Storm-Control - Cisco Catalyst 3550 Command Reference Manual
Multilayer switch
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Chapter 2 Cisco IOS Commands
storm-control
Use the storm-control interface configuration command to enable broadcast, multicast, or unicast storm
control on an interface with the specified threshold level. Use the no form of this command to disable
broadcast, multicast, or unicast storm control on an interface.
Syntax Description
broadcast
multicast
unicast
level
.level
Defaults
Broadcast, multicast, and unicast storm control are disabled.
Command Modes
Interface configuration
Command History
Release
12.1(8)EA1
Usage Guidelines
Storm control is supported only on physical interfaces; it is not supported on EtherChannel port
channels, even though it is available in the CLI.
Storm-control suppression level is entered as a percentage of total bandwidth. A threshold value of 100
percent means that no limit is placed on the specified traffic type. A value of 0.0 means that all broadcast,
multicast, or unicast traffic on that port is blocked.
If a multicast storm control suppression level is exceeded on a switch, all traffic (multicast, unicast, and
broadcast) is blocked until the multicast traffic rate drops below the threshold. Only Spanning Tree
Protocol (STP) packets are passed. If broadcast or unicast storm control suppression level is exceeded,
only that type of traffic is blocked until the rate drops below the threshold.
Note
For more information about storm control suppression levels, refer to the software configuration guide
for this release.
78-11195-09
storm-control {broadcast | multicast | unicast} level level [.level]
no storm-control {broadcast | multicast | unicast} level
Enable broadcast storm control on the interface.
Enable multicast storm control on the interface.
Enable unicast storm control on the interface.
Storm-control suppression level as a percent of total bandwidth; valid values are
from 0 to 100 percent.
(Optional) Fractional storm-control suppression level; valid values are from 0 to 99.
Modification
This command was first introduced. It replaces the switchport broadcast,
switchport multicast, and switchport unicast interface configuration
commands.
Catalyst 3550 Multilayer Switch Command Reference
storm-control
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