A multicast storm arises when excessive multicast traffic is exchanged on network ports. Excessive traffic includes more than expected traffic, or which exceeds a limit value or some percentage of network traffic, or a percentage of network channel capacity.

To prevent this, a warning message, along with port-shutdown option, is displayed to the user when the network detects similar multicast packets. At this time, the user can disable the port temporarily and enable it again, or permanently disable it.