The Cisco switch must have Storm Control configured on all host-facing switchports.
A traffic storm occurs when packets flood a LAN, creating excessive traffic and degrading network performance. Traffic storm control prevents network disruption by suppressing ingress traffic when the number of packets reaches a configured threshold levels. Traffic storm control monitors ingress traffic levels on a port and drops traffic when the number of packets reaches the configured threshold level during any one-second interval.
Configure storm control for each host-facing interface as shown in the example below: SW1(config)#int range g0/2 – 8 SW1(config-if-range)#storm-control unicast bps 62000000 SW1(config-if-range)#storm-control broadcast bps 20000000 Note: The acceptable range is 10000000 -1000000000 for a gigabit Ethernet interface, and 100000000-10000000000 for a 10-gigabit interface. Storm control is not supported on most FastEthernet interfaces.
Review the switch configuration to verify that storm control is enabled on all host-facing interfaces as shown in the example below: interface GigabitEthernet0/3 switchport access vlan 12 storm-control unicast bps 62000000 storm-control broadcast bps 20000000 Note: Bandwidth percentage thresholds (via level parameter) can be used in lieu of PPS rate. If storm control is not enabled at a minimum for broadcast traffic, this is a finding.