Users Guide

Example of
commands in dcb
buffer—
threshold mode
qos-policy-buffer queue queue-num pause no-drop queue buffer-size size
pause-threshold threshold-value resume-offset threshold-value shared-
threshold-weight size
Dell(conf)# qos-policy-buffer test
Dell(conf-qos-policy-buffer)#queue 0 pause no-drop buffer-size
128000 pause-threshold 103360 resume-threshold 83520
Dell(conf-qos-policy-buffer)# queue 4 pause no-drop buffer-size
128000 pause-threshold 103360 resume-threshold 83520
priority value buffer-size size pause-threshold threshold-value resume-
offset threshold-value shared-threshold-weight size
Dell(conf-dcb-buffer-thr)#priority 0 buffer-size 52 pause-threshold 16
resume-offset 10 shared-threshold-weight 7
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 7787. The
default is 45 KB.
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 7787. The default is 10 KB.
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 1 to 7787. The default is 10 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 9. The default shared threshold weight is 10.
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
9.8(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.
456 Data Center Bridging (DCB)