Chapter 13
| Congestion Control Commands
Storm Control Commands
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Storm Control Commands
Storm control commands can be used to configure broadcast, multicast, and
unknown unicast storm control thresholds. Traffic storms may occur when a device
on your network is malfunctioning, or if application programs are not well
designed or properly configured. If there is too much traffic on your network,
performance can be severely degraded or everything can come to complete halt.
You can protect your network from traffic storms by setting a threshold for
broadcast, multicast or unknown unicast traffic. Any packets exceeding the
specified threshold will then be dropped.
switchport
packet-rate
This command configures broadcast, multicast and unknown unicast storm
control. Use the no form to restore the default setting.
Syntax
switchport {broadcast | multicast | unknown-unicast} packet-rate rate
no switchport {broadcast | multicast | unicast}
broadcast - Specifies storm control for broadcast traffic.
multicast - Specifies storm control for multicast traffic.
unknown-unicast - Specifies storm control for unknown unicast traffic.
rate - Threshold level as a rate; i.e., packets per second.
(Range: 500-59520000 pps)
Default Setting
Broadcast Storm Control: Enabled, 500 pps
Multicast Storm Control: Disabled
Unknown Unicast Storm Control: Disabled
Command Mode
Interface Configuration (Ethernet, Port Channel)
Command Usage
â—† When traffic exceeds the threshold specified for broadcast and multicast or
unknown unicast traffic, packets exceeding the threshold are dropped until the
rate falls back down beneath the threshold.
Table 82: Rate Limit Commands
Command Function Mode
switchport packet-rate Configures broadcast, multicast, and unknown
unicast storm control thresholds
IC
show interfaces
switchport
Displays the administrative and operational status
of an interface
NE, PE
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