Command Reference Guide

Storm-Control Commands
CLI Command Reference
September 2014 Page 352
HP Moonshot Switch Module CLI Command Reference
Storm-Control Commands
This section describes commands you use to configure storm-control and view storm-control configuration
information. A traffic storm is a condition that occurs when incoming packets flood the LAN, which creates
performance degradation in the network. The Storm-Control feature protects against this condition.
HP Moonshot Switch Module provides broadcast, multicast, and unicast story recovery for individual
interfaces. Unicast Storm-Control protects against traffic whose MAC addresses are not known by the system.
For broadcast, multicast, and unicast storm-control, if the rate of traffic ingressing on an interface increases
beyond the configured threshold for that type, the traffic is dropped.
To configure storm-control, you will enable the feature for all interfaces or for individual interfaces, and you
will set the threshold (storm-control level) beyond which the broadcast, multicast, or unicast traffic will be
dropped. The Storm-Control feature allows you to limit the rate of specific types of packets through the switch
on a per-port, per-type, basis.
Configuring a storm-control level also enables that form of storm-control. Disabling a storm-control level (using
the “no” version of the command) sets the storm-control level back to the default value and disables that form
of storm-control. Using the “no” version of the “storm-control” command (not stating a “level”) disables that
form of storm-control but maintains the configured “level” (to be active the next time that form of storm-
control is enabled.)
storm-control broadcast
Use this command to enable broadcast storm recovery mode for all interfaces (Global Config mode) or one or
more interfaces (Interface Config mode). If the mode is enabled, broadcast storm recovery is active and, if the
rate of L2 broadcast traffic ingressing on an interface increases beyond the configured threshold, the traffic will
be dropped. Therefore, the rate of broadcast traffic will be limited to the configured threshold.
Note: The actual rate of ingress traffic required to activate storm-control is based on the size of
incoming packets and the hard-coded average packet size of 512 bytes - used to calculate a packet-
per-second (pps) rate - as the forwarding-plane requires pps versus an absolute rate kbps. For
example, if the configured limit is 10%, this is converted to ~25000 pps, and this pps limit is set in
forwarding plane (hardware). You get the approximate desired output when 512bytes packets are
used.
Default disabled
Format
storm-control broadcast
Mode • Global Config
•Interface Config