D-Link DXS-3250E Installation Guide - Page 109

D-Link DXS-3250/DXS-3227P/DXS-3227 User Guide Enabling Storm Control Storm control limits the amount of Multicast and Broadcast frames accepted and forwarded by the device. When Layer 2 frames are forwarded, Broadcast, and Multicast frames are flooded to all ports on the relevant VLAN. This occupies bandwidth, and loads all nodes on all ports. A Broadcast Storm is a result of an excessive amount of broadcast messages simultaneously transmitted across a network by a single port. Forwarded message responses are heaped onto the network, straining network resources or causing the network to time out. Storm control is enabled for all Gigabit ports by defining the packet type and the rate the packets are transmitted. The system measures the incoming Broadcast and Multicast frame rates separately on each port, and discards the frames when the rate exceeds a user-defined rate. The Storm Control Page provides fields for configuring broadcast storm control. To enable storm control: 1. Click Advanced Setup > Network Security > Traffic Control > Storm Control. The Storm Control Page opens. Figure 59: Storm Control Page The Storm Control Page contains the following fields: • Port - Indicates the port from which storm control is enabled. The possible field values are: - Enable - Enables storm control on the selected port. - Disable - Disables storm control on the selected port. • Enable Broadcast Control - Indicates if forwarding Broadcast packet types on the interface. • Broadcast Mode - Specifies the Broadcast mode currently enabled on the device. The possible field values are: - Unknown Unicast, Multicast & Broadcast - Counts Unicast, Multicast, and Broadcast traffic. Page 109