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OSI IS-IS Intra-domain Routing Protocol (RFC1142)

IP.com Disclosure Number: IPCOM000001953D
Original Publication Date: 1990-Feb-01
Included in the Prior Art Database: 2001-Oct-24

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

D. Oran: AUTHOR

Abstract

This Protocol is one of a set of International Standards produced to facilitate the interconnection of open systems. The set of standards covers the services and protocols re quired to achieve such interconnection. This Protocol is positioned with respect to other related standards by the layers defined in the ISO 7498 and by the structure defined in the ISO 8648. In particular, it is a protocol of the Network Layer. This protocol permits Intermediate Systems within a routeing Domain to exchange configuration and routeing information to facilitate the operation of the route ing and relaying functions of the Network Layer. The protocol is designed to operate in close conjunction with ISO 9542 and ISO 8473. ISO 9542 is used to establish connectivity and reachability between End Systems and Inter mediate Systems on individual Subnetworks. Data is carried by ISO 8473. The related algo rithms for route calculation and maintenance are also described. The intra-domain ISIS routeing protocol is intended to support large routeing domains consisting of combinations of many types of subnetworks. This includes point-to-point links, multipoint links, X.25 subnetworks, and broadcast subnetworks such as ISO 8802 LANs. In order to support large routeing domains, provision is made for Intra-domain routeing to be organised hierarchically. A large domain may be administratively divided into areas. Each system resides in exactly one area. Routeing within an area is referred to as Level 1 routeing. Routeing between areas is referred to as Level 2 routeing. Level 2 Intermediate systems keep track of the paths to destination areas. Level 1 Intermediate systems keep track of the routeing within their own area. For an NPDU destined to another area, a Level 1 Intermediate system sends the NPDU to the nearest level 2 IS in its own area, re gardless of what the destination area is. Then the NPDU travels via level 2 routeing to the destination area, where it again travels via level 1 routeing to the destination End System. Information technology (Download file contains alternative document formats.)

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Network Working Group                                     D. Oran, Editor

Request for Comments: 1142                        Digital Equipment Corp.

                                                            February 1990

                      OSI IS-IS Intra-domain Routing Protocol

Status of this Memo

   This RFC is a republication of ISO DP 10589 as a service to the

   Internet community.  This is not an Internet standard.

   Distribution of this memo is unlimited.

NOTE:  This is a bad ASCII version of this document.  The official

document is the PostScript file, which has the diagrams in place.

Please use the PostScript version of this memo.

ISO/IEC DIS 10589

Information technology Telecommunications and information exchange

between systems Interme diate system to Intermediate system

Intra-Domain routeing exchange protocol for use in Conjunction with

the Protocol for providing the Connectionless- mode Network Service

(ISO 8473) Technologies de l'information Communication de donnies et

ichange d'information entre systhmes Protocole intra-domain de routage

d'un systhme intermediare ` un systhme intermediare ` utiliser

conjointement avec le protocole fournissant le service de riseau en

mode sans connexion (ISO 8473) UDC 00000.000 : 000.0000000000

Descriptors:

Contents

              Introduction                            iv

              1               Scope and Field of Application              1

              2               References          1

              3               Definitions         2

              4               Symbols and Abbreviations             3

              5               Typographical Conventions              4

              6               Overview of the Protocol              4

              7               Subnetwork Independent Functions              9

              8               Subnetwork Dependent Functions              35

              9               Structure and Encoding of PDUs          47

              10               System Environment              65

              11               System Management               67

              12               Conformance         95

              Annex A             PICS Proforma              99

              Annex B               Supporting Technical Material              105

              Annex C               Implementation Guidelines and Examples              109

              Annex D               Congestion Control and Avoidance              115

Introduction

This Protocol is one of a set of International Standards produced to

facilitate the interconnection of open systems. The set of standards

covers the services and protocols re quired to achieve such

interconnection.  This Protocol is positioned with respect to other

related standards by the layers defined in the ISO 7498 and by the

structure defined in the ISO 8648. In particular, it is a protocol of

the Network Layer. This protocol permits Intermediate Systems within a

routeing Domain to exchange configuration and routeing information to

facilitate the operation of the route ing and relaying functions of

the Network Layer.  The protocol is designed to operate in close

conjunction with ISO 9542 and ISO 8473.  ISO 9542 is used to establish

connectivity and reachability between End Systems and Inter mediate

Systems on individual Subnetworks. Data is carried by ISO 8473.  The

related algo rithms for route calculation and maintenance are also

described.  The intra-domain ISIS routeing protocol is intended to

support large routeing domains consisting of combinations of many

types of subnetworks. This includes point-to-point links, multipoint

links, X.25 subnetworks, and broadcast subnetworks such as ISO 8802

LANs.  In order to support large routeing domains, provision is made

for Intra-domain routeing to be organised hierarchic...