R211x-HP Flexfabric 11900 Layer 2 - LAN Switching Command Reference

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multicast-suppression
Use multicast-suppression to enable multicast storm suppression and set the multicast storm suppression
threshold.
Use undo multicast-suppression to restore the default.
Syntax
multicast-suppression { ratio | pps max-pps | kbps max-kbps }
undo multicast-suppression
Default
Ethernet interfaces do not suppress multicast traffic.
Views
Layer 2 Ethernet interface view
Predefined user roles
network-admin
mdc-admin
Parameters
ratio: Sets the multicast 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 multicast traffic
is allowed to pass through.
pps max-pps: Specifies the maximum number of multicast 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 this 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 multicast 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 multicast storm suppression function to limit the size of multicast traffic on an interface.
When the multicast traffic on the interface exceeds this threshold, the system drops packets until the traffic
drops below this threshold.
Both the storm-constrain and multicast-suppression can suppress multicast storm on a port. The
storm-constrain command uses software to suppress traffic, and it affects the device performance to a
certain extent. The multicast-suppression command uses the chip to physically suppress multicast traffic,
and it has less influence on the device performance than the storm-constrain command. Do not configure
the storm constrain command and the multicast-suppression command at the same time. Otherwise, the
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.