Dell EMC Networking OS Configuration Guide for the S5048F–ON System 9.14.2.4

Configuring Priority-Based Flow Control

Priority-Based Flow Control (PFC) provides a flow control mechanism based on the 802.1p priorities in converged Ethernet traffic received on an interface and is enabled by default when you enable DCB.

1. Create a DCB Map.
   CONFIGURATION mode
   dcb-map dcb-map-name
   The dcb-map-name variable can have a maximum of 32 characters.
2. Create a PFC group.
   CONFIGURATION mode
   priority-group group-num {bandwidth bandwidth | strict-priority} pfc on
   The range for priority group is from 0 to 7.
   Set the bandwidth in percentage. The percentage range is from 1 to 100% in units of 1%.
   Committed and peak bandwidth is in megabits per second. The range is from 0 to 100000.
   Committed and peak burst size is in kilobytes. Default is 50. The range is from 0 to 100000.
   The pfc on command enables priority-based flow control.
3. Specify the dot1p priority-to-priority group mapping for each priority.
   priority-pgid dot1p0_group_num dot1p1_group_num ...dot1p7_group_num
   Priority group range is from 0 to 7. All priorities that map to the same queue must be in the same priority group.
   Leave a space between each priority group number. For example: priority-pgid 0 0 0 1 2 4 4 4 in which priority group 0 maps to dot1p priorities 0, 1, and 2; priority group 1 maps to dot1p priority 3; priority group 2 maps to dot1p priority 4; priority group 4 maps to dot1p priorities 5, 6, and 7.