OSPF Version 2

This RFC was published in 1998.

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.

RFC 2328 introduction

This document is a specification of the Open Shortest Path First (OSPF) TCP/IP internet routing protocol.
OSPF is classified as an Interior Gateway Protocol (IGP).
This means that it distributes routing information between routers belonging to a single Autonomous System.
The OSPF protocol is based on link-state or SPF technology.
This is a departure from the Bellman-Ford base used by traditional TCP/IP internet routing protocols.

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