Configuring Storm Control From Configuration Mode; Pfc Storm - Dell S6100 Configuration Manual

• The storm control is calculated in packets per second.
• Configure storm control.
INTERFACE mode
• Configure the packets per second of broadcast traffic allowed on an interface (ingress only).
INTERFACE mode
storm-control broadcast packets_per_second in
• Configure the packets per second of multicast traffic 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 configured 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.

Configuring Storm Control from CONFIGURATION Mode

To configure storm control from CONFIGURATION mode, use the following command.
From CONFIGURATION mode you can configure storm control for ingress and egress traffic.
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).
• Configure storm control.
CONFIGURATION mode
• Configure the packets per second of broadcast traffic allowed in the network.
CONFIGURATION mode
storm-control broadcast packets_per_second in
• Configure the packets per second (pps) of multicast traffic allowed on C-Series and S-Series networks only.
CONFIGURATION mode
storm-control multicast packets_per_second in
• Configure the packets per second of unknown-unicast traffic allowed in or out of the network.
CONFIGURATION mode
storm-control unknown-unicast packets_per_second in

PFC Storm

When packets flood a network, the result is excessive traffic which affects the performance of the network. When Priority Flow Control
(PFC) is enabled on a port, the traffic flows according to the priority of the data.
PFC storm is the inconsistencies found in the traffic that flows through a PFC enabled port. You can detect this by polling the lossless
queues on each port. This polling is done at periodic intervals. If the queue has traffic with the corresponding egress counter not getting
incremented, then the condition is detected as PFC storm. During such conditions, the traffic corresponding to the port or priority can be
dropped for a specific period of time to overcome the degrade in the network performance.
Once you detect PFC storm on a port or priority, you can discard all packets on that port/priority and enable drop of the queue, so that
traffic corresponding to other priorities is not affected. You can restore the dropped queue to normal state after a period of time.
810 Storm Control