Setup Guide

INTERFACE mode
storm-control broadcast packets_per_second in
• Congure the packets per second of multicast trac allowed on C-Series or S-Series interface (ingress only) network only.
INTERFACE mode
storm-control multicast packets_per_second in
• Shut down the port if it receives the PFC/LLFC packets more than the congured rate.
INTERFACE mode
storm-control pfc-llfc pps in shutdown
NOTE: PFC/LLFC storm control enabled interface disables the interfaces if it receives continuous PFC/LLFC packets. It
can be a result of a faulty NIC/Switch that sends spurious PFC/LLFC packets.
Conguring Storm Control from CONFIGURATION Mode
To congure storm control from CONFIGURATION mode, use the following command.
From CONFIGURATION mode you can congure storm control for ingress and egress trac.
Do not apply per-virtual local area network (VLAN) quality of service (QoS) on an interface that has storm-control enabled (either on an
interface or globally).
• Congure storm control.
CONFIGURATION mode
• Congure the packets per second of broadcast trac allowed in the network.
CONFIGURATION mode
storm-control broadcast packets_per_second in
• Congure the packets per second (pps) of multicast trac allowed on C-Series and S-Series networks only.
CONFIGURATION mode
storm-control multicast packets_per_second in
• Congure the packets per second of unknown-unicast trac allowed in or out of the network.
CONFIGURATION mode
storm-control unknown-unicast packets_per_second in
Detect PFC Storm
The following section explains the procedure to detect the PFC storm.
You can detect the PFC storm by polling the lossless queues in a port or priority periodically. When the queue depth is not equal to zero or
when the queue has trac after subsequent number of polling, then the port or priority is detected to have the PFC storm.
• Use the polling—interval {interval in milli-seconds} command to set the polling interval. The queue trac and
egress counters are polled.
• Use the xoff-state threshold polling-count {number of polling-interval} command to set the number of
times the polling should be done. If the trac and the egress counter remain the same after the subsequent polling, then the
corresponding port or priority is detected to have PFC storm.
• Once PFC storm is detected on an interface, you can use the storm-control pfc in queue-drop command on the interface
to drop the ingress packets. This command triggers a queue drop state on the interface with PFC storm, so that the trac through
other ports and priorities are not aected.
For more information about the above commands, see the Dell EMC Networking OS Command Line Reference Guide.
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Storm Control