From: Hossam (sam6626@yahoo.com)
Date: Sat Jan 31 2004 - 07:41:24 GMT-3
I am trying to configure a BGP router R2 in (AS 65 256 and Bgp Confideration indentifier 200) to limit it advertesment to its EBGP neighbour (R4 in AS 300) to the routes that was originated in AS 200.
I noticed that while i am AS-path filtering (either via filter-list or a route map) and an ip as-path accesslist that permits only ^200$, nothing gets advertised to the neighbour R4.
Once i remove the as-path filtering i get the routes with AS-path = 200 at R4 as expected.
I think the problem is that R2 has the routes with AS-path = (65078) cause of the confidertaions in its BGP table.
It seems that the IOS does the filtering first and then it strips of the confiderations as-path just before advertesting the routes to EBGP neighbour.
Now the question is: what is the best way to do the filtering in this case? i hate the idea of filtering on the SUB ASs...any ideas...
Thanks..
SAM
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