OSPF two records with the same network but diferent cost

Unanswered Question
Nov 5th, 2007


I have a special condition and i need repair this sitiation...

i have a 6509 directly connect with cluster firewall checkpoint .. the firewall send to 6509 many networks to 6509 but 1 network appear 2 times in route table with the same next hop but diferent cost [110/2] via, 00:10:21, Vlan60

[110/101] via, 1d08h, Vlan60


I have this problem too.
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Kevin Dorrell Mon, 11/05/2007 - 04:50

That is very unusual. Normally I would expect the [110/101] not to get into the routing table.

It would be interesting to see a show ip route to see more detail about how they manage to be both in the routing table. I presume the entries have the same prefix and length. Also, it is not clear what sort of route they are: O, IA, E1, or E2.

You could try a clear ip route That will reconstruct the live routing table from the underlying routing protocol, in this case OSPF.

If that doesn't do the trick, could you post a show ip ospf database?

Kevin Dorrell


paul.matthews Mon, 11/05/2007 - 08:51

As Kevin says, that is rather unusual! Was this a transient state, or did it remain like this for some time? Checking the OSPF LSA database would be good, but what version of IOS are you running? I would be tempted to look at the bug toolkit to see if this may be a known bug.


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