Reference Guide

978 | Broadcast Storm Control
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Broadcast Storm Control
FTOS offers Layer 3 and Layer 2 broadcast storm control.
Layer 3 Broadcast Storm Control
Layer 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, CONFIGURATION
mode, 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 all
interfaces.
• From INTERFACE and CONFIGURATION mode: the INTERFACE mode configuration overrides
the CONFIGURATION mode configuration.
Enable Broadcast Storm Control on an Interface
Enabling Storm control on an interface affects only ingress broadcasts.
Enable Broadcast Storm Control on all Interfaces
The result of enabling Storm Control globally varies by platform:
• On the E-Series, enabling Storm Control from CONFIGURATION mode limits ingress and egress
broadcast traffic on all interfaces.
• On the C-Series and S-Series, enabling Storm Control from CONFIGURATION mode limits only
ingress broadcast traffic, but still on all interfaces.
FTOS Behavior: On the E-Series, when broadcast Storm Control is enabled on an interface or
globally on ingress and DSCP marking is enabled and set to DSCP=1 is configured for data traffic, the
traffic is queued to Queue 1 instead of Queue 0.
Task Command Syntax Command Mode
On the E-Series, suppress Layer 3 all-hosts and subnet
broadcasts on ingress if they exceed a user-defined
limit.
storm-control broadcast
percentage partial-percentage [in |
out]
INTERFACE
On the C-Series and S-Series, suppress Layer 3 all-host
and subnet broadcasts on ingress if they exceed a
user-defined limit.
storm-control broadcast
packets-per-second in
INTERFACE