Dell Networking N4000 Series Configuration Manual page 1006

priority traffic (typically control plane or low bandwidth, low latency traffic) is
assigned the highest numbered TCG. It is recommended that WDRR queues
be assigned to TCG0.
The mapping may be configured on a single interface, a range of interfaces, or
all the interfaces.
It is required that TCGs always be assigned in order from 0 to 2. It is further
recommended that the operator always utilize consecutive TCGs starting
with TCG 0; for example, use TCG 0 and 1 vs. TCG 0 and 2 only.
This example assigns best effort traffic to TCG 0, lossless traffic to TCG 1,
and expedited service traffic to TCG 2.
console(config-if-Te1/0/1)# classofservice traffic-class-group 0 0
console(config-if-Te1/0/1)# classofservice traffic-class-group 1 1
console(config-if-Te1/0/1)# classofservice traffic-class-group 2 1
console(config-if-Te1/0/1)# classofservice traffic-class-group 3 2
To show the CoS queue to TCG mapping, use the following command:
console#show classofservice traffic-class-group tengigabitethernet
1/0/1
Traffic Class
-------------
0
1
2
3
4
5
6
6. Set the Weight for Each TCG
This step configures the scheduling weight for each TCG. The weight
percentage configures the scheduler to ensure that each TCG is nominally
serviced in the ratio specified.
Each WDRR TCG should be assigned a nonzero weight. Weights may be
configured on a single interface, a range of interfaces, or all interfaces, and
must sum to 100%. It is recommended that strict priority TCGs be assigned a
weight of 0%, since they are processed first and ignore the configured TCG
weight.
1006
Configuring Data Center Bridging Features
Traffic Class Group
------------------
0
1
1
2
0
0
0