QoS egress scheduling

QoS egress scheduling works under the following rules, restrictions, and limitations:

You must use a credit request/grant mechanism to perform egress scheduling QoS.
The maximum credit size is 1024 Bytes.
For each egress port there are 8 Virtual Output Queues (VOQs) allocated on each ingress transmit module (TM) core to support 8 priorities.
Egress scheduling supports strict priority (SP), weighted fair queue (WFQ), and mixed mode scheduling.
You can specify weighted for each VOQ only in WFQ mode.
Fair queue (FQ) scheduling between VOQs from different TMs and with the same priority is permitted.

The figure below illustrates a QoS egress scheduling scheme.

In the figure above P1 is the insight interface.

See the topic Configuring QoS egress scheduling for configuration information.