Every physical port of a Qumran device has eight priority queues and every subinterface has four priority queues. These ports and subinterfaces can be applied with several egress QoS parameters – these will be discussed in the next sections. (For more about subinterfaces, see Chapter 21, Subinterface Queuing.) When the QoS feature is enabled, all priority queues of the ports are configured with certain default egress queuing parameters.

To customize the treatment on the priority queues, the queuing policy-map infrastructure needs to be used. The following section explains the basic configuration details involved to apply queue level treatment on a port.