From: Gary Duncanson (gary.duncanson@googlemail.com)
Date: Sat Mar 29 2008 - 06:12:55 ART
Group,
Im considering using as-path prepending in a situation where I can't use MED.
The requirement is fairly simple but I can't lab it up today. AS 101 learns
routes to AS301 via ebgp peerings to AS201. I would like AS101 to prefer to
use one link to AS201 over the other to get to AS301 prefixes.
The issue is the examples I have seen illustrate using AS-PATH prepending on
the routers withing the AS that actually announces the prefixes your
downstream AS needs to get to. In my case I would need a solution on the
transit AS so to speak. Will this work?
If so then I figured a simple route-map and set as-path prepend 201 would
ensure the AS101 routers use the preferred link.
Thoughts?
Thanks
Gary
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