I can't understant very well which is the mechanism of marking the Internal DSCP of the Multilayer swicth in the PE MPLS. Take a look of theese two cases and the questions related:
FIRST CASE: upstream
R1 is a 6500 PE device enabled qos and the IP packet goes in the ingress interface (configured to eas trust cos) dscp=ef and Cos=2. In this case the cos should be used in order to build the Internal-dscp. Does then the Internal-dscp used to mark the EXP of the out going packet leaving the original dscp end may be also the CoS?
Outgoing MPLS packet: dscp=ef, exp=2, exp=2, cos=2 Is this correct or not? In this case the dscp is not remarked and still remain ef?
SECOND CASE: Downstream
R1 is the same 6500 PE device as before. The MPLS packet is returning now coming into another interface (configured for trusting exp). The MPLS packet has just the transport label and the QoS is: dscp=ef, exp=3 and Cos=2. In this case the exp should be used in order to build the Internal-dscp. Does then the Internal-dscp used to mark the cos and maybe also the dscp of the outgoing packet toward teh access.?
So your first case analysis is correct and for the second case the DSCP field will be preserved as well. One exception is for aggregate label. In this case, the IP ToS will be set to the internal DSCP during the MPLS2IP operation.
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