  The highly dynamic nature of the current network traffics, makes the network
managers to exploit the flexibility of the state-of-the-art paradigm called
SDN. In this way, there has been an increasing interest in hybrid networks of
SDN-MPLS. In this paper, a new traffic engineering architecture for SDN-MPLS
network is proposed. To this end, OpenFlow-enabled switches are applied over
the edge of the network to improve flow-level management flexibility while MPLS
routers are considered as the core of the network to make the scheme applicable
for existing MPLS networks. The proposed scheme re-assigns flows to the
Label-Switched Paths (LSPs) to highly utilize the network resources. In the
cases that the flow-level re-routing is insufficient, the proposed scheme
recomputes and re-creates the undergoing LSPs. To this end, we mathematically
formulate two optimization problems: i) flow re-routing, and, ii) LSP
re-creation and propose a heuristic algorithm to improve the performance of the
scheme. Our experimental results show the efficiency of the proposed hybrid
SDN-MPLS architecture in traffic engineering superiors traditionally deployed
MPLS networks.
