Describe the Open Shortest Path First (OSPF) protocol.

What will be an ideal response?


Open Shortest Path First (OSPF) is an open standards, link-state routing protocol that supports classless routing, variable-length subnet masks, and authentication.

Link-state routing protocols allow routers to share a common view of the entire network. Each router sends out link-state advertisements (LSAs) describing its attached links to all routers in an area. These LSAs are not periodic. Instead, they are sent only when a change occurs in the network. The nonperiodic nature of the updates saves network bandwidth. The downside of link-state routing protocols comes from the need for each router to hold a topological database of the entire area; this requirement increases CPU and memory demands on a router. Because OSPF creates an adjacencies database (basically a neighbor database similar to EIGRP), a topological database, and a routing table, it requires more memory to run than a simple protocol such as RIP, which only creates a routing table. OSPF parameters are also much more complex to configure.

Computer Science & Information Technology

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