DELL N3000 User Manual

Configuring Class-of-Service

mapping from the switch defaults to support lossless

1

 transport of frames on 

CoS queue 4, with a 50% minimum bandwidth guarantee. Lossless traffic 

classes generally use the default WRR scheduling mode as opposed to strict 

priority, to avoid starving other traffic. For example, the following commands 

assign user priority 4 to CoS queue 4 and reserve 50% of the scheduler 

bandwidth to CoS queue 4. This implies that, when the switch is congested, 

the scehduler will service CoS queue 4 fifty percent of the time to the 

exclusion of all other CoS queues, including higher-priority CoS queues.

classofservice dot1p-mapping 4 4

cos-queue min-bandwidth 0 0 0 0 50 0 0

1. Lossless behavior is guaranteed only when configured in conjunction with a conges-

tion control mechanism such as PFC.