Storm Control

A traffic storm occurs when incoming packets flood the LAN resulting in network performance degradation. The Storm Control feature protects against this condition.

The switch software provides broadcast, multicast, and unicast storm 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.

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 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 next time that form of storm-control is enabled).

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.

CLI Example

The following examples show how to configure the storm control feature an Ethernet interface. The interface number is 1/g17.

System Configuration

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Dell 6200 SERIES manual Storm Control

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