70 Switch FeaturesPriority-based Flow Control (PFC)The Priority-based Flow Control feature allows the switch to pause or inhibittransmission of individual priorities within a single physical link. Byconfiguring PFC to pause a congested priority (priorities) independently,protocols that are highly loss sensitive can share the same link with traffic thathas different loss tolerances. Priorities are differentiated by the priority fieldof the 802.1Q VLAN header.For information about configuring the PFC feature, see "Configuring DataCenter Bridging Features" on page 837.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 837. DCBx is a link-local protocol and operates only on individuallinks. When configuring FIP snooping on a port channel, ensure that all ofthe physical links in the port channel utilize the same auto configurationsetting.Fibre Channel over Ethernet (FCoE) Initialization Protocol SnoopingNOTE: PFC is supported only on the PCM8024-k. The PCM6220, PCM6348, andPCM8024 switches do not support PFC.NOTE: An interface that is configured for PFC is automatically disabled for 802.3xflow control.NOTE: This feature is supported only on the PCM8024-k. The PCM6220,PCM6348, and PCM8024 switches do not support DCBX.NOTE: This feature is supported only on the PCM8024-k. The PCM6220,PCM6348, and PCM8024 switches do not support FIP Snooping.
