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Catalyst4500 Series SwitchCiscoIOS Command Reference—Release 12.2(18)EW
78-16201-01
Chapter2Cisco IOS Commands for the Catalyst 4500 Series Switches
storm-control
storm-control
To enable broadcast storm control on a port, and to specify what to do when a storm occurs on a port,
use the storm-control interface configuration command. Use the no form of this command to disable
storm control for broadcast traffic and disable the specified storm-control action.
storm-control {broadcast level high level [lower level]} | action {shutdown | trap}}
no storm-control {broadcast level level [lower level]} | action {shutdown | trap}}
Syntax Description
Defaults Broadcast storm control is disabled. All packets are passed.
Command Modes Interface configuration
Command History
Usage Guidelines Enter the storm-control broadcast level command to enable traffic storm control on the interface,
configure the traffic storm control level, and apply the traffic storm control level to broadcast traffic on
the interface.
The Catalyst4500 series switch supports broadcast traffic storm control on all LAN ports.
The period is required when you enter the fractional suppression level.
The suppression level is entered as a percentage of the total bandwidth. A threshold value of 100 percent
indicates that no limit is placed on traffic. A value of 0.0 means that all specified traffic on that port is
blocked.
Enter the show interfaces counters storm-control command to display the discard count.
broadcast Enables broadcast storm control on the port.
level high-level lower-level Defines the rising and falling suppression levels:
• high-level—Rising suppression level as a percent of total
bandwidth, up to two decimal places; valid values are from 0
to 100 percent. Blocks the flooding of storm packets when the
value specified for level is reached.
• lower-level—(Optional) Falling suppression level as a
percent of total bandwidth, up to two decimal places; valid
values are from 0 to 100. This value must be less than the
rising supression value.
action Directs the switch to take action when a storm occurs on a port.
shutdown Disables the port during a storm.
trap Sends an SNMP trap when a storm occurs. This keyword is
available but not supported in 12.1(19)EW.
Release Modification
12.1(19)EW Support for this command was introduced on the Catalyst 4500 series switch.
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