Kontron AT8404 CLI - Manual (Page 88)

Switching Commands AT8404
AT8404 CLI Reference Manual Page 2 - 52
2.12 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 degredation in the network. The Storm-Control feature protects against this condition.
FASTPATH 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.)
2.12.1 storm-control broadcast
Use this command to enable broadcast storm recovery mode for a specific interface. 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.
2.12.1.1 no storm-control broadcast
Use this command to disable broadcast storm recovery mode for a specific interface.
2.12.2 storm-control broadcast level
Use this command to configure the broadcast storm recovery threshold for an interface as a percentage of link speed
and enable broadcast storm recovery. If the mode is enabled, broadcast storm recovery is active, and if the rate of
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
Format no storm-control broadcast
Mode Interface Config