Users Guide

dcb pfc-queues
Congure the number of PFC queues.
Syntax
dcb pfc-queues value
Parameters
value Enter the number of PFC queues in the range of 0 through 4. The number of ports
supported based on lossless queues congured will depend on the buer.
Default The default number of PFC queues in the system is 2 for S4810 and 1 for S6000 platforms.
Command Modes CONFIGURATION mode
Command History
Version Description
9.7(0.0) Introduced on the S6000-ON and Z9500.
9.3(0.0) Introduced on the S4810 and S6000 platforms.
Usage Information You can congure up to a maximum of four lossless (PFC) queues. By conguring four lossless queues, you
can congure four dierent 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 le transfers. You can congure the amount of buer space to be
allocated for each priority and the pause or resume thresholds for the buer. This method of conguration
enables you to eectively manage and administer the behavior of lossless queues.
Example
Dell(conf)#dcb pfc-queues 4
dcb {ets | pfc} enable
Enable priority ow control or enhanced transmission selection on interface.
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
9.7(0.0) Introduced on the S6000-ON and Z9500.
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 ow control;
Similarly you may want to disable ETS on an interface and apply QoS bandwidth congurations.
Limitations
• “dcb-map” CLI on interface is mutually exclusive to “no dcb ets enable” and “no dcb pfc
enable”.
540
Data Center Bridging (DCB)