Avaya Configuring LLC Services User manual

BayRS Version 15.1

Part No. 308635-15.1 Rev 00

October 2001

600 Technology Park Drive

Billerica, MA 01821-4130

Configuring LLC Services

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308635-15.1 Rev 00

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308635-15.1 Rev 00

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Contents

Preface

Before You Begin .............................................................................................................xiii

Text Conventions .............................................................................................................xiv

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

Hard-Copy Technical Manuals ........................................................................................xvii

How to Get Help .............................................................................................................xvii

Chapter 1

Logical Link Control Overview

Using LLC2 with SNA and NetBIOS ...............................................................................1-2

Supported Connections ..................................................................................................1-2

Frame Relay Support .....................................................................................................1-3

Boundary Network Node ..........................................................................................1-5

PVC Support .....................................................................................................1-5

SVC Support .....................................................................................................1-5

Boundary Access Node ...........................................................................................1-6

LLC 8802/802.2 Standards .............................................................................................1-6

LLC Service Classes ......................................................................................................1-7

LLC1 (Connectionless Service) ...............................................................................1-8

LLC2 (Connection-Oriented Service) .......................................................................1-8

LLC Operation Types ......................................................................................................1-9

Type 1 Operations ....................................................................................................1-9

Type 2 Operations ....................................................................................................1-9

LLC Functionality ..........................................................................................................1-10

LLC Protocol Data Unit Formats ...................................................................................1-11

Destination SAP (DSAP) ........................................................................................1-11

Source SAP (SSAP) ...............................................................................................1-12

SAP Addressing Scheme .......................................................................................1-12

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Control Field ...........................................................................................................1-14

Control Field Formats .............................................................................................1-16

Information Field ....................................................................................................1-20

Chapter 2

LLC2 Routed over Frame Relay

Compatibility with RFC 1490 ..........................................................................................2-1

Compatibility with IBM NCP 7.1 and Later .....................................................................2-2

FRAD-like Functionality ..................................................................................................2-4

Mapping DLCIs to MAC Addresses ................................................................................2-4

Router Mapping Examples .............................................................................................2-5

Virtual MAC Address to Frame Relay DLCI .............................................................2-6

Frame Relay DLCI to Virtual MAC Address .............................................................2-7

Physical MAC Address to Frame Relay DLCI ..........................................................2-8

Frame Relay DLCI to Physical MAC Address ..........................................................2-9

Frame Relay DLCI to Frame Relay DLCI ...............................................................2-10

LLC2 over Frame Relay: Routed versus Bridged .........................................................2-12

Chapter 3

Starting LLC Services

Starting Configuration Tools ...........................................................................................3-2

LLC2 Configuration Hierarchy ........................................................................................3-2

Starting LLC2 on a LAN Interface ...................................................................................3-4

Configuring LLC2 on an Ethernet Interface .......................................................3-4

Configuring LLC2 on a Token Ring Interface .....................................................3-5

Configuring LLC2 on an FDDI Interface ............................................................3-6

Starting LLC2 over ATM LANE .......................................................................................3-8

Starting DLSw and LLC2 over Frame Relay .................................................................3-10

Starting DLSw and LLC2 over Frame Relay BAN ..................................................3-10

Starting DLSw and LLC2 over Frame Relay BNN ..................................................3-13

Starting DLSw and LLC2 on a Frame Relay BNN PVC Interface ....................3-13

Starting DLSw and LLC2 on a Frame Relay BNN SVC Interface ....................3-17

Starting APPN and LLC2 over Frame Relay .................................................................3-21

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Chapter 4

Customizing LLC Services

Disabling and Reenabling LLC2 on the Router ..............................................................4-1

Customizing an LLC2 Interface ......................................................................................4-2

Disabling and Reenabling an LLC2 Interface ...........................................................4-3

Configuring the Window Size ...................................................................................4-4

Specifying the Maximum Number of Received Information PDUs ....................4-4

Specifying the Maximum Number of Outstanding Information PDUs ................4-5

Specifying the Unnumbered Information and Information PDU Sizes .....................4-6

Configuring Timers ...................................................................................................4-7

Specifying the Maximum Number of PDU Retries After Timeout .............................4-9

Setting the Maximum Number of LLC2 Interface Connections ..............................4-10

Fine-Tuning LLC2 Interface Parameters .................................................................4-12

Customizing LLC2 over Frame Relay ...........................................................................4-13

Configuring the Frame Relay Virtual MAC Address Mask .....................................4-13

Enabling Frame Relay MAC Address Translation to a Virtual SAP ........................4-14

Editing Frame Relay PVC Mappings ......................................................................4-16

Editing Frame Relay SVC Mappings ......................................................................4-17

Configuring the LLC Virtual Ring Number for APPN with SRB ....................................4-20

Configuring LLC2 Inbound Traffic Filters ......................................................................4-21

Deleting LLC2 from an Interface ...................................................................................4-21

Deleting LLC2 from the Router .....................................................................................4-22

Appendix A

Site Manager Parameters

Accessing LLC Parameters ........................................................................................... A-2

Add LLC2 Frame Relay SVC Mapping Parameters ....................................................... A-2

LLC2 Frame Relay SVC Mapping Parameters .............................................................. A-5

Add LLC2 Frame Relay PVC Mapping Parameters ....................................................... A-6

LLC2 Frame Relay PVC Mapping Parameters .............................................................. A-8

LLC2 Global Parameters ............................................................................................... A-9

LLC2 Interface Parameters .......................................................................................... A-10

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Appendix B

Monitoring LLC Using the BCC show Commands

Online Help for show Commands .................................................................................. B-2

show llc2 all ................................................................................................................... B-3

show llc2 dlci .................................................................................................................B-5

show llc2 fr-svc .............................................................................................................. B-6

show llc2 interfaces ....................................................................................................... B-7

show llc2 links ................................................................................................................B-8

show llc2 summary ........................................................................................................ B-8

Index

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Figures

Figure 1-1. Sample Frame Relay Network .................................................................1-4

Figure 1-2. LLC Sublayer in the IEEE 802.x and OSI Models ....................................1-7

Figure 1-3. LLC PDU Structure ................................................................................1-11

Figure 1-4. DSAP Address Field ..............................................................................1-11

Figure 1-5. SSAP Address Field ..............................................................................1-12

Figure 1-6. SAPs for LLC Clients .............................................................................1-13

Figure 1-7. LLC PDU Control Field Format ..............................................................1-15

Figure 2-1. Sample Frame Relay Network Using LLC2 .............................................2-3

Figure 2-2. Virtual MAC to Frame Relay Topology .....................................................2-6

Figure 2-3. Frame Relay to Virtual MAC Topology .....................................................2-7

Figure 2-4. Physical MAC to Frame Relay Topology ..................................................2-8

Figure 2-5. Frame Relay to Physical MAC Topology ................................................2-10

Figure 2-6. Frame Relay to Frame Relay Topology ..................................................2-11

Figure 2-7. RFC 1490 Bridging and Routing Standards for SNA .............................2-12

Figure 3-1. LLC2 Configuration Hierarchy...................................................................3-2

Figure A-1. LLC2 Frame Relay SVC Mapping Add Window ...................................... A-3

Figure A-2. LLC2 Frame Relay SVC Mappings Window ........................................... A-6

Figure A-3. LLC2 Frame Relay PVC Mapping Add Window ...................................... A-7

Figure A-4. LLC2 Frame Relay PVC Mappings Window ........................................... A-9

Figure A-5. Edit LLC2 Global Parameters Window .................................................... A-9

Figure A-6. LLC2 Interface Configuration Window .................................................. A-11

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Tables

Table 1-1. LLC Command PDUs ............................................................................1-10

Table 1-2. PDU Format and Function .....................................................................1-16

Table 1-3. Control Field Bits and Functions ............................................................1-16

Table 1-4. Command and Response PDU Names and Definitions ........................1-17

Table 4-1. BCC Fine-Tuning Parameters for LLC2 Interfaces .................................4-12

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Preface

This guide describes Logical Link Control (LLC) services and what you do to

start and customize LLC services on a Nortel Networks

*

router. By customizing

your router for LLC services, you open your network to LAN Network Manager

(LNM) servers, data link switching (DLSw) services, and Advanced Peer-to-Peer

Networking (APPN).

You can use the Bay Command Console (BCC) or Site Manager to configure LLC

on a router. In this guide, you will find instructions for using both the BCC and

Site Manager.

Before You Begin

Before using this guide, you must complete the following procedures. For a new

router:

• Install the router (see the installation guide that came with your router).

• Connect the router to the network and create a pilot configuration file (see

Quick-Starting Routers, Configuring Remote Access for AN and Passport

ARN Routers, or Connecting ASN Routers to a Network).

Make sure that you are running the latest version of Nortel Networks BayRS and

Site Manager software. For information about upgrading BayRS and Site

Manager, see the upgrading guide for your version of BayRS.

Configuring LLC Services

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Text Conventions

This guide uses the following text conventions:

angle brackets (< >) Indicate that you choose the text to enter based on the

description inside the brackets. Do not type the

brackets when entering the command.

Example: If the command syntax is:

ping

<

ip_address

>

, you enter:

ping

192.32.10.12

bold text

Indicates command names and options and text that

you need to enter.

Example: Enter

show ip

{

alerts

|

routes

}.

Example: Use the

dinfo

command.

braces ({}) Indicate required elements in syntax descriptions

where there is more than one option. You must choose

only one of the options. Do not type the braces when

entering the command.

Example: If the command syntax is:

show ip

{

alerts

|

routes

}

, you must enter either:

show ip alerts

or

show ip routes

, but not both.

italic text Indicates new terms, book titles, and variables in

command syntax descriptions. Where a variable is two

or more words, the words are connected by an

underscore.

Example: If the command syntax is:

show at

<

valid_route

>

valid_route

is one variable and you substitute one value

for it.

screen text Indicates system output, for example, prompts and

system messages.

Example:

Set Trap Monitor Filters

Preface

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xv

Acronyms

This guide uses the following acronyms:

separator ( > ) Shows menu paths.

Example: Protocols > IP identifies the IP option on the

Protocols menu.

vertical line (

|

) Separates choices for command keywords and

arguments. Enter only one of the choices. Do not type

the vertical line when entering the command.

Example: If the command syntax is:

show ip

{

alerts

|

routes

}

, you enter either:

show ip alerts

or

show ip routes

, but not both.

ANSI American National Standards Institute

APPN Advanced Peer-to-Peer Networking

ATM asynchronous transfer mode

BAN Boundary Access Node

BNI Boundary Node Identifier

BNN Boundary Network Node

DLCI data link connection identifier

DLSw data link switching

DM disconnected mode

DNA data network address

DSAP destination service access point

DSPU downstream physical unit

FDDI Fiber Distributed Data Interface

FEP front-end processor

FR frame relay

FRAD Frame Relay Access Device

FRMR frame reject

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IEEE Institute of Electrical and Electronic Engineers

IP Internet Protocol

ISO International Organization for Standardization

ITU-T International Telecommunication Union-

Telecommunication Standardization sector [formerly

CCITT]

LAN local area network

LANE LAN emulation

LEC LAN emulation client

LLC Logical Link Control

LNM LAN Network Manager

LSAP link service access point

LSDU link service data unit

MAC media access control

MSB most significant byte

NCP Network Communications Program

NetBIOS Network Basic Input/Output System

OSI Open Systems Interconnection

PDU protocol data unit

PPP Point-to-Point Protocol

PVC permanent virtual circuit

RFC Request for Comments

RNR receiver not ready

RR receiver ready

SABME set asynchronous balanced mode extended

SAP service access point

SDLC Synchronous Data Link Control

SNA Systems Network Architecture

SR source routing

SRB source route bridging

Preface

308635-15.1 Rev 00

xvii

Hard-Copy Technical Manuals

You can print selected technical manuals and release notes free, directly from the

Internet. Go to the www.nortelnetworks.com/documentation URL. Find the

product for which you need documentation. Then locate the specific category and

model or version for your hardware or software product. Use Adobe* Acrobat

Reader* to open the manuals and release notes, search for the sections you need,

and print them on most standard printers. Go to Adobe Systems at the

www.adobe.com URL to download a free copy of the Adobe Acrobat Reader.

You can purchase selected documentation sets, CDs, and technical publications

through the Internet at the www1.fatbrain.com/documentation/nortel/ URL.

How to Get Help

If you purchased a service contract for your Nortel Networks product from a

distributor or authorized reseller, contact the technical support staff for that

distributor or reseller for assistance.

If you purchased a Nortel Networks service program, contact one of the following

Nortel Networks Technical Solutions Centers:

SSAP source service access point

SVC switched virtual circuit

UA unnumbered acknowledgment

UI unnumbered information

WAN wide area network

XID exchange identification

Technical Solutions Center Telephone

Europe, Middle East, and Africa (33) (4) 92-966-968

North America (800) 4NORTEL or (800) 466-7835

Asia Pacific (61) (2) 9927-8800

China (800) 810-5000

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Additional information about the Nortel Networks Technical Solutions Centers is

available from the www.nortelnetworks.com/help/contact/global URL.

An Express Routing Code (ERC) is available for many Nortel Networks products

and services. When you use an ERC, your call is routed to a technical support

person who specializes in supporting that product or service.

To locate an ERC for

your product or service, go to the

http://www130.nortelnetworks.com/cgi-bin/

eserv/common/essContactUs.jsp

URL.

308635-15.1 Rev 00

1-1

Chapter 1

Logical Link Control Overview

LLC is a standard protocol within the ITU-T (formerly CCITT) 8802.2 and IEEE

802.x family of LAN standards. Connection-oriented protocols, including IBM

*

Systems Network Architecture (SNA) and NetBIOS, use LLC services.

Connection-oriented protocols do not have a network layer address (such as an IP

subnet) to route information. Instead, before any information transfer occurs, a

device on the network sends a “broadcast” or “explorer” frame to locate the

session partner. From this broadcast, the network establishes a path for the data

transfer.

LLC2 traffic is generally sensitive to excessive network delays, causing problems

with SNA and NetBIOS sessions. Data link switching (DLSw) and Advanced

Peer-to-Peer Networking

*

(APPN

*

) resolve these problems by locally terminating

the LLC2 session at the router and by providing a local acknowledgment to

SNA/NetBIOS workstations. The LLC2 subsystem provides these services.

The Nortel Networks implementation of the LLC protocol consists of LLC

Class 1 (LLC1), a connectionless service, and LLC Class 2 (LLC2), a

connection-oriented service. The subsystems that require LLC2 services are as

follows:

• DLSw

• APPN

• LAN Network Manager (LNM)

Most other protocols use LLC1, or connectionless, delivery services.

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308635-15.1 Rev 00

In general, there is no need to change the LLC2 default settings. You can,

however, tune the network by changing these default settings. In Site Manager,

you should not add LLC2 to an interface without also adding the DLSw, APPN, or

LNM protocol.

Using LLC2 with SNA and NetBIOS

SNA requires a connection-oriented data link layer for end-to-end packet

sequencing and error control. Over wide area networks (WANs), the Synchronous

Data Link Control (SDLC) protocol has traditionally met this need. However, in a

LAN environment, front-end processors (FEPs), controllers, and NetBIOS

client/server stations commonly use an LLC2 layer for this purpose. To support

communication among these devices, you can add LLC2 interfaces to a router

configuration.

SNA devices and NetBIOS PCs use LLC when they establish sessions through a

LAN topology. SNA and NetBIOS need LLC2 connection-oriented circuits to

provide higher-layer sequencing and error control in bridged LAN environments.

LLC2 works much like SDLC for packet sequencing and acknowledgment.

Unlike SDLC, it does not impose unbalanced, primary/secondary relationships

between communicating nodes. Any LLC station can initiate a peer-to-peer

conversation with any other LLC station.

Supported Connections

You configure LLC2 on any interface requiring local termination, including:

• APPN interfaces

• DLSw interfaces

-- When you connect over an IP backbone in dual-switch DLSw

configurations, the interface attached to the IP backbone does not use

LLC2.

-- When you connect over an LLC2 backbone in DLSw single-switch

configurations, the interface attached to the backbone uses LLC2.

• Token ring interfaces running LNM

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