研究者詳細 - 山中　直明

論文 - 山中　直明

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Dynamic multilayer routing schemes in GMPLS-based IP+optical networks

Oki Eiji, Shiomoto Kohei, Shimazaki Daisaku, Yamanaka Naoaki, Imajuku Wataru, Takigawa Yoshihiro

IEEE Communications Magazine 43 （ 1 ） 108 - 114 2005年01月

ISSN 0163-6804

This article presents two dynamic multilayer routing policies implemented in the photonic MPLS router developed by NTT for IP+optical generalized MPLS networks. According to IP traffic requests, wavelength paths called lambda label switched paths are set up and released in a distributed manner based on GMPLS routing and signaling protocols. Both dynamic routing policies first try to allocate a newly requested electrical path to an existing optical path that directly connects the source and destination nodes. If such a path is not available, the two policies employ different procedures. Policy 1 tries to find available existing optical paths with two or more hops that connect the source and destination nodes. Policy 2 tries to establish a new one-hop optical path between source and destination nodes. The performances of the two routing policies are evaluated. Simulation results suggest that policy 2 outperforms policy 1 if p is large, where p is the number of packet-switching-capable ports; the reverse is true only if p is small. We observe that p is the key factor in choosing the most appropriate routing policy. We also describe items that need to be standardized in the IETF to effectively achieve multilayer traffic engineering. © 2005 IEEE.

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Scalable multi-layer GMPLS networks based on hierarchical cloud-routers

Shimazaki Daisaku, Oki Eiji, Shiomoto Kohei, Yamanaka Naoaki

IEICE Transactions on Communications E88-B （ 3 ） 1119 - 1127 2005年

ISSN 0916-8516

This paper proposes the hierarchical cloud-router network (HCRN) to overcome the scalability limit in a multi-layer generalized multi-protocol label switching (GMPLS) network. We define a group of nodes as a virtual node, called the cloud-router (CR). A CR consists of several nodes or lower-level CRs. A CR is modeled as a multiple switching capability (SC) node when it includes more than one kind of SC, which is fiber SC, lambda SC, time-division multiplexing (TDM) SC, packet SC, even if there are no actual multiple switching capability nodes in the CR. The CR advertises its abstracted CR internal structure, which is abstracted link state information inside the CR. A large-scale, multi-layer network can then achieve scalability by advertising the CR internal structure throughout the whole network. In this scheme, the ends of a link connecting two CRs are defined as interfaces of the CRs. We adopt the CR internal cost scheme between CR interfaces to abstract the network. This CR internal cost is advertised outside the CR via the interfaces. Our performance evaluation has shown that HCRN can handle a larger number of nodes than a normal GMPLS network. It can also bear more frequent network topology changes than a normal GMPLS network. Copyright © 2005 The Institute of Electronics, Information and Communication Engineers.

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A scheduling algorithm for reducing unused timeslots by considering head gap and tail gap in Time Sliced Optical Burst Switched networks

Ito Takanori, Ishii Daisuke, Okazaki Kohei, Yamanaka Naoaki, Sasase Iwao

IFIP Advances in Information and Communication Technology （IFIP） 164 79 - 86 2005年

研究論文（学術雑誌）, 共著

We propose a scheduling algorithm for reducing unused timeslots by considering head gap and tail gap newly generated by assigning a data burst in order to improve the burst loss probability and the throughput performances in Time Sliced Optical Burst Switched (TSOBS) networks. The proposed scheduling algorithm selects the timeslot in which either head gap or tail gap newly generated becomes the minimum. We show that the proposed scheduling algorithm can improve the burst loss probability and the throughput performances as compared with the conventional one. © 2005 by International Federation for Information Processing.

A 10Gb/s wire-speed firewall system using reconfigurable processors

Katayama M., Kai H., Yoshida J., Yamada H., Shiomoto K., Yamanaka N.

IEEE International Conference on Communication ICC2005 300 - 305 2005年

研究論文（国際会議プロシーディングス）

Although the Internet is playing an increasingly significant role in global communication, it remains vulnerable to malicious traffic such as worms and DoS/DDoS attacks. In the last few years, the emergence of high speed active worms, such as Code Red II, Nimda, SQL Slammer and MS Blaster, has become a serious issue. These worms cause serious damage to communication networks throughout the world by using up network bandwidth. In addition, since conventional firewall systems are located just in front of the server and do not prevent malicious traffic from entering the network, they cannot prevent such network congestion. We have developed a proto-type system of a network firewall using reconfigurable processors. In this paper, we overview the developed system and present its evaluation results. © 2005 IEEE.

Photonic-GMPLS Leading Edge Code Research Consortium: Photonic Internet Lab.(PIL)

三澤明, 山中直明，

China Communications vol.1 （ No.1 ） 106-112 2004年12月

研究論文（研究会，シンポジウム資料等）, 共著, 査読有り

ConSet: Hierarchical Concurrent Path Setup Scheme in Multi-Layer GMPLS Networks

大木英司,　島崎大輔, 塩本公平, 山中直明，

IEICE TRANSACTION on Communication vol.E87-B （ No.10 ） 3107-3110 2004年10月

研究論文（研究会，シンポジウム資料等）, 共著, 査読有り

Bidirectional Path Setup Scheme Using on Upstream Label Set in Optical GMPLS Networks

大木英司,塩本公平,片山勝，今宿亙，山中直明，滝川好比郎

IEICE Transactions vol.E87-B （ No,6 ） 1569-1576 2004年06月

研究論文（研究会，シンポジウム資料等）, 共著, 査読有り

Performance Evaluation of Dynamic Multi-layer Routing Schemes in Optical IP Networks

大木英司,塩本公平,片山勝,今宿亙,山中直明,滝川好比郎

IEICE Transactions vol.E87-B （ No,6 ） 1577-1583 2004年06月

研究論文（研究会，シンポジウム資料等）, 共著

Photonic Internet Lab.: Breakthrough for Leading Edge Photonic-GMPLS

山中直明

IEICE Transactions vol.E87-B （ No,3 ） 573-578 2004年03月

研究論文（研究会，シンポジウム資料等）, 単著, 査読有り

Photonic Internet Lab. (PIL) is shooting for the leading edge photonic-GMPLS (Generalized Multi-protocol Label Switching) that utilizes wide-band, cost-effective photonic technology to implement IP-centric managed networks. PIL is a consortium for researching the GMPLS protocol and advancing a de facto standard in this area. Members make leading edge GMPLS code modules and test them at the lab site. The experimental results, new ideas, and protocols are contributed to standardization bodies such as IETF and OIF. This paper also describes the world's first trial of GMPLS multi-region (multi-layer), multi-route, multi-vender signaling.

Proomotion of Next-generation Photonic Network Protocol Standardization by Photonic Internet Lab (PIL)

三澤明,塩本公平,岡本聡,山中直明

NTT Technical Review vol,2 （ No.2 ） 2004年02月

研究論文（大学，研究機関等紀要）, 共著

GMPLS and IP+MPLS interworking technologies - Routing and signaling

Shimazaki Daisaku, Oki Eiji, Shiomoto Kohei, Yamanaka Naoaki

2004 Workshop on High-performance Switching and Routing, 2004 HPSR 27 - 31 2004年

研究論文（国際会議プロシーディングス）

When nodes that support generalized multi-protocol label switching (GMPLS) are introduced into existing networks, the GMPLS nodes co-exist with conventional Internet protocol (IP) and multi-protocol label switching (MPLS) (IP+MPLS) nodes that do not support GMPLS. In this case, the GMPLS nodes must Interwork with IP+MPLS nodes. This paper proposes an architecture for GMPLS and IP+MPLS inter-working based on extended routing and signaling. In the extended routing, information about some nodes and links in a GMPLS network emulates information that can be understood by IP+MPLS nodes. The emulated information is advertised to the IP+MPLS network. In the extended signaling, MPLS signaling packets are forwarded to the GMPLS data plane. An MPLS label switched path (LSP) is established through a GMPLS LSP tunnel. As a result, the IP+MPLS network can interwork with the GMPLS network without upgrading the IP+MPLS nodes. We developed GMPLS prototype nodes that support this interworking architecture and show interworking experimental results.

Photonic Internet Labにおける次世代フォトニックネットワークプロトコル標準化の推進

三澤明,塩本公平,岡本聡,山中直明

NTT技術ジャーナル vol.15 （ No.12 ） 66-67 2003年12月

研究論文（大学，研究機関等紀要）, 共著

Traffic Engineering Techniques in Photonic Networks

岡本聡、山中直明

NTT Technical Review vol.1 （ No.8 ） 24-35 2003年11月

研究論文（大学，研究機関等紀要）, 共著

Distributed Virtual Network Topology Control Mechanism in GMPLS-Based Multiregion Networks

塩本公平,大木英司,今宿亙,岡本聡，山中直明

IEEE Journal on selected areas in communications Vol.21 （ No,8 ） 1254-1262 2003年10月

研究論文（研究会，シンポジウム資料等）, 共著, 査読有り

Multi-Stage Switching System Using Optical WDM Grouped Links Based on Dynamic Bandwidth Sharing

大木英司，山中直明，中井康平，松浦伸昭

IEEE Communications Magazine Vol.41 （ No.10 ） 56-63 2003年10月

研究論文（研究会，シンポジウム資料等）, 共著, 査読有り

A Disjoint Path Selection Scheme with Shared Risk Link Group Constraints in GMPLS Networks

大木英司,松浦伸昭, 塩本公平,山中直明

IEICE TRANS. COMMUN. Vol.E86-B （ No.8 ） 2455-2462 2003年08月

研究論文（研究会，シンポジウム資料等）, 共著

Traffic engineering Techniques in the Photonic Networks

岡本聡，山中直明

NTT R&D Vol.52 182-191 2003年03月

研究論文（大学，研究機関等紀要）, 共著

WDM Optical Interconnection Modules for Tb/s-Class Electro-Optical Switching System

松浦伸昭，大山貴晴，大木英司，山中直明，山越公洋，赤堀裕二

Japan Institute of Electronics Packaging Vol.6 （ No.2 ） 168-172 2003年02月

研究論文（研究会，シンポジウム資料等）, 共著, 査読有り

Photonic MPLS network architecture based on Hikari-router

Yamanaka N.

Fourth International Workshop on Design of reliable Communication Networks, 2003(DRCN2003) 152 - 161 2003年

研究論文（国際会議プロシーディングス）, 単著

This paper describes multilayer traffic engineering and signaling technologies in the photonic-GMPLS-router (Hikari-router) network. Multilayer traffic engineering, which yields the dynamic cooperation of IP and photonic layers, is described with the goal of providing IP services cost-effectively. The establishment of photonic cut-through paths is triggered when the Layer 3 traffic loads become excessive which better uses the optical layer (LI) resources. Data on traffic volumes are exchanged among edge photonic router using an extended IBGP. To realize multilayer traffic engineering, we propose an OSPF extension that advertises both the number of total wavelengths and the number of unreserved wavelengths, and an RSVP-TE extension that minimizes the number of wavelength conversions needed. In addition, this paper presents a heuristic-based multilayer topology design scheme in which IP traffic measurements are performed in generalized multiprotocol label switches (GMPLSs). Our design scheme yields the optical label switch path (OLSP) network topology, i.e. OLSP placement that minimizes network cost in the face of fluctuations in IP traffic demand. In other words, the OLSP network topology is dynamically reconfigured to match IP traffic demand. Networks are reconfigured by the proposed scheme so as to utilize the network resources cost-effectively.

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Scalable Multi-Layer GMPLS Networks Based on Hierarchical Cloud-Routers

Shimazaki Daisaku, Oki Eiji, Shiomoto Kohei, Yamanaka Naoaki

IEEE Global Telecommunication Conference GLOBECOM'03 3792 - 3796 2003年

研究論文（国際会議プロシーディングス）, 共著

This paper proposes the hierarchical cloud-router network (HCRN) to solve the problem of overcoming the scal-ability limit in a multi-layer generalized multi-protocol label switching (GMPLS) network. We define a group of nodes as a virtual node, called cloud-router (CR). A CR consists of some number of nodes or lower-level CRs. A CR is modeled as a multiple switching capability (SC) node when it includes more than one kind of SC, which is fiber SC, lambda SC, time-division multiplexing (TDM) SC, packet SC, even if there are no actual multiple-SC nodes in the CR. The CR advertises its abstracted CR internal structure which is abstracted link state information inside the CR. A large-scale, multi-layer network can then achieve scalability by advertising the CR internal structure throughout the whole network. In this scheme, the ends of a link connecting between two CRs are defined as interfaces of the CRs. We adopt the CR internal cost scheme between CR's interfaces to abstract the network. This CR internal cost is advertised outside the CRs via the interfaces. Our performance evaluation has shown that HCRN can operate a larger number of nodes than a normal GMPLS network. It can also bear more frequent network topology changes than a normal GMPLS network.

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