Switch Feature Overview 75has different loss tolerances. Priorities are differentiated by the priority fieldof the 802.1Q VLAN header. The N4000 switches support lossless transport offrames on up to two priority classes.For information about configuring the PFC feature, see "Configuring DataCenter Bridging Features" on page 983.Data Center Bridging Exchange (DBCx) ProtocolThe Data Center Bridging Exchange Protocol (DCBx) is used by DCBdevices to exchange configuration information with directly connected peers.The protocol is also used to detect misconfiguration of the peer DCB devicesand, optionally, for configuration of peer DCB devices. For information aboutconfiguring DCBx settings, see "Configuring Data Center Bridging Features"on page 983. DCBx is a link-local protocol and operates only on individuallinks.Enhanced Transmission SelectionEnhanced Transmission Selection (ETS) allows the switch to allocatebandwidth to traffic classes and share unused bandwidth with lower-prioritytraffic classes while coexisting with strict-priority traffic classes. ETS issupported on the Dell Networking N4000 series switches and can beconfigured manually or automatically using the auto configuration feature.For more information about ETS, see "Enhanced Transmission Selection" onpage 999.NOTE: An interface that is configured for PFC is automatically disabled for 802.3xflow control.NOTE: This feature is available on the N4000 switches only.NOTE: This feature is available on the N4000 switches only.
