Users Guide

priority
Configure the priority for the PFC threshold to be allocated to the buffer space parameters.
Syntax
priority value buffer-size size pause-threshold threshold-value resume-
offset threshold-value shared-threshold-weight size
Parameters
priority Specify the priority of the queue for which the buffer space settings apply
value Enter a number in the range of 0 to 7 to denote the priority to be allocated to the
dynamic buffer control mechanism
buffer-size Ingress buffer size
size Size of the ingress buffer in KB. Enter a number in the range of 0 to 512. The
default is as follows:
● 10G – 45
● 25G – 94
● 40G – 94
● 50G – 161
● 100G – 161
pause-threshold Buffer limit for pause frames to be sent
threshold-value Buffer limit at which the port sends the pause to peer in KB. Enter a number in the
range of 0 to 512. The default is as follows:
● 10G – 9
● 25G – 18
● 40G – 18
● 50G – 18
● 100G – 18
resume-offset Buffer offset limit for resuming in KB
threshold-value Buffer offset limit at which the port resumes the peer in KB. Enter a number in the
range of 0 to 512. The default is 9 KB.
shared-
threshold-weight
Buffer shared threshold weight
size Weightage of the priorities on the shared buffer size in the system. Enter a number
in the range of 0 to 11. The default shared threshold weight is 11.
Command Modes DCB-BUFFER-THRESHOLD mode
Command
History
This guide is platform-specific. For command information about other platforms, see the relevant Dell
Networking OS Command Line Reference Guide.
Version Description
9.10(0.0) Introduced on the S6100.
9.8(1.0) Introduced on the Z9100–ON.
9.7(0.0) Introduced on the S6000-ON.
9.3(0.0) Introduced on the S4810, S4820T, and S6000 platforms.
Usage
Information
For each priority, you can specify the shared buffer threshold limit, the ingress buffer size, buffer limit for
pausing the acceptance of packets, and the buffer offset limit for resuming the acceptance of received
packets. When PFC detects congestion on a queue for a specified priority, it sends a pause frame for the
802.1p priority traffic to the transmitting device.
You can use the priority command to set up both the administrative and peer-related PFC priorities.
For example, you can configure the intended buffer configuration for all eight priorities. If you configure
the number of lossless queues as 4 and if the administrator-configured priorities configured within the
Data Center Bridging (DCB) 413