Finding out the OSPF areas in a network

[deepu-abraham]

Hi,

I am looking at a large network with multiple areas. However, the network isn't documented very well. Is there any command on the Cisco router to find out all the OSPF areas within this OSPF domain?

Regards,

Deepu.

[Satwant Singh]

[deepu-abraham]

When I issue this command on our distribution router, I can only see area 0.

We are peering with our service provider using OSPF on a single area (backbone area), area 0. At the remote sites, our WAN links are in area 0 with the same service provider. However, the LAN links are in a different area. Different remote sites have different area on their LAN links. However, the area is the same within a remote site. Our service provider uses BGP internally (MPLS network) and hence, they redistribute our OSPF into their BGP on their CPE.

I am not sure if this is affecting it.

[Rolf Fischer]

You will find the non-backbone area IDs only on area border routers (ABRs). On your distribution router  you can do a 'show ip ospf border-routers" to find the ABRs. Then, on each ABR you can use several commands, for instance 'show ip ospf', 'show ip ospf interface brief', 'show ip ospf database', 'show ip protocols' etc.

HTH
Rolf

[paul driver]

Hello

Review this excellent CSC documentation on such a mater:
https://sreading-and-understanding-ospf-database

res
Paul

[Julio E. Moisa]

Hi

You could use show ip ospf database and its arguments.

Hope it is useful

:-)

[deepu-abraham]

I don't see any options where I can see all the areas that are present in this AS.