D-Link DES-3028 User Manual page 148

DES-3028 DES-3028P DES-3052 DES-3052P Layer 2 Fast Ethernet Managed Switch
If this field times out and the packet storm continues, the port will be placed in a Shutdown Forever mode which will produce a
warning message to be sent to the Trap Receiver. Once in Shutdown Forever mode, the only method of recovering this port is to
manually recoup it using the Port Configuration window in the Administration folder and selecting the disabled port and
returning it to an Enabled status. To utilize this method of Storm Control, choose the Shutdown option of the Action field in the
window below. To view this window to configure Traffic Control, click Security > Traffic Control.
The user may set the following parameters:
Parameter Description
From... To Select the ports to be recovered.
Enable sending of Storm Trap messages when the type of action taken by the Traffic Control
Traffic Trap
function in handling a Traffic Storm is one of the following:
This function cannot be implemented in the Hardware mode. (When Drop is chosen in the
Action field.
From...To Select the ports of this Switch to configure for Storm Control.
Broadcast Enables or disable Broadcast Storm Control.
Multicast Enables or disables Multicast Storm Control.
DLF Enables or disables Destination Lookup Failure (DLF) storm control. (Not available for Software
based Traffic Control {Shutdown}).
Threshold Specifies the maximum number of packets per second that will trigger the Traffic Control function
to commence.
Action 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.
Shut Down – 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
Countdown 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 user manually resets the port using
the Storm Control Recover setting at the top of this window. Choosing this option obligates the
user to configure the Interval setting as well, which will provide packet count samplings from the
Switch's chip to determine if a Packet Storm is occurring.
Count Down 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, 5-30
minutes. 0 denotes that the port will never shutdown.
Interval The 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 Interval may be set between 5
Traffic Control Recover
Traffic Trap Configuration
None – Will send no Storm trap warning messages regardless of action taken by the
•
Traffic Control mechanism.
Storm Occurred – Will send Storm Trap warning messages upon the occurrence of
•
a Traffic Storm only.
Storm Cleared – Will send Storm Trap messages when a Traffic Storm has been
•
cleared by the Switch only.
Both – Will send Storm Trap messages when a Traffic Storm has been both
•
detected and cleared by the Switch.
Traffic Control Settings
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