PLANET WGSW-52040 - Manual (Page 154)

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4.1.16 storm-control
Command：
storm control {unicast | broadcast | multicast} {kbps <Kbits> | pps <PPS>}
no strom control {unicast | broadcast | multicast}
Function:
Sets the traffic limit for broadcasts, multicasts and unknown destination unicasts on all ports in the switch; the no
command disables this traffic suppression function on all ports in the switch, i.e., enables broadcasts, multicasts and
unknown destination unicasts to pass through the switch at line speed.
Parameters:
use unicast to limit unicast traffic for unknown destination; multicast to limit multicast traffic; broadcast to limit
broadcast traffic. <Kbits> means the number of packets allowed to pass per second, the ranging from 1 to 1000000.
<PPS> means number of the allowing packets per second, the range is 1 to 1488095.
Command mode:
Port Mode.
Default:
No limit is set by default. So, broadcasts, multicasts and unknown destination unicasts are allowed to pass at line
speed.
Usage Guide:
All ports in the switch belong to a same broadcast domain if no VLAN has been set. The switch will send the above
mentioned three traffics to all ports in the broadcast domain, which may result in broadcast storm and so may greatly
degrade the switch performance. Enabling Broadcast Storm Control can better protect the switch from broadcast
storm. Note the difference of this command in 10Gb ports and other ports. If the allowed traffic is set to 1000kbps,
this means allow 1000 kbit per second and suppress the rest. This switch supports two ways for speed limit, they are
speed limit through bandwidth (kbps) and through packets number (pps). Users can choose one of them and cannot
configure these two ways at the same time.
Broadcast suppression is similar to bandwidth control. There is granularity limitation for the chip; When it limits the
speed by kbps, the granularity of the switch is 64kbps. If the <Kbits> of users' inputting is not the integer multiple of
64, the system will adjust it to be the integer multiple of 64 automatically and print the real number for users.
For broadcast suppression, broadcast, multicast, unicast must be set the same threshold value.