Configuring Switch Information 257Enabling Storm ControlA Broadcast Storm is a result of an excessive amount of Broadcast messages simultaneouslytransmitted across a network by a single port. Forwarded message responses are heaped onto thenetwork, straining network resources or causing the network to time out.Storm Control is enabled per port by defining the packet type and the rate the packets are transmitted.The system measures the incoming Broadcast, Unicast, and Multicast frame rate separately oneach port, and discard frames when the rate exceeds a user-defined rate.The Storm Control page provides fields for enabling and configuring Storm Control. To open theStorm Control page, click Switch→Ports→Storm Control in the tree view.Figure 7-16. Storm ControlThe Storm Control page contains the following fields:Port — The port from which storm control is enabled.Broadcast Control — Enables or disables forwarding Broadcast packet types on the specific interface.Broadcast Mode — Specifies the Broadcast mode currently enabled on the device or stack. Thepossible field values are:Unknown Unicast, Multicast & Broadcast — Counts Unicast, Multicast, and Broadcast traffic.Multicast & Broadcast — Counts Broadcast and Multicast traffic together.Broadcast Only — Counts only Broadcast traffic.Broadcast Rate Threshold (70-285000) — The maximum rate (kilobytes per second) at whichunknown packets are forwarded. The field range is 70-285000 kilobytes per second.
