Netgear XSM7224S User Manual download pdf (Page 123)

ProSafe XSM7224S Managed Stackable Switch CLI Manual, Software Version 9.0

Switching Commands 3-82

v1.0, November 2010

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 degradation 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 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.)

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.

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.

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Netgear XSM7224S User Manual Page 123