D-Link DES-3552 [81/260] Traffic control

DES-3550 Fast Ethernet Layer 2 Switch

Traffic Control

Use the Traffic Control Setting window to enable or disable storm control and adjust the threshold for multicast and

broadcast storms, as well as DLF (Destination Look Up Failure). Traffic control settings are applied to individual Switch

modules. To view the following window, click Configuration > VLANs > Traffic Control:

Figure 6- 40. Traffic Control Setting window

Traffic or storm control is used to stop broadcast, multicast or ARP request storms that may result when a loop is created.

The Destination Look Up Failure control is a method of shutting down a loop when a storm is formed because a MAC

address cannot be located in the Switch's forwarding database and it must send a packet to all ports or all ports on a VLAN.

To configure Traffic Control, first select a group of ports by using the Group pull-down menu. As seen in the figure above,

this section is set by 5 specified groups of ports on the Switch.

− Group 1 refers to ports 1 through 8;

− Group 2 refers to ports 9 through 16;

− Group 3 refers to ports 17 through 24;

− Group 4 refers to ports 25 through 32;

− Group 5 refers to ports 33 through 40;

− Group 6 refers to ports 41 through 48;

− Group 7 refers to mini GBIC port 49;

− Group 8 refers to mini GBIC port 50.

Broadcast Storm, Multicast Storm and Destination Unknown may be Enabled or Disabled for either group.

The Threshold value is the upper threshold at which the specified traffic control is switched on. This is the number of

Broadcast, Multicast or DLF packets, in Kpps, received by the Switch that will trigger the storm traffic control measures. The

Threshold value can be set from 0 to 255 kilo packets. The default setting is 128. The settings of each port may be viewed in

the Traffic Control Table in the same window.

Click Apply to implement changes made.