OSPF (Open Shortest Path First )

OSPF (Open Shortest Path First )

Open Shortest path First (OSPF ) is a Link state Routing Protocol . It is Open standard Routing protocol that means can support any Vendors unlike EIGRP. OSPF use Dijkstra algorithm to find the Shortest path First in the network. Link state protocol update Routing table when change accure in the Routing topology and then it create Link state Advertisement (LSA) . OSPF support Classless IP address.

OSPF Feature

  • OSPF support Classless
  • OSPF provide fast conversion comparison to RIP
  • OSPF allow scalability
  • OSPF Support VLSM/CIDR
  • OSPF is a Open standard protocol which support multiple vendor deployment .
  • OSPF has Unlimited hop Count.

Link State Advertisement (LSA) -: Router use LSA to learn about the topology of entire network area. Link is Router interface which assign to the nework. LSA is contain Link state and routing information in the network which shared to the other router in the network. Router do not send update their entire Routing table only send update when change occur in the network.

Router ID– : Router ID (RID ) is highest IP address of the Router among the all Loopback interfaces available. Router ID used to represent Router in the network. if there is no any Loopback address found on the Router interfaces then it will take highest active IP address of Configure interfaces. Loopback address has the advantage never going down.

Neighbor -: when a two or more then two Router connected with point to point serial link , then both router is neighbor for each other.

By vichhaiy Posted in Cisco

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