C H A P T E R 21 Configuring Port-Based Traffic Control - Cisco Catalyst 3550 series Software Configuration Manual
Multilayer switch
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Chapter 21
Configuring Port-Based Traffic Control
You use the storm-control interface configuration commands to set the threshold value for each traffic
type.
Note
Before Cisco IOS Release 12.1(8)EA1, you set up storm control threshold values by using the
switchport broadcast, switchport multicast, and switchport unicast interface configuration
commands. These commands are now obsolete, replaced by the storm-control interface configuration
commands.
Default Storm Control Configuration
By default, unicast, broadcast, and multicast storm control is disabled on the switch: that is, the
suppression level is 100 percent (no limit is placed on the traffic).
Enabling Storm Control
You enable storm control on an interface and enter the percentage of total available bandwidth that you
want to be used by a particular type of traffic; entering 100 percent allows all 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
even though the command is available in the CLI.
Beginning in privileged EXEC mode, follow these steps to enable a particular type of storm control:
Command
Step 1
configure terminal
Step 2
interface interface-id
Step 3
storm-control broadcast level level [.level]
Step 4
storm-control multicast level level [.level]
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Purpose
Enter global configuration mode.
Specify the type and number of the physical interface to configure,
for example, gigabitethernet0/1, and enter interface configuration
mode.
Specify the broadcast traffic suppression level for an interface as a
percentage of total bandwidth. The level can be from 1 to 100; the
optional fraction of a level can be from 0 to 99. A threshold value
of 100 percent means that no limit is placed on broadcast traffic. A
value of 0.0 means that all broadcast traffic on that port is blocked.
Specify the multicast traffic suppression level for an interface as a
percentage of total bandwidth. The level can be from 1 to 100; the
optional fraction of a level can be from 0 to 99. A threshold value
of 100 percent means that no limit is placed on broadcast traffic. A
value of 0.0 means that all multicast traffic on that port is blocked.
Catalyst 3550 Multilayer Switch Software Configuration Guide
Configuring Storm Control
21-3
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