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The Open Shortest Path First (OSPF) protocol is a link-state protocol. The state of a link, or interface on a router, is a description of that interface and its relationship to its neighboring routers. The link-state description includes, for example, the IP address of the interface, the mask, the type of network it is connected to, the routers connected to that network and so on. The collection of all these link-states form the link-state database. OSPF uses this link-state database to build and calculate the shortest path to all known destinations.
Note:
You can configure OSPF parameters only on an interface that has an IP address assigned to it.