A novel QoS routing scheme for MPLS traffic engineering

Emergence of MPLS facilitates the implementation of traffic engineering. The aims of traffic engineering are to satisfy diversified QoS requirements and optimize network performance. QoS routing is an essential component of traffic engineering in MPLS networks. In this paper, we propose a bandwidth constrained QoS routing scheme with additional traffic engineering objectives (BCTE) used to establish bandwidth guaranteed LSPs in MPLS networks. The traffic engineering objectives considered in our routing scheme are to reduce call blocking probability and to balance network traffic load. To this end, we apply the max-flow problem and introduce a new metric named path saturation to out routing scheme. The simulation results show that, by taking traffic engineering objectives into account, our proposed bandwidth constrained QoS routing scheme outperforms widest-shortest path (WSP).