12For the suppression threshold that takes effect, see the prompt on the device.Configuration procedureTo set storm suppression thresholds on one or multiple Ethernet interfaces:Step Command Remarks1. Enter system view. system-view N/A2. Enter Layer 2 Ethernetinterface view.interface interface-typeinterface-number N/A3. Enable broadcast suppressionand set the broadcastsuppression threshold.broadcast-suppression { ratio |pps max-pps | kbps max-kbps }By default, broadcast traffic isallowed to pass through aninterface.4. Enable multicast suppressionand set the multicastsuppression threshold.multicast-suppression { ratio | ppsmax-pps | kbps max-kbps }By default, multicast traffic isallowed to pass through aninterface.5. Enable unknown unicastsuppression and set theunknown unicast suppressionthreshold.unicast-suppression { ratio | ppsmax-pps | kbps max-kbps }By default, unknown unicast trafficis allowed to pass through aninterface.Configuring storm control on an Ethernet interfaceStorm control compares broadcast, multicast, and unknown unicast traffic regularly with their respectivetraffic thresholds on an Ethernet interface. For each type of traffic, storm control provides a lowerthreshold and a higher threshold.For management purposes, you can configure the interface to output threshold event traps and logmessages when either of the following conditions exists:• Monitored traffic exceeds the upper threshold.• Monitored traffic falls below the lower threshold from the upper threshold.Depending on your configuration, when a particular type of traffic exceeds its upper threshold, theinterface does either of the following:• Blocks this type of traffic, while forwarding other types of traffic—Even though the interface doesnot forward the blocked traffic, it still counts the traffic. When the blocked traffic drops below thelower threshold, the port begins to forward the traffic.• Shuts down automatically—The interface shuts down automatically and stops forwarding anytraffic. When the blocked traffic is detected dropping below the lower threshold, the port does notforward the traffic. To bring up the interface, use the undo shutdown command or disable the stormcontrol feature.Any of the storm-constrain, broadcast-suppression, multicast-suppression, and unicast-suppressioncommands can suppress storm on a port. The broadcast-suppression, multicast-suppression, andunicast-suppression commands suppress traffic in hardware, and have less impact on deviceperformance than the storm-constrain command, which performs suppression in software.Storm control uses a complete polling cycle to collect traffic data, and analyzes the data in the next cycle.An interface takes one to two polling intervals to take a storm control action.
