unicast-suppression
Use unicast-suppression to enable unknown unicast storm suppression and set the unknown 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 unknown unicast traffic.
Views
Ethernet interface view
Predefined user roles
network-admin
Parameters
ratio: Sets the unknown unicast suppression threshold as a percentage of the interface bandwidth. The value range for this argument (in percentage) is 0 to 100. A smaller value means that less unknown unicast traffic is allowed to pass through.
pps max-pps: Specifies the maximum number of unknown 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 interface bandwidth. For example, the value range of the max-pps argument for a 40-GE interface is 0 to 59524000.
kbps max-kbps: Specifies the maximum number of kilobits of unknown unicast traffic that the Ethernet interface can forward per second. The value range for this argument (in kbps) is 0 to the interface bandwidth.
Usage guidelines
The unknown unicast storm suppression feature limits the size of unknown unicast traffic to a threshold on an interface. When the unknown unicast traffic on the interface exceeds this threshold, the system drops packets until the traffic drops below this threshold.
Both storm-constrain and unicast-suppression can suppress unknown unicast storm on a port. The unicast-suppression command uses the chip to physically suppress unknown unicast traffic. It has less influence on the device performance than the storm-constrain command, which uses software to suppress unknown unicast traffic.
For the traffic suppression result to be determined, do not configure both the storm constrain unicast command and the unicast-suppression command on an interface.
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.
For the suppression threshold that takes effect, see the prompt on the device.
Examples
# Set the unknown unicast storm suppression threshold to 10000 kbps on Ten-GigabitEthernet1/0/1.
<Sysname> system-view [Sysname] interface ten-gigabitethernet 1/0/1 [Sysname-Ten-GigabitEthernet1/0/1] unicast-suppression kbps 10000 The actual value is 10048 on port Ten-GigabitEthernet1/0/1 currently.
Related commands
broadcast-suppression
multicast-suppression