RFC - 1247

OSPF Version 2

Original:	ftp://ftp.isi.edu/in-notes/rfc1247.txt
Authors:	J. Moy [Proteon, Inc.]
Date:	July 1991
Category:	Informational
This specification has been !!! obsoleted !!!

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Obsoleted by:
RFC-1583	OSPF Version 2 (Obsoleted by RFC-2178 -> RFC-2328std54)

Obsoletes:
RFC-1131	OSPF specification (Obsoleted by RFC-1247 -> RFC-1583 -> RFC-2178 -> RFC-2328std54)

Updated by:
RFC-1349	Type of Service in the Internet Protocol Suite (Obsoleted by RFC-2474prop)

Referred by:	32 RFC
Refers to:	5 RFC

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Status

This RFC specifies an IAB standards track protocol for the Internet community, and requests discussion and suggestions for improvements. Please refer to the current edition of the ``IAB Official Protocol Standards'' for the standardization state and status of this protocol. Distribution of this memo is unlimited.

Abstract

This memo documents version 2 of the OSPF protocol. OSPF is a link- state based routing protocol. It is designed to be run internal to a single Autonomous System. Each OSPF router maintains an identical database describing the Autonomous System's topology. From this database, a routing table is calculated by constructing a shortest-path tree.

OSPF recalculates routes quickly in the face of topological changes, utilizing a minimum of routing protocol traffic. OSPF provides support for equal-cost multipath. Separate routes can be calculated for each IP type of service. An area routing capability is provided, enabling an additional level of routing protection and a reduction in routing protocol traffic. In addition, all OSPF routing protocol exchanges are authenticated.

Version 1 of the OSPF protocol was documented in RFC 1131(-> 1247(-> 1583(-> 2178(-> 2328^std54)))). The differences between the two versions are explained in Appendix F.

Please send comments to ospf@trantor.umd.edu.

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