OSPF (Open Shortest Path First) is a widely used and supported routing protocol. Here are some key points about OSPF:
Intradomain Protocol:
OSPF operates within a single autonomous system (AS), which means it’s used within a specific network or area.
Link-State Algorithm:
OSPF uses a link-state routing (LSR) algorithm. Each router maintains information about every domain, allowing it to determine the shortest path.
LSAs and LSDB:
OSPF routers exchange Link State Advertisements (LSAs) to learn about other routers, subnets, and network details. This information is stored in a link-state database (LSDB).
Areas:
OSPF divides an AS into areas. Routers within an area share routing information. Special routers called Area Border Routers (ABRs) summarize area information and communicate with other areas.
Neighbor Relationships:
OSPF routers become neighbors by exchanging LSDB information. They choose the best route based on the Shortest Path First (SPF) calculation.
Remember, OSPF helps build a complete view of the network topology, allowing routers to find optimal paths.
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