Priority-Flow-Control Priority - Dell Networking 2024 Reference Manual

Default Configuration
Priority-flow-control mode is off (disabled) by default.
Command Mode
Datacenter-Bridging Configuration mode
User Guidelines
NOTE: This command is only available on N40xx series switches.
PFC must be enabled before FIP snooping can operate over the interface. Use
the no form of the command to return the mode to the default (off). VLAN
tagging (trunk or general mode) must be enabled on the interface in order to
carry the dot1p value through the network. Additionally, the dot1mapping to
class-of-service must be set to one-to-one. Ports that are configured to use the
DCBX auto-configuration roles (auto-up or auto-down) have their PFC
settings overridden. Only ports configured as DCBX manual role utilize the
configured PFC settings.
When PFC is enabled on an interface, the normal PAUSE control mechanism
is operationally disabled. Because PFC is a link local protocol, it must be
configured on all the interfaces aggregated in a port channel. Only
configuring some of the ports in a port channel to use PFC will cause
unexpected results and is not supported.
Example
The following example enables PFC on an interface.
s1(config)#interface te1/0/1
s1(config-if-Te1/0/1)#datacenter-bridging
s1(config-if-dcb)#priority-flow-control mode on

priority-flow-control priority

Use the priority-flow-control priority command in Datacenter-Bridging
Configuration mode to enable the priority group for lossless (no-drop) or
lossy (drop) behavior on the selected interface. Up to two lossless priorities
can be enabled on an interface.
Use the no form of the command to return all priorities to their default lossy
behavior.
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Priority Flow Control Commands