D-Link xStack DGS-3120 Series Reference Manual page 271

xStack® DGS-3120 Series Layer 3 Managed Gigabit Ethernet Switch Web UI Reference Guide
The fields that can be configured are described below:
Parameter
Unit
From Port / To Port
Action
Countdown (0 or 3-30)
Time Interval (5-600)
Figure 6-6 Traffic Control Settings window
Description
Select the unit you want to configure. (EI and SI Mode Only)
Use the drop-down menu to select the port range to use for this configuration.
Select the method of traffic control from the drop-down menu. The choices are:
Drop – Utilizes the hardware Traffic Control mechanism, which means the Switch's
hardware will determine the Packet Storm based on the Threshold value stated and
drop packets until the issue is resolved.
Shutdown – Utilizes the Switch's software Traffic Control mechanism to determine
the Packet Storm occurring. Once detected, the port will deny all incoming traffic to
the port except STP BPDU packets, which are essential in keeping the Spanning
Tree operational on the Switch. If the Count Down timer has expired and yet the
Packet Storm continues, the port will be placed in Shutdown Forever mode and is
no longer operational until the port recovers after 5 minutes automatically or the
user manually resets the port using the Port Settings window (Configuration>
Port Configuration> Port Settings). Choosing this option obligates the user to
configure the Time Interval setting as well, which will provide packet count
samplings from the Switch's chip to determine if a Packet Storm is occurring.
The Count Down timer is set to determine the amount of time, in minutes, that the
Switch will wait before shutting down the port that is experiencing a traffic storm.
This parameter is only useful for ports configured as Shutdown in their Action field
and therefore will not operate for hardware-based Traffic Control implementations.
The possible time settings for this field are 0 and 3 to 30 minutes. To disable this
feature select the Disable option.
The Time Interval will set the time between Multicast and Broadcast packet counts
sent from the Switch's chip to the Traffic Control function. These packet counts are
the determining factor in deciding when incoming packets exceed the Threshold
value. The Time Interval may be set between 5 and 600 seconds, with a default
setting of 5 seconds.
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