There are a lot of things that you will have to do on the switch for using it to implement certain QoS.
Firstly, the marking of the bits in the ip header doesnot tell the switch how to treat them. you will have to configure the switch to treat different values to be treated the way you want.
So you will have to enable Qos globally on the 4500, and then configure the port to "trust" the incoming markings. By default the markings wont be trusted and the switch will over-write them with the default.
you can then map the values to and others if you want, or just leave them a they are. Then you will have to configure the treatement for the different values using queueing/ policing etc.
please refer to the following guide to configure the device for qos, or refer to the config guide of the ios release you are using:
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