Users Guide

priority-group bandwidth pfc
Congure the ETS bandwidth allocation and PFC mode used to manage port trac 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 Congure the priority-group trac to be handled with strict priority scheduling.
Strict-priority trac is serviced rst, before bandwidth allocated to other priority
groups is made available.
pfc {on | o} Congure whether priority-based ow control is enabled (on) or disabled (o) for
port trac in the priority group.
Defaults None
Command Modes DCB MAP
Supported Modes Programmable-Mux (PMUX)
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 congure 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 congure PFC and ETS trac handling for
each priority group in a DCB map.
You can enable PFC on a maximum of two priority queues.
If you congure more than one priority group as strict priority, the higher numbered priority queue is given
preference when scheduling data trac.
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 conguration in a DCB map, enter the no priority-group bandwidth
pfc
command.
Data Center Bridging (DCB)
117