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CLI-based Configuration Guide - Security

AR500, AR510, AR531, AR550, AR1500, and AR2500 V200R010

This document provides the basic concepts, configuration procedures, and configuration examples in different application scenarios of the network management feature supported by the device.
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Storm Control

Storm Control

Storm control prevents broadcast storms caused by broadcast packets, multicast packets, and unknown unicast packets.

In a detection interval, a router with storm control configured monitors the average rates of incoming packets on an interface and compares the average rates with the thresholds. When the rate of a particular type of packets exceeds the threshold allowed for these packets, the router takes a storm control action on the interface.

Storm control actions include block and shutdown. An interface that is blocked or shut down can be recovered in the following ways:
  • When the average rates of incoming packets on a blocked interface fall below the lower thresholds, the interface is unblocked to forward packets.
  • If the action is shutdown, manually unblock the interface or enable the interface to automatically recover to the Up state.

When detecting unicast packets, a switch does not distinguish unknown unicast packets from known unicast packets. The packet rate detected is the average of the rates of unknown and known unicast packets. When the storm control action is block, the device blocks only the unknown unicast packets. This rule also applies to multicast packets.

Updated: 2019-08-09

Document ID: EDOC1100034236

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