Users Guide

ManualsBrandsDell ManualsComputer equipmentPowerEdge M IO Aggregator

To enable DCB with PFC buffers on a switch, enter the following commands, save the configuration, and

reboot the system to allow the changes to take effect.

1. Enable DCB.

CONFIGURATION mode

dcb enable

2. Set PFC buffering on the DCB stack unit.

CONFIGURATION mode

dcb stack-unit all pfc-buffering pfc-ports 64 pfc-queues 2

NOTE: To save the pfc buffering configuration changes, save the configuration and reboot the

system.

NOTE: Dell Networking OS Behavior: DCB is not supported if you enable link-level flow control on

one or more interfaces. For more information, refer to Flow Control Using Ethernet Pause Frames.

Configuring DCB Maps and its Attributes

This topic contains the following sections that describe how to configure a DCB map, apply the

configured DCB map to a port, configure PFC without a DCB map, and configure lossless queues.

DCB Map: Configuration Procedure

A DCB map consists of PFC and ETS parameters. By default, PFC is not enabled on any 802.1p priority

and ETS allocates equal bandwidth to each priority. To configure user-defined PFC and ETS settings, you

must create a DCB map.

Step Task Command Command Mode

Enter global configuration mode to create a

DCB map or edit PFC and ETS settings.

dcb-map name

CONFIGURATION

Configure the PFC setting (on or off) and the

ETS bandwidth percentage allocated to traffic

in each priority group, or whether the priority

group traffic should be handled with strict

priority scheduling. You can enable PFC on a

maximum of two priority queues on an

interface. Enabling PFC for dot1p priorities

makes the corresponding port queue lossless.

The sum of all allocated bandwidth

percentages in all groups in the DCB map

must be 100%. Strict-priority traffic is serviced

first. Afterwards, bandwidth allocated to other

priority groups is made available and allocated

according to the specified percentages. If a

priority group does not use its allocated

bandwidth, the unused bandwidth is made

available to other priority groups.

Example: priority-group 0 bandwidth 60 pfc

off priority-group 1 bandwidth 20 pfc on

priority-group

group_num {bandwidth

percentage | strict-

priority} pfc {on | off}

DCB MAP

Data Center Bridging (DCB)