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Study On Label Switching Based On GMPLS Optical Network

Posted on:2008-05-01Degree:MasterType:Thesis
Country:ChinaCandidate:B Y AiFull Text:PDF
GTID:2178360215975881Subject:Communication and Information System
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With the increase and the development of optical network at a very high speed,it needs network performance such as network bandwidth,extensibility and adaptability can adapt to new business. New experimental networks come forth continuallyAn all-optical wavelength switching optical network was built in Amsterdam and also a GMPLS network for multilayers was developed by NTT company recently. Based on these, new technology and new method are proposed incessantly, which makes GMPLS become a new highlight in the field of optical network study. More and more study and discuss are on try to search a high efficency network , combinating high_speed tranfering with flexible switching .To solve the problem of "electronic bottle-neck" existing in the optical link by the technology of WDM will inevitably lead to the combination between IP and optical network, which makeS IP packets run on the layer of optical directly.GMPLS is the extention of MPLS toward optical network , makes label supporting packet switching together with time_division swiching .GMPLS also improve and supplement sigal instruction and routing protocol.In this paper, after studying and analyzing GMPLS intellectual optical network contructure and network management, we also study label format and main protocols in GMPLS all_optical network. Particularly , we discuss the technology of label switching in GMPLS_Centric all_optical networks .Two solutions are proposed .One is width label prioritization ,which can include a label set implied a value of label priority in the path message of RSVP. We can set the available wavelength pool and used wavelength pool to control upstream node select an suitable wavelength in downstream.,. It can reduce the reduce the reversed network block rate by the technology of label prioritization . The other is optical code label switching, which can use any optical signal parameter to be a optical label .The optical label was assigned to a private packet in order to transfer from original to the destination by switching in an all_optical manner. Based on it, the technology of stack was introduced into optical code label switching expecting to solve bottle_neck of too large label information data in ESR. The main achievements are as follows.1) We have studied network structure ,the mail protocol and their relationship. Further to study network management technology and the main problem existing in wavelength label switching network. 2) The concept of Flagged Set object and Flagged Pool were introduced in order to priorization.3) We evaluate the performance of the proposed label priporitization scheme on the 16-node NSFNET network. The result showed that all of the three signaling scheme performs better than existing GMPLS in blocking probability.4) Proposed a optical code label switching ,which use existing optical processing technology to get optical label by any optical signal parameter.Optical signal identification is obtained by optical self_related. In conclusion, the technology of optical code label stack is feasible in GMPLS all_optical network to solve the critical issues which are the data granularity of a wavelength and the very exiguous label space.5) Introduce stack data into optical label network to avoid network blocking resulting from too large label information data base. We design an optical network simulation platform using NS2. The introduction of technology of optical code label stack will great improve optical network performance .
Keywords/Search Tags:Wavelength label pripriotization, Optical code label, GMPLS, Optical code label, Label stack
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