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| 6.6 |  | Multiarea OSPF Configuration and Verification |
| 6.6.3 |  | Verifying multiarea OSPF operation |

In addition to the show commands discussed in Module 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.

| Lab Activity e-Lab Activity: Verifying Multiarea ODPF Operation The purpose of this lab is to use a few show commands to verify multiarea OSPF operation.