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3. Set the storm constraint function as described in Table 19.
4. Click Apply.
Table 19 Configuration items
Item Remarks
Control Mode
Specify the action to be performed when a type of traffic exceeds the upper
threshold. Available options include:
• None—Performs no action.
• Block—Blocks the traffic of this type on a port when the type of traffic exceeds the
upper threshold.
• Shutdown—Shuts down the port when a type of traffic exceeds the traffic
threshold. The port stops forwarding traffic as a result.
After being enabled, the storm constrain function requires a full traffic statistics
generating interval (in seconds) to collect traffic data. It analyzes the data in the next
interval. If you enable the function when the packet storm is present, it is normal that a
period longer than one traffic statistics generating interval is required for a control
action to happen. Nevertheless, the action will be taken within two intervals.
Broadcast Threshold
Set the broadcast, multicast, and unknown unicast thresholds:
• None—Performs no storm constrain for the selected port or ports.
• pps—Specifies the storm constrain upper threshold and lower threshold in pps.
• ratio—Specifies the storm constrain upper threshold and lower threshold in
percentage of received packets to the transmission capability of each selected
port.
• kbps—Specifies the storm constrain upper threshold and lower threshold in kbps.
IMPORTANT:
• On a port, you can set the thresholds for broadcast, multicast, and unknown
unicast traffic at the same time. To set storm constrain on a port successfully, you
must specify the thresholds for at least a type of traffic.
• When you select the pps option, the upper threshold and lower threshold ranges
depend on the interface type, as shown in the pps range description on the page.
Multicast Threshold
Unicast Threshold
Trap
Select or clear the box to enable or disable the system to send trap messages both
when an upper threshold is crossed and when the lower threshold is crossed after
that.
Log
Select or clear the box to enable or disable the system to output logs both when an
upper threshold is crossed and when the lower threshold is crossed after that.
Select ports
Select ports from the chassis front panel to apply the storm constrain settings to them.
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