Label Assignment In GMPLS-Controlled Multiservice Transport Network

With the increase and the development of high-speed optical network, the network performance such as network bandwidth, extensibility is evolved to adapt to new business. Some new network technologies are proposed continually. MPLS (Multi-Protocol Label Switch) is one new type of network technologies. It combines both IP routing and ATM (Asynchronous Transfer Mode) switching technologies. MPLS fully utilizes the high-performance hardware switching of ATM as well as providing the intelligence of IP routing. GMPLS (General Multi-Protocol Label Switch) is the extension of MPLS toward optical network. It inherits almost all of the characteristic and protocols in MPLS, realizes the combination of IP and Optical network, and makes label supporting packet switching together with Package Switch Capable, Time Division Multiplex Capable, Lambda Switch Capable and Fiber Switch Capable. GMPLS also improves and supplies signal instruction and routing protocols to realize the whole intelligent of optical network.The kernel functions of MPLS are classifying the group, adding label to the group according as different type, establishing the LSP, transport the group on the LSP according to the label in MPLS network subsequently. These problems are resolved by LDP (Label Distribution Protocol), the core of MPLS. LDP is the set of procedures and messages by which LSR (Label Switched Routers) establish LSP through a network by mapping network-layer routing information directly to data-link switched paths.In this thesis, we firstly analysed GMPLS-controlled intelligent optical network structure and management, and investigated the label format and main protocols in GMPLS-controlled all optical network. Particularly, we discussed the technology of label switching in GMPLS-controlled all optical networks and analyzed the broadly adopted network management technology and existent issues using Lambda Switch Capable. Furthermore, in this thesis, We analyzed the existing SDH technology, expecially the application of its contiguous concatenation and virtual concatenation technology in GMPLS network, proposed a new label assignment scheme in the network which uses SONET/SDH devices as optical network nodes and analyzed the efficiency when using this scheme to setup LSP by simulation and emulation.The proposed scheme has been evaluated in a real GMPLS emulation platform which was used for the GMPLS protocols testing.