1044 | Broadcast Storm Controlw w w . d e l l . c o m | s u p p o r t . d e l l . c o mImplementation Information• Storm Control is supported on the E-Series ExaScale platform with FTOS 8.1.1.0 and later.• The percentage of storm control is calculated based on the advertised rate of the line card, not by thespeed setting of the interface.• Do not apply per-VLAN QoS on an interface that has Storm Control enabled either on an interface orglobally.• On E-Series, bi-directional traffic (unknown-unicast and broadcast) along with egress Storm Controlcauses the configured traffic rates to be split between the involved ports. The percentage of traffic thateach port receives after the split is not predictable. Ports are affected whether they are in the same ordifferent port-pipes or line cards.Broadcast Storm ControlFTOS offers Layer 3 and Layer 2 broadcast storm control.Layer 3 Broadcast Storm ControlLayer 3 Storm Control suppresses all-hosts and subnet broadcasts if they exceed a user-defined packet rate.You can enable Storm Control for Layer 3 broadcasts from INTERFACE mode, CONFIGURATIONmode, or both. Each option has a different result.• From INTERFACE mode: Storm Control limits ingress broadcast traffic on a single interface.• From CONFIGURATION mode:• On the E-Series, Storm Control limits ingress and egress broadcast traffic on all interfaces.• On the C-Series and S-Series, Storm Control limits only ingress broadcast traffic, but still on allinterfaces.• From INTERFACE and CONFIGURATION mode: the INTERFACE mode configuration overridesthe CONFIGURATION mode configuration.FTOS Behavior: On the E-Series, when broadcast Storm Control is enabled on an interface orglobally on ingress and DSCP marking is enabled and set to DSCP=1 is configured for data traffic, thetraffic is queued to Queue 1 instead of Queue 0.
