自動交換光網(wǎng)絡(luò)中恢復(fù)路徑提供機制的研究
Study on Distributed Restorable Lightpath Establishment Mechanism in Automatically Switched Optical Network
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摘要: 為了獲得高效的網(wǎng)絡(luò)生存性能，基于自動交換光網(wǎng)絡(luò)(ASON)的框架，該文提出了一種新型的可恢復(fù)路徑選擇算法-聯(lián)合可變權(quán)重可恢復(fù)路徑(JVWR)選擇算法，并進行了數(shù)值仿真分析，仿真結(jié)果表明，此恢復(fù)路徑選擇算法具有明顯的業(yè)務(wù)量均衡能力，并降低了動態(tài)連接請求的阻塞概率，同時具有良好的帶寬利用率和恢復(fù)資源共享效率。該文還對mesh網(wǎng)絡(luò)業(yè)務(wù)路徑和恢復(fù)路徑的建立機制進行了討論，在ASON功能框架之內(nèi)，基于通用多協(xié)議標(biāo)記交換提出了并行mesh共享恢復(fù)路徑建立機制，從而較系統(tǒng)地對分布式恢復(fù)路徑動態(tài)建立機制進行了研究。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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