1-3Figure 1-2 Add storm constrain settings for portsTable 1-1 describes the port storm constrain configuration items.Table 1-1 Port storm constrain configuration itemsItem RemarksControl ModeSpecify the action to be performed when a type of traffic exceeds thecorresponding upper threshold. Available options include:z None: Perform no action.z Block: Block the traffic of this type on a port when the type of trafficexceeds the upper threshold.z Shutdown: Shut down the port when a type of traffic exceeds the trafficthreshold. The port stops forwarding traffic as a result.The storm constrain function, after being enabled, requires a full trafficstatistics generating interval (in seconds) to collect traffic data, and analyzesthe data in the next interval. Thus, it is normal that a period longer than onetraffic statistics generating interval is waited for a control action to happen ifyou enable the function while the packet storm is present. Nevertheless, theaction will be taken within two intervals.Broadcast ThresholdMulticast ThresholdUnicast ThresholdSet the broadcast, multicast, and unicast thresholds.z None: Perform no storm constrain for the selected port or ports.z pps: Specify the storm constrain upper threshold and lower threshold inpackets per second (pps).z On a port, you can set the thresholds for broadcast, multicast, andunicast traffic at the same time. To set storm constrain on a portsuccessfully, you must specify the thresholds for at least a type of traffic.z When the pps option is selected, the upper threshold and lower thresholdranges depend on the interface type, as shown in the pps rangedescription on the page.
