Gmpls Core. Optical Network Forwards The Consideration Of Modular Design And Traffic Engineering To Achieve

Typically, the traditional data network mainly includes four layers: IP,ATM,SONET/SDH,DWDM。And the future data and transmission networks will consist of elements such as routers, switches, DWDM systems, Add-Drop Multiplexors (ADMs),photonic cross-connects (PXCs) or optical cross-connects (OXCs). To dynamically provision resources and to provide network survivability using protection and restoration techniques, it is very urgent to seek for a perfect resolvent.The premise of multiprotocol label switching(MPLS) is to speed up packet forwarding and provide for traffic engineering in Internet protocol (IP) networks. To accomplish this, the connectionless operation of IP networks becomes more like a connection-oriented network where the path between the source and the destination is precalculated based on user specifics. In the end ,the network will develop to IP over DWDM with GMPLS. Generalized MPLS (GMPLS) extends MPLS to optical networks. GMPLS can provide the control plane(signaling and routing) for devices that switch in any of these domains: packet,time, wavelength, and fiber. This common control plane promises to simplify network operation and management by automating end-to-end provisioning of connections, managing network resources, and providing the level of QoS that is expected in the new, sophisticated applications.This tutorial focuses on the issues that GMPLS resolves in providing a common control plane to operate across dissimilar network types (e.g., packet, time division multiplexing [TDM], and optical).Nowadays, the workgroups of IETF are engaged in research on GMPLS criterion, signaling protocal and routing extends.Initially, an overview of current communication network and optical network technology is given.Then the chapter analysises the architecture and principle of MPLS and GMPLS. Also included is a discussion of the goals of GMPLS, resource discovery, topology/state information dissemination, path selection & link management, routing and LSP hierarchy issues; signaling, protection and restoration issues; and future functionality.Next, the author provides GMPLS Forwarding as an important part of GMPLS, analysises its function and structure,and put forward design scheme. In the end, introduce of Traffic Engineering and constraint routing is then presented,and provide design model and algorithm.