1-8To do… Use the command… RemarksSpecify to send trap messageswhen the traffic detectedexceeds the upper threshold ordrops down below the lowerthreshold from a point higherthan the upper thresholdstorm-constrain enable trapOptionalBy default, the system sendstrap messages when the trafficdetected exceeds the upperthreshold or drops down belowthe lower threshold from a pointhigher than the upperthreshold.Specify to send log when thetraffic detected exceeds theupper threshold or drops downbelow the lower threshold froma point higher than the upperthresholdstorm-constrain enable logOptionalBy default, the system sendslog when the traffic detectedexceeds the upper threshold ordrops down below the lowerthreshold from a point higherthan the upper threshold.z For network stability sake, configure the interval for generating traffic statistics to a value that is notshorter than the default.z The storm constrain function, after being enabled, requires a complete statistical period (specifiedby the storm-constrain interval command) to collect traffic data, and analyzes the data in the nextperiod. Thus, it is normal that a period longer than one statistic period is waited for a control actionto happen if you enable the function while the packet storm is present. However, the action will betaken within two periods.z The storm constrain function is applicable to unicast packets, multicast packets, and broadcastpackets; and you can specify the upper and lower threshold for any of the three types of packets.Setting the Interval for Collecting Ethernet Port StatisticsYou can use the reset counters interface command to clear interface statistics.Follow these steps to configure the interval for collecting interface statistics:To do… Use the command… RemarksEnter system view system-view —Enter Ethernet port view interface interface-typeinterface-number —Configure the interval forcollecting interface statistics flow-interval intervalOptionalThe default interval forcollecting interface statistics is300 seconds.
