H3C Technologies H3C WX3000E Series Wireless Switches - Manual (Page 89)

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Storm constrain configuration
Overview
The storm constrain function limits traffic of a port within a predefined upper threshold to suppress packet
storms in an Ethernet. With this function enabled on a port, the system detects the amount of broadcast
traffic, multicast traffic, and unicast traffic reaching the port periodically. When a type of traffic exceeds
the threshold for it, the function, as configured, blocks or shuts down the port, and optionally, sends trap
messages and logs.
CAUTION:
Alternatively, you can configure the storm suppression function to control a specific type of traffic. As the
storm suppression function and the storm constrain function are mutually exclusive, do not enable them at
the same time on an Ethernet port. For example, with broadcast storm suppression enabled on a port, do
not enable storm constrain for broadcast traffic on the port. The storm suppression function is configured
in Device > Port Management. For more information, see the chapter "
Port management configuration ."
With storm constrain enabled on a port, you can specify the system to act as follows when a certain type
of traffic (broadcast, multicast, or unicast) exceeds the upper threshold:
• Block: Blocks the port. The port is blocked and stops forwarding the traffic of this type until the type
of traffic drops down below the lower threshold. Note that a port blocked by the storm constrain
function can still forward other types of traffic and collect statistics for the blocked traffic.
• Shutdown: Shuts down the port. The port is shut down and stops forwarding all types of traffic. To
bring up the port, select Device > Port Management to configure the port, or cancel the storm
constrain setting on the port.
Configuring storm constrain
Setting the traffic statistics generating interval
NOTE:
•
The traffic statistics generating interval set here is the interval used by the storm constrain function for
measuring traffic against the traffic thresholds. It is different from the interval set in the flow interval
module, which is used for measuring the average traffic sending and receiving rates over a specific
interval.
• For network stability sake, set the traffic statistics generating interval for the storm constrain function to
the default or a greater value.
1. Select Device > Storm Constrain from the navigation tree to enter the page shown in Figure 60 .
2. In the Interval for generating traffic statistics field, enter the traffic statistics generating interval for
storm constrain.
3. Click Apply.