On Fri, Mar 29, 2013 at 8:36 AM, Adam Vitkovsky <adam.vitkovsky@swan.sk> wrote:
If the best route you pick for the customer's advertisement goes to your upstream instead of your customer, you won't advertise it to your peer. And if your customer sets a BGP community defined to mean "don't advertise to peers" then you won't advertise it to the peer. Yet they may well transmit packets to you for which delivery to that peer is directed by your routing table.
Yes asymmetric routing would kill the update-based urpf unless there would be an informational urpf NRLI we could use for these purposes
Hi Adam, If we go down that path, let's not overload BGP. A distinct source address advisory protocol could have highly desirable auto-aggregation and update rate characteristics versus BGP. Regards, Bill Herrin -- William D. Herrin ................ herrin@dirtside.com bill@herrin.us 3005 Crane Dr. ...................... Web: <http://bill.herrin.us/> Falls Church, VA 22042-3004