259Step Command Remarks4. Enable PFC for the specified802.1p priorities.priority-flow-control no-dropdot1p dot1p-listBy default, PFC is disabled for all802.1p priorities.H3C recommends that you enablePFC for the 802.1p priority ofFCoE traffic. If you enable PFC formultiple 802.1p priorities, packetloss might occur during periods ofcongestion.5. Configure the interface to trustthe 802.1p priority carried inpackets.qos trust dot1p By default, the port priority of theincoming port is trusted.For more information about the priority-flow-control and priority-flow-control no-drop dot1p commands,see Interface Command Reference.Configuring the DCBX versionWhen the device is connected to a DCBX-enabled peer device, the following apply:• If the peer device does not support autonegotiation, the device will change its DCBX version tomatch that on the peer device.• If the peer device supports autonegotiation and also uses the standard version as the initial versionfor negotiation, the standard version will be the negotiated result.• If the peer device supports autonegotiation and uses a different DCBX version as the initial versionfor negotiation, the standard version or the initial version the peer device uses will be the negotiatedresult.When the negotiated result is not the expected one, you can configure the expected DCBX version.You can view the DCBX version in use through the Oper version field of the DCBX Control subTLV infopart in the output from the display lldp local-information command.Configuration prerequisitesBefore you configure the DCBX version, complete the following tasks:• Enable LLDP globally and configure the interface to advertise DCBX TLVs.• Configure the APP parameters, ETS parameters, or PFC parameters to be advertised on theinterface.Configuration procedureStep Command Remarks1. Enter system view. system-view N/A2. Enter Layer 2 Ethernetinterface view.interface interface-typeinterface-number N/A
