> 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 adam
