OSPF TSA no default route

Unanswered Question
Apr 23rd, 2008


This is a campus network with a central core(6500), building aggregation (4500 sup6) and routed access(4500 sup6)

I'm trying split my network into different area, 1 area per building. Got a voip and user vrf in each building.


My access switch are not receiving a default route. All intra area route are there. The area is configure as a TSA.

any Idea

I have this problem too.
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Harold Ritter Wed, 04/23/2008 - 08:38

Bonjour Dominic,

You could start by looking at if the default route has been originated by the ABR by looking at the ABR's lsdb:

sh ip ospf database summary | incl

If it is in there, run the same command on the access switch and post the output.


dominic.caron Wed, 04/23/2008 - 11:59

Routes are in the database, but not in the routing table.

Funny thing...route are ok in the global routing table (used for management). On my user and voip vrf, all router think they are ABR...but there is only 1 area configured

Connected to MPLS VPN Superbackbone, VRF voip

It is an area border router

Harold Ritter Wed, 04/23/2008 - 14:18


You mean the route is also in the LSDB of the access router. Can you provide the output for show ip ospf data summary.


Harold Ritter Wed, 04/23/2008 - 14:51


I had overlooked the fact that this is a vrf-lite configuration.

Try configuring "capability vrf-lite" under router ospf for the specific vrf on the access router. The down bit is set by the ABR in a VRF context and will therefore not be installed in the RIB by default. This command will cause the down bit to be ignored.



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