Abstract: With the advent of the era of 5G and the IoT and the gradual increase of cloud computing applications, edge computing and cloud computing with their respective advantages are bound to integrate with each other to achieve the cloud-edge coordination, and realize the complementary advantages and collaborative linkage between cloud computing and edge computing. Due to its flexible, open and programmable network architecture, Software Defined Network (SDN) is considered to be an effective method to solve the current cloud computing and edge computing collaboration problems. Based on the advantages and disadvantages of cloud computing and edge computing, the necessity and specific connotation of cloud-edge collaboration are discussed, and the current impact of SDN on cloud computing and edge computing are summarized. Aiming at the problem of cloud-edge collaboration, a cloud-edge colla-boration network framework based on SDN is proposed to achieve the multi-dimensional collaboration between cloud computing and edge computing, such as network, storage, and computing. At the same time, the paper also points out the challenges it faces.

Key words: cloud-edge collaboration, edge-cloud collaboration, software defined network, cloud computing, edge computing, network architecture