Administrator Guide

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
Dell(conf)#dcb pfc-queues 4
dcb {ets | pfc} enable
Enable priority flow control or enhanced transmission selection on interface.
C9000 Series
Syntax
dcb {ets | pfc} enable
• To disable ETS on interface, use “no dcb ets enable” command.
• To disable PFC on interface, use “no dcb pfc enable” command.
Defaults Enable
Command Modes INTERFACE
Command History
Version Description
9.9(0.0) Introduced on the C9010.
9.7(0.1) Introduced on the S3048-ON and S4048-ON.
9.7(0.0) Introduced on the S6000-ON.
9.3 (0.1) Introduced on S6000, S4810, and S4820T.
Usage Information
PFC and ETS are enabled by default on the interfaces when DCB is globally enabled (refer to dcb enable). In some
network topology, you may want to disable PFC on an interface and apply link level flow control; Similarly you may
want to disable ETS on an interface and apply QoS bandwidth configurations.
Limitations
• “dcb-map” CLI on interface is mutually exclusive to “no dcb ets enable” and “no dcb pfc
enable”.
• “pfc priority” CLI is mutually exclusive to “no dcb pfc enable” command.
• Deprecated CLI “dcb-policy input” and “no dcb pfc enable” cannot coexist at interface level.
• Deprecated CLI “dcb-policy output” and “no dcb ets enable” cannot coexist at interface level.
550 Data Center Bridging (DCB)