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Large scale networks are still a major challenge for management, guarantee a good level of Quality of Service (QoS) and especially optimization (rational use of network resources). Multi-Protocol Label Switching (MPLS), mainly used in the backbone of Internet service providers, must meet these three major challenges. Software-Defined Network (SDN), is a paradigm that allows, through the principle of orchestration and layers abstraction, to manage large scale networks through specific protocols. This paper presents a new SDN-based architecture for managing an MPLS Traffic Engineering Diffserv Aware (DS-TE) network. The architecture manages the QoS and routing with QoS constraints, following a new smart and dynamic model of allocation of the bandwidth (Smart Alloc). The proposed architecture is suitable for SDN equipment and especially the legacy equipment. We tested our architecture by simulation …