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OSPF Routing Protocol



OSPF Routing Protocol


Open Shortest Path First (OSPF) protocol for Internet Protocol (IP) networks. It uses a link state routing (LSR) algorithm and falls into the group of interior gateway protocols (IGPs), operating within a single autonomous system (AS). It is defined as OSPF Version 2 in RFC 2328 (1998) for IPv4.


OSPF supports/provides/advantages –
  • Both IPv4 and IPv6 routed protocols
  • Load balancing with equal cost routes for same destination
  • VLSM and route summarization
  • Unlimited hop counts
  • Trigger updates for fast convergence
  • A loop free topology using SPF algorithm
  • Run on most routers
  • Classless protocol
There are some disadvantages of OSPF like, it requires extra CPU process to run SPF algorithm, requires more RAM to store adjacency topology and more complex to setup and hard to troubleshoot.

the topology / Configuration









Now, configuring OSPF for R1.

R1(config)#router ospf 1
R1(config-router)#network 192.168.10.48 0.0.0.7 area 1
R1(config-router)#network 10.255.255.80 0.0.0.3 area 1
R1(config-router)#network 10.255.255.8 0.0.0.3 area 1


Now, configuring R2

R2(config)#router ospf 1
R2(config-router)#network 192.168.10.64 0.0.0.7 area 1
R2(config-router)#network 10.255.255.80 0.0.0.3 area 1


Similarly, for R3

R3(config)#router ospf 1
R3(config-router)#network 192.168.10.16 0.0.0.7 area 1
R3(config-router)#network 10.255.255.8 0.0.0.3 area 1

You can check the configuration by typing command

R3#show ip protocols












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