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Configuring OSPF This chapter describes how to configure OSPF For a complete description of the OSPF commands in this chapter refer to the OSPF Commands chapter of the Network Protocols Command Reference Part 1 To locate documentation of other commands that appear in this chapter use the command reference master index or search online Open shortest path first OSPF is an IGP developed by the OSPF working group of the Internet Engineering Task Force IETF Designed expressly for IP networks OSPF supports IP subnetting and tagging of externally derived routing information OSPF also allows packet authentication and uses IP multicast when sending receiving packets We support RFC 1253 Open Shortest Path First OSPF MIB August 1991 The OSPF MIB defines an IP routing protocol that provides management information related to OSPF and is supported by Cisco routers For protocol independent features that include OSPF see the chapter Configuring IP Routing Protocol Independent Features in this document Cisco s OSPF Implementation Cisco s implementation conforms to the OSPF Version 2 specifications detailed in the Internet RFC 1583 The list that follows outlines key features supported in Cisco s OSPF implementation Stub areas Definition of stub areas is supported Authentication Plain text and MD5 authentication among neighboring routers within an area is supported Routing interface parameters Configurable parameters supported include interface output cost retransmission interval interface transmit delay router priority router dead and hello intervals and authentication key Virtual links Virtual links are supported Route redistribution Routes learned via any IP routing protocol can be redistributed into any other IP routing protocol At the intradomain level this means that OSPF can import routes learned via IGRP RIP and IS IS OSPF routes can also be exported into IGRP RIP and IS IS At the interdomain level OSPF can import routes learned via EGP and BGP OSPF routes can be exported into

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