If you have detailed information on how the customer wants QoS to be implemented on the access links (links between PE and CE) you can use short pipe mode, which means basically applying on the PE the exactly same configuration that the customer has on the CE.
Otherwise, you will use pipe mode, and apply QoS policies similar to the ones applied on the rest of the network.
If you would like to preserve your customer's marking, that is a great reason to go for the UNIFORM Model where the customer's IP Precedence/DSCP bits are copied to MPLS EXP bits at the ingress. At the egress, you (as a SP) copy the EXP bits back to IP header's IP Precedence or DSCP bits.
The difference between pipe and short-pipe is that, on the egress LSR (LER), the pipe model still uses the MPLS EXP value (of the MPLS label) on the service-policy (as match criteria) while the short-pipe uses the the IP Precedence / DSCP (on the IP packet) on the service-policy.
Short-pipe allows for more QoS granularity on the accesses facing the CPE's, if DSCP is used (6 bits of the DSCP against 3 bits of the MPLS EXP). Other than that, they are similar...
The Uniform model is not used often, because it implies possible remarcation of the ToS byte of the original IP packet header (thus, messing up the customer's own QoS policy). The Uniform model is, however, the only possible model on a non-MPLS backbone.
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