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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. The
value range for this argument (in percentage) is 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 value range for the max-pps argument (in pps) is 0 to 1.4881 × the maximum interface
rate. For example, the value range for the argument is 0 to 1488100 on a GE interface and 0 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. The value range for this argument (in kbps) is 0 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.
Both the storm-constrain and unicast-suppression can suppress unicast storm on a port.
•
The storm-constrain command uses software to suppress unicast traffic, and it affects the
device performance to a certain extent.
•
The unicast-suppression command use the chip to physically suppress unicast traffic, and it
has less influence on the device performance than the storm-constrain command.
Do not configure the storm constrain command and the unicast-suppression command at the
same time. Otherwise, the unicast traffic suppression result is not determined.
When you configure the suppression threshold in kbps, the actual suppression threshold might be
different from the configured one as follows:
•
If the configured value is smaller than 64, the value of 64 takes effect.
•
If the configured value is greater than 64 but not an integer multiple of 64, the integer multiple of
64 that is greater than and closest to the configured value takes effect.
To determine the suppression threshold that takes effect, see the prompts on the device.
Examples
# Set the unicast storm suppression threshold to 10000 kbps on GigabitEthernet 1/0/1.
<Sysname> system-view
[Sysname] interface gigabitethernet 1/0/1
[Sysname-GigabitEthernet1/0/1] unicast-suppression kbps 10000
The actual value is 10048 on port GigabitEthernet1/0/1 currently.
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