A virtual cluster is a promising technology for reducing management costs and improving capacity utilization in datacenters and computer centers. However, recent cluster virtualization systems do not have the maximum scalability and flexibility required, due to limited hardware resources at one site. Therefore, we are now developing an advanced cluster management system for multi-site virtual c...

The In-VIGO approach to Grid-computing relies on the dynamic establishment of virtual grids on which application services are instantiated. InVIGO was conceived to enable computational science to take place In Virtual Information Grid Organizations. Having its first version deployed on July of 2003, In-VIGO middleware is currently used by scientists from various disciplines, a noteworthy exampl...

Current studies argue that through building the virtual organization breeding environment one can quickly find partners and create a virtual enterprise. The creation of the virtual organization breeding environment requires its own social capital to satisfy some social requirements, but such researches are few This paper, based on complex network theory, proposes a new method to identify the vi...

As the Internet traffic volume increases, the IP over WDM network is expected to be the dominant architecture in future Internet backbone networks. For IP routers to transfer their traffic, the virtual topology should be constructed from lightpaths supplied by WDM networks. To reflect the demand-supply relation of IP and WDM layers, we present the total combined cost as the network design goal ...

Based on the previous research, a virtual network mapping algorithm with repeatable embedding over substrate nodes is summarized, in which, the virtual nodes in the same virtual network may be assigned to the same substrate node so that some virtual links don’t need to be mapped to reduce the substrate link costs and improve the mapping effectively. Additionally, in the link mapping process, pa...

Virtual network mapping considers the problem of fitting multiple virtual networks into one physical network in a cost-optimal way. This problem arises in Future Internet research. One of the core ideas is to utilize different virtual networks to cater to different application classes, each with customized protocols that deliver the required Quality-ofService. In this work we introduce a Greedy...

Network Virtualization is a key technology for the Future Internet, allowing the deployment of multiple independent virtual networks that use resources of the same basic infrastructure. An important challenge in the dynamic provision of virtual networks resides in the optimal allocation of physical resources (nodes and links) to requirements of virtual networks. This problem is known as Virtual...

In this paper we describe a single-server-based system we developed for a large scale networking laboratory. The system, based on virtual machines, is capable of running many concurrent virtual networks, each consisting of PCs, routers and switches, that can be connected in various configurations. Lab users can initiate and switch lab experiments with a simple web-based interface and remotely a...

Network virtualization has attracted considerable attention currently, and it has been expected to be utilized as new-generation network technology. For the network virtualization, improved network robustness is indispensable for virtual networks and a physical network. Moreover, it is important to utilize network resources in the physical network and construct a lot of virtual networks. In thi...

Network virtualization is a main paradigm of Future Internet research. It allows for automatic creation of virtual networks with application specific resource management, routing, topology and naming. Since those virtual networks need to be implemented by means of the underlying physical network, the Virtual Network Mapping Problem (VNMP) arises. In this work, we introduce the Virtual Network M...