We can use a combination of QoS group and discard class here. We have following behavior of DC in NCS5501:
1. Conform: DC is set to 0
2. Exceed: DC is set to 1
3. Violate: This is always drop. We cannot do any action for Violate case.
For the current configuration we can use a combination of qos-group and discard class in ingress to mark the conformed and exceeded traffic. qos-group here will help to distinguish between classes.
In the egress, we can set mpls exp based on qos-group and DC value. The configuration will be something like this:
Ingress:
policy-map PMAP_I
class CLASS_RT_INGRESS
set qos 5
police rate percent 30 peak-rate percent 100
class CLASS_SIG_INGRESS
set qos 4
police rate percent 10 peak-rate percent 100
class class-default
set qos 0
police rate percent 35 peak-rate percent 90
egress:
policy-map PMAP_E
class dc0_qos5
set mpls exp 5
class dc1_qos4
set mpls exp 1
class dc0_qos4
set mpls exp 4
class dc1_qos4
set mpls exp 0
class dc0_qos0
set mpls exp 0
class dc1_qos0
set mpls exp 1
Let me see if I can find out a lab to test this, but this should work fine.
