OSPF LAS Types

[zekebashi]

Hello, 

See attached. When I issue the sh ip ospf database command, the output lists the LSA types. Under LSA 1(Router), it lists that the Adv Router 10.255.255.254 has 5 links and when I issue the sh ip ospf int brief command on the same router, it only shows 4 links. Is the P2P considered as 2 links? 

Thanks in advance. 

Best, ~zK 

[Peter Paluch · Accepted solution]

Hello,

Yes, a point-to-point interconnection between two routers is represented using two links in an LSA1: One link represents the point-to-point interconnection between two routers, the other link represents the IP network on the point-to-point interconnection.

A couple of years ago, I had a more in-depth discussion on this topic here - you might be interested:

https://supportforums.cisco.com/discussion/11608991/ospf-termonilogy-stub-network#comment-7834706

Best regards,
Peter

[zekebashi]

Thanks, Peter. 

Yes, now I understand. The output produced from the adv router matches your explanation. 

Much appreciated. 

Best, ~zK