3com S7906E Manuel De Montage

 

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The optical port of an SFP or XFP port does not support this feature. The support of other Ethernet 

ports for this feature depends on the device model. 

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A link in the up state goes down and then up automatically if you perform the operation described in 

this section on one of the Ethernet ports forming the link. 

 

Follow these steps to test the current operating state of the cable connected to an Ethernet port: 

Enter system view 

— 

Enter Ethernet port view 

interface interface-type 
interface-number 

— 

Test the cable connected to the 
Ethernet port once 

Required 

 

The storm constrain function suppresses packet storms in an Ethernet. With this function enabled on a 

port, the system detects the unicast traffic, multicast traffic, or broadcast traffic passing through the port 

periodically and takes corresponding actions (that is, blocking or shutting down the port and sending 

trap messages and logs) when the traffic detected exceeds the threshold. 

 

Alternatively, you can configure the storm suppression function to control a specific type of traffic. As 

the function and the storm constrain function are mutually exclusive, do not enable them at the same 

time on an Ethernet port. For example, with unicast storm suppression ratio set on an Ethernet port, do 

not enable the storm constrain function for unicast traffic on the port. Refer to

  Configuring Storm 

 for information about the storm suppression function. 

 

With the storm constrain function enabled on an Ethernet port, you can specify the system to act as 

follows when the traffic detected exceeds the threshold. 

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Blocking the port. In this case, the port is blocked and thus stops forwarding the traffic of this type 

till the traffic detected is lower than the threshold. Note that a port blocked by the storm constrain 

function can still forward other types of traffic and monitor the blocked traffic. 

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Shutting down the port. In this case, the port is shut down and stops forwarding all types of traffic. 

Ports shut down by the storm constrain function can only be brought up by using the undo 

shutdown command or disabling the storm constrain function.