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Other proposals (discussion initiated by David Black) ECN marking, RFC 3168 Advantages Uses standard ECN procedure DSCP remarking is not required Problems End-to-end scope, cannot be over-defined for local (edge-to-edge) use Can be used only for elastic traffic Terminating/preempting the required number of flows to solve the congestion is difficult (no indication of the per flow congestion percentage) Discovering if end points are ECN capable |