Common Open Policy Service (COPS)— The protocol that communicates QoS policies and enforcement between devices on a network.
COPS management is supported on the Catalyst 6000 COS switch family with a Layer 3 switching engine (PFC or PFC2).
Policy Decision Point (PDP)— Maintains QoS policies and rules that will be enforced within the network. Traffic conditions can be polled and can affect how the policies are implemented. A typical PDP might be a host running Cisco QoS Policy Manager (QPM).
Policy Enforcement Point (PEP)— A device consisting of physical interfaces, controlled by a PDP. QoS policies are sent down to a PEP, where they are enforced in a granular fashion. Typical PEPs are routers and switches.
COPS configures ...