Reference Guide

Broadcast Storm Control | 979
Layer 2 Broadcast Storm Control
Unknown-unicast packets are those for which the switch has no entry in its MAC address table for the
packet destination MAC. In this case the switch broadcasts (floods) these packets on the VLAN. This extra
traffic unnecessary and can reduce performance.
Multicast Storm Control
Multicast Storm Control is supported only on platforms: c s
Task Command Syntax Command Mode
On the E-Series, suppress Layer 3 all-hosts and subnet
broadcasts on ingress and egress if they exceed a
user-defined limit.
storm-control broadcast
percentage partial-percentage [in |
out]
CONFIGURATION
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
CONFIGURATION
FTOS Behavior: On the E-Series, if unknown-unicast Storm Control is enabled on an interface or
globally on the ingress, and DSCP marking is enabled and set to DSCP=2 for data traffic, the traffic is
queued to Queue 2 instead of Queue 0.
Task Command Syntax Command Mode
On the E-Series, suppress unknown-unicast packets if
they exceed a user-defined limit.
storm-control unknown-unicast
percentage partial-percentage [in |
out]
CONFIGURATION
On the C-Series and S-Series, unknown-unicast packets
on ingress if they exceed a user-defined limit.
storm-control unknown-unicast
packets-per-second in
CONFIGURATION
Task Command Syntax Command Mode
Suppress multicast packets if they exceed a user-defined limit. storm-control multicast
packets-per-second in
CONFIGURATION