OSI IS-IS Intra-domain Routing Protocol
RFC 1142
Document | Type |
RFC - Historic
(February 1990; No errata)
Obsoleted by RFC 7142
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Last updated | 2014-02-27 | ||
Stream | Legacy | ||
Formats | plain text pdf ps html bibtex | ||
Stream | Legacy state | (None) | |
Consensus Boilerplate | Unknown | ||
RFC Editor Note | (None) | ||
IESG | IESG state | RFC 1142 (Historic) | |
Telechat date | |||
Responsible AD | (None) | ||
Send notices to | (None) |
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 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 Telecommunications and information exchange between systems Intermediate 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) 1 Scope and Field of Application This International Standard specifies a protocol which is used by Network Layer entities operating ISO 8473 in In termediate Systems to maintain routeing information for the purpose of routeing within a single routeing domain. The protocol herein described relies upon the provision of a connectionless-mode underlying service.11See ISO 8473 and its Addendum 3 for the mechanisms necessary to realise this service on subnetworks based on ISO 8208, ISO 8802, and the OSI Data Link Service. This Standard specifies: a)procedures for the transmission of configuration and routeing information between network entities resid ing in Intermediate Systems within a single routeing domain; b)the encoding of the protocol data units used for the transmission of the configuration and routeing inforShow full document text