[c-nsp] BGP Q

Scott Granados sgranados at jeteye.com
Tue Oct 24 14:06:54 EDT 2006

Sure, this is where prefix lists come in.  So something like this would

Ip pref tenblock seq 5 perm le 24

Anything matching /16 to /24 should work here but anything like a /25 or
so on should be blocked.  Does this help?

G. Scott Granados
Sr. Network Operations Specialist
OFFICE: 415-946-2112 EXT. 222
CELL: 408-569-4017
URL: http://www.jeteye.com

-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of
fredrik.jacobsson at seb.se
Sent: Tuesday, October 24, 2006 10:55 AM
To: cisco-nsp at puck.nether.net
Subject: [c-nsp] BGP Q


Time for a newbie BGP question...

We like to have control over which networks that are announced to us,
so we're using prefix-lists associated to the neighbors. This is a
network using BGP with private AS's. No internet and such.

All fine, but it's a bit too much administration with the exact matches
needed by the prefix-lists.
Is there a way to allow all advertisements within for example ?
Meaning that I don't have to care about what's specifically announced?
(aggregate-address on the other end is not an option)

So that they may add for example to their list of a 
other /24's announced to us without any administration at my end...

Best regards

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