29 Mar
2013
29 Mar
'13
8:36 a.m.
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