How to filter external OSPF routes from database ?

How to filter external OSPF routes from database ?

Here is an example:

R1------Ar0------R2------Ar1-------R3

R1 redistributes routes into Area 0.

I want ot configure R2 so R3 does not have a specific external route in its
database.

I tried on R2:
<<<
ip prefix-list R1toR3 seq 5 deny 1.1.12.0/24
ip prefix-list R1toR3 seq 10 permit 0.0.0.0/0 le 32
router ospf 1
 area 1 filter-list prefix R1toR3 in
>>>

but it looks like external routes can not be filtered with filter list. As
soon as I advertise 1.1.12.0/24 on R1, instead of redistributing it, it
disappears from R3's database and routing table.

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Received on Mon Nov 09 2009 - 15:44:25 ART