Data Center Bridging (DCB) | 127
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.
To create a priority group for ETS, follow these steps:
Step Task Command Command Mode
1 Create an ETS priority group to use with an ETS
output policy. Maximum: 32 characters.
priority-group group-name
CONFIGURATION
2 Configure the priority-group identifier.
Valid values: 0 to 7. Default: None.
set-pgid value
PRIORITY-GROUP
3 Configure the 802.1p priorities for the traffic on
which you want to apply an ETS output policy.
Valid values: 0 to 7.
Default: None.
Separate priority values with a comma; specify a
priority range with a dash; for example:
priority-list 3,5-7.
priority-list value
PRIORITY-GROUP
4 Exit priority-group configuration mode.
exit
PRIORITY-GROUP
5 Repeat Steps 1 to 4 to configure all remaining dot1p priorities in an ETS priority group.
FTOS Behavior:
A priority group consists of 802.1p priority values that are grouped together for similar bandwidth
allocation and scheduling, and that share the same latency and loss requirements. All 802.1p priorities
mapped to the same queue should be in the same priority group.
All 802.1p priorities should be configured in priority groups associated with an ETS output policy (refer
to Applying an ETS Output Policy for a Priority Group to an Interface). You can assign each dot1p
priority to only one priority group.
By default:
- All 802.1p priorities are grouped in priority group 0.
- 100% of the port bandwidth is assigned to priority group 0. The complete bandwidth is equally
assigned to each priority class so that each class has 12 to 13%.
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.
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