All Cisco QoS books and papers are focused on managing congestion over output queues (TxQ). There is few or no mention to INPUT queues. What is the reason? Is it so irrelevant?
Please consider this scenario: A hub-and-spoke network (central node "A") with 2 remote nodes ("B" and "C") connected to "A" through FR PVCs. "B" is only transmitting VoIP to "A" and "C" is only transmitting data. "A" receive both traffics in the same interface. If "C" is flooding with FTP traffic the INPUT queue in "A", What do I do to avoid that VoIP traffic coming from "B" be discarded in "A", at the ingress? How do you manage congestion in "A" INPUT queue?