5.7 Monitoring Multiarea OSPF
5.7.1 Verifying multiarea OSPF operation
In addition to the show commands discussed in Chapter 4, several key OSPF commands can be used to verify multiarea operation.
  • show ip ospf border-routers - Displays the internal OSPF routing table entries to an ABR.
  • show ip ospf virtual-links - Displays parameters about the current state of OSPF virtual links.
  • show ip ospf process-id - Displays information about each area to which the router is connected, and indicates whether the router is an ABR, ASBR, or both. The process ID is a user defined identification parameter. It is locally assigned and can be any positive integer number. The number used here is the number assigned administratively when enabling the OSPF routing process.
  • show ip ospf database - Displays the contents of the topological database maintained by the router. Several keywords can be used with this command to get specific information about the following links:
  • show ip ospf [process-id area-id] database [router] - Displays individual router link-state information.
  • show ip ospf [process-id area-id] database [network] - Displays network link-state information. The area ID is the area number associated with the OSPF address range defined in the network router configuration command when defining a particular area.
  • show ip ospf [process-id area-id] database [summary] - Displays summary information about ABR link states.
  • show ip ospf [process-id area-id] database [asbr-summary] - Displays information about ASBR link-states.
  • show ip ospf [process-id area-id] database [external] - Displays information about autonomous system external link states.
  • show ip ospf [process-id area-id] database [database-summary] - Displays database summary information and totals.