Before revision:  In this paper, we address some of the existing issues with the classic DC network topologies to be used in virtualized environment, and then investigate a group of DC network topologies with the capability of providing dynamic structures according to the service-level required depending on the active traffic in a virtual DC network.
After revision:  In this paper, we address some of the existing issues with the classic DC network topologies to be used in virtualized environment, and then investigate a group of DC network topologies with the capability of providing dynamic structures according to the service-level required by the active traffic in a virtual DC network.