edit SDLC interface parameters.

Parameter: Enable

Default: Enable

Options: Enable | Disable

Function: Enables or disables the SDLC interface added previously to this WAN

physical circuit.

Instructions: Select Enable if you disabled this SDLC interface previously and now

want to re-enable the interface on its associated WAN physical circuit. Select Disable if you want to disable this SDLC interface on its associated

WAN physical circuit.

MIB Object ID: 1.3.6.1.4.1.18.3.5.1.7.2.1.2

Parameter: Port Name

Default: None

Options: Any valid port name

Function: Deﬁnes the port name you want to assign to this SDLC interface.

Instructions: Enter the name of the port you want to assign to this SDLC interface. You

can use any combination of alphanumeric characters. We recommend you use the same name assigned to the circuit on which you added SDLC, for example, S51.

MIB Object ID: 1.3.6.1.4.1.18.3.5.1.7.2.1.4

4-6

Editing SDLC Parameters

Parameter: Link Station Role

Default: PRIMARY

Options: PRIMARY | SECONDARY | NEGOTIABLE

Function: Deﬁnes the link station role. With DLSw, you can conﬁgure only primary

and secondary SDLC link stations. With APPN, you can conﬁgure primary, secondary, and negotiable link stations.

Instructions: Enter PRIMAR Y or SECOND ARY if you want to assign a speciﬁc role to

the link station. Enter NEGOTIABLE if you want the link station to exchange XIDs with another negotiable link station to determine which will be primary and which will be secondary.

MIB Object ID: 1.3.6.1.4.1.18.3.5.1.7.2.1.27

Parameter: Link Station Address

Default: 2

Range: 1 to 254

Function: Speciﬁes the address of the port if the link station role is secondary or

negotiable.

Instructions: Enter a value from 1 to 254.

MIB Object ID: 1.3.6.1.4.1.18.3.5.1.7.2.1.29

Parameter: Support Negotiable Connection

Default: FALSE

Options: TRUE | FALSE

Function: Speciﬁes whether this SDLC link station supports negotiable connections.

Instructions: Enter TRUE if the SDLC link station supports negotiable connections;

otherwise, enter FALSE.

MIB Object ID: 1.3.6.1.4.1.18.3.5.1.7.2.1.33

4-7

Configuring SDLC Services

Parameter: Max Frame Retransmit Count

Default: 5

Range: 1 to 7

Function: Speciﬁes the maximum number of times to retransmit a frame or group of

frames.

Instructions: Enter a value from 1 to 7.

MIB Object ID: 1.3.6.1.4.1.18.3.5.1.7.2.1.23

Parameter: Non-productive Timer

Default: 2000 milliseconds

Range: 1 to 65535

Function: Speciﬁes the time allowed for receipt of a valid frame from the primary

link station. This parameter operates with the Non-productive Retry Limit parameter.

SDLC primarily uses this timer to produce an outage when a secondary station produces continuous frames without setting the F-bit (Final bit).

Instructions: Enter a value from 1 to 65535.

MIB Object ID: 1.3.6.1.4.1.18.3.5.1.7.2.1.12

Parameter: Non-productive Retry Limit

Default: 15

Range: 1 to 65535

Function: Used with the Non-productive Timer parameter to provide the overall

time before SDLC sends an outage message to the device.

Instructions: Enter a value from 1 to 65535, where 1 causes SDLC to generate an

outage after the ﬁrst Non-productive Timer expires, and 65535 speciﬁes an unlimited retry count.

MIB Object ID: 1.3.6.1.4.1.18.3.5.1.7.2.1.13

4-8

Editing SDLC Parameters

Parameter: Idle Line Timer

Default: 6000 milliseconds

Range: 1 to 65535

Function: Speciﬁes the time used to determine whether a line is completely inactive.

This parameter operates with the Idle Line Retry Limit parameter.

Instructions: Enter a value from 1 to 65535. Enter the maximum value, 65535, if you

never want to terminate sessions on the line, even if it is completely inactive. If you enter a smaller value, the timer expires when no activity occurs on the line for the speciﬁed number of milliseconds.

MIB Object ID: 1.3.6.1.4.1.18.3.5.1.7.2.1.10

Parameter: Idle Line Retry Limit

Default: 20

Range: 1 to 65535

Function: Speciﬁes the number of times to run the Idle Line Timer before failure.

This parameter operates with the Idle Line Timer parameter to pro vide the overall idle timeout period.

Instructions: Enter a value from 1 to 65535, where 1 causes SDLC to generate an

outage after the ﬁrst Idle Line Timer expires, and 65535 speciﬁes an unlimited retry count.

MIB Object ID: 1.3.6.1.4.1.18.3.5.1.7.2.1.11

Parameter: Port Write T imer

Default: 3000 milliseconds

Range: 1 to 65535

Function: Speciﬁes the maximum amount of time allowed to transmit a complete

frame. This parameter operates with the Port Write Retry Limit parameter.

Instructions: Enter a value from 1 to 65535 milliseconds.

MIB Object ID: 1.3.6.1.4.1.18.3.5.1.7.2.1.14

4-9

Configuring SDLC Services

Parameter: Port Write Retry Limit

Default: 10

Range: 1 to 65535

Function: Used with the Port Write Timer parameter to provide the overall time

allowed to transmit a complete frame before SDLC sends an outage message to the device.

Instructions: Enter a value from 1 to 65535, where 1 causes SDLC to generate an

outage after the ﬁrst Port Write Timer expires, and 65535 speciﬁes an unlimited retry count.

MIB Object ID: 1.3.6.1.4.1.18.3.5.1.7.2.1.15

Parameter: Link Connection Timer

Default: 3000 milliseconds

Range: 1 to 65535

Function: Used with the Link Connection Retry Limit parameter to provide the time

interval after which SDLC fails to activate a port because it has not received a Data Set Ready (DSR) response.

This feature is for switched lines only and is not currently implemented.

Instructions: Accept the default. This parameter is reserved for future enhancements.

MIB Object ID: 1.3.6.1.4.1.18.3.5.1.7.2.1.16

Parameter: Link Connection Retry Limit

Default: 10

Range: 1 to 65535

Function: Speciﬁes the number of times the link has been tested for a connection

before it fails the pending activate port request. The maximum value for this parameter speciﬁes an inﬁnite number of times. This parameter operates with the Link Connection Timer parameter.

Instructions: Accept the default. This parameter is reserved for future enhancements.

MIB Object ID: 1.3.6.1.4.1.18.3.5.1.7.2.1.17

4-10

Editing SDLC Parameters

Parameter: Primary Full Duplex

Default: FALSE

Options: TRUE | FALSE

Function: Speciﬁes whether the primary SDLC link station supports full-duplex

data transmission.

Instructions: Enter TRUE if the primary SDLC station supports full-duplex data

transmission. Enter FALSE if the primary station supports half-duplex transmission.

MIB Object ID: 1.3.6.1.4.1.18.3.5.1.7.2.1.18

Parameter: Secondary Full Duplex

Default: FALSE

Options: TRUE | FALSE

Function: Speciﬁes whether the secondary SDLC link station supports full-duplex

data transmission.

Instructions: Enter TRUE if the secondary SDLC station supports full-duplex data

transmission. Enter FALSE if the secondary station supports half-duplex transmission.

MIB Object ID: 1.3.6.1.4.1.18.3.5.1.7.2.1.19

Parameter: Enable Reject Frame

Default: TRUE

Options: TRUE | FALSE

Function: Speciﬁes whether SDLC can send a reject (REJ) command upon

receiving an out-of-sequence Information frame. If the REJ command is not used, SDLC requests retransmission of frames through Receiver Ready (RR), Receiver Not Ready (RNR), or Information frames. Use of the REJ command is useful only with full-duplex transmission.

Instructions: Enter TRUE to use REJ commands for out-of-sequence Information

frames; otherwise, enter FALSE.

MIB Object ID: 1.3.6.1.4.1.18.3.5.1.7.2.1.20

4-11

Configuring SDLC Services

Parameter: Max XID Size

Default: 256

Range: 2 to 256

Function: Speciﬁes the maximum XID size that will be sent or recei ved on this link.

Instructions: Enter a value from 2 to 256.

MIB Object ID: 1.3.6.1.4.1.18.3.5.1.7.2.1.22

Parameter: Max Frame Size

Default: PDU2057

Options: PDU265 | PDU521 | PDU1033 | PDU2057

Function: Speciﬁes the maximum frame size SDLC supports. This value includes

the Transmission Header (TH) and Request Header (RH).

Instructions: Enter a frame size that is equal to or larger than the lar gest frame size that

will be received.

MIB Object ID: 1.3.6.1.4.1.18.3.5.1.7.2.1.24

Parameter: Total Link Station Limit

Default: 16

Range: 1 to 254

Function: Speciﬁes the total link station activation limit.

Instructions: Enter the total number of link stations (from 1 to 254) that you want to

reserve for inbound and outbound activation on this port.

MIB Object ID: 1.3.6.1.4.1.18.3.5.1.7.2.1.30

4-12

Editing SDLC Parameters

Parameter: Inbound Link Station Limit

Default: 8

Range: 1 to 254

Function: Speciﬁes the inbound link station activation limit.

Instructions: Enter the number of link stations (from 1 to 254) that you want to reserve

for inbound activation on this port.

MIB Object ID: 1.3.6.1.4.1.18.3.5.1.7.2.1.31

Parameter: Outbound Link Station Limit

Default: 8

Range: 1 to 254

Function: Speciﬁes the outbound link station activation limit.

Instructions: Enter the number of link stations (from 1 to 254) that you want to reserve

for outbound activation on this port.

MIB Object ID: 1.3.6.1.4.1.18.3.5.1.7.2.1.32

Parameter: Receive Buffer Pool Size

Default: 7

Range: 1 to 255

Function: Sets the receive b uffer pool size, that is, the number of b uf fers you want to

preallocate for receiving frames from the line.

Instructions: Enter the number of buffers you want for the receive b uffer pool. You can

enter a value from 1 to 255; however, we recommend that you accept the default, because increasing the receive buffer pool size uses up more memory.

MIB Object ID: 1.3.6.1.4.1.18.3.5.1.7.2.1.34

4-13

Configuring SDLC Services

Parameter: Initial Flow Control Credit

Default: 7

Range: 1 to 50

Function: Regulates the ﬂow of data from the SDLC device to the SDLC interface.

Instructions: Accept the default. This parameter is reserved for future enhancements.

MIB Object ID: 1.3.6.1.4.1.18.3.5.1.7.2.1.9

Parameter: Enable Stats Collection

Default: TRUE

Options: TRUE | FALSE

Function: Turns statistics collection on or off for this port.

Instructions: Enter TRUE to enable statistics collection; otherwise, enter FALSE.

MIB Object ID: 1.3.6.1.4.1.18.3.5.1.7.2.1.35

Deleting an SDLC Interface

4-14

To delete an SDLC interface from its associated physical circuit:

1. In the SDLC Interface Conﬁguration window (refer to Figure 4-3), select

the SDLC interface you want to delete.

2. Click on Delete.

The system deletes the SDLC entry you selected, and the entry disappears from the list of SDLC interfaces in the SDLC Interface Conﬁguration window.

To simultaneously delete all SDLC interfaces from the node, follow the steps in the section “Deleting SDLC from the Router.”

Adding an SDLC Link Station

To add an SDLC link station:

1. In the SDLC Interface Conﬁguration window (refer to Figure 4-3), select

Link Station.

The SDLC Link Station Conﬁguration window appears (Figure 4-4).

Editing SDLC Parameters

Figure 4-4. SDLC Link Station Conﬁguration Window

Click on Add.

A window prompts you for the address of the link station (Figure 4-5).

4-15

Configuring SDLC Services

Figure 4-5. Link Station Conﬁguration Window

Enter the link station address.

(Refer to the description of the parameter that follows this procedure.)

4. Click on OK to save your changes and exit the window.

The SDLC Link Station Conﬁguration window reappears (refer to Figure 4-4) with the new entry added to the list of existing link stations.

4-16

Complete the procedure in the next section, “Editing SDLC Link Station Parameters,” to deﬁne the conﬁguration information for the link station you just added.

Note: If you are using SDLC with DLSw, you must conﬁgure a local device for

each SDLC link station you add. For information on conﬁguring local devices, refer to Conﬁguring DLSw Services.

Parameter: Link Station Address (hex)

Default: None

Options: Any valid hexadecimal link station address from 0x01 to 0xFE

Function: Speciﬁes the address of the link station.

Instructions: Type 0x followed by the link station address.

MIB Object ID: None

Editing SDLC Link Station Parameters

To edit SDLC link station parameters, complete the following steps. If you just completed the procedure in “Adding an SDLC Link Station,” go to Step 3.

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

Protocols➔SDLC➔Link Stations.

The SDLC Link Station Conﬁguration window appears (refer to Figure 4-4).

2. Select the address of the link station.

3. Edit the link station parameter values.

Editing SDLC Parameters

For information, refer to the parameter descriptions in the next section.

4. Click on Apply to save your changes.

5. Click on Done to exit.

4-17

Configuring SDLC Services

SDLC Link Station Parameter Descriptions

Use the following descriptions as guidelines when you conﬁgure the parameters in the SDLC Link Station Conﬁguration window.

Parameter: Enable

Default: Enable

Options: Enable | Disable

Function: Enables or disables the link station on the port.

Instructions: Enter Enable to enable the link station on the port; otherwise, enter

Disable.

MIB Object ID: 1.3.6.1.4.1.18.3.5.1.7.5.1.2

Parameter: PU Name

Default: None

Options: Any valid 8-byte ASCII name

Function: Speciﬁes the physical unit (PU) name of the adjacent link station. This

name uniquely identiﬁes the adjacent link station for statistics and Alert messages.

Instructions: Enter the 8-byte ASCII link station name.

MIB Object ID: 1.3.6.1.4.1.18.3.5.1.7.5.1.32

Parameter: Group Address

Default: 0

Range: 0 to 254

Function: Speciﬁes the address of the group to which this link station belongs (for

secondary link stations only).

Instructions: If the link station is not part of a group (as is the case in a point-to-point

topology), accept the default, 0. If the link station is part of a group, enter its group poll address.

MIB Object ID: 1.3.6.1.4.1.18.3.5.1.7.5.1.5

4-18

Editing SDLC Parameters

Parameter: MAXDATA

Default: PDU2057

Options: PDU265 | PDU521 | PDU1033 | PDU2057

Function: Speciﬁes the maximum frame size SDLC supports. This value includes

the Transmission Header (TH) and Request Header (RH).

Instructions: Enter a maximum frame size equal to or larger than the lar gest frame size

the station will receive.

MIB Object ID: 1.3.6.1.4.1.18.3.5.1.7.5.1.7

Parameter: MAXOUT

Default: 7

Range: 1 to 127

Function: Controls the maximum number of consecutive frames that an SDLC link

station can send without acknowledgment.

Instructions: Enter a value from 1 to 127.

MIB Object ID: 1.3.6.1.4.1.18.3.5.1.7.5.1.10

Parameter: MAXIN

Default: 7

Range: 1 to 127

Function: Controls the maximum number of unacknowledged frames that an SDLC

link station can receive.

Instructions: Enter a value from 1 to 127.

MIB Object ID: 1.3.6.1.4.1.18.3.5.1.7.5.1.9

4-19

Configuring SDLC Services

Parameter: Response Timer

Default: 100 milliseconds

Range: 100 to 64000

Function: Speciﬁes the length of time that SDLC waits before turning the poll bit

around when it has no work to do.

Instructions: Enter a value from 100 to 64000 milliseconds.

MIB Object ID: 1.3.6.1.4.1.18.3.5.1.7.5.1.28

Parameter: RNR Timer

Default: 3 minutes

Range: 1 to 90

Function: Controls the length of time that an SDLC link station allows its adjacent

link station to remain in a busy (RNR) state before declaring it inoperative. This parameter operates with the RNR Retry Limit parameter.

Instructions: Enter a value from 1 to 90 minutes.

MIB Object ID: 1.3.6.1.4.1.18.3.5.1.7.5.1.15

Parameter: RNR Retry Limit

Default: 4

Range: 1 to 64000

Function: Used with the RNR Timer parameter to pro vide the ov erall timeout before

sending an outage message to a device.

Instructions: Enter a value from 1 to 64000, where 1 causes SDLC to generate an

outage after the ﬁrst RNR Timer expires, and 64000 speciﬁes an inﬁnite number of retries.

MIB Object ID: 1.3.6.1.4.1.18.3.5.1.7.5.1.27

4-20

Editing SDLC Parameters

Parameter: REPLYTO Timer

Default: 30 tenths of a second

Range: 1 to 600

Function: Speciﬁes the maximum length of time a primary link station waits for a

response frame (after sending a frame with a poll bit) before trying to poll another station. This timer starts when a frame without the F-bit is received, and stops only when a frame with an F-bit is received.

Instructions: Enter a value from one tenth of a second to 600 tenths of a second. You

should set the timeout value to be no less than the result of the following formula:

(2 + MAXOUT) x (MAXDATA x 8) x 10

÷ line speed in bits/s

MIB Object ID: 1.3.6.1.4.1.18.3.5.1.7.5.1.8

Parameter: REPLYTO Retry Limit

Default: 10

Range: 1 to 64000

Function: Controls the number of times an adjacent secondary link station fails to

respond before the primary link station sends an outage message.

Instructions: Enter a value from 1 to 64000, where 1 causes SDLC to generate an

outage after the ﬁrst REPLYTO Timer expires, and 64000 speciﬁes an inﬁnite number of retries.

MIB Object ID: 1.3.6.1.4.1.18.3.5.1.7.5.1.26

4-21

Configuring SDLC Services

Parameter: Fast Poll Timer

Default: 400 milliseconds

Range: 1 to 64000

Function: Controls the timeout required before reinserting an adjacent secondary

link station into the polling list after the adjacent secondary station has been removed for no response. This parameter operates with the F ast Poll Count Limit parameter.

Instructions: Enter a value from 1 to 64000 milliseconds. Although the timer v alue is in

milliseconds, you should specify a value so that the timer runs for seconds.

MIB Object ID: 1.3.6.1.4.1.18.3.5.1.7.5.1.22

Parameter: Fast Poll Count Limit

Default: 16

Range: 1 to 65535

Function: Controls the number of times a link station is removed from the polling

list on the normal poll timer before SDLC switches to the Slow Poll Timer. This parameter operates with the Fast Poll Timer parameter.

Instructions: Enter a value from 1 to 65535, where 1 causes SDLC to switch to the

Slow Poll Timer after the ﬁrst Fast Poll Timer expires, and 65535 speciﬁes an inﬁnite number of retries.

MIB Object ID: 1.3.6.1.4.1.18.3.5.1.7.5.1.23

Parameter: Slow Poll Timer

Default: 1000 milliseconds

Range: 1 to 64000

Function: Allows polling to continue (using this timer) when the Fast Poll Count

Limit expires. This parameter operates with the Slow Poll Count Limit parameter.

Instructions: Enter a value from 1 to 64000 milliseconds.

MIB Object ID: 1.3.6.1.4.1.18.3.5.1.7.5.1.24

4-22

Editing SDLC Parameters

Parameter: Slow Poll Count Limit

Default: 65535

Range: 1 to 65535

Function: Controls the number of times a link station is removed from the polling

list before sending an outage message to a device. This parameter operates with the Slow Poll Timer parameter.

Instructions: Enter a value from 1 to 65535, where 1 causes SDLC to generate an

outage after the ﬁrst Slow Poll Timer expires, and 65535 speciﬁes an inﬁnite number of retries.

MIB Object ID: 1.3.6.1.4.1.18.3.5.1.7.5.1.25

4-23

Configuring SDLC Services

Parameter: Pre-Activation Contact Frame

Default: XID

Options: XID | DISC | SNRM | SNRME | TEST

Function: Speciﬁes the frame to use for pre-activation polling. Pre-acti v ation sets up

the router connection table so that DLSw connects to the host before connecting to the SDLC station, or the reverse. The frames include

XID — Exchange Identiﬁcation DISC — Disconnect SNRM — Set Normal Response Mode SNRME — Set Normal Response Mode Extended TEST — Test

The XID default setting causes the router to establish a connection with the host before connecting to the SDLC link station. The line activates and the router sends the SNRM frame to the SDLC station. Selecting a value other than XID causes the router to send that value to the SDLC station before attempting to connect to the host.

Instructions: Click on Values and select one of the parameter settings.

Accept the XID default setting to establish a DLSw connection with the host. When the connection succeeds, the router sends an SNRM frame to the SDLC station.

To establish a connection to the SDLC station ﬁrst, select SNRM. When the router receives a response from the SDLC station, it then establishes a DLSw connection with the host. This minimizes the logging of unavailable or nonresponding SDLC stations.

MIB Object ID: 1.3.6.1.4.1.18.3.5.1.7.5.1.30

4-24

Editing SDLC Parameters

Parameter: Fast Contact Timer

Default: 4000 milliseconds

Range: 1 to 64000

Function: Controls the timeout required before retransmitting an unacknowledged

contact frame (SNRM or XID). For primary SDLC link stations only , this parameter operates with the Fast Contact Retry Limit parameter and is also used for special pre-activation polling.

Instructions: Enter a value from 1 to 64000 milliseconds. The value you enter must be

greater than the REPLYTO Timer value described earlier.

MIB Object ID: 1.3.6.1.4.1.18.3.5.1.7.5.1.16

Parameter: Fast Contact Retry Limit

Default: 4

Range: 1 to 64000

Function: Controls the number of times to transmit a contact frame (for example,

SNRM) before switching to the Slow Contact Timer. This parameter operates with the Fast Contact Timer parameter.

Instructions: Enter a value from 1 to 64000, where 1 causes the switch to the Slow

Contact Timer after the ﬁrst Fast Contact Timer expires. Enter 64000 for an inﬁnite number of retries.

MIB Object ID: 1.3.6.1.4.1.18.3.5.1.7.5.1.17

Parameter: Slow Contact Timer

Default: 4000 milliseconds

Range: 1 to 64000

Function: Allows contact polling to continue (using this timer) when the Fast

Contact Retry Limit expires. This prevents leased (multidrop) links from being overwhelmed by poll frames for absent stations. This parameter operates with the Slow Contact Retry Limit parameter.

Instructions: Enter a value from 1 to 64000 milliseconds.

MIB Object ID: 1.3.6.1.4.1.18.3.5.1.7.5.1.18

4-25

Configuring SDLC Services

Parameter: Slow Contact Retry Limit

Default: 8

Range: 1 to 65535

Function: Controls the number of times a contact frame (for example, SNRM) is

transmitted before sending an outage message to the SDLC device. This parameter operates with the Slow Contact Timer parameter.

Instructions: Enter a value from 1 to 65535, where 1 causes an outage after the ﬁrst

Slow Contact Timer expires, and 65535 speciﬁes an unlimited number of retries.

MIB Object ID: 1.3.6.1.4.1.18.3.5.1.7.5.1.19

Parameter: DISC Retransmit Timer

Default: 4000 milliseconds

Range: 1 to 64000

Function: Controls the length of time before retransmitting an unacknowledged

Disconnect (DISC) command. This parameter operates with the DISC Retransmit Retry Limit parameter for primary SDLC link stations only.

Instructions: Enter a value from 1 to 64000 milliseconds.

MIB Object ID: 1.3.6.1.4.1.18.3.5.1.7.5.1.20

Parameter: DISC Retransmit Retry Limit

Default: 4

Range: 1 to 65535

Function: Controls the number of times a Disconnect (DISC) command is

transmitted. This parameter operates with the DISC Retransmit Timer parameter.

Instructions: Enter a value from 1 to 65535, where 1 causes an outage after the ﬁrst

DISC Retransmit Timer e xpires, and 65535 speciﬁes an unlimited number of retries.

MIB Object ID: 1.3.6.1.4.1.18.3.5.1.7.5.1.21

4-26

Parameter: Poll Bit Set In I-Frame

Default: TRUE

Options: TRUE | FALSE

Function: Speciﬁes whether this link station sends the poll bit on an Information

frame. Certain SDLC implementations do not handle receipt of I-frames carrying the poll bit.

Instructions: Enter TRUE if this link station can send the poll bit on an Information

frame.

MIB Object ID: 1.3.6.1.4.1.18.3.5.1.7.5.1.31

Deleting SDLC from the Router

T o delete all SDLC interfaces from the router, begin at the Conﬁguration Manager window (refer to Figure 4-1) and complete the following steps:

1. Select Protocols➔SDLC➔Delete SDLC.

2. Click on OK in the conﬁrmation window.

Site Manager deletes the SDLC interfaces on the router.

Editing SDLC Parameters

4-27

Appendix A

SDLC Default Parameter Settings

Tables A-1 through A-3 list the default settings for SDLC parameters. Use the Conﬁguration Manager to edit any of the Site Manager default settings listed here. Note that some SDLC parameters assume different defaults in Site Manager, depending on whether you are conﬁguring APPN or DLSw.

Table A-1. SDLC Line Parameters

Default Setting

Parameter

Clock Source Internal Internal Internal Clock Speed 19.2 KB 19.2 KB Sync Line Coding NRZ NRZ Cable Type RS232 RS232 RTS Enable Disable Disable

with APPN

Default Setting with DLSw

A-1

Configuring SDLC Services

Table A-2. SDLC Interface Parameters

Default Setting

Parameter

Enable Enable Enable Port Name APPN port name Circuit name Link Station Role Negotiable Primary Link Station Address 4 None Support Negotiable Connection False False Max Frame Retransmit Count 5 5 Non-productive Timer 2000 ms 2000 ms Non-productive Retry Limit 15 15 Idle Line Timer 6000 ms 6000 ms Idle Line Retry Limit 20 20 Port Write Timer 3000 ms 3000 ms Port Write Retry Limit 10 10 Link Connection Timer 3000 ms 3000 ms Link Connection Retry Limit 10 10

with APPN

Default Setting with DLSw

A-2

Primary Full Duplex False False Secondary Full Duplex False False Enable Reject Frame True True Max XID Size 256 256 Max Frame Size PDU2057 PDU2057 Total Link Station Limit 16 16 Inbound Link Station Limit 8 8 Outbound Link Station Limit 8 8

(continued)

SDLC Default Parameter Settings

Table A-2. SDLC Interface Parameters

Default Setting

Parameter

Receive Buffer Pool Size 7 7 Initial Flow Control Credit 7 7 Enable Stats Collection True True

with APPN

(continued)

Default Setting with DLSw

Table A-3. SDLC Link Station Parameters

Default Setting

Parameter

Enable Enable Enable PU Name Conﬁgured APPN

Group Address 0 None

with APPN

Link Station Name or NAME portion of the APPN NETID.NAME

Default Setting with DLSw

Conﬁgured DLSw Adjacent Link Station Name

MAXDATA PDU2057 PDU2057 MAXOUT 7 7 MAXIN 7 7 Response Timer 400 ms None RNR Timer 3 min 3 min RNR Retry Limit 4 4 REPLYTO Timer 30 tenths of a

second

REPLYTO Retry Limit 10 10 Fast Poll Timer 400 ms 400 ms Fast Poll Count Limit 16 16

30 tenths of a second

(continued)

A-3

Configuring SDLC Services

Table A-3. SDLC Link Station Parameters

Default Setting

Parameter

Slow Poll Timer 1000 ms 1000 ms Slow Poll Count Limit 65535 65535 Pre-Activation Contact Frame XID XID Fast Contact Timer 4000 ms 4000 ms Fast Contact Retry Limit 4 4 Slow Contact Timer 4000 ms 4000 ms Slow Contact Retry Limit 8 8 DISC Retransmit Timer 4000 ms 4000 ms DISC Retransmit Retry Limit 4 4 Poll Bit Set In I-Frame True True

with APPN

(continued)

Default Setting with DLSw

A-4

Index

adding SDLC link stations, 4-15 address ﬁeld in SDLC frames, 1-3 APPN

link station types allowed, 2-1 using with SDLC, 1-4

Bay Networks

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

BOFL parameter, 2-2

Cable Type parameter, 3-5 Clock Source parameter, 3-3 CompuServe, Bay Networks forum on, xii conﬁguring

SDLC link stations, 4-15

connections

physical, 1-3 control ﬁeld in SDLC frames, 1-3 customer support. See getting help

defaults

SDLC parameters, A-1 to A-4

deleting

SDLC from the node, 4-27

SDLC interfaces, 4-14 DISC Retransmit Retry Limit parameter, 4-26 DISC Retransmit Timer parameter, 4-26 DLSw

link station types allowed, 2-1

using with SDLC, 1-4

editing

SDLC global parameters, 4-3 to 4-4

SDLC interface parameters, 4-4 to 4-14

SDLC link station parameters, 4-17 to 4-27 Enable parameter, 4-4, 4-6, 4-18 Enable Reject Frame parameter, 4-11 Enable Stats Collection parameter, 4-14 enabling SDLC, 3-1 to 3-5 exchange identiﬁcation (XID), 1-2, 4-7

Fast Contact Retry Limit parameter, 4-25 Fast Contact Timer parameter, 4-25 Fast Poll Count Limit parameter, 4-22 Fast Poll Timer parameter, 4-22

Index-1

ﬂag ﬁeld in SDLC frames, 1-3 formats

SDLC frames, 1-3 frame formats, 1-3 frame-checking ﬁeld in SDLC frames, 1-3 full-duplex transmission, 1-2

conﬁguring, 4-11

getting help

from a Bay Networks Technical Response

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

Group Address parameter, 4-18

link stations

adding, 4-15 conﬁguration considerations, 2-1 editing, 4-17 to 4-27 types, 1-2

Max Frame Retransmit Count parameter, 4-8 Max Frame Size parameter, 4-12 Max XID Size parameter, 4-12 MAXDATA parameter, 4-19 MAXIN parameter, 4-19 MAXOUT parameter, 2-2, 4-19 multipoint topology, 1-1

half-duplex transmission, 1-2

conﬁguring, 4-11

Idle Line Retry Limit parameter, 4-9 Idle Line Timer parameter, 4-9 Inbound Link Station Limit parameter, 4-13 InfoFACTS service, xiii information ﬁeld in SDLC frames, 1-3 information frames, 1-3 Initial Flow Control Credit parameter, 4-14 Internal Clock Speed parameter, 3-4

Link Connection Retry Limit parameter, 4-10 Link Connection Timer parameter, 4-10 Link Station Address parameter, 4-7, 4-17 Link Station Role parameter, 4-7

negotiable link stations, 1-2

conﬁguring, 2-1, 4-7 Non-productive Retry Limit parameter, 4-8 Non-productive Timer parameter, 4-8

Outbound Link Station Limit parameter, 4-13

parameters

default settings, A-1 to A-4

SDLC global, 4-3

SDLC interface, 4-4 to 4-14

SDLC line, 3-3 to 3-5

SDLC link station, 4-17 to 4-27 physical connections, 1-3 point-to-point topology, 1-1 Poll Bit Set In I-Frame parameter, 4-27 Port Name parameter, 4-6 Port Write Retry Limit parameter, 4-10

Index-2

Port Write Timer parameter, 4-9 Pre-Activation Contact Frame parameter, 4-24 Primary Full Duplex parameter, 4-11 primary link stations, 1-2

conﬁguring, 2-1, 4-7

PU Name parameter, 4-18

Receive Buffer Pool Size parameter, 4-13 REPLYTO Retry Limit parameter, 4-21 REPLYTO Timer parameter, 2-2, 4-21 Response Timer parameter, 4-20 RNR Retry Limit parameter, 4-20 RNR Timer parameter, 4-20 RTS Enable parameter, 2-2, 3-5

size

window, 2-2

conﬁguring, 4-19 Slow Contact Retry Limit parameter, 4-26 Slow Contact Timer parameter, 4-25 Slow Poll Count Limit parameter, 4-23 Slow Poll Timer parameter, 4-22 supervisory frames, 1-3 Support Negotiable Connection parameter, 4-7 Sync Line Coding parameter, 3-4 synchronous line parameters, 3-3 to 3-5

timers, SDLC, 2-2 topologies, 1-1 Total Link Station Limit parameter, 4-12 transmission capabilities, 1-2

SDLC

deleting from router, 4-27 enabling, 3-1 to 3-5, 4-4 interfaces

deleting, 4-14 editing parameters, 4-4

link stations

adding, 4-15 deﬁned, 1-2

editing, 4-17 overview, 1-1 to 1-4 parameters

defaults, A-1 to A-4

editing, 4-1 to 4-27 publications about, 1-4 timers, 2-2

Secondary Full Duplex parameter, 4-11 secondary link stations, 1-2

conﬁguring, 2-1, 4-7

unnumbered frames, 1-3

window size, 2-2

conﬁguring, 4-19

World Wide Web, Bay Networks Home Page on,

xiii

XID (exchange identiﬁcation), 1-2, 4-7

Index-3

Avaya SDLC User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

SDLC Networking

SDLC Features

Link Station Roles

Transmission Capabilities

Physical Connections

Frame Format

Using APPN Services with SDLC

Using DLSw Services with SDLC

For More Information about SDLC

Link Stations

Synchronous Line Parameters

SDLC Timers

Enabling SDLC on an Interface

SDLC Line Parameter Descriptions

Using the Parameter Descriptions

Accessing SDLC Parameters

Editing SDLC Global Parameters

Editing SDLC Interface Parameters

SDLC Interface Parameter Descriptions

Deleting an SDLC Interface

Adding an SDLC Link Station

Editing SDLC Link Station Parameters

SDLC Link Station Parameter Descriptions

Deleting SDLC from the Router

Index