Administrator Guide

Parameters
priority-group
group-num
Enter the keyword priority-group followed by the number of an 802.1p priority
group. Use the priority-pgid command to create the priority groups in a DCB map.
bandwidth
percentage
Enter the keyword bandwidth followed by a bandwidth percentage allocated to the
priority group. The range of valid values is 1 to 100. The sum of all allocated bandwidth
percentages in priority groups in a DCB map must be 100%.
strict-priority Configure the priority-group traffic to be handled with strict priority scheduling. Strict-
priority traffic is serviced first, before bandwidth allocated to other priority groups is made
available.
pfc {on | off} Configure whether priority-based flow control is enabled (on) or disabled (off) for port
traffic in the priority group.
Defaults None
Command Modes DCB MAP
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.
9.6(0.0) Added support to configure peak and committed rate on the S6000 platform.
9.3(0.0) Introduced on the S4810, S6000 platforms.
Usage Information
Use the dcb-map command to configure priority groups with PFC and/or ETS settings and apply them to
Ethernet interfaces.
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.
C9000 Series
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.
534 Data Center Bridging (DCB)