Storm-Control - Cisco Catalyst 3750 Command Reference Manual

Chapter 2 Catalyst 3750 Switch Cisco IOS Commands

storm-control

Use the storm-control interface configuration command on the switch stack or on a standalone switch 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(11)AX
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 command-line interface (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.
When the storm control threshold for multicast traffic is reached, all multicast traffic except control
traffic, such as bridge protocol data unit (BDPU) and Cisco Discovery Protocol (CDP) frames, are
blocked. However, the switch does not differentiate between routing updates, such as Open Shortest Path
First (OSPF) and regular multicast data traffic, so both types of traffic are blocked.
Note For more information about storm control suppression levels, refer to the software configuration guide
for this release.
78-16181-01
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. The range is 0 to
100 percent.
(Optional) Fractional storm-control suppression level. The range is 0 to 99.
Modification
This command was introduced.
Catalyst 3750 Switch Command Reference
storm-control
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