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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.  
 

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 details, refer to Port Management.  

 
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 corresponding upper threshold:  

z

 

Block: Block the port. In this case, the port is blocked and thus 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.  

z

 

Shutdown: Shut down the port. In this case, 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.  

Select Device > Storm Constrain from the navigation tree to enter the page shown in 

. In the 

 text box, input the traffic statistics generating interval for 

storm constrain.