D-Link xStack DGS-3426 Cli Manual - Raffic

xStack DGS-3400 Series Layer 2 Gigabit Managed Switch CLI Manual 

12 

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RAFFIC 

C

ONTROL 

C

OMMANDS

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  [ | all] {broadcast [enable | disable] | multicast [enable | 

disable] | dlf [enable | disable] | action [drop | shutdown] | 

threshold | countdown [ |

30>] | time_interval } 

config traffic 

control_recover 

[ | all] 

config traffic trap 

[none | storm_occurred | storm_cleared | both] 

show traffic control 

{} 

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 [ | all] broadcast [enable | disable]  | 

multicast [enable | disable] | dlf [enable | disable] | action [drop | 

shutdown] | threshold | countdown [ |