OSPF is primarily used for internal routing because it's a link-state routing protocol. OSPF is based on Dijkstra's algorithm for finding shortest paths between two points.

Why do companies use OSPF?

OSPF is an internal routing protocol. (While primarily used inside a single company, it can span multiple sites.) ... Like other dynamic routing protocols, OSPF enables routers to disclose their available routes to other routers.

What is use of OSPF in networking?

Open Shortest Path First (OSPF) is a link-state routing protocol that was developed for IP networks and is based on the Shortest Path First (SPF) algorithm. OSPF is an Interior Gateway Protocol (IGP). ... OSPF provides equal-cost multipath routing. You can add duplicate routes to the TCP stack using different next hops.