In a Qumran device, every port has default eight priority queues that can be applied. Whenever QoS feature is enabled, all priority queues of the ports will be configured with certain default egress queuing parameters. To customize the treatment on the priority queues, queuing policy-map infrastructure need to be used.

Service queuing refers to mapping services to specific vlans and shaping each vlan based traffic. Within the vlan, queues can be grouped and shaped independently.

With service queuing, OcNOS can support up to 3 levels of HQoS (hierarchical queuing). The port default queues will continue to work with single level scheduler.