3Com 2928 User Guide - Page 116
Storm Constrain Configuration, Overview, Configuring Storm Constrain - specifications
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1 Storm Constrain Configuration Overview The storm constrain function limits traffic of a port within a predefined upper threshold to suppress packet storms in an Ethernet. With this function enabled on a port, the system detects the amount of broadcast traffic, multicast traffic, and unicast traffic reaching the port periodically. When a type of traffic exceeds the threshold for it, the function, as configured, blocks or shuts down the port, and optionally, sends trap messages and logs. Alternatively, you can configure the storm suppression function to control a specific type of traffic. As the storm suppression function and the storm constrain function are mutually exclusive, do not enable them at the same time on an Ethernet port. For example, with broadcast storm suppression enabled on a port, do not enable storm constrain for broadcast traffic on the port. The storm suppression function is configured in Device > Port Management. For details, refer to Port Management. With storm constrain enabled on a port, you can specify the system to act as follows when a certain type of traffic (broadcast, multicast, or unicast) exceeds the corresponding upper threshold: z Block: Block the port. In this case, the port is blocked and thus stops forwarding the traffic of this type until the type of traffic drops down below the lower threshold. Note that a port blocked by the storm constrain function can still forward other types of traffic and collect statistics for the blocked traffic. z Shutdown: Shut down the port. In this case, the port is shut down and stops forwarding all types of traffic. To bring up the port, select Device > Port Management to configure the port, or cancel the storm constrain setting on the port. Configuring Storm Constrain Setting the Traffic Statistics Generating Interval Select Device > Storm Constrain from the navigation tree to enter the page shown in Figure 1-1. In the Interval for generating traffic statistics text box, input the traffic statistics generating interval for storm constrain. 1-1