Owner's Manual

Egress QoS

The controller can provide basic egress quality of service (QoS) policies for packets and assign a priority

based on match parameters specified by the controller.

To enable QoS, use one flow to determine the egress port for the packet (for example, an L3 flow) and

another flow such as an ACL flow to determine the egress port for all packets matching the specified

parameters. Using the Set Enqueue action, the controller specifies the egress queue for received

packets matching the specified parameters. You can configure queues and queue rates on individual

ports or for all physical ports in the OF instance.

There are four data queues available, from Q0 to Q3. The minimum rate of a queue is calculated using

the default weights associated with the queue. If you use legacy CLIs, there is no change in the rate. The

following table displays the default weight assigned to each queue:

Queue Number Default Weight Percentage of port line rate

Q0 1 6.67%

Q1 2 13.33%

Q2 4 26.67%

Q3 8 53.33%

After the controller identifies the queues and their rates, it can install flows using the Set Enqueue

command. For example, to send all packets with the source IP address 1.1.1.1 from Queue 0, regardless of

the egress port, the controller creates the following flow:

• Match parameters = Source IP 1.1.1.1

• Action = Set Enqueue

• Queue = 0

Caveats

• Ingress and egress QoS legacy commands are not supported.

• Queues and queue rates are based on default values. You must disable the instance before

configuring queue and queue rates.