Abstract—New services and no cooperation among Internet service providers are challenges facing by Internet nowadays. This situation is known as network ossification which makes the deployment and testing of new network technologies very difficult. Virtual network has been found as a solution for this problem which may used to make certain isolated virtual networks, sharing the physical resources of the substrate network. Meanwhile, there are some other problems through making a virtual network. Consequently, there are several solutions which have been done as well. This paper focuses on three existing solutions that have been implemented and aims to address the features of those solutions