RFC 1793 - Extending OSPF to Support Demand Circuits - Defines an extension to make the protocol suitable for networks where cost varies with usage. RFC 1583 - OSPF Version 2 - An older version of the standard. RFC 1584 - Multicast Extensions to OSPF - Standard document. RFC 1247 - OSPF Version 2 - An older version of the standard. RFC 1245 - OSPF protocol analysis - Describes the uses and requirements of the protocol, suitable applications, and limitations. RFC 2328 - OSPF Version 2 - Document defining the current standard. OSPFD Resource Page - Resource page for the ospfd routing software, a complete annotated C++ implementation of the OSPF routing protocol RFC 3883 - Detecting Inactive Neighbors over OSPF Demand Circuits - Standard extending the demand-circuits extension of OSPF to deal better with down neighbours. Open Shortest Path First IGP (ospf) - The IETF page detailing work on the Open Shortest Path First Interior Gateway Protocol Working Group. The Includes links to all the most recent Internet-Drafts and RFC's.