xStack® DES-3200 Series Layer 2 Managed Fast Ethernet Switch
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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.
Countdown (0 or 3-30)
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.
Time Interval (5-600)
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
Threshold (0-255000)
Specifies the maximum number of packets per second that will trigger the Traffic
Control function to commence. The configurable threshold range is from 0-255000
with a default setting of 131072 packets per second.
Traffic Control Type Specifies the desired Storm Control Type: None, Broadcast, Multicast, Unknown
Unicast, Broadcast + Multicast, Broadcast + Unknown Unicast, Multicast + Unknown
Unicast, and Broadcast + Multicast + Unknown Unicast.
Traffic Trap Settings
Enable sending of Storm Trap messages when the type of action taken by the
Traffic Control function in handling a Traffic Storm is one of the following:
None – No trap state is specified.
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.
This function cannot be implemented in the hardware mode. (When Drop is chosen
for the Action parameter)
Traffic Log Settings
Use the drop-down menu to enable or disable the function. If enabled, the traffic
control states are logged when a storm occurs and when a storm is cleared. If the
log state is disabled, the traffic control events are not logged.
Traffic Auto Recover
Time (0-65535)
Enter the time allowed for auto recovery from shutdown for a port. The default value
is 0, which means there is no auto recovery and the port remains in shutdown
forever mode. This requires manual entry of the CLI command config ports
[ <portlist> | all ] state enable to return the port to a forwarding state.
Click the Apply button to accept the changes made for each individual section.
NOTE: Traffic Control cannot be implemented on ports that are set for Link Aggregation (Port
Trunking).
NOTE: Ports that are in the Shutdown Forever mode will be seen as Discarding in Spanning Tree
windows and implementations though these ports will still be forwarding BPDUs to the Switch’s
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