Question about 3750 mls qos map dscp-output-q and cos-output-q

1. If a egress packet has both Cos and Dscp setting, which map should this packet used to put into queue?
2. The 3750 is doing ip route. After the packet is routed, will the packet keep the DSCP and COS? Or it will just keep the DSCP and using the dscp-cos map to create a new COS.

Apologies for the confusion with the terminalogy.
The question is where you have configured the trust boundaries, do you necessarily trust the DSCP value prior to being routed across your network?
Therefore, although you have explicity trusted the DSCP value, do you still trust the value at the remote peer.
For example, you connect into an MPLS with QoS enabled, you know that the values you are trusting are correct within your network, however at the remote peer/branch they could be remarked by the provider. Therefore do you 'believe' the values, or do you simply not trust them and then reclassify on ingress.
Regards
Allan.
Hope this makes sense..

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    Are these statements correct ?
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      - downstream wmm traffic will be policed down to "?" (this one I'm not sure, is it "not policed" or "policed down to cos 6 for platinum, etc")
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      - use "mls qos trust dscp" on the WLC trunk port if you want LWAPP traffic COS/DSCP to reflect original DSCP setting and if you want to leave DSCP alone in the outgoing upstream traffic
    Ans:
    3. With either "mls qos trust cos" or "mls qos trust dscp" on WLC trunk port, downstream wmm traffic will be policed down to "wired qos protocol" setting (What if "wired qos protocol" is not set, will it be policed down to, for example, cos 6 for Platinum?)
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       Use "mls qos trust cos" on HREAP AP ports, if you want to QoS profile 802.1p to override upstream DSCP for locally switched WLANs
    Ans:
    5. Use either "mls qos trust dscp" or "mls qos trust cos" on switch-to-switch trunks
    Ans: I think on purely layer 2 switches you can trust dscp, but am not 100% sure.

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