Availability-aware design for generalized MPLS networks

Internet服务用户，包括企业和一般最终用户，期望其服务提供商提供高可用性的Internet连接。在动态通用多协议标签交换（GMPLS）网络中，保证每个连接的端到端（E2E）可用性一直是一个有吸引力的设计目标。以往在相关领域的研究工作主要集中在给定保护类型下的单次或双次同时故障的生存路由方案的开发。然而，随着通信运营商网络向多业务带宽发放环境发展，每个LSP的端到端可用性已经成为最终用户能否感受到QoS （Quality-of-Service）保证的主要性能指标。这一事实对生存性路由和备用容量分配方案的发展产生了根本性的影响，因为最终用户可能并不关心运营商可以处理多少同时发生的故障，以及运营商采用哪种类型的保护方案。在观察结果的推动下，该项目致力于研究GMPLS网络中实时和非实时服务的通用可用性感知服务供应体系结构，其中每个连接的长期和短期端到端可用性将被定义和操纵。在可用性模型的基础上，对报告的生存路由和备用容量分配方案进行了相应的改进。提出的研究设想提供一个完整的解决方案，可生存的路由问题，留下一些以前的设计问题，如“多少同时故障的载体可以处理”，“我们最好采用哪种类型的保护方案”，不再是问题。这种可生存路由体系结构能够更好地适应现代通信载波网络的设计要求，在这种网络中，服务可用性是冗余投资和可生存性保证的最终目标。该项目还将导致HQP在可用性分析和优化技术方面的培训，这将对加拿大通信行业做出巨大贡献。

The Internet service subscribers, including both enterprises and general end users, expect for high availability of Internet connections from their service providers. Guarantee of end-to-end (E2E) availability for each connection in dynamic Generalized Multi-Protocol Label Switched (GMPLS) networks has been an attractive design objective. The previous research work in the related areas has focused on development of survivable routing schemes for single or dual simultaneous failures under a given type of protection. However, as the state-of-the-art communication carrier networks evolve to a multi-service bandwidth provisioning environment, the E2E availability of each LSP has become a major performance index for achieving Quality-of-Service (QoS) guarantee percieved by the end users. This fact has imposed a fundamental impact on the development of survivable routing and spare capacity allocation schemes since the end users may not care about how many simultaneous failures the carrier can handle, and what type of protection scheme the carrier adopts. Driven by the observations, this project is committed to work on a general availability-aware service provisioning architecture in GMPLS networks for both real-time and non real-time services, where the long-term and short-term E2E availability of each connection will be defined and manipulated. Based on the availability models, the corresponding enhancement on the reported survivable routing and spare capacity allocation schemes will be investigated. The proposed research is envisioned to provide a complete solution to survivable routing problems by leaving some of the previous design issues, such as "how many simultaneous failures the carrier can handle", and "what type of protection scheme we had better adopt", no longer as problems. Such survivable routing architecture is expected to better fit into the design requirements of modern communication carrier networks where service availability is the ultimate goal of redundancy investment and survivability guarantee. The project will also lead to HQP training in availability analysis and optimization techniques, which will greatly contribute to the Canadian communication industry.