Masanori Miyazawa

Optical Path Computation Element interworking with Network Management System for Transparent Mesh Networks

Optical PCE and its interwork with the NMS were investigated for planning and operation of optical transparent networks. We successfully verified effective and fast optical-path computation taking into account the physical impairments and wavelength continuity.

Nationwide GMPLS field trial using different types (MPLS/TDM/lambda) of switching capable equipment from multiple vendors

A GMPLS field trial using different types of switching capable equipments from multiple vendors was conducted on a nationwide scale and the setup of MPLS/TDM/lambda hierarchical LSP was successfully achieved ensuring GMPLS interoperability in a multilayer for the first time.

vNMF: Distributed fault detection using clustering approach for network function virtualization

Network function virtualization introduces additional complexity for network management through the use of virtualization environments. The amount of managed data and the operational complexity increases, which makes service assurance and failure recovery harder to realize. In response to this challenge, the paper proposes a distributed management function, called virtualized network management function (vNMF), to detect failures related to virtualized services. vNMF detects the failures by monitoring physical-layer statistics that are processed with a self-organizing map algorithm. Experimental results show that memory leaks and network congestion failures can be successfully detected and that and the accuracy of failure detection can be significantly improved compared to common k-means clustering.

Multi-layer Network Management System integrated with a Network Planning Tool for IP/Optical integrated network

A multi-layer NMS was successfully developed to manage the optical network and the MPLS network. The integrated network-planning tool could appropriately provide the optimized routes for a new LSP and all the existing LSPs.

Prototype demonstration of integrating MPLS/GMPLS network operation and management system

Integrating architecture of the management plane for IP/MPLS and GMPLS network was proposed and the developed prototype was successfully demonstrated in terms of functions such as an automatic topology discovery, a correlation between MPLS and GMPLS networks and a provisioning of a GMPLS LSP.

In-network real-time performance monitoring with distributed event processing

A key important issue for telecom management is the delay in comprehending network conditions. This delay harms precise network management activities because the amount of managed data required for performance management has been increasing due to emerging technology such as the virtualization tailoring dedicated network service for an enterprise. Hence, the increase in managed data is accelerating, and in future, we will see a fatal limitation of the current management approach. Timely monitoring of failure is increasingly valuable. To tackle this issue, a decentralized performance management system is assumed, and a real-time performance monitoring implemented inside distributed network devices is proposed. In the system the demonstration result shows that burst traffic was successfully detected at 250 millisecond intervals, and a detection resolution of its failure is significantly improved, compared with the conventional centralized management approach.

A multi-area MPLS/GMPLS interoperability trial over ROADM/OXC network

This article describes the first multi-area multiprotocol label switching and generalized MPLS interoperability trial over a reconfigurable optical add/drop multiplexer and optical cross-connect network. The interoperability trial demonstrated the routing of label switched paths over a multi-area GMPLS controlled ROADM/OXC network and the control of Ethernet over MPLS transport service on top of the GMPLS network. The trial was conducted using various network elements provided by 14 institutions and was carried out in Tokyo and Virginia. This article introduces the motivation for the trial, technical issues related to controlling multiarea MPLS/GMPLS networks, test network topology, and experimental results. The results show that the interior gateway routing protocol based multi-area routing architecture is a promising solution for the nationwide deployment of GMPLS networks within a carrier domain. In addition, this article discusses the technical issues of routing constraints in ROADM/OXC networks and the limit of multiarea routing without the Path Computation Element Protocol.

Proposal of the Architecture of a QoS Assured Network by Cooperating between IP Flow Control and MPLS DiffServ-TE

This paper proposes a network architecture to achieve a QoS assured network, which is composed of two QoS control technologies such as IP flow control and MPLS DiffServ-TE. IP flow control technology is utilized to treat IP packets as an IP flow distinguished by source and destination IP addresses, ports, protocol and priority and to apply the CAC function on the per-flow basis. MPLS DiffServ-TE is also used to accommodate multiple IP flows along the LSP via a bandwidth guarantee with certain service classes. By using the network testbed, we confirmed some of functions in our proposed architecture of the QoS assured network worked properly following the CAC capability of flow state routing and LSP-based bandwidth guarantee of MPLS DiffServ-TE. Multiple IP flows can be appropriately conveyed over the assigned LSP. Moreover, we verified the operation of the prototype NMS to monitor IP flows, LSPs and the inclusion relationship between them. And we also derived a policy to set the bandwidth for CAC at the edge router for effective utilization of bandwidth.

Multi-area MPLS/GMPLS Interoperability Trial Over 14-Vendor Packet/TDM/ROADM/OXC Network

A multi-area MPLS/GMPLS interoperability trial was successfully conducted using various types of network elements from 14 vendors for the first time. The results show that the interior gateway routing protocol based multi-area routing architecture is a promising solution to achieve nationwide deployment of GMPLS networks within a carrier domain.

Sustainable implementation-level workflow for automating NFV operation

Maintainability of operation workflow is a critical issue for a telecom operator especially in a multi-vendor system environment. We demonstrate the implementation of an automated fault recovery workflow that is sustainable, versatile and applicable for fault management of both physical/virtual network functions.