From: ccie2be (ccie2be@nyc.rr.com)
Date: Tue Jan 11 2005 - 19:54:35 GMT-3
Oops, I thought I did but apparently not.
Actually, I used "clear ip bgp <ip addr> in prefix-list"
(This is part of the Outbound Route Filtering config.)
Good catch. Thanks.
----- Original Message -----
From: "marvin greenlee" <marvin@ccbootcamp.com>
To: "'ccie2be'" <ccie2be@nyc.rr.com>; <ccielab@groupstudy.com>
Sent: Tuesday, January 11, 2005 5:49 PM
Subject: RE: ip prefix-list [bcc][faked-from]
> Did you clear your BGP process after changing your filtering? What is the
> rest of your BGP config?
>
> - Marvin Greenlee, CCIE#12237, CCSI# 30483
> Network Learning Inc
> marvin@ccbootcamp.com
> www.ccbootcamp.com (Cisco Training)
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> ccie2be
> Sent: Tuesday, January 11, 2005 2:38 PM
> To: Group Study
> Subject: ip prefix-list [bcc][faked-from]
> Importance: Low
>
> 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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