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Community Member

Tunnel Interface to Area 0

Hi,

I just did a lab last night and got confused with the message I got from OSPF. Here's the setup.

R1----R2----R5-----R4

The link between R1 and R2 is area 0 and the link between R2 and R5 is area 1. R5 and R4 segment is area 2. The task mentioned that I can use another IP subnet to connect area 2 to the backbone so it gave me the idea that I should be using tunnel interface. I created a tunnel interface between R2 and R5 and put it in area 0. The routes propagated properly but on R5, i keep on receiving this message on the console.

Apr 8 12:15:31.011: %OSPF-4-ERRRCV: Received invalid packet: mismatch area ID, from backbone area must be virtual-link but not found from 141.11.123.2, Serial0/0

R1 and R2 segment is a frame-relay link. That is the 141.11.123.2 IP. The routing table is stable but I just wonder why do I keep on getting these message. I tried to change the tunnel interface to area 2 but I still receive the same error message. Thanks in advance.

Oh wait...I checked out the solution guide and the one I did was correct. It didn't use virtual-link because area 1 is an NSSA.

John

3 REPLIES
Cisco Employee

Re: Tunnel Interface to Area 0

Hi,

You are receiving those packets on serial0/0.

It seems R5 is connected to your FR backbone either with a static or dynamic mapping..

Also R5 should be configured with the no-summary option as it's an ABR like R2

HTH

Laurent.

Community Member

Re: Tunnel Interface to Area 0

Oh yeah... Maybe that's the reason why. R5 learned a mapping thru inverse-arp.

area 1 is a totally-NSSA but area 2 is not so I did not issue the no-summary option at R5 for area 2.

Cisco Employee

Re: Tunnel Interface to Area 0

I was thinking about area 1 not area 2.

R5 is an ABR for area 1 too just like R2

Laurent.

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