Prioritize QinQ inner VLAN traffic over the other

Hi,

For a customer of mine I have configured QinQ with two inner VLANs: 6 for Internet and 7 for VOIP. I need to give priority to inner VLAN 7 over 6. How do i do that? Should I apply an output filer for both QinQ interfaces or some sort of policer?

The QinQ interfaces:

unit 5373 {            
    vlan-tags outer 0x8100.373 inner 0x8100.6;
    family inet {
         address 1.1.1.0/30;
    }
}
unit 5374 {
    vlan-tags outer 0x8100.373 inner 0x8100.7;
    family inet {
        address 2.2.2.0/30;
    }
}

Greetings,

Marijn