DELL N3000 User Manual

Configuring Data Center Bridging Features

console(config-if-Te1/0/1)#cos-queue min-bandwidth 20 35 35 10 0 0 0

This step enables strict priority scheduling on one or more CoS queues 

(traffic classes). Strict priority scheduling ensures that packets assigned to a 

higher CoS queue number are serviced before packets assigned to lower CoS 

queue numbers. The strict priority setting does not restrict frame ingress. Use 

the 'no' command to disable strict priority mode scheduling. 
It is recommended that all queues enabled for strict priority scheduling be 

assigned to a single strict-priority-enabled TCG other than TCG0.
The following example sets CoS queue (traffic class) number 3 to be serviced 

with strict priority:

console(config-if-Te1/0/1)#cos-queue strict 3

To show the minimum bandwidth and scheduler modes for CoS queues, use 

the following command.

console#show interfaces cos-queue tengigabitethernet 1/0/1

Interface...................................... Te1/0/1

Interface Shaping Rate......................... 0 kbps

WRED Decay Exponent............................ 9

Queue Id   Min. Bandwidth   Scheduler Type   Queue Management Type

--------   --------------   --------------   ---------------------

0          20               Weighted         Tail Drop

1          35               Weighted         Tail Drop

2          35               Weighted         Tail Drop

3          10               Strict           Tail Drop

4          0                Weighted         Tail Drop

5          0                Weighted         Tail Drop

6          0                Weighted         Tail Drop

In this step, CoS queues are mapped to Traffic Class Groups (TCGs). Since 

TCGs are serviced from highest numbered TCG to lowest, higher priority 

traffic should be assigned to higher numbered TCGs. In general, strict