Security Commands 1034console(config)#interface range gi1/0/1-24console(config-if)#storm-control multicast level 20console(config-if)#storm-control multicast action shutdownconsole(config-if)#exitstorm-control unicastUse the storm-control unicast command in Interface Configuration mode toenable storm control for an interface. Unicast storm control limits thenumber of unicast destination lookup failures (DLFs). Use the no form of thecommand to disable unicast storm control or to return the configuration tothe default.Syntaxstorm-control unicast [level level |rate rate|action{shutdown|trap}]no storm-control unicast [level | rate]• level— The configured rate as a percentage of link bandwidth (Range: 0-100)• rate—The configured rate in packets per second. (Range: 0-14880000)• action—The configured action: shutdown or trap.Default ConfigurationBy default, unicast storm control is not enabled on any interfaces.The default threshold for unicast traffic is 5% of link bandwidth.Command ModeInterface Configuration (Ethernet) mode, Interface Range modeUser GuidelinesA destination lookup failure (DLF) is when a L2 unicast packet is unable toresolve the destination MAC address to an egress interface (no MACforwarding address entry exists). The standard behavior for L2 DLFs is toflood the packet on all ports in the VLAN other than the port on which thepacket was received. This flooding behavior can cause significant amounts ofbandwidth to be consumed, potentially disrupting the forwarding of othertraffic.
