cast address storm control multicast Multicast address storm control unicast Unicast address storm control Storm control is available only on physical interfaces. While the com- mands are available on EtherChannel (port-channel) interfaces, they are ignored if configured. Storm control has changed over the past few versions of IOS. Originally, the commands to implement this feature were switchport broadcast, switchport multicast, and switchport unicast. Older IOS versions and 3550 switches may still use these commands. Chapter 19: Catalyst 3750 Features Additionally, the latest releases of IOS allow for some newer features. One such feature provides the ability to send an SNMP trap instead of shutting down the port. You can configure this with the storm-control action interface command: 3750(config-if)#storm-control action ? shutdown Shutdown this interface if a storm occurs Send SNMP trap if a storm occurs Also, originally you could set thresholds only as percentages of the overall available bandwidth. Now, you have the option of configuring percentages, actual bits per sec- ond, or packets per second. Each storm-control type (broadcast, multicast, and unicast) can be configured with any of these threshold types: 3750(config-if)#storm-control broadcast level ? <0.00 - 100.00> Enter rising threshold Enter suppression level in bits per second Enter suppression level in packets per second A threshold (any type) of 0 indicates that no traffic of the configured type is allowed. A percentage threshold of 100 indicates that the con- figured type should never be blocked. When configuring bits-per-second or packets-per-second thresholds, you can specify a value either alone or with a metric suffix. The suffixes allowed are k, m, and g, for kilo, mega, and giga, respectively: 750(config-if)#storm-control broadcast level bps ? <0.0 - 10000000000.0> Enter rising threshold Another new feature lets you specify a rising threshold and a falling threshold. When the rising threshold is passed, the configured type of packets will 