Step Task Command Command ModeYou cannot configure PFC no-dropqueues on an interface on which aDCB map with PFC enabled hasbeen applied, or which is alreadyconfigured for PFC using the pfcpriority command.Range: 0-3. Separate queue valueswith a comma; specify a priorityrange with a dash; for example: pfcno-drop queues 1,3 or pfc no-dropqueues 2-3 Default: No losslessqueues are configured.Applying a DCB Map on a Line CardOn the C9010, DCB is supported per-line card. If the traffic handled by a DCB map is transmitted on ports ondifferent line cards, you must manually configure the DCB map on the backplane ports of the C9010 linecards on which the ports reside.• Apply a DCB map with PFC and ETS settings on the backplane ports of C9010 line cards.CONFIGURATION modedcb-map {linecard {0-11 | all} [port-set {0-3 | all}] backplane all dcb-map-nameNOTE: On the C9010, linecard 10 and linecard 11 correspond to RPM0 and RPM1 respectively.To enable DCB across C9010 line cards, apply a DCB map on all installed line cards (linecard 0–9)and RPMs (linecard 10–11).NOTE: If the DCB map you apply to the backplane ports of C9010 RPMs (linecard 10–11) configurestwo or more priority groups, you must increase the size of the PFC shared and total buffers (dcb pfc-shared-buffer-size and dcb pfc-total-buffer-size commands).Data Center Bridging: DefaultConfigurationBefore you configure PFC and ETS on a switch see the priority group setting taken into account the followingdefault settings:• DCB is enabled.• The PFC memory buffer supports up to 2 lossless queues per port on all PFC enabled ports.• PFC and ETS are globally enabled by default.The default dot1p priority-queue assignments are applied as follows:Dell(conf)#do show qos dot1p-queue-mappingDot1p Priority : 0 1 2 3 4 5 6 7Queue : 1 0 2 3 4 5 6 7Data Center Bridging (DCB) 302
