The following summarizes the key points that were discussed in this section:
?– Troubleshooting OSPF involves looking at neighbor adjacencies, routing tables, and
authentication issues.
?– Use the show ip interface command to verify the MTU of an OSPF interface.
?– Use the show ip ospf interface command to help troubleshoot whether OSPF is enabled on
an interface.
?– Use the debug ip ospf adj command to troubleshoot OSPF authentication.
Chapter Summary
The Open Shortest Path First (OSPF) protocol is one of the most commonly used Interior Gateway
Protocols (IGP) in IP networking. OSPF is a complex, open-standard protocol that is composed
of several protocol handshakes, database advertisements, and packet types.
The following summarizes the key points that were discussed in this chapter:
?– The routing algorithm of OSPF maintains a complex database of topology information, which
routers use to maintain full knowledge of distant routers.
?– OSPF is a classless, link-state routing protocol that is widely deployed in many networks.
?– OSPF load-balances across four equal metric paths by default on Cisco routers.
?– OSPF supports plaintext and MD5 authentication.
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