January 24, 2013
Nippon Telegraph and Telephone Corporation
The University of Electro-Communications
Nippon Telegraph and Telephone Corporation (NTT, CEO: Hiroo Unoura, Tokyo), Osaka University (President: Toshio Hirano, Osaka), and The University of Electro-Communications (UEC, President: Makoto Kajitani, Tokyo) have developed a biologically-inspired “Yuragi (fluctuations)” algorithm*1 for a virtual network*2 control technology (Fig. 1 ). By deploying the newly developed technology, we can provide the rapid recovery of a network service in case of unexpected disasters or congestions. This achievement was in part supported by the Strategic Information and Communications R&D Promotion Programme of the Ministry of Internal Affairs and Communications, Japan.
At the upcoming JGN-X*3 demonstration event sponsored by the National Institute of Information and Communications Technology (NICT), during February 5-7, 2013, we plan to demonstrate a congestion avoidance experiment using the developed technology. In the demonstration, video streaming traffic will be transferred from Okinawa to Sapporo on JGN-X, and we will confirm the rapid recovery from a congestion caused by additional background traffic.
The recent rapid spread of cloud computing and emerging applications such as M2M/IoT*4has led to sudden traffic demand changes. As multiple logical networks are operated on a common physical network infrastructure, it has become increasingly important to operate such networks in the stable manner in order to maintain the stability of each service from the view point of BCP (business continuity planning).
To cope with these issues, multiple virtual networks, each of which corresponds to a service network or a customer network, should be constructed on a common physical network infrastructure; at the same time, those networks should support the customization of network function and operation policies. Moreover, it is also necessary to accommodate unexpected sudden traffic demand changes imposed by cloud computing or emerging applications.
Thus, the research and development of a network virtualization technology based on the Yuragi algorithm, which is originally proposed by Osaka University, under the collaboration of NTT, Osaka University, and UEC.
NTT, Osaka University, and UEC have successfully developed the world’s first bio-inspired Yuragi algorithm to be applied for a network virtualization technology. Osaka University has been leading the research of biological fluctuations*5 as well as the Yuragi algorithm and its application to ICT systems. NTT and UEC are advantageous in network virtualization technologies and network protocols, respectively. This remarkable achievement has been attained by integrating leading-edge technologies of those three institutes.
By deploying our achievements, each virtual network is able to autonomously find adequate route or network topology in response to unexpected environmental changes such as equipment failures or congestions. We have successfully demonstrated adaptive virtual network reconfigurations for quick recovery in case of sudden traffic demand changes or a large-scale disaster.
A network virtualization technology based on the Yuragi algorithm. As each virtual network is able to autonomously compute nearly optimal route or network topology, the computation time is much faster compared to conventional optimization technologies and ensure adaptability to unexpected environmental changes (Fig. 2 ). This enables rapid network recovery that satisfies practical requirements in case of a large-scale disaster or congestion. Osaka University carried out theoretical study and developed control algorithms, while NTT improved control algorithm to be applied for an operational network and developed network control server to demonstrate the developed technology.
A resource management technology that enables the rapid recovery from ICT resource contention among multiple virtual networks. Osaka University developed a scheme for stabilizing the behavior of multiple virtual networks through the feedback of other virtual network status, while NTT developed a resource access mechanism that isolates the behavior of a specific virtual network from others. Those two technologies enable efficient network resource usage by adequately distributing traffic load.
A scheme to reduce the number of advertisements in an open shortest path first traffic-engineering (OSPF-TE) network. The LLR scheme keeps the information of top-rank links, ordered by link load, in a ranking table. Only the information that relates to the ranking table is advertised. With the LLR scheme, the number of advertisements is 78% reduced, comparing to the general OSPF-TE network.
We will be working on further study issues for practical deployment of our achievement, expecting the deployment of our technologies in Future Networks*6 or New-Generation Networks which will be made practical around 2020.
PR Section, Planning Department
General Affairs Office
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