From: Geert Nijs (geert.nijs@simac.be)
Date: Thu Jan 13 2005 - 11:12:06 GMT-3
Did you do a clear ip bgp * after implementing the filter ?
Geert
________________________________
From: nobody@groupstudy.com on behalf of ccie2be
Sent: Tue 1/11/2005 23:38
To: Group Study
Subject: ip prefix-list
Hey guys,
Here's something interesting.
It took me a while, but finally I got it into my head how to create an
ip prefix list ie if you have something like this:
ip prefix-list ALLOW-BGP-IN seq 5 permit 112.0.0.0/5
the slash without being followed by a le or ge means
the prefix must = 112.0.0.0 and the mask must be 248.0.0.0
This also means that 112.0.0.0/8 wouldn't match.
Does everyone agree?
Well, I just came across a scenario which breaks this rule.
I was using the above prefix-list to filter all routes except
112.0.0.0/8
113.0.0.0/8
114.0.0.0/8
115.0.0.0/8
116.0.0.0/8
117.0.0.0/8
118.0.0.0/8
119.0.0.0/8
It worked but based on the rule above it shouldn't have, right?
Can anyone explain why my seemingly "incorrect" prefix-list
allowed those routes?
TIA, Tim
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