Research And Implementation Of L1 VPN Key Technology In Multi-Domain Optical Networks

Providing new types of broadband, high-quality, dynamic, flexible and controllable services directly in optical networks represent the feature of next generation optical networks. The introduction of ASON adapted control plane has resolved the connection-oriented problem. It can achieve a point-to-point Dynamic light path Provisioning through automatic detection and automatic building or tearing down. However the service-oriented optical network also needs the support of a plane, the emergence of service plane is driven by the service-oriented network. At the same time, Layer 1 Virtual Private Networks (L1 VPNs) which is one of the potential value-added services of intelligent optical networks can provide customers with predictable and secure network connections over a shared physical optical WDM network. The outstanding features of L1 VPN including economization, flexibility, reliability, security and scalability have made L1 VPN a win-win solution for both internet service providers (ISPs) and users.Some studies have considered the design and performance evaluation of L1 VPN in single domain and detailed architectural proposals were also proposed in standard bodies (e.g., ITU-T SG 13 and IETF L1 VPN WG). However, multi-domain L1 VPNs design is significant in practical large-scale optical networks. In multi-domain optical networks, the resource reservation of L1 VPN is complex and it may prove difficult if we use a fixed provisioning architecture to satisfy the diverse service requests. At present, L1 VPN network design in multi-domain optical networks has not been studied comprehensively.The first chapter of this article analyses of transition from technology-driven to services-driven; gives a brief introduction of the architecture of ASON and AMSON.The second chapter mainly researches the L1 VPN's background and related theories and describes the requirements, features, networking technology, application and dominant position of L1 VPN services.The third chapter analyses of the L1 VPN service provisioning characteristics in multi-domain optical networks on the basis of existing resources demand models on the one hand; the other hand proposes two kinds of topological constructing algorithms; complete the simulation in order to evaluate the performance and verify the feasibility of the proposed architecture.The forth chapter gives the details of functional framework Design, module design and software implementation of multi-domain.The fifth chapter gives a brife introduction about the AMSON testbed. Results are showed and explained finally.The last chapter contains the summary of the article.