Product Manual

DES-3526 / DES-3526DC Fast Ethernet Layer 2 Switch
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 mini GBIC port 25;
• Group 5 refers to mini GBIC port 26.
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 Kbps, received by the Switch that will trigger
the storm traffic control measures. The Threshold value can be set from 0 to 255 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.
Port Security
A given port's (or a range of ports') dynamic MAC address learning can be locked such that the current
source MAC addresses entered into the MAC address forwarding table can not be changed once the
port lock is enabled. Using the Admin State pull-down menu to Enabled, and clicking Apply can lock
the port.
Port Security is a security feature that prevents unauthorized computers (with source MAC addresses)
unknown to the Switch prior to locking the port (or ports) from connecting to the Switch's locked ports
and gaining access to the network.
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