H3C Technologies H3C S5120 Series Switches - Manual (Page 88)

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As for an Ethernet port belongs to a port group, if you set a storm suppression ratio for the interface in
both Ethernet port view and port group view, the one configured the last takes effect.
Configuring the Storm Constrain Function on an Ethernet Port
The storm constrain function suppresses packet storms in an Ethernet. With this function enabled on an
interface, the system detects the unicast traffic, multicast traffic, or broadcast traffic passing through the
interface periodically and takes corresponding actions (that is, blocking or shutting down the interface
and sending trap messages and logs) when the traffic detected exceeds the threshold.
Alternatively, you can configure the storm suppression function to control a specific type of traffic. As
the function and the storm constrain function are mutually exclusive, do not enable them at the same
time on an Ethernet port. For example, with unicast storm suppression ratio set on an Ethernet port, do
not enable the storm constrain function for unicast traffic on the interface. Refer to Configuring Storm
Suppression .
With the storm constrain function enabled on an Ethernet port, you can specify the system to act as
follows when the traffic detected exceeds the threshold.
z Blocking the interface. In this case, the interface is blocked and thus stops forwarding the traffic of
this type till the traffic detected is lower than the threshold. Note that an interface blocked by the
storm constrain function can still forward other types of traffic and monitor the blocked traffic.
z Shutting down the interface. In this case, the interface is shut down and stops forwarding all types
of traffic. Interfaces shut down by the storm constrain function can only be brought up by using the
undo shutdown command or disabling the storm constrain function.
Follow these steps to configure the storm constrain function on an Ethernet port:
To do… Use the command… Remarks
Enter system view system-view —
Set the interval for generating
traffic statistics storm-constrain interval
seconds Optional
10 seconds by default
Enter Ethernet port view
interface interface-type
interface-number
—
Enable the storm constrain
function and set the lower
threshold and the upper
threshold storm-constrain { broadcast |
multicast | unicast } pps
max-pps-values
min-pps-values
Required
Disabled by default
Set the action to be taken when
the traffic exceeds the upper
threshold
storm-constrain control
{ block | shutdown } Optional
Disabled by default