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21-3
Catalyst 2960 Switch Software Configuration Guide
78-16881-01
Chapter 21 Configuring Port-Based Traffic Control
Configuring Storm Control
Default Storm Control Configuration
By default, unicast, broadcast, and multicast storm control are disabled on the switch interfaces; that is,
the suppression level is 100 percent.
Configuring Storm Control and Threshold Levels
You configure storm control on a port and enter the threshold level that you want to be used for a
particular type of traffic.
However, because of hardware limitations and the way in which packets of different sizes are counted,
threshold percentages are approximations. Depending on the sizes of the packets making up the
incoming traffic, the actual enforced threshold might differ from the configured level by several
percentage points.
Note Storm control is supported only on physical interfaces. It is not supported on EtherChannel port-channels
or physical interfaces that are members of port channels even though the command is available in the
CLI. If a physical interface with storm control configured joins an EtherChannel, the storm control
configuration for the physical interface is removed from the running configuration.
Beginning in privileged EXEC mode, follow these steps to storm control and threshold levels:
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
interface interface-id Specify the interface to be configured, and enter interface
configuration mode.