Inter-Domain Redundancy Path Computation Methods Based on PCE
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概要
- 論文の詳細を見る
This paper evaluates three inter-domain redundancy path computation methods based on PCE (Path Computation Element). Some inter-domain paths carry traffic that must be assured of high quality and high reliability transfer such as telephony over IP and premium virtual private networks (VPNs). It is, therefore, important to set inter-domain redundancy paths, i. e. primary and secondary paths. The first scheme utilizes an existing protocol and the basic PCE implementation. It does not need any extension or modification. In the second scheme, PCEs make a virtual shortest path tree (VSPT) considering the candidates of primary paths that have corresponding secondary paths. The goal is to reduce blocking probability; corresponding secondary paths may be found more often after a primary path is decided; no protocol extension is necessary. In the third scheme, PCEs make a VSPT considering all candidates of primary and secondary paths. Blocking probability is further decreased since all possible candidates are located, and the sum of primary and secondary path cost is reduced by choosing the pair with minimum cost among all path pairs. Numerical evaluations show that the second and third schemes offer only a few percent reduction in blocking probability and path pair total cost, while the overheads imposed by protocol revision and increase of the amount of calculation and information to be exchanged are large. This suggests that the first scheme, the most basic and simple one, is the best choice.
- （社）電子情報通信学会の論文
- 2008-10-01
著者
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Shiomoto Kohei
NTT Network Service Systems Laboratories, NTT Corporation
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OKI Eiji
Dept. of Information and Communication Engineering, The University of Electro-Communications
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Shiomoto Kohei
Ntt Network Service Systems Labs
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Shiomoto K
Ntt Corp. Musashino‐shi Jpn
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Shiomoto Kohei
Ntt Network Service Systems Laboratories Ntt Corporation
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Shiomoto Kohei
Ntt Network Innovation Laboratories Ntt Corporation
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Oki Eiji
University of Electro-Communications
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HAYASHI Rie
NTT Network Service Systems Laboratories, NTT Corporation
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Hayashi Rie
Ntt Network Serv. Systems Labs. Tokyo Jpn
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Shiomoto Kohei
Network Service Systems Laboratories Ntt Corporation
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Oki E
Department Of Information And Communication Engineering The University Of Electro-communications
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Oki Eiji
Univ. Electro‐communications Chofu‐shi Jpn
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Oki Eiji
Department Of Information And Communication Engineering The University Of Electro-communications
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Hayashi Rie
Ntt Network Service Systems Labs. Ntt Corporation
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Oki Eiji
Dept. Of Communication Engineering And Informatics The University Of Electro-communications
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