Configuring queue service
A packet can be placed in one of eight different queues. Each of the eight queues is mapped to one of the eight QoS levels, and the queues are serviced using a guaranteed Weighted Round Robin mechanism as follows:
- Queue 7 is reserved for network control traffic.
- Queue 6 has the highest transmit opportunity and absolutely must be serviced and routed, with Queue 0 traffic transmitted as time allows.
| For example, voice and video traffic are placed in Queue 6 because it must go through without delay, and Web surfing traffic could be placed in Queue 1 because of its low priority and tolerance of delay. |
After the packets are placed in the queues, the queues are serviced according to the Weighted Round Robin mechanism. Each queue level can be assigned up to 32 timeslots, or packet transmit opportunities (PTOs). When the packet transmit opportunity allocated to a particular timeslot arrives and the level contains data, it is serviced. If two queues contain data and their timeslots arrive simultaneously, the queue with the higher queue number is serviced first. Thus, each of the eight queues can be configured with up to 32 packet transmit opportunities. For each port, every queue level can be configured to own any, all, or none of the packet transmit opportunities.
See also
