OSPF Version 2

This RFC was published in 1991.

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.

RFC 1247 introduction

This document is a specification of the Open Shortest Path First (OSPF) internet routing protocol.
OSPF is classified as an Internal Gateway Protocol (IGP).
This means that it distributes routing information between routers belonging to a single Autonomous System.
The OSPF protocol is based on SPF or link-state technology.
This is a departure

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