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Conditions for severe congestion Severe congestion: due to link/router failure rerouting causes (up to 100%) overload in the new path Queues are over-floated, packets may be dropped Packet drop cannot be tolerated, terminating/preempting flows are needed Marking based on rate (for inelastic traffic) or queue length (for elastic traffic) measurement Decision is done in the edge node, reaction only if a threshold is exceeded Desirable time frame to restore normal operation: seamless handover requirements for inelastic traffic, e.g. 200 ms |