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DES-3550 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; •
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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 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. The port can be
locked by using the Admin State pull-down menu to Enabled, and clicking Apply.
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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