OSPF allows networks to be grouped into areas. The designated router concept reduces the number of adjacencies required on a multi-access network. The designated router floods a link state advertisement for the multi-access network and has other special responsibilities. ![]() Each multi-access network that has at least two attached routers has a designated router and a backup designated router. Each participating router distributes its local state (i.e., the router’s usable interfaces and reachable neighbors) throughout the AS by flooding. In a link-state protocol, each router maintains a database describing the entire AS topology, which it builds out of the collected link state advertisements of all routers. OSPF is suitable for complex networks with a large number of routers because it provides equal-cost multi-path routing, where packets to a single destination can be sent via more than one interface simultaneously. OSPF chooses the least-cost path as the best path. ![]() OSPF is an interior gateway protocol that distributes routing information between routers in a single autonomous system (AS). Open Shortest Path First Routing (OSPF) is a shortest path first or link-state protocol. Ip ospf traffic-eng administrative-weight ![]() Fast Open Shortest Path First (OSPF) Related Topicsįast Open Shortest Path First (OSPF) Overview
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