From: Alec (clapun@graduate.hku.hk)
Date: Sat Feb 21 2004 - 15:16:45 GMT-3
Michael,
Could u explain why prefix list can be solved ? BTW, where does the
prefix-list apply ? Still can't think of how does it relate to building the
BGP entry in R2.
----- Original Message -----
From: "Michael Snyder" <msnyder@revolutioncomputer.com>
To: <ccielab@groupstudy.com>
Cc: "'Alec'" <clapun@graduate.hku.hk>
Sent: Sunday, February 22, 2004 2:10 AM
Subject: RE: BGP aggregate quiz
> Prefix lists
>
> Something like this.
>
>
> ip prefix-list one seq 5 deny 192.68.0.0/16
> ip prefix-list one seq 10 permit 0.0.0.0/0 le 32
>
> ip prefix-list two seq 5 deny 192.68.0.0/16 ge 24 le 24
> ip prefix-list two seq 10 permit 0.0.0.0/0 le 32
>
> -----Original Message-----
> From: Alec [mailto:clapun@graduate.hku.hk]
> Sent: Saturday, February 21, 2004 12:03 PM
> To: ccielab@groupstudy.com
> Subject: BGP aggregate quiz
>
> Hi group,
>
> Really stuck by this BGP quiz. Anyone can shed some light ? Assuming
> two
> prefixes 192.68.1.0/24 and 192.68.2.0/24 are coming from the AS and R1
> is
> doing an aggregate. The trickiest part is how to make build an entry
> 192.68.0.0 on R2's BGP table (note that there is no slash subnet mask!!)
>
> AS ----- R1 ------ R2
>
> R1 BGP Table after aggregate
> *> 192.68.0.0/16
> *> 192.68.1.0
> *> 192.68.2.0
>
> R2 BGP Table which is goal to this senario.
> *> 192.68.0.0
>
> R1'router must advertise by 192.68.0.0 except /16'mark
> Don't see "/16" word in R2 and it must see "192.68.0.0" only.
> Don't see "S" suppress mark in R1.
> Don't use summary-only command by R1.
>
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