NANOG members, I have a question to the group regarding how best to avoid blackholing routes to peers on an ATM NAP when using route servers. There is a case wherein my peering partner and I both have active PVCs to the route servers, but the PVC between my peering partner and my router is down. Thus, we both see routes from the route server with each other's IP as next-hop, but since our direct PVC is down that next-hop is no good. It'd like a way to automatically and efficiently detect loss of next-hop and discard routes accordingly. Are folks generally using OAM keepalives, and if so, any parameters for OAM interval time and dead/alive count that seem practical? Thanks, -- Reid Knuttila Network Engineer Onvoy