Open Shortest Path First

Routing protocol for IP networks / From Wikipedia, the free encyclopedia

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Open Shortest Path First (OSPF) is a routing protocol for Internet Protocol (IP) networks. It uses a link state routing (LSR) algorithm and falls into the group of interior gateway protocols (IGPs), operating within a single autonomous system (AS).

Quick facts: Purpose, Introduction, RFC(s)...
Open Shortest Path First
Communication protocol
PurposeRouting protocol
Introduction1989; 34 years ago (1989)
RFC(s)1131, 1247, 1583, 2178, 2328, 3101, 5709, 6549, 6845...
Quick facts: Introduction, RFC(s)...
OSPF for IPv6
Communication protocol
Introduction1999; 24 years ago (1999)
RFC(s)2740, 5340, 6845, 6860, 7503, 8362...

OSPF gathers link state information from available routers and constructs a topology map of the network. The topology is presented as a routing table to the Internet Layer for routing packets by their destination IP address. OSPF supports Internet Protocol Version 4 (IPv4) and Internet Protocol Version 6 (IPv6) networks and supports the Classless Inter-Domain Routing (CIDR) addressing model.

OSPF is widely used in large enterprise networks. IS-IS, another LSR-based protocol, is more common in large service provider networks.

Originally designed in the 1980s, OSPF is defined for IPv4 in protocol version 2 by RFC 2328 (1998).[1] The updates for IPv6 are specified as OSPF Version 3 in RFC 5340 (2008).[2] OSPF supports the Classless Inter-Domain Routing (CIDR) addressing model.