Priority Flow Control (PFC) is an IEEE standard (802.1qbb) for link level flow control on Ethernet networks. Functionally, this feature is similar to the IEEE standard 802.3 for PAUSE mechanism, except that it operates at the granularity of individual packet priorities or traffic class, instead of port level. When a queue corresponding to traffic with a particular traffic class reaches a predetermined, either auto or statically set, threshold, the switch chip generates a PFC frame and sends it back to the sender. For PFC to work effectively end to end on the network, all switches and hosts in the traffic path are configured to enable PFC, and configured for traffic class to priority mappings.

This command allows you to modify PFC priority on ports.

Syntax   port-pfc-modify priority priority port-list port-list

priority priority

Specify a priority for PFC. This is a number between 0 and 7.

port-list port-list

Specify a port list to apply PFC.

Defaults   None

Access   Network administrator

History   Command introduced in Version 2.5.4.

Usage   This command is used to modify PFC for link level flow control for traffic on the network. You can create up to three configurations.

Examples  To modify the PFC configuration to port 11-15 with a priority group of 2, use the following command:

CLI network-admin@switch > port-pfc-modify priority 2 port 11-15

Priority configuration will be effective after restart.

See Also