8 Apr
1999
8 Apr
'99
11:16 p.m.
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