Reference Guide

The configuration of bandwidth allocation and strict-queue scheduling is not supported at the same time for a priority
group. If both are configured, the configured bandwidth allocation is ignored for priority-group traffic when you apply
the output policy on an interface (refer to Applying an ETS Output Policy for a Priority Group to an Interface).
Bandwidth assignment in a dot.1p priority-queue: By default, equal bandwidth is assigned to each port queue and each
dot1p priority in a priority group. To configure bandwidth amounts in associated dot1p queues, use the bandwidth-
percentage command. When specified bandwidth is assigned to some port queues and not to others, the remaining
bandwidth (100% minus assigned bandwidth amount) is equally distributed to unassigned nonstrict priority queues in the
priority group. The sum of the allocated bandwidth to all queues in a priority group should be 100% of the bandwidth on
the link.
Bandwidth assignment in a priority group: By default, equal bandwidth is assigned to each priority group in the ETS
output policy applied to an egress port if you did not configure bandwidth allocation. The sum of configured bandwidth
allocation to dot1p priority traffic in all ETS priority groups must be 100%. Allocate at least 1% of the total bandwidth to
each priority group and queue. If you assign bandwidth to some priority groups but not to others, the remaining
bandwidth (100% minus assigned bandwidth amount) is equally distributed to nonstrict-priority groups which have no
configured scheduler.
Scheduling of priority traffic: dot1p priority traffic on the switch is scheduled to the current queue mapping. dot1p
priorities within the same queue should have the same traffic properties and scheduling method.
ETS output-policy error: If an error occurs in an ETS output-policy configuration, the configuration is ignored and the
scheduler and bandwidth allocation settings are reset to the ETS default values (all priorities are in the same ETS priority
group and bandwidth is allocated equally to each priority). If an error occurs when a port receives a peer’s ETS
configuration, the port’s configuration is reset to the previously configured ETS output policy. If no ETS output policy was
previously applied, the port is reset to the default ETS parameters.
Creating an ETS Priority Group
An ETS priority group specifies the range of 802.1p priority traffic to which a QoS output policy with ETS settings is
applied on an egress interface. You can associate a priority group to more than one ETS output policy on different
interfaces.
1. Create an ETS priority group to use with an ETS output policy.
CONFIGURATION mode
priority-group group-name
The maximum is 32 characters.
2. Configure the priority-group identifier.
PRIORITY-GROUP mode
set-pgid value
The range is from 0 to 7.
The default is none.
3. Configure the 802.1p priorities for the traffic on which you want to apply an ETS output policy.
PRIORITY-GROUP mode
priority-list value
The range is from 0 to 7.
The default is none.
Separate priority values with a comma. Specify a priority range with a dash. For example, priority-list 3,5-7.
4. Exit priority-group configuration mode.
PRIORITY-GROUP mode
exit
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