Step Task Command Command ModeDell# interface tengigabitEthernet 1/1Dell(config-if-te-1/1)# dcb-mapSAN_A_dcb_map1 Repeat Steps 1 and 2 to apply a DCB mapto more than one port.You cannot apply a DCB map on an interface that has beenalready configured for PFC using thepfc prioritycommand or which is already configured for lossless queues(pfc no-drop queues command).Configuring PFC without a DCB MapIn a network topology that uses the default ETS bandwidth allocation (assigns equal bandwidth to each priority), you can also enable PFCfor specific dot1p-priorities on individual interfaces without using a DCB map. This type of DCB configuration is useful on interfaces thatrequire PFC for lossless traffic, but do not transmit converged Ethernet traffic.Table 17. Configuring PFC without a DCB MapStep Task Command Command Mode1 Enter interface configuration mode on an Ethernet port. interface {tengigabitEthernetslot/port [/subport] |fortygigabitEthernet slot/port}CONFIGURATION2 Enable PFC on specified priorities. Range: 0-7. Default:None.Maximum number of lossless queues supported on anEthernet port: 2.Separate priority values with a comma. Specify a priorityrange with a dash, for example: pfc priority 3,5-71 You cannot configure PFC using the pfc prioritycommand on an interface on which a DCB map hasbeen applied or which is already configured for losslessqueues (pfc no-drop queues command).pfc priority priority-rangeINTERFACEConfiguring Lossless QueuesDCB also supports the manual configuration of lossless queues on an interface when PFC mode is disabled in a DCB map, apply the map onthe interface. The configuration of no-drop queues provides flexibility for ports on which PFC is not needed, but lossless traffic shouldegress from the interface.Configuring no-drop queues is applicable only on the interfaces which do not need PFC.Example:Port A —> Port BPort C —> Port BPFC no-drop queues are configured for queues 1, 2 on Port B. PFC capability is enabled on priorities 3, 4 on PORT A and C.262 Data Center Bridging (DCB)
