Originally designed in the 1980s, OSPF version 2 is defined in RFC 2328 (1998). IS-IS, another LSR-based protocol, is more common in large service provider networks. OSPF supports Internet Protocol version 4 (IPv4) and Internet Protocol version 6 (IPv6) networks and is widely used in large enterprise networks. The topology is presented as a routing table to the internet layer for routing packets by their destination IP address. OSPF gathers link state information from available routers and constructs a topology map of the network. 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). Open Shortest Path First ( OSPF) is a routing protocol for Internet Protocol (IP) networks.
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