I have a client who has forwarded there config for a 4500 router and asked wether QoS is actually doing anything with the applied configuration, relevant parts shown below:-
qos map cos 4 to dscp 34
qos map cos 5 to dscp 46
class-map match-all Trusted_Device-1-class
match access-group name Trusted_Device-1
switchport trunk encapsulation dot1q
switchport mode trunk
qos trust cos
service-policy input Trusted_Device-policy
As far as I can see the policy is only saying "TRUST DSCP MARKINGS" but nothing else.
With QoS enabled, what is the default queuing method, and would the above be enough to prioritise VOIP traffic using IP5 or DSCP46.