in my WAN three classes of service exists, EF, AF41 and default.
On the ingress of all WAN routers I have the following config:
set dscp ef
set dscp af41
set dscp default
But I still see other traffic classes leaving the WAN interface of that router e.g. AF31, CS6, CS3, CS2
The only one I understand is CS6, as those packets generated by the router itself and therefore not remarked at the ingress.
Also if I check the policy-map, I that not all packets associated with class class-default are remarked (not remarked around 1,5% of all packets).