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Dell PowerEdge FN I/O Module Command Line Reference Guide 9.10(0.0)

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priority-group bandwidth pfc

Configure the ETS bandwidth allocation and PFC mode used to manage port traffic in an 802.1p priority group.

Syntax

priority-group group-num {bandwidth percentage| strict-priority} pfc {on | off}

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

Supported Modes

Programmable-Mux (PMUX)

Full–Switch

Command History

Version	Description
9.9(0.0)	Introduced on the FN IOM.
9.4(0.0)	Supported on the FN I/O Aggregator.
9.3(0.0)	Introduced on the FC Flex IO module installed in the M I/O Aggregator.

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.

Related Commands

priority-pgid – Configures the 802.1p priority traffic in a priority group for a DCB map.