Kaori Shimizu

Design of versatile academic infrastructure for multilayer network services

This paper describes the network design and configurations of the new Japanese academic infrastructure, called SINET3, which provides a rich variety of network services to more than 700 universities and research institutions. Since the start of full-scale operations in June 2007, the network has expanded its services to include multi-layer transfer services (IP, Ethernet, and layer-1), enriched virtual private network services (L3VPN, L2VPN, VPLS, and L1VPN), enhanced QoS services (packet-based and circuit-based), and brand-new layer-1 bandwidth-on-demand (BoD) services. This paper explains how the network provides these various network services on a single network platform by effectively configuring leading-edge networking components, such as high-performance IP routers, layer- 1 switches, and a BoD server. Evaluations of the network design and configurations confirmed that the networking functions were effectively coordinated. The procedures and techniques related to the configuration validation that covered all phases of the network design and construction are also presented.

Layer-1 Bandwidth on Demand Services in SINET3

This paper describes brand-new layer-1 bandwidth on demand (BoD) services implemented in the new Japanese academic backbone network, called SINET3. SINET3 is an advanced converged network that provides multi-layer transfer, enriched VPN, enhanced QoS, and layer-1 BoD services. The layer-1 BoD services are dynamic layer-1 resource allocation services directly triggered by users and artfully achieved on the multi-service platform by using a layer-1 BoD server. This paper first explains how the network accommodates a wide variety of network services by effectively combining leading-edge technologies. The paper next describes the overall mechanism for the dynamic layer-1 path setup on the multi-service platform and details the functions of the BoD server in many aspects. The designs focus on the tangible achievement of these services over a nationwide network composed of 75 layer-1 switches and 12 IP/MPLS routers.

Implementation and Evaluation of Layer-1 Bandwidth-on-Demand Capabilities in SINET3

This paper describes the implementation and evaluation of layer-1 bandwidth-on-demand (BoD) capabilities in the Japanese academic backbone network, called SINET3. The network has a nationwide GMPLS-based layer-1 platform and provides reservation-based and signaling-based BoD services. The overall architecture for providing BoD services including its capabilities, user interface, path calculation, and interface to drive the layer-1 platform are described. Actual examples of BoD services and evaluations of the path setup/release time in the network are also presented.

Resource Allocation and Provision for Bandwidth/Networks on Demand in SINET3

This paper describes flexible resource allocation and provision methods for bandwidth on demand and networks on demand in the new Japanese academic backbone network, called SINET3. SINET3 has provided a wide variety of network services such as IPv4/IPv6 dual stack, L3VPN, L2VPN/VPLS, and L1VPN services for the research and education community and started layer-1 bandwidth-on-demand services in February 2008. In SINET3 each service network is implemented as a logical service network on a single network platform by effectively combining latest technologies including logical router capabilities of IP/MPLS routers and flexible resource allocation capabilities of layer-1 switches. SINET3 can also easily create logically separated experimental network environments for new research projects. Evaluation results on some capabilities in experimental environments and demonstration results on bandwidth-on-demand capabilities in the real network are also shown in this paper.

Novel impairment-aware traffic engineering in all-optical networks

We propose a novel traffic engineering (TE) technique that can readily handle impairments so as to satisfy quality-of-signal (QoS) requirements in alloptical networks. The existence of impairment limits the maximum transmission distance of optical signals given the need to satisfy QoS requirements. The problem is that impairment-aware route computation must consider many parameters and so is rather complicated. We, therefore, propose the new TEconstraint of “logical distance” which covers several impairment factors converted into distance. It reflects the degree of impairment created by external conditions, and a transmission distance constraint can be checked easily by summing up each elements distance. Logical distance makes it simple and effective to judge whether a computed route satisfies the desired QoS or not. We confirm the feasibility of our proposal by developing a TE system for a real optical network.

Novel traffic engineering for reservation services network

We propose a heuristic routing and reservation algorithm for networks providing reservation services. Important requirements of a reservation service network are to increase network resource utilization, to provide routes satisfying specified levels of quality of service (QoS), and to minimize service interruption under the situation that it is difficult to tell exactly when, how many, and what kinds of requests will arrive in the future. To satisfy these requirements, our proposal includes the following key ideas. First, it calculates rerouting targets only when a newly requested path competes with paths in service or reserved for future use, and reroutes competing path routes, or the rerouting targets, if necessary. Additionally, rerouting is executed so as to satisfy userspsila QoS demands. This ensures that the userspsila QoS demands are satisfied, network resource utilization is increased, and changes to path routes that are in service are minimized. Our algorithm can be adopted for advance reservation requests as well as immediate ones. Numerical results indicate rerouting only a few paths improves the request acceptance success rate by 50% o compared to the do-nothing approach.

GMPLS based Multi Layer Service Network Architecture for advanced IP over optical network services in Japan

We propose a GMPLS based Multi Layer Service Network Architecture accommodating multiple services over optical network and Layer1-on-demand service with its implementation in Japanpsilas nationwide network SINET3.

Evaluation of traffic engineering technique for Layer-1 Bandwidth on demand service

This paper proposes a novel traffic engineering technique for layer-1 bandwidth on demand service; it offers flexible resource allocation and path provision. Evaluation results in a real network are reported.

Novel traffic engineering in all-optical networks considering impairment

In order to consider impairment simply and to satisfy quality-of-signal requirements in all-optical networks, we propose the new TE-constraint of ldquological distancerdquo which covers several impairment factors converted into distance.

A control channel management method for creating a reliable and stable control plane for GMPLS-based optical transport networks

This paper primes a control channel management method for GMPLS-based optical transport networks. The proposed mechanism bundles multiple control channels between adjacent nodes into a single ldquologicalrdquo control channel to hide control channel failure from the control plane signaling and routing protocols such as RSVP TE and OSPF-TE The proposed method is based on three ideas: multiple redundant control channels, a keep-alive mechanism, and control plane virtualization. The proposed method is implemented using the standard link management protocol (LMP). The performance of the proposed method is evaluated.