BUG (?) in the ospf ABR LSA Type 3 filtering

Unanswered Question
Nov 26th, 2007


I'm working with following topology: http://www.talpink.lt/images/v.php?id=29126p2.JPG

Device configurations can be found here:


The result of

area 0 filter-list prefix F1 in

command executed in R2 router was very strange, as supposed, this command filtered summary LSA of prefix in Area 0 (prefix disappears from R3's routing table and LSA database as supposed), however is still injected into Area 2 as Type 3 LSA (and to any other areas which are directly connected to R2), this is definitely a bug (probably caused by LSA injection optimizations), type 3 LSA should never be injected from one non-backbone area to another.

I have this problem too.
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mchin345 Mon, 12/03/2007 - 13:08

area area-id filter-list prefix {prefix-list-name in | out} specify the out parameter in your ABR (ie) Prefix list applied to prefixes advertised out of the specified area to other areas.


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