Deployment Guide

Version Description
9.10(0.1) Introduced on the S6010-ON and S4048T-ON.
9.10(0.0) Introduced on the S6100-ON.
9.8(1.0) Introduced on the Z9100–ON.
9.8(0.0) Introduced on the S3048-ON and S4048-ON.
9.7(0.0) Introduced on the S6000-ON and Z9500.
9.3(0.0) Introduced on the S4810, S4820T, and S6000 platforms.
Usage
Information
You can configure up to a maximum of four lossless (PFC) queues. By configuring four lossless queues,
you can configure four different priorities and assign a particular priority to each application that your
network is used to process. For example, you can assign a higher priority for time-sensitive applications
and a lower priority for other services, such as file transfers. You can configure the amount of buffer
space to be allocated for each priority and the pause or resume thresholds for the buffer. This method of
configuration enables you to effectively manage and administer the behavior of lossless queues.
Example
DellEMC(conf-if-te-1/1/1)# dcb-policy buffer-threshold testDellEMC(conf-if-
tf-1/1)# dcb-policy buffer-threshold test
dcb pfc-total-buffer-size
Configure the total buffer size for PFC in kilobytes.
Syntax
dcb pfc-total—buffer—size buffer-size
Parameters
buffer-size Enter a number in the range of 0 to 3399.
Default The default is 2656KB.
Command Modes CONFIGURATION mode
Command
History
This guide is platform-specific. For command information about other platforms, see the relevant Dell EMC
Networking OS Command Line Reference Guide.
Version Description
9.11(2.0P0) Default value is changed from 3088 KB to 2656 KB in the Z9100-ON and S6100-ON.
9.10(0.1) Introduced on the S6010-ON and S4048T-ON.
9.10(0.0) Introduced on the S6100.
9.8(1.0) Introduced on the Z9100–ON.
9.8(0.0P5) Introduced on the S4048–ON.
9.7(0.0) Introduced on the S6000-ON.
9.6(0.0) Introduced on the S5000.
9.3(0.0) Introduced on the S6000, S4810, and S4820T.
Usage
Information
Configure the maximum buffer available for PFC traffic. You can choose to increase or decrease the buffer size that
is allocated in the system by default. However, if you modify the PFC buffer size lower than the previously configured
size, the system determines whether this reduction in size is valid without disrupting the existing configuration. In
such a scenario, disable and re-enable DCB.
The lossless queue limit per port is validated based on the dcb pfc-queues command. PFC queue configuration
identifies the maximum number of queues a port can support. Although the queue limit per port is a baseline when
dynamic buffering is enabled, the limit per port for queues depends on the availability of the buffer.
Example
DellEMC(conf)#dcb pfc-total-buffer-size 2800
DellEMC(conf)#
498 Data Center Bridging (DCB)