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Priority-based flow control X-ON Threshold and per-queue alpha

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Priority-based flow control X-ON Threshold and per-queue alpha

The priority-based flow control (PFC) X-ON threshold is the ingress port's priority group (PG) shared buffer limit. At this limit, the ingress port's peer resumes transmission of packets after a brief PAUSE because of the PFC message sent by this ingress port. You can tune globally the limit of buffers that each queue can consume from the shared pool based on the dynamic threshold setting called the alpha value. Starting with Junos OS Evolved devices, you can fine tune the X-ON threshold through the congestion notification profile (CNP) and fine tune the alpha value on a per-queue basis through a scheduler.
Product / Application Software Introduced Release
QFX5220-32CD Junos OS Evolved 22.3R1
QFX5220-128C Junos OS Evolved 22.3R1
QFX5240-64QD Junos OS Evolved 23.4R2
QFX5240-64OD Junos OS Evolved 23.4R2
QFX5241-64OD Junos OS Evolved 23.4X100-D40
QFX5241-64QD Junos OS Evolved 23.4X100-D40
QFX5241-32OD Junos OS Evolved 23.4X100-D43
QFX5250-64OE-L Junos OS Evolved 25.2X100-D20
QFX5140-24CD8O Junos OS Evolved 25.2X100-D20