Guidelines and Limitations for WRED Explicit Congestion Notification
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Explicit Congestion Notification (ECN) parameters are configurable only at system level.
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Weighted Random Early Detection (WRED) cannot be configured alone on a Quality of Service (QoS) group. ECN is enabled by default.
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You must configure WRED thresholds for 10 G interfaces and 40 G interfaces even when no interfaces are present.
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WRED ECN is not applicable to multicast or broadcast traffic.
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WRED ECN is not supported on Nexus 5000 series switches.