Hello, I have a VSS 4560 Switches on a Site 1, and a 7200 on SIte 2. I need to configure QoS for VoIP traffic between the 2 Sites. I applied this configuretion on each port of the access swiches 3560 POE :
switchport priority extend trust
mls qos trust cos
switchport voice vlan dot1p
switchport access vlan x
switchport mode access
switchport voice vlan 173

The problem for me is this: the configuration above is for Layer 2 QoS with 802.1p, I need to know how to configure QoS on layer 3 so that the Layer 2 configuration is translated on layer 3 while packets are sent between the 7200 on Site 1 and the VSS switches 4560 on Site 2!
Can you help me please?