Open Shortest Path First v2 (OSPF)

Open Shortest Path First v2 (OSPF) is a link-state routing protocol defined by RFC 2328. OSPF automatically locates neighboring IPv4 routers within an autonomous system, typically with multicast, and exchanges IPv4 routing information for networks reachable through each neighbor.

OSPF is an interior routing protocol (IGP), and facilitates routing between private links or segments of local networks.