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xStack DGS-3600 Series Layer 3 Gigabit Ethernet Managed Switch CLI Manual
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BROADCAST STORM CONTROL COMMANDS
On a computer network, packets such as Multicast packets and Broadcast packets continually flood the network as normal procedure.
At times, this traffic may increase do to a malicious endstation on the network or a malfunctioning device, such as a faulty network
card. Thus, switch throughput problems will arise and consequently affect the overall performance of the switch network. To help
rectify this packet storm, the Switch will monitor and control the situation.
The packet storm is monitored to determine if too many packets are flooding the network, based on the threshold level provided by
the user. Once a packet storm has been detected, the Switch will drop packets coming into the Switch until the storm has subsided.
This method can be utilized by selecting the Drop option of the Action field in the window below. The Switch will also scan and
monitor packets coming into the Switch by monitoring the Switch’s chip counter. This method is only viable for Broadcast and
Multicast storms because the chip only has counters for these two types of packets. Once a storm has been detected (that is, once the
packet threshold set below has been exceeded), the Switch will shutdown the port to all incoming traffic with the exception of STP
BPDU packets, for a time period specified using the CountDown field. 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.
The broadcast storm control commands in the Command Line Interface (CLI) are listed (along with the appropriate parameters) in the
following table.
Command Parameters
config traffic control [<portlist> | all] {broadcast [enable | disable] | multicast [enable |
disable] | dlf [enable | disable] | action [drop | shutdown] |
threshold <value 0-255000> | countdown [<value 0> | <value 5-
30>] | time_interval <value 5-30>}
config traffic control_recover [<portlist> | all]
config traffic trap [none | storm_occurred | storm_cleared | both]
show traffic control {<portlist>}
Each command is listed, in detail, in the following sections.
config traffic control
Purpose Used to configure broadcast/multicast traffic control.
Syntax
config traffic control [<portlist> | all] broadcast [enable | disable] |
multicast [enable | disable] | dlf [enable | disable] | action [drop | shutdown]
| threshold <value 0-255000> | countdown [<value 0> | <value 5-30>] |
time_interval <value 5-30>}
Description This command is used to configure traffic control.
Parameters
<portlist> − Used to specify a range of ports to be configured for traffic control.
The port list is specified by listing the lowest switch number and the beginning
port number on that switch, separated by a colon. Then the highest switch
number, and the highest port number of the range (also separated by a colon)
are specified. The beginning and end of the port list range are separated by a
dash. For example, 1:3 specifies switch number 1, port 3. 2:4 specifies switch
number 2, port 4. 1:3-2:4 specifies all of the ports between switch 1, port 3 and
switch 2, port 4 − in numerical order. Non-contiguous portlist entries are
separated by a comma. (ex: 1:1-1:3,1:7-1:9)
all − Specifies all ports are to be configured for traffic control on the Switch.
broadcast [enable | disable] − Enables or disables broadcast storm control.
multicast [enable | disable] − Enables or disables multicast storm control.
dlf [enable | disable] − Enables or disables dlf traffic control.
action – Used to configure the action taken when a storm control has been