36 Port-Based Flow Control
Configuration
36.1 Storm Control
36.1.1 Overview
Excessive broadcast, multicast or unicast packets with unknown names in LAN will result in
slow network speed and considerably increased possibility of packet transmission timeout.
This is called LAN storm. Protocol stack implementation errors or wrong network
configuration may also lead to such storms.
Storm control can be conducted to broadcast, multicast and unknown unicast data flows
respectively.When the rate of the broadcast, multicast or unicast packets with unknown
names received by the interface exceeds the specified threshold, the device only allows the
packets within the bandwidth threshold. The packets that exceed the threshold will be
discarded until the data flow becomes normal again. This prevents excessive flood packets
from entering the LAN to for a storm.
36.1.2 Configuring Storm Control
By default, the storm control function for broadcast, multicast and unknown unicast packets
is disabled.
When the user sets a bandwidth for an interface by percentage, this percentage applies to all
the ports and any other settings will not take effect.
In the interface configuration mode, execute the following command to configure storm
control:
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