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IP over WDM光网络生存性路由机制的设计与仿真实现
Research and Simulated Implementation of Routing Mechanism for Survivability in IP over WDM Optical Networks
【作者】 李洁;
【导师】 王兴伟;
【作者基本信息】 东北大学 , 计算机应用技术, 2012, 硕士
【摘要】 近年来Internet业务的爆炸性增长给传统的传送网络带来了前所未有的挑战,推动着电信传送网络向高带宽、多业务方向发展。随着波分复用(Wavelength Division Mult iplexing,WDM)技术的日益成熟,它所能提供巨大传输带宽己成为解决网络高带宽需求的有效解决途径。为了降低网络运营成本,.提高带宽资源利用率,将IP这种行之有效的、支持分组化业务的协议与WDM光网直接结合,即IP over WDM已成为光网络发展的趋势。这种高带宽,多层次的网络一旦发生故障,将造成大量数据的流失,带来不可估量的后果。此外,网络规模的不断扩大,多个网络运营商的并存,使得实际的骨干光网络是由多个自治域互联而成。基于此背景,本文提出了IP over WDM光网络生存性路由机制。综合考虑业务请求对延迟的要求、保护等级的要求及网络在遭遇到人为攻击或自然灾害时产生的连续性故障,本文设计了IP over WDM光网络的生存性路由机制。首先,在每个域的边界点上引入边界列表,存放该域到目的域的K个下一跳域间链路,指导业务请求进行域间路由;其次,为各个域设计了多层辅助图,解决了域内P层与光层的路由计算与波长分配问题,根据业务请求的延迟要求,在多层辅助图上为其计算工作路由并分配波长实现域内路由及波长分配;然后,当域内无满足业务需求的路由时,根据域的边界点上存储的边界列表,对路由进行域内及域间回溯,直至为业务请求找到一条从源节点到目的节点的满足要求的工作路径为止:最后,针对人为攻击或自然灾害发生时,周围链路可能不是全部失效的,引入PSRLG(Probabilistic Shared Risk Link Group)模型的概念到保护路径的计算中,根据边界列表为业务请求寻找域间路由,根据保护等级在各个域的多层辅助图上为其计算保护路由并分配波长。为了验证本文设计机制的可行性和有效性,进行了仿真实现与性能分析。仿真结果表明,本文设计的机制可以有效地解决IP over WDM网路中的路由的生存性问题,具有良好的性能。
【Abstract】 In recent years, the explosive growth of Internet services has brought unprecedented challenges to the transmission network, and promoted the development of telecommunications transmission network toward high bandwidth and multi-service. With the WDM (Wavelength Division Multiplexing, WDM) technology has become more sophisticated, it has become an effective solution to solve high network bandwidth requirements with the ability to provide tremendous bandwidth. In order to reduce network operating costs and improve utilization of bandwidth resources,IP over WDM which is running IP protocol on WDM optical Networks directly has become the development trend of the optical network. Once such high-bandwidth, multi-level network failure, large amounts of data will be losed and would result in incalculable consequences. In addition, the size of the network continues to expand and the coexistence of multiple network operators making the actual backbone optical network is consisted of a number of autonomous domains. Based on this this paper presents the routing mechanism for survivability in IP over WDM optical network.In this thesis,in consideration of the delay constraint and the protection constraint of routing requests and the continuous fault which is casued by man-made attacks or natural disaster in the network, survivability routing mechanism in IP over WDM optical network is proposed. First, the boundary list which is used to guide rounting request for inter-domain routing,Next, design a multi-layer auxiliary graph in each domain to solve the problem of routing and wavelength assignment in IP layer and WDM layer, According to the latency requirements of routing request,working path is computed and wavelength is assigned on the multi-layer auxiliary graph to achieve domain routing and wavelength assignment; Then,when we cannot find a rout to meet the routing request, intra-domain and inter-domain backtracking is performed until find a path from a source node to a destination node meet the requirements of the rout; Finally, man-made attack or natural disasters may cause partial failure of the link, we use Probabilistic Shared Risk Link Group model to get the protect path. According to the protection requirements of routing request to find the inter-domain protect path based on Boundary list, and find the intra-domain protect path and assign wavelength on the multi-layer auxiliary graph.To validate the viability and effectiveness of the proposed mechanism, simulation and performance analysis are implemented. The simulation results show that the mechanism can not only effectively solve the survival problem of routing in IP over WDM network,but also has good performance.
【Key words】 IP over WDM optical networks; survivability; routing; multi-domain; multi-layered;
- 【网络出版投稿人】 东北大学 【网络出版年期】2015年 05期
- 【分类号】TN929.1
- 【下载频次】81