nanog mailing list archives
RE: Cisco Route filtering [was Re: OPS: BGP spew from ASN 7374]
From: "Martin, Christian" <CMartin () mercury balink com>
Date: Thu, 8 Apr 1999 19:16:15 -0400
I've had a question on this for some time that maybe can get answered here. 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 209.123.0.0 host 255.255.0.0 neigh 2.3.4.5 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 209.123.0.0/16 neigh 2.3.4.5 prefix-list 1 in
Same deal. Chris
Current thread:
- RE: Cisco Route filtering [was Re: OPS: BGP spew from ASN 7374] Martin, Christian (Apr 08)
- RE: Cisco Route filtering [was Re: OPS: BGP spew from ASN 7374] Alex P. Rudnev (Apr 09)