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Configuring storm control on an ethernet interface, About storm control, Configuration guidelines – H3C Technologies H3C S12500-X Series Switches User Manual

Page 22: Setting the statistics polling interval

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11

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

About storm control

Storm control compares broadcast, multicast, and unknown 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 exceeds the upper threshold or falls below the lower threshold from the

upper threshold.
Depending on your configuration, when a particular type of traffic exceeds its upper threshold, the
interface does either of the following:

Blocks this type of traffic, while forwarding other types of traffic—Even though the interface does
not forward the blocked traffic, it still counts the traffic. When the blocked traffic drops below the

lower threshold, the port begins to forward the traffic.

Shuts down automatically—The interface shuts down automatically and stops forwarding any
traffic. When the blocked traffic is detected dropping below the lower threshold, the port does not

forward the traffic. To bring up the interface, use the undo shutdown command or disable the storm
control function.

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, and have less impact on device
performance than the storm-constrain command, which performs suppression in software.
Storm control uses a complete polling cycle to collect traffic data, and analyzes the data in the next cycle.

An interface takes one to two polling intervals to take a storm control action.

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 broadcast-suppression,

multicast-suppression, and unicast-suppression commands, see "

Configuring storm suppression

."

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