What is the interface to the ASR - is it a trunk or L2/L3 port?
I have a trunk port with ethernet sub-interfaces. On the sub-interface I care about - I have a service-policy input on the interface that marks traffic w/ IP Prec according to how our provider requires them to place in the proper queue's across the MPLS backbone. The applications I care about do not mark - and even if they did - I wouldn't trust them. Anyway it looks something like this (very simple):
class-map match-any real-time
match access-group name real-time
class-map match-any enterprise-apps
match access-group name enterprise-apps
set ip precedence 4
set ip precedence 1
set ip precedence 0
encapsulation dot1Q 560
ip vrf forwarding global
ip address 255.255.255.224
service-policy input setTOS
This works well. But I also know that the ASR should honor marking as they come in. That's where I think this doc / CCO link comes in
aspeg-casr-01(config-subif)#plim qos input map cos enable
aspeg-casr-01(config-subif)#plim qos input map cos 5 queue strict-priority
Per your requirements. That schedules packets with cos 5 ahead of the line for processing in the ESP...read the link above for theory of packet processing w/ QoS on the ASR. You'd still need to apply an outbound service policy via MQC if you want to prioritize outbound traffic.
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