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DES-7200 Configuration Guide Chapter 5 Port-based Flow Control Configuration
5-1
5 Port-based Flow Control
Configuration
5.1 Storm Control
5.1.1 Overview
Too many broadcast, multicast or unknown unicast packets in the LAN will slow the
network speed and increase the possibility of packet transmission timeout significantly.
This is called LAN storm. Protocol stack implementation errors or wrong network
configuration may lead to such storms.
Storm control can be conducted upon the broadcast, multicast and unknown unicast
data streams respectively. When the rate of the broadcast, multicast or unknown
unicast packets received by the interface exceeds the specified bandwidth throttling,
the device only allows the packets within the bandwidth throttling. The packets that
exceed the throttle will be discarded until the data stream becomes normal again. This
prevents excessive flooding packets from entering the LAN to form a storm.
5.1.2 Configuring Storm Control
In the interface configuration mode, use the following command to configure storm
control:
Command Function
DES-7200(config-if)# storm-control
{broadcast | multicast | unicast}
[{ level percent | pps packets |
rate-bps]
broadcast: Enable the broadcast storm control
function.
multicast: Enable the unknown multicast storm
control function.
unicast: Enable the unknown unicast storm control
function.
percent: Set according to the bandwidth percentage,
for example, 20 means 20%
packets: Set according to the pps, which means
packets per second
Rate-bps: rate allowed