7
Any of the storm-constrain, broadcast-suppression, multicast-suppression, and
unicast-suppression commands can suppress storm on a port. The broadcast-suppression,
multicast-suppression, and unicast-suppression commands suppress traffic in hardware. They
have less impact on device performance than the storm-constrain command, which performs
suppression in software.
Configuration guidelines
For the same type of traffic, do not configure the storm constrain command together with any of the
broadcast-suppression, multicast-suppression, and unicast-suppression commands.
Otherwise, the traffic suppression result is not determined. For more information about the
storm-constrain command, see "Configuring storm control on an Ethernet interface."
Whe
n 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 switch.
Configuration procedure
To set storm suppression thresholds on one or multiple Ethernet interfaces:
Step Command Remarks
1. Enter system view.
system-view
N/A
2. Enter Ethernet interface
view.
interface
interface-type
interface-number
N/A
3. Enable broadcast
suppression and set the
broadcast suppression
threshold.
broadcast-suppression
{ ratio |
pps
max-pps |
kbps
max-kbps }
By default, broadcast traffic is
allowed to pass through an
interface.
4. Enable multicast
suppression and set the
multicast suppression
threshold.
multicast-suppression
{ ratio |
pps
max-pps |
kbps
max-kbps }
By default, multicast traffic is
allowed to pass through an
interface.
5. Enable unknown unicast
suppression and set the
unknown unicast
suppression threshold.
unicast-suppression
{ ratio |
pps
max-pps |
kbps
max-kbps }
By default, unknown unicast traffic
is allowed to pass through an
interface.
Configuring storm control on an Ethernet interface
IMPORTANT:
The known unicast storm control feature is available in Release 1121 and later.
Storm control compares broadcast, multicast, unknown unicast traffic, and known unicast traffic
regularly with their respective traffic thresholds on an Ethernet interface. For each type of traffic,
storm control provides a lower threshold and a higher threshold.
For management purposes, you can configure the interface to output threshold event traps and log
messages when monitored traffic meets one of the following conditions:
• Exceeds the upper threshold.
• Falls below the lower threshold from the upper threshold.
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