This chapter is from the book
QoS Design Steps
While there are two explicit QoS policy requirements of a distribution switch (namely to trust DSCP on ingress and queuing policies), because of the default QoS settings on MQC-based platforms there is effectively only a single step to configuring QoS on a Catalyst 4500 in this role:
Configure the ingress QoS model—which is recommended to be DSCP trust (and which is enabled by default on all MQC-based platforms).
- Configure egress queuing.