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Configuring storm constrain
Overview
The storm constrain function suppresses packet storms in an Ethernet. This function compares broadcast,
multicast, and unknown unicast traffic regularly with their respective traffic thresholds on an Ethernet port.
For each type of traffic, storm constrain provides a lower threshold and a higher threshold.
For management purposes, you can configure the port 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 port
does either of the following:
• Block this type of traffic, while forwarding other types of traffic—Even though the port 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 port shuts down automatically and stops forwarding all types of
traffic. The port cannot automatically restore even when the blocked traffic drops down below the
lower threshold. To bring up the port, select Device > Port Management to configure the port (see
"Managing ports")
, or cancel the storm constrain setting on the port.
Alternatively, you can configure the storm suppression function to control a specific type of traffic. For
more information about the storm suppression function, see "Managing ports."
Do not ena
ble storm constrain and storm suppression at the same time on an Ethernet port. Otherwise,
the traffic suppression result is not determined. For example, with unknown unicast storm suppression
enabled on a port, do not enable storm constrain for unknown unicast traffic on the port.
Setting the traffic statistics generating interval
1. Select Device > Storm Constrain from the navigation tree to enter the storm constrain configuration
page.
2. In the Interval for generating traffic statistics field, enter the traffic statistics generating interval for
storm constrain.
3. Click Apply.
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