Storm control prevents broadcast storms caused by broadcast packets, unknown multicast packets, and unknown unicast packets. It is configured in the interface view to limit the number of packets per second.
In a detection interval, a switch with storm control configured monitors the average rates of incoming packets on an interface and compares the average rates with the thresholds. When the rate of a particular type of packets exceeds the threshold allowed for these packets, the switch takes a storm control action on the interface.