Traffic Control - D-Link xStack DGS-3200-10 User Manual

xStack

Traffic Control

On a c omputer network, packets s uch as Multicast packets and Broa dcast pac kets continually f lood th e n etwork as nor mal
procedure. At times, this traffic m ay increase do to a m alicious endstation on the network or a m alfunctioning device, such as a
faulty network card. Thus, switch throughput problems will arise and consequently affect t he overall performance of th e switch
network. To help rectify this packet storm, the Switch will monitor and control the situation.
Packet storms are monitored to determine if too many packets are flooding the network based on threshold levels provided by the
user. Once a packet storm has been detected, the Switch will drop packets coming into the Switch un til the storm has subsided.
This method can be utilized by selecting the Drop option of the Action parameter 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 Broadca st and Multicast storm s because t he chip only has counters for these two types of pac kets. Once a storm
has bee n detected (that is, once the packet threshold set below has bee n e xceeded), the Switch will shut down t he port t o all
incoming traffic, with the exception of STP BPDU packets, for a time period specified using the Count Down parameter.
If a Tim e In terval parameter ti mes-out for a po rt co nfigured for t raffic control and a packet storm co ntinues, th at port will b e
placed i n Shut down Fore ver mode, which will cause a warning m essage to be se nt to the Trap Receiver. Once in Shutdown
Forever m ode, th e only m ethod of r ecovering t he port is to m anually r ecoup it using th e Port S ettings w indow in the
Configuration fo lder. Select th e d isabled port and return its State to Enabled stat us. To u tilize th is m ethod of Storm Co ntrol,
choose the Shutdown option of the Action parameter in the window below.
Use this window to enable or disable storm control and adjust the threshold for multicast and broadcast storms.
To view the following window, click QoS > Traffic Control:
To configure Traffic Control, set the parameters described in the table below:
Parameter Description
From Port Select the beginning port of the range of port(s) to be configured.
To Port Select the ending port of the range of port(s) to be configured.
Action Select the method of traffic control from the drop-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.
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DGS-3200 Series Layer 2 Gigabit Ethernet Managed Switch
Figure 4 - 3. Traffic Control window
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