R21xx-HP FlexFabric 11900 Layer 2 LAN Switching Command Reference

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Usage guidelines
The interval set by the storm-constrain interval command is specific to storm control. To set the statistics
polling interval of an interface, use the flow-interval command.
For network stability, use the default or a higher polling interval.
Examples
# Set the traffic statistics polling interval of the storm control module to 60 seconds.
<Sysname> system-view
[Sysname] storm-constrain interval 60
Related commands
• storm-constrain
• storm-constrain control
unicast-suppression
Use unicast-suppression to enable unicast storm suppression and set the unicast storm suppression
threshold.
Use undo unicast-suppression to restore the default.
Syntax
unicast-suppression { ratio | pps max-pps | kbps max-kbps }
undo unicast-suppression
Default
Ethernet interfaces do not suppress unicast traffic.
Views
Layer 2 Ethernet interface view
Predefined user roles
network-admin
Parameters
ratio: Sets the unicast suppression threshold as a percentage of the maximum interface rate. This
argument (in percentage) is in the range of 0 to 100. The smaller the percentage, the less unicast traffic
is allowed to pass through.
pps max-pps: Specifies the maximum number of unicast packets that the interface can forward per
second. The max-pps argument (in pps) is in the range of 1 to 1.4881 × the maximum interface rate. For
example, this argument is in the range of 1 to 1488100 on a GE interface and 1 to 59524000 on a
40-GE interface.
kbps max-kbps: Specifies the maximum number of kilobits of unicast traffic that the Ethernet interface can
forward per second. This argument (in kbps) is in the range of 1 to the maximum interface rate.
Usage guidelines
You can use the unicast storm suppression function to limit the size of unicast traffic on an interface. When
the unicast traffic on the interface exceeds this threshold, the system discards packets until the unicast
traffic drops below this threshold.