From: Michael Snyder (msnyder@revolutioncomputer.com)
Date: Sat Feb 21 2004 - 15:10:59 GMT-3
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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