Reference Guide

priority-group
To use with an ETS output policy, create an ETS priority group.
S4820T
Syntax
priority-group group-name
To remove the priority group, use the no priority-group command.
Parameters
group-name Enter the name of the ETS priority group. The maximum is 32
characters.
Defaults none
Command Modes CONFIGURATION
Command History
This guide is platform-specific. For command information about other platforms, refer to the
relevant FTOS Command Line Reference Guide .
The following is a list of the FTOS version history for this command.
Version 8.3.19.0 Introduced on the S4820T.
Version 8.3.12.0 Introduced on the S4810.
Version 8.3.16.0 Introduced on the MXL 10/40GbE Switch IO Module.
Usage
Information
A priority group consists of 802.1p priority values that are grouped 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.
You must configure 802.1p priorities in priority groups associated with an ETS output policy.
You can assign each dot1p priority to only one priority group.
The maximum number of priority groups supported in ETS output policies on an interface is
equal to the number of data queues (4) on the port. The 802.1p priorities in a priority group can
map to multiple queues.
If you configure more than one priority queue as strict priority or more than one priority group
as strict priority, the higher numbered priority queue is given preference when scheduling data
traffic.
You must fully define the priority-group profile with a PGID and priorities before mapping it to a
QoS policy because the PGID and priorities are unique keys of the traffic class group (TCG) that
define the QoS policy.
You must disable the DCB output policy before changing the PGID or priorities of a priority
group assigned to that DCB output policy.
Related
Commands
• priority-list — configures the 802.1p priorities for an ETS output policy.
• set-pgid — configures the priority-group.
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