A Study of Selection Mechanisms for Hub CPEs in SD-WAN Network Systems

SD-WAN (Software-Defined WAN) is an important edge access solution for compute-first networks.SD-WAN interconnects the Spoke CPEs at the enterprise branches with the Hub CPEs at the enterprise headquarters by establishing overlay tunnels through third-party networks. Since there are multiple pairs of Hub CPEs in the enterprise network, and the computing resources of each pair of Hub CPEs are limited, the Spoke CPEs need to select the Hub CPE that meets the demand for computing resources. In the past, network administrators often used manual selection based on network planning to select appropriate Hub CPEs for new Spoke CPEs, and this manual selection process is very complex, and the error of manual computation under the multi-dimensional arithmetic factor is relatively large, and the resource estimation of Hub CPEs is also prone to errors. To solve this problem, this paper proposes a subscription and collection mechanism for computing resources in SD-WAN networks, and presents a Hub CPE selection method based on multidimensional computing resources. Compared with the traditional manual selection process of Hub CPE selection, the method proposed in this paper has a simpler process and a more robust network, and it can also realize the dynamic elastic balanced access of Spoke CPE, which can better guarantee the network bearing quality of the enterprise services.