Research About QoS By MPLS Traffic Engineering In DCN Network

DCN is enterprise computer network of Shandong Unicom. It is consist of Business support system, Operation support system and Management Support System. It is required to guarantee substantial business's Qulity of Service, according to the merge of CNC and Unicom and constant information systems constructing.DS-TE which combines the advantage of DiffServ and MPLS Traffic Engineering is the most perfect choice of QoS's deployment in DCN. This paper discusses detailedly the deployment of DS-TE in DCN.When the link which connects headquarter and branch fails,the original path selection process will affect the substantial business.This paper introduce a different path selection process - dynamically rent bandwidth during failure events.It allows the tunnel preemption between bandwidth constraint to ensure the building of the high priority tunnel during failure events.This path selection process can satisfy the QoS requirement in DCN by analyzing and comparison.It can guarantee the QoS of substantial business.