自动交换光网络中恢复路径提供机制的研究
Study on Distributed Restorable Lightpath Establishment Mechanism in Automatically Switched Optical Network
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摘要: 为了获得高效的网络生存性能，基于自动交换光网络(ASON)的框架，该文提出了一种新型的可恢复路径选择算法-联合可变权重可恢复路径(JVWR)选择算法，并进行了数值仿真分析，仿真结果表明，此恢复路径选择算法具有明显的业务量均衡能力，并降低了动态连接请求的阻塞概率，同时具有良好的带宽利用率和恢复资源共享效率。该文还对mesh网络业务路径和恢复路径的建立机制进行了讨论，在ASON功能框架之内，基于通用多协议标记交换提出了并行mesh共享恢复路径建立机制，从而较系统地对分布式恢复路径动态建立机制进行了研究。Abstract: To obtain efficient survivability, this paper presents a novel restorable lightpath selection algorithm based on the automatically switched optical network frame. A numerical simulation is made in term of this routing selection algorithm. The result shows that the traffic has an obvious balancing trend; the block probability of connection requests has been reduced. At the same time, this algorithm has an excellent performance on bandwidth utility and sharing of the restoration resources. This paper also discusses the mesh network service lightpath and restoration lightpath setting up strategy. In the automatically switched optical network frame, a parallel restorable lightpath setup mechanism is proposed based on the Generalized Multi-Protocol Label Switching (GMPLS)principle.
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［1］Int Telecommun.Union,ITU-T Recommendation G.8080,Architecture for the Automatically Switched Optical Network (ASON)[S].Nov.2001.[2]The Internet Engineering Task Force,IETF Draft,Generalized Multi-Protocol Label Switching (GMPLS) Architecture.March 2002.[3]Doshi B T,et al..Optical network design and restoration[J].Bell Labs Technical Journal.1999,4(1):58-84[4]Sengupta S,et al..Capacity efficient distributed routing of mesh-restored lightpaths in optical networks[A].IEEE GLOBECOM 2001,San Antonio,Texas,USA,2001:2129-2133.[5]Hui Zang,et al..Dynamic lightpath establishment in wavelength-routed WDM networks[J].IEEE Communications Magazine,2001,39(9):100-108.[6]Guangzhi Li,et al..Efficient distributed path selection for shared restoration connections[A].IEEE INFOCOM 2002,New York,NY,USA,2002:140-149.[7]Kodialam M S,Lakshman T V.Dynamic routing of bandwidth guaranteed tunnels with restoration[A].IEEE INFOCOM 2000,Tel Avlv,Israel,2000:902-911.[8]The Internet Engineering Task Force,IETF Draft,Shared Backup Label Switched Path Restoration,May 2001.The Internet Engineering Task Force,IETF Draft,Generalized MPLS-Signaling Functional Description,November 2001. -
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