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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, select the port, you want to configure. Broadcast Storm, Multicast Storm and Unknown
Unicast may be Enabled or Disabled. The Threshold value is the upper threshold at which the specified traffic control is
switched on. This is the number of Broadcast, Multicast or Unknown Unicast packets, in Kbps, received by the switch that
will trigger the storm traffic control measures. The Threshold value can be set from 0 to100000Kbps.
6.3 DHCP Snooping
Introduction to DHCP Snooping Trusted/Untrusted Ports
When an unauthorized DHCP server exists in the network, a DHCP client may obtains an illegal IP
address. To ensure that the DHCP clients obtain IP addresses from valid DHCP servers, The switches can specify a
port to be a trusted port or an untrusted port by the DHCP
snooping function.
l Trusted: A trusted port is connected to an authorized DHCP server directly or indirectly. It forwards
DHCP messages to guarantee that DHCP clients can obtain valid IP addresses.
l Untrusted: An untrusted port is connected to an unauthorized DHCP server. The DHCP-ACK or
DHCP-OFFER packets received from the port are discarded, preventing DHCP clients from
receiving invalid IP addresses.
Choose the menu Security→ DHCP Snooping to load the following page.
By default, all ports of the switch are trusted ports. When confirming which ports are not connected to the DHCP Server,
these ports should be set as DHCP Client ports, that is untrusted ports.
Figure 6-3-1
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