Traffic storm control is a feature that prevents LAN ports from being disrupted by a broadcast, multicast, or unicast traffic storm on physical interfaces. Traffic storm control monitors the level of each traffic type for which it is enabled in 1-second intervals and compares it with the configured threshold, which is a percentage of the total available bandwidth of the port. When the ingress traffic reaches the threshold, traffic storm control drops the traffic until the end of the interval. Traffic storm control uses the Individual/Group bit in the packet destination address to determine if the packet is unicast or broadcast. This bit is set to 0 for unicast addresses and 1 for multicast or broadcast addresses. Traffic storm control does not use the source address to classify the traffic type. References := Configuring Traffic Storm Control - Cisco, Understanding Cisco Traffic Storm Control - NetCraftsmen
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