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ECN marking, probes Using RFC 3168 in a local domain, sending ECN probe packets Advantages Uses standard ECN procedure DSCP remarking is not required Disadvantages Slow response (depending on the frequency of probes) Additional load to network No association between probes and the end-to-end sessions Terminating/preempting the required number of flows is difficult (no indication of the per flow congestion percentage) How to distinguish between probe packets and other ECN packets? Using ECN additional procedures needed: Discovering if Ingress and Egress are ECN capable Define the probe packets |