What does routing protocol ospf?

OSPF, or Open Shortest Path First Protocol is an industry standard link state routing protocol used to determine best paths across an IP v4 computer network. OSPF v3 is currently completing development and will provide best path information through IPV6 networks. Link State routing protocols rely on the flooding of Link State Advertisments between neighboring routers in a network to build a database of the interfaces and the neighbor routers connected to those interfaces. This information is then processed using the SPF or Dyksrta algorythm in order to build a "map" of the network. Costs, based on the bandwidth of the individual interfaces, can be calculated to determine the best (lowest cost) path from the router to any network in the domain. OSPF is officially described in RFC 2328 and is an open standard. It is probably the most popular interior gateway protocol in use today.