Dell PowerConnect 8100 CLI Reference Guide - Page 932
Commands in this priority-flow-control mode, Syntax
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addition to the headroom. With two no-drop priorities per interface and static allocations, there is only about 30 percent of the buffer space available for normal forwarding behavior. The effective default behavior on an interface enabled for PFC without a nodrop priority is that no flow control (legacy or PFC) is enabled. If the user enables PFC but does not create any no-drop priorities, the interface will not be lossless. Changing the drop and no-drop capabilities on an interface, either in flow control or priority flow control, may require that all ports briefly drop link. The priority to flow control group cannot be changed while traffic is running. When 802.3 link flow control is enabled, all priorities are mapped to a single flow control group. When 802.1Qbb is enabled, the priorities are each mapped into their own flow control group, where lossless groups have additional buffer to handle the round trip delay for flow control. In order to minimize the impact, the link will only be dropped when changing between 802.3 and 802.1Qbb. Commands in this Chapter This chapter explains the following commands: priority-flow-control mode priority-flow-control priority clear priority-flow-control statistics show interfaces priority-flow-control priority-flow-control mode Use the priority-flow-control mode on command in Datacenter-Bridging Config mode to enable Priority-Flow-Control (PFC) on an interface. To disable Priority-Flow-Control, use the no form of the command. Syntax priority-flow-control mode on priority-flow-control mode off no priority-flow-control mode 932 Priority Flow Control Commands
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