How To Configure Storm Control; Configuring Storm Control And Threshold Levels - Cisco Catalyst 2960-X Security Configuration Manual

How to Configure Storm Control

and T5. At the next time interval (for example, T3), if broadcast traffic does not exceed the threshold, it is
again forwarded.
The combination of the storm-control suppression level and the 1-second time interval controls the way the
storm control algorithm works. A higher threshold allows more packets to pass through. A threshold value
of 100 percent means that no limit is placed on the traffic. A value of 0.0 means that all broadcast, multicast,
or unicast traffic on that port is blocked.
Note Because packets do not arrive at uniform intervals, the 1-second time interval during which traffic activity
is measured can affect the behavior of storm control.
You use the storm-control interface configuration commands to set the threshold value for each traffic type.
How to Configure Storm Control

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.
Storm control is supported on physical interfaces. You can also configure storm control on an EtherChannel.
Note
When storm control is configured on an EtherChannel, the storm control settings propagate to the
EtherChannel physical interfaces.
Follow these steps to storm control and threshold levels:
Before You Begin
Storm control is supported on physical interfaces. You can also configure storm control on an EtherChannel.
When storm control is configured on an EtherChannel, the storm control settings propagate to the EtherChannel
physical interfaces.
Catalyst 2960-X Switch Security Configuration Guide, Cisco IOS Release 15.0(2)EX
392
Configuring Port-Based Traffic Control
OL-29048-01