Dell PowerConnect M6220, User Configuration Manual

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Switch Features
Priority-based Flow Control (PFC)
The Priority-based Flow Control feature allows the switch to pause or inhibit
transmission of individual priorities within a single physical link. By
configuring PFC to pause a congested priority (priorities) independently,
protocols that are highly loss sensitive can share the same link with traffic that
has different loss tolerances. Priorities are differentiated by the priority field
of the 802.1Q VLAN header.
For information about configuring the PFC feature, see "Configuring Data
Center Bridging Features" on page 837.
Data Center Bridging Exchange (DBCx) Protocol
The Data Center Bridging Exchange Protocol (DCBx) is used by DCB
devices to exchange configuration information with directly connected peers.
The protocol is also used to detect misconfiguration of the peer DCB devices
and, optionally, for configuration of peer DCB devices. For information about
configuring DCBx settings, see "Configuring Data Center Bridging Features"
on page 837. DCBx is a link-local protocol and operates only on individual
links. When configuring FIP snooping on a port channel, ensure that all of
the physical links in the port channel utilize the same auto configuration
setting.
Fibre Channel over Ethernet (FCoE) Initialization Protocol Snooping
NOTE:
PFC is supported only on the PCM8024-k. The PCM6220, PCM6348, and
PCM8024 switches do not support PFC.
NOTE:
An interface that is configured for PFC is automatically disabled for 802.3x
flow 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.