Cisco Catalyst 3560-X Software Configuration Manual page 933

Chapter 1 Configuring QoS
Queueing and Scheduling on Egress Queues
Figure 1-11
If the expedite queue is enabled, SRR services it until it is empty before servicing the other three queues.
Note
Figure 1-11
(DSCP or CoS value).
Determine egress queue
number and threshold
Queue the packet. Service
the queue according to
Rewrite DSCP and/or
OL-25303-03
and Figure 1-12 show the queueing and scheduling flowcharts for egress ports.
Queueing and Scheduling Flowchart for Egress Ports on Catalyst 3750-X Switches
Start
Receive packet from
the stack ring.
Read QoS label
based on the label.
Yes
Are thresholds
being exceeded?
No
the SRR weights.
CoS value as
appropriate.
Send the packet
out the port.
Done
Drop packet.
Catalyst 3750-X and 3560-X Switch Software Configuration Guide
Understanding QoS
1-19