在DWDM網路中的保證保護路徑切換時間機制之探討

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姓名

彭亦暄(I-Hsuan Peng) 查詢紙本館藏

畢業系所

電機工程學系

論文名稱

在DWDM網路中的保證保護路徑切換時間機制之探討
(Shared Protection of Lightpath with Guaranteed Switching Time over DWDM Networks)

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摘要(中)

頻寬一直是網路業者急於想解決的問題，光纖網路的高頻寬成為解決網路頻寬之重要方法。但在高頻寬的網路中，即使是在很短暫的時間內，一個鏈路發生故障可能影響大量資料之流失，所以使網路具存活能力(survivability)成為高頻寬網路中不可或缺的因素。光路徑(lightpath)之保護和復原機制(protection/ restoration)是偵測工作路徑上是否有鏈路發生障礙，當故障發生，則將工作路徑切換至備用路徑上，因此保護路徑切換時間(Protection Switching Time)之長短，影響著網路之傳輸品質，在光路徑之選擇時必須加以衡量。很多學術研究，致力於高密度分波多工網路的工作路徑和備用路徑之路徑選擇上，但很少機制是設計在保證保護路徑切換時間上。本論文提出之保證保護路徑機制，是以SLSP(Short Leap Shared Protection)為基礎，以有效的程序尋找剛好能滿足切換時間之備用路徑，除此之外，網路之花費亦加以衡量，讓其不致損耗太多網路資源。由模擬之結果，可以看出在保護路徑切換時間上，都能滿足使用者之需求，所需之花費與共享光路徑保護方式(shared-path protection)不相上下。

摘要(英)

It is important to solve the lack of bandwidth for carriers. Optical network can provide high capacity, so it is a key technology to deal with the problem. Survivability is a very important requirement for the deployment of broadband networks because out of service links can affect huge traffic even if it is a very short time. And the data paths of broadband networks, which are critical for traffic engineering, are always necessary to be well protected. The procedure of protection or restoration for a path is initiated when failure is detected within the working path. In order to minimize the influence on transmission quality caused by network failure and to provide a definite time for the recovery from the failure, the protection switching time (PST) should be carefully considered in path design. Several researches have been devoted to construct the protection and restoration schemes of data paths over dense wavelength division multiplexing (DWDM) networks, however, there was rare research on the design of data paths with guaranteed protection switching time. In this paper, the PST-guaranteed scheme, which is based on the concept of short leap shared protection (SLSP), for the arrangement of data paths in DWDM networks is proposed. The proposed scheme provides an efficient procedure to find a just-enough PST-guaranteed backup path for a working path. In addition to selecting the PST-guaranteed path, the network cost is also considered in a heuristic manner. The experimental results demonstrate that the paths arranged by the proposed scheme can fully meet the desired PST and the required cost of the selected path is competitive with which of the shared path scheme.

關鍵字(中)

★ 高密度分波多工
★ 保護路徑切換時間
★ 光路徑保護及復原

關鍵字(英)

★ Lightpath Protection and Restoration
★ DWDM
★ Protection Switching Time

論文目次

第一章緒論 1
第一節研究背景 1
第二節研究動機與目的 1
第三節論文結構 2
第二章光網路之簡介及其發展 4
第一節光網路之發展 4
第二節 IP/DWDM 8
第三節通用多重通訊協定標籤交換 12
第三章光網路之保護及復原機制 16
第一節保護及復原機制 16
第二節光鏈路及光路徑保護機制 18
第三節短跳躍共用機制 23
第四節 IP在WDM上的存活能力 25
第四章保證保護路徑切換時間機制 29
第一節參數 29
第二節保證保護路徑切換時間機制 32
第五章模擬驗證 36
第一節保護路徑切換時間 37
第二節花費 39
第三節阻塞率 42
第六章結論 44
第一節綜合結論與貢獻 44
第二節未來研究方向 45

參考文獻

[1] Walter Goralski, “Optical Networking & WDM”, McGraw-Hill, 2001.
[2] Kevin H. Liu, “IP over WDM”, John Wiley & Sons, Ltd, 2002.
[3] Bala Rajagopalan, et al., “IP over Optical Networks: A Framework”, draft-ietf-ipo-framework-04.txt, April 2003, Work in progress.
[4] Daniel J. Blumenthal, John E. Bowers, Lavanya Rau, Hsu-Feng Chou, Suresh Rangarajn, Wei Wang, and Henrik N. Poulsen, “Optical Signal Processing for Optical Packet Switching Networks”, IEEE Communications Magazine, February 2003, pages S23-S29.
[5] Eric Mannie, et al., “Generalized Multi-Protocol Label Switching Architecture”, draft-ietf-ccamp-gmpls-architecture-07.txt, May 2003, Work in progress.
[6] Yao-Yuan Chang, Shun-Kai Yang, Yi-Ting Wang, and Chum-Shiow Chen, “Introduction to GMPLS”, CCL Technical Journal, Vol. 101, September 2002, pages 190-195.
[7] S.Ramamurthy and Biswanath Mukherjee, “Survivable WDM Mesh Networks, PartⅠ- Protection”, Proc. IEEE Inforcom’99, pages 744-751.
[8] S.Ramamurthy and Biswanath Mukherjee, “Survivable WDM Mesh Networks, PartⅡ- Restoration”, Proc. IEEE Inforcom’99, pages 2023-2030.
[9] Changcheng Huang, Vishal Sharma, Ken Owens and Srinivas Makam, “Building Reliable MPLS Networks Using a Path Protection Mechanism”, IEEE Communications Magazine, March 2002, pages 156-162.
[10] Fone-Chi Wu, Chi-Chien Liu and Wen-Wang Hung, “Introduction to Protection and Restoration on WDM Network Using GMPLS”, CCL Technical Journal, Vol. 101, September 2002, pages 183-189.
[11] Jonathan P. Lang, et al., “Generalized MPLS Recovery Functional Specification”, draft-bala-gmpls-recovery-functional-01.txt, November 2002.
[12] Richard Rabbat, et al., “Fault Notification Protocol for GMPLS-Based Recovery”, draft-rabbat-fault-notification-protocol-03.txt, June 2003, Work in progress.
[13] Pin-Han Ho and Hussien. T. Mouftah, “A Framework for Service-Guaranteed Shared Protection in WDM Mesh Networks”, IEEE Communications Magazine, February 2002, pages 97-103.
[14] Pin-Han Ho and Hussien. T. Mouftah, “Survivable routing with SLSP framework in dynamic optical networks”, Global Telecommunications Conference, 2002. GLOBECOM '02. IEEE, Volume 2, pages 1591 -1597, 2002.
[15] Eytan Modiano and Aradhana Narula-Tam, “Survivable Lightpath Routing: A New Approach to the Design of WDM-Based Networks”, IEEE Journal on Selected Areas in Communications, Volume 20, May 2002, pages 800-809.
[16] Galen H. Sasaki and Ching-Fong Su, “The Interface between IP and WDM and Its Effect on the Cost of Survivability”, IEEE Communications Magazine, January 2003, pages 74-79.

指導教授

陳彥文(Yen-Wen Chen)

審核日期

2003-7-7

推文