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Proposed Charter (2) The initial scope of the WG is the use of PCN within a single DiffServ region. The overall approach will be based on a separation of functionality between the interior routers and edge nodes of the DiffServ region. Interior routers mark packet headers when their traffic is above a certain level, as an early warning of incipient congestion (“pre-congestion”); this builds on concepts from The Addition of Explicit Congestion Notification to IP” (RFC 3168). Edge nodes of the DiffServ Region monitor the markings and that information is used to make flow admission control and pre-emption decisions. The decisions could be made by the edge nodes or by a centralized system (which is informed of the edge nodes measurements). |