“…In order to cooperate with the automatic opening and second level deployment of cloud computing, network workers began to think about the evolution of the cloud network of the data center 10 years ago [3]. From the early second tier of FabricPath/Drill/OTV to today's VXLAN based lightweight overlay technology, it can be said that the cloud network of the data center has developed relatively fast, especially with the emergence of SDN technology, the on-demand service capability and automatic management of the internal network of the cloud center have been basically realized, However, the heterogeneous network environment, the mixed Overlay environment [4], and the multi domain network environment still have great challenges: objectively speaking, the multiple network protocols and the complex technology lead to the difficulty in the automatic deployment and management of the end-to-end network. On the one hand [5], the network will involve the cooperation of multiple domains: in addition to the data center network, the backbone network and the edge access network should also be considered.…”