Research Of The Technology About Generalized Multi-Protocol Label Switching (GMPLS)

GMPLS is developed from MPLS GMPLS, in which time slots, wavelengths and optical fiber physical ports are used as labels for corresponding data transmit, is the inevitable result of MPLS extending to optical networks.By the extended signaling protocols,routing protocols and new link management protocols,GMPLS satisfies the requests of intelligent optical networks control automatically and signaling , and so provides dynamic networks resource and improves survivability.With the rapid increase of Internet, the network traffic is growing accordingly. How to manage and control the burst and unexpected traffic load to avoid congestion is a hot issue in current researches. Now Traffic Engineering (TE), which mainly concerns the optimization of network performance,becomes more and more important in Internet,whose objective is to make the operation of network efficient and reliable,and to optimize network resources. The current technology of traffic engineering is built on IP over ATM, which becomes outdated due to new network communication technology's appearing and developing. It is exigent for ISPs to seek a kind of new technology to replace its current functions without its inherent complexity to administrate and extend. GMPLS has many characteristics for lessening congestion and balancing load and presents a new path to implementing TE.This study is a part of the GMPLS research project charged by the researchgroup of "WDM-based Multi-Service ASON". A solution for traffic engineering design based on GMPLS is demonstrated in this study. The solution is based on the analysis of the technical theory, implementation mechanism and core technology of GMPLS and featured in its constraint-based routing. By using the expansion andcombination of the existing protocols, the solution composes of 4 parts: packet forwarding module, information distribution module, path selection module and signaling module. The solution is featured in its modularized design, with every single function unit as an independent module and an open interface between the 4 modules. The modularized combination and open interface would be used to satisfy the need for a further optimization of every single module with the development of technology.A study on signaling mechanism in GMPLS traffic engineering is also provided here. A deep analysis and comparison between the two different signaling process RSVP-TE and CR-LDP is given, providing a theoretical standard for operators in their choice of signaling protocols.