D-Link Xstack DES-3528 Series Reference Manual page 171

xStack® DES-3528/DES-3552 Series Layer 2 Managed Stackable Fast Ethernet Switch Web UI Reference Guide
The fields that can be configured are described below:
Parameter
Unit
From Port / To Port
Action
Count Down (0 or 3-30)
Figure 6-6 Traffic Control Settings window
Description
Select the unit to configure.
Use the drop-down menu to select the port range to use for this configuration.
Select the method of traffic control from the pull-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. Entering 0 means never
go into Shutdown mode. Tick the Disabled check box to go into Shutdown mode
immediately.
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