Diffsevr classifies the classes of service to define the Per-Hop-Behavior of traffic; while Traffic Engnineering optimizes the forwarding paths. Diffsevr-aware MPLS Traffic Engnineering combines the MPLS Diffsevr and Traffic Engnineering. So they are aware of the existence of each other. Diffsevr-aware Traffic Engnineering(DS-TE) introduces the concept of class-based resource allocation
which sets up fine granularity switching paths to further guarantee the quality of service