D-Link DGS-1510 Series - Page 601

DGS-1510 Series Gigabit Ethernet SmartPro Switch CLI Reference Guide
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unicast
Specifies to set the unicast rate limit. When the action is configured
as the shutdown mode, the unicast refers to both known and
unknown unicast packets; that is, if the known and unknown unicast
packets hit the specified threshold, the port will be shutdown.
Otherwise, unicast refers to unknown unicast packets.
level pps PPS-RISE [PPS-
LOW]
Specifies the threshold value in packets count per second. The
range is from 0 to 2147483647. If the low PPS value is not
specified, the default value is 80% of the specified risen PPS.
level kbps KBPS-RISE
[KBPS-LOW]
Specifies the threshold value as a rate of bits per second at which
traffic is received on the port. The range is from 0 to 2147483647. If
the low KBPS is not specified, the default value is 80% of the
specified risen KBPS.
level LEVEL-RISE [LEVEL-
LOW]
Specifies the threshold value as a percentage of the total bandwidth
per port at which traffic is received on the port. The range is from 0
to 100. If the low level is not specified, the default value is 80% of
the specified risen level.
action shutdown
Specifies to shut down the port when the value specified for rise
threshold is reached.
action drop
Specifies to discards packets that exceed the risen threshold.
action none
Specifies not to filter the storm packets.
Default
By default, the broadcast, multicast, and unicast (DLF) storm controls are disabled.
The default action taken when a storm occurs is to drop storm packets.
Command Mode
Interface Configuration Mode.
Command Default Level
Level: 12.
Usage Guideline
Use the storm control function to protect the network from the storm of broadcast packets, multicast
packets, or unknown DA flooding packets. Enter the storm-control command to enable storm control
for a specific traffic type on the interface.
There are two ways to recover an error disabled port.
 The user can use the errdisable recovery cause command to enable the automatic recovery of
ports that were error disabled by storm control.
 The user can manually recover the port by entering the shutdown command, followed by the no
shutdown command for the port.
There is only one meter mode (percentage, kbps or pps) that can take effect on an interface. On an
interface, if the later specified meter mode option is different from the previous mode, the previous
configured storms will reset to their default states (disabled in this specification).
Due to hardware limitations, when the meter mode is percentage or kbps:
 The action cannot be specified to the shutdown mode.
 There are no traps and logs for the drop and none modes.
This feature is unable to give the precise suppression level of the total bandwidth in percentage (0 to
100) of a specific port interface. The current calculation formula assumes that the packet size is 64
bytes.
Example
This example shows how to enable broadcast storm control on eth3/0/1 and eth3/0/2. It sets the
threshold of eth3/0/1 to 500 packets per second with the shutdown action and sets the threshold of
the interface port 3.2 to 70% with the drop action.