Broadcast Storm Control | 1045Enable Broadcast Storm Control on an InterfaceEnabling Storm control on an interface affects only ingress broadcasts.Enable Broadcast Storm Control on all InterfacesThe result of enabling Storm Control globally varies by platform:• On the E-Series, enabling Storm Control from CONFIGURATION mode limits ingress and egressbroadcast traffic on all interfaces.• On the C-Series and S-Series, enabling Storm Control from CONFIGURATION mode limits onlyingress broadcast traffic, but still on all interfaces.Layer 2 Broadcast Storm ControlUnknown-unicast packets are those for which the switch has no entry in its MAC address table for thepacket destination MAC. In this case the switch broadcasts (floods) these packets on the VLAN. This extratraffic unnecessary and can reduce performance.Task Command Syntax Command ModeOn the E-Series, suppress Layer 3 all-hosts and subnetbroadcasts on ingress if they exceed a user-definedlimit.storm-control broadcast percentagepartial-percentage [in | out]INTERFACEOn the C-Series and S-Series, suppress Layer 3 all-hostand subnet broadcasts on ingress if they exceed auser-defined limit.storm-control broadcastpackets-per-second inINTERFACETask Command Syntax Command ModeOn the E-Series, suppress Layer 3 all-hosts and subnetbroadcasts on ingress and egress if they exceed auser-defined limit.storm-control broadcast percentagepartial-percentage [in | out]CONFIGURATIONOn the C-Series and S-Series, suppress Layer 3 all-hostand subnet broadcasts on ingress if they exceed auser-defined limit.storm-control broadcastpackets-per-second inCONFIGURATIONFTOS Behavior: On the E-Series, if unknown-unicast Storm Control is enabled on an interface orglobally on the ingress, and DSCP marking is enabled and set to DSCP=2 for data traffic, the traffic isqueued to Queue 2 instead of Queue 0.
