A data center engineer is deploying FCoE on a Nexus switch to consolidate Ethernet and Fibre Channel traffic on the same 10G links. During validation, FCoE frames are occasionally being dropped under heavy LAN load, causing SCSI timeouts on the storage array. The engineer confirms PFC is enabled on the no-drop class for FCoE. Which additional configuration ensures FCoE traffic receives a guaranteed minimum share of link bandwidth so it is not starved by LAN traffic during congestion?