Netgear FSM726v3 7200 managed switch v8.x CLI reference manual - Page 113

Storm-Control Commands Managed Switch CLI Manual, Release 8.0 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. The 7000 series 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 stormcontrol 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 "stormcontrol" 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.) 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. 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. Switching Commands v1.0, July 2009 3-77