When the Ethernet interface of the Layer 2 device receives broadcast, multicast, or unknown unicast data, the received data will be flooded according to the basic working principle of the switch. To put it simply, the device will forward these packets to other Layer 2 Ethernet interfaces in the same VLAN. This may cause a broadcast storm, and in severe cases, will damage the device. The purpose of using traffic suppression and storm control technology is to prevent these three types of packets and avoid causing network security problems.
To prevent broadcast storms caused by broadcast, multicast and unknown unicast packets from affecting the network, storm control techniques are generally adopted.
Under the interface, storm control is generally performed on broadcast, multicast, and unknown unicast packets at the packet rate. Within a detection interval, the device receives broadcast, multicast and unknown unicast data, and compares the average rate of these data with the configured maximum threshold. When the packet rate is greater than the configured maximum threshold, the device will respond to The interface performs storm control, and the configured storm control action is executed to shut down the interface. If the interface is shut down, you need to manually execute the command to turn on the interface, or enable the interface status to automatically restore to the UP function.
Next, a brief description of the storm control configuration, but it should be noted that before configuring storm control, you must ensure that the link state of the interface is in the double up state.
1. Enter the corresponding interface first
Run the command interface interface-type interface-number //Enter the interface
2. Configure storm control on the broadcast, multicast or unicast packets on the interface and set the maximum and minimum rates
Run the storm control {broadcast | multicast | unicast | unknown-unicast} minrate percent min-rate-value max-rate percent max-rate-value or
storm control {broadcast | multicast | unicast | unknown-unicast} min-rate kbps min-rate-value max-rate kbps max-rate-value or
storm control {broadcast | multicast | unicast | unknown-unicast} min-rate min-rate-value max-rate max-rate-value
3. Configure actions for storm control
Execute command storm control action {error-down | block}
Error-Down means that the device sets the interface status to ERROR DOWN after detecting a fault. At this time, the interface cannot send and receive packets, and the interface indicator is off.
4. Log information (optional)
Run the storm control enable {log | trap} command to enable logging or reporting alarms during storm control.
5. Configure the detection time (optional)
Run the storm control interval interval-value command to configure the storm control detection interval.
6. Configuration detection
Run the display storm control [interface interface-type interface-number [verbose]] command to view storm control information on the interface.
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