Use QoS policies in hardware rather than in software whenever possible.
Classify, mark, and police applications as close to the source as possible.
Use DSCP marking whenever possible.
Define a queue for the traffic class and enable queuing on each node that has potential congestion.
Limit the strict-priority queue to one-third of the link bandwidth.
Do not use WRED for priority or scavenger traffic classes.
Use one of the three QoS strategy models to govern end-to-end QoS design.