Realization Of Traffic Engineering And Research On Constraint-based Routing Based On GMPLS

With the explosive growth of IP services, the traditional optical network has been difficult to adapt to modern network and meet the need of expanding fashionable business. As the most promising optical network, ASON (Automatic Switching Optical Network) does not only provide customers with faster speed, more flexible networking modes,as well as the more intelligent network management, which is very satisfied with customers' needs.GMPLS is the core technology to achieve the control plane of ASON, which is an extension of MPLS to optical networks, and it's a sublimation and elevation for MPLS, which is specifically applied to realize the control plane of ASON. GMPLS inherits almost the property and protocols of MPLS; it does not only support PSC node, but also Non-PSC node. GMPLS can provide network resource dynamically, make use of bandwidth more effectivly and implement the protection and recovery of network.According to MPLS protocol, the thesis does the following research on traffic engineering and Constraint-based routing of GMPLS network based on the analysis of key technologies on GMPLS.Firstly, in this paper, the network structure of the GMPLS Traffic Engineering is divided into two parts: management cell and forwarding cell. Forwarding cell is the part carrying out the specific operating on data forwarding in the LSR. Management cell is the most important part in the GMPLS Traffic Engineering structure, and it is constructed of signal part and constraint-based routing part,which establishes and maintains the control information. It can be foreseen that the future backbone network will become the all-optical network which is more effective, more powerful by the large-scale application of the GMPLS technique. It is of the utmost importance to research and discuss the realization of the GMPLS Traffic Engineering in this background.Secondly, Constraint-based routing on GMPLS network is used to select the requested LSP, meet quality requirements while making full use of network resources, improve utilization of network resources. This thesis introduces the designation and realization of CSPF algorithm in the optical network; it proposes the cutting algorithm, as well as the interactions among CSPF module, OSPF module and TE module. Being based on considering link status, cost and bandwidth, we emulate the algorithm on the emulating platform GLASS. The results show the CSPF can interactive linkstate information and topology information quickly, reduce the Re-routing time and improve communication efficiency greatly, and realize the function of protection and recovery effectively.Finally, on the operating platform of VTP, the paper holds on system test on GMPLS TE and CSPF mechanism, the results shows the design can improve the utilization of network resources effectively, optimize the network traffic distribution, which is very satisfied with users' needs.