Cisco Route filtering [was Re: OPS: BGP spew from ASN 7374]
CMartin at mercury.balink.com
Thu Apr 8 23:16:15 UTC 1999
> I've had a question on this for some time that maybe can get answered
> Let's assume for a moment that I have a network of 209.123/18
> (1/4 of a
> classful B).
> Let's further assume that my upstream filters me with:
> access-list 2002 permit ip host 22.214.171.124 host 255.255.0.0
> neigh 126.96.36.199 distrib 2002 in
> Will my /18 announcement make it through this /16 filter?
No. The ACL specifies an exact match.
> Would the same be true with a prefix-length filter, which I assume the
> syntax would be:
> ip prefix-list 1 permit 188.8.131.52/16
> neigh 184.108.40.206 prefix-list 1 in
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