Priority Flow Control Commands 911Default ConfigurationPriority-flow-control mode is off (disabled) by default.Command ModeDatacenter-Bridging Configuration modeUser GuidelinesNOTE: This command is only available on N40xx series switches.PFC must be enabled before FIP snooping can operate over the interface. Usethe no form of the command to return the mode to the default (off). VLANtagging (trunk or general mode) must be enabled on the interface in order tocarry the dot1p value through the network. Additionally, the dot1mapping toclass-of-service must be set to one-to-one. Ports that are configured to use theDCBX auto-configuration roles (auto-up or auto-down) have their PFCsettings overridden. Only ports configured as DCBX manual role utilize theconfigured PFC settings.When PFC is enabled on an interface, the normal PAUSE control mechanismis operationally disabled. Because PFC is a link local protocol, it must beconfigured on all the interfaces aggregated in a port channel. Onlyconfiguring some of the ports in a port channel to use PFC will causeunexpected results and is not supported.ExampleThe following example enables PFC on an interface.s1(config)#interface te1/0/1s1(config-if-Te1/0/1)#datacenter-bridgings1(config-if-dcb)#priority-flow-control mode onpriority-flow-control priorityUse the priority-flow-control priority command in Datacenter-BridgingConfiguration mode to enable the priority group for lossless (no-drop) orlossy (drop) behavior on the selected interface. Up to two lossless prioritiescan be enabled on an interface.Use the no form of the command to return all priorities to their default lossybehavior.
