Mike Leber wrote:
If they set local pref for both peers and customers to 100 how do they ensure that the customer transit routes are announced to peers?
The reason I ask this is because if a customer announces a customer of theirs to you that a peer also has as a customer >you will have equal length routes for the same destination AS. While there are many ways to deterministicly prefer customer routes, local pref is the most common.
AS 701 always announces the best route, as their routers know it. Their average AS-path length is under 2, so it doesn't seem to be a problem. If a customer of AS 701 wants to insure that his/her route is advertised in all cases, s/he could send a community which AS701 edge devices could use to manipulate local-preference upward. [this was covered in a previous posting on this topic] I leave it to your imagination whether peers would be permitted to do this. -David Barak I only speak for myself. "Quis custodes ipsos custodiet?" - Juvenal __________________________________________________ Do You Yahoo!? Check out Yahoo! Shopping and Yahoo! Auctions for all of your unique holiday gifts! Buy at http://shopping.yahoo.com or bid at http://auctions.yahoo.com