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Re: Not so newbie BGP question...
> I'm not positive but, is it possible to have 65501 prefer 65502_65503 > (using localpref on the 65501<->65502 transit connection) over 65503 > direct routes learned via the regional exchange? Yep, and you may even be able to do it yourself if they've implemented the RFC1998 stuff. > In this situation, all concerned have agreed that since 65501 is a common > transit provider, it is not expected that they pref routes TO customers or > customers of customers via the regional exchange. > > In a perfect world (someone speak up if you know how to do this!) we could > do this: > > Have 65501 pref regional exchange routes to 65502 and 65503 for traffic > originating inside of 65501 or from other 65501 transit customers. Don't need to do that [typically non-standard thing] if you can do this: > Have 65501 pref the 65501<->65502 transit connection for traffic > originating from outside their AS or their transit customers. Again, the RFC1998 stuff, if supported by AS65501, will enable you [AS65502] to do this yourself. Of course, the above configurations tend to reduce the value of the Regional Exchange peering between AS65501 & AS65503, at least when considering the AS65503 ingress direction. They do still provide AS65503 with egress flexibility, as well as AS65503-AS65501 [non-transit] interconnectivity in the event that the AS65502 path becomes unavailable. -danny