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OSPF Version 2 (RFC1583)

IP.com Disclosure Number: IPCOM000002417D
Original Publication Date: 1994-Mar-01
Included in the Prior Art Database: 2019-Feb-13

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

J. Moy: AUTHOR

Related Documents

10.17487/RFC1583: DOI

Abstract

This memo documents version 2 of the OSPF protocol. OSPF is a link- state routing protocol. [STANDARDS-TRACK]

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 1% of the total text.

Network Working Group J. Moy Request for Comments: 1583 Proteon, Inc. Obsoletes: 1247 March 1994 Category: Standards Track

OSPF Version 2

Status of this Memo

This document specifies an Internet standards track protocol for the Internet community, and requests discussion and suggestions for improvements. Please refer to the current edition of the "Internet Official Protocol Standards" (STD 1) 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 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.

OSPF Version 2 was originally documented in RFC 1247. The differences between RFC 1247 and this memo are explained in Appendix E. The differences consist of bug fixes and clarifications, and are backward-compatible in nature. Implementations of RFC 1247 and of this memo will interoperate.

Please send comments to ospf@gated.cornell.edu.

Moy [Page 1]

RFC 1583 OSPF Version 2 March 1994

Table of Contents

1 Introduction ........................................... 5 1.1 Protocol Overview ...................................... 5 1.2 Definitions of commonly used terms ..................... 6 1.3 Brief history of link-state routing technology ......... 9 1.4 Organization of this document .......................... 9 2 The Topological Database .............................. 10 2.1 The shortest-path tree ................................ 13 2.2 Use of external routing information ................... 16 2.3 Equal-cost multipath .................................. 20 2.4 TOS-based routing ..................................... 20 3 Splitting the AS into Areas ........................... 21 3.1 The backbone of the Autonomous System ................. 22 3.2 Inter-area routing .................................... 22 3.3 Classification of routers ............................. 23 3.4 A sample area configuration ........................... 24 3.5 IP subnetting support ................................. 30 3.6 Supporting stub areas ................................. 31 3.7 Partitions of areas ................................... 32 4 Functional Summary .................................... 34 4.1 Inter-area routing .................................... 35 4.2 AS external routes .................................... 35 4....

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