[c-nsp] BGP neighbor route-map or prefix-list ?

[Scott Granados]

Honestly, community tags might be the best in combination with route maps.

Something like

route-map transit-out perm 10
match community 15
yada yada yada

The basic answer to your question though as far as I know is that this 
should be fine.  You would be using the route-map to control your 
announcements so no need for the prefix list statement as long as you have 
the appropriate match mechanism encased in your route-map.


-----Original Message----- 
From: Jeffrey G. Fitzwater
Sent: Friday, September 16, 2011 10:06 AM
To: cisco-nsp at puck.nether.net
Subject: [c-nsp] BGP neighbor route-map or prefix-list ?

I have been using the ( neighbor xxx.xxx.xxx.xxx prefix-lit myPrefix out ) 
to control what prefixes we announce to our  ISPs.

I now have a need to do a little more prefix filter control using ( neighbor 
xxx.xxx.xxx.xxx route-map myRouteMap out ) .


Can I just do all the PREFIX filtering using the ( neighbor xxx.xxx.xxx.xxx 
route-map myRouteMap out )  and remove the ( neighbor xxx.xxx.xxx.xxx 
prefix-lit myPrefix out )?


Is there any reason to keep the ( neighbor xxx.xxx.xxx.xxx prefix-lit 
myPrefix out ) bgp command or is it just redundant with the route-map 
command?


I just need to do more control on what PREFIXES get advertised to our peers.





Thanks for any help.



Jeff Fitzwater
OIT Network Systems
Princeton University
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