Administrator Guide

Use the priority-pgid command to map 802.1p priorities to a priority group. You can assign each 802.1p
priority to only one priority group. A priority group consists of 802.1p priority values that are grouped together for
similar bandwidth allocation and scheduling, and that share latency and loss requirements. All 802.1p priorities
mapped to the same queue must be in the same priority group.
Repeat the priority-group bandwidth pfc command to configure PFC and ETS traffic handling for each
priority group in a DCB map.
You can enable PFC on a maximum of two priority queues.
If you configure more than one priority group as strict priority, the higher numbered priority queue is given
preference when scheduling data traffic.
If a priority group does not use its allocated bandwidth, the unused bandwidth is made available to other priority
groups.
To remove a priority-group configuration in a DCB map, enter the no priority-group bandwidth pfc
command.
By default, equal bandwidth is assigned to each dot1p priority in a priority group. Use the bandwidth parameter
to configure the bandwidth percentage assigned to a priority group. The sum of the bandwidth allocated to all
priority groups in a DCB map must be 100% of the bandwidth on the link. You must allocate at least 1% of the
total port bandwidth to each priority group.
dcb-map stack-unit all stack-ports all
Apply the specified DCB map on all ports of the switch stack.
Syntax
dcb-map stack-unit all stack-ports all dcb-map-name
To remove the PFC and ETS settings in a DCB map from all stack units, use the no dcb-map stack-unit
all stack-ports all command.
Parameters
dcb-map-name Enter the name of the DCB map.
Defaults None
Command Modes CONFIGURATION
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
9.7(0.0) Introduced on the S6000-ON.
9.3(0.0) Introduced on the S4810 and S6000 platforms.
Usage Information The dcb-map stack-unit all stack-ports all command overwrites any previous DCB maps applied
to stack ports.
dcb pfc-shared-buffer-size
Configure the maximum amount of shared buffer size for PFC packets in kilobytes.
Syntax
dcb pfc-shared—buffer—size buffer-size
Parameters
buffer-size Enter a number in the range of 0 to 7787.
Default The default is 832KB.
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.
492 Data Center Bridging (DCB)