RFC 3883 - Detecting Inactive Neighbors over OSPF Demand Circuits
- Standard extending the demand-circuits extension of OSPF to deal better with down neighbours.
- http://tools.ietf.org/html/rfc3883

RFC 1793 - Extending OSPF to Support Demand Circuits
- Defines an extension to make the protocol suitable for networks where cost varies with usage.
- http://tools.ietf.org/html/rfc1793

RFC 1245 - OSPF protocol analysis
- Describes the uses and requirements of the protocol, suitable applications, and limitations.
- http://tools.ietf.org/html/rfc1245

RFC 2328 - OSPF Version 2
- Document defining the current standard.
- http://tools.ietf.org/html/rfc2328

RFC 1247 - OSPF Version 2
- An older version of the standard.
- http://tools.ietf.org/html/rfc1247

RFC 1584 - Multicast Extensions to OSPF
- Standard document.
- http://tools.ietf.org/html/rfc1584

RFC 1583 - OSPF Version 2
- An older version of the standard.
- http://tools.ietf.org/html/rfc1583

OSPF Protocol - Open Shortest Path First
- Commercial OSPF version 2 implementation.
- http://www.futsoft.com/ospf.htm

Open Shortest Path First - Cisco Systems
- Technical papers, FAQs, configuration and troubleshooting.
- http://www.cisco.com/en/US/tech/tk365/tk480/tsd_technology_support_sub-protocol_home.html

OSPFD Resource Page
- Resource page for the ospfd routing software, a complete annotated C++ implementation of the OSPF routing protocol
- http://www.ospf.org/

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.
- http://www.ietf.org/html.charters/ospf-charter.html