Abstract: The growing size of servers necessitates greater efficiency in data center networks.To address this,researchers have introduced various new data center networks to enhance traditional configurations,which often suffer from low reliability,high deployment costs,limited bandwidth,and numerous other drawbacks.SWCube is an innovative data center network designed based on the generalized hypercube,achieved by replacing the nodes of the generalized hypercube with switches and incorporating one dual-port server into each edge connecting two switches.Its logical graph corresponds to the line graph of the generalized hypercube.SWCube has demonstrated numerous advantages,including high bisection width,ability to accommodate many servers,scalability,etc.However,its reliability remains unexamined.The reliability of a network is divided into fault tolerance and fault diagnosis capability,typically assessed by the connectivity and diagnosability obtained from system-level diagnosis under various models.To this end,a recursive definition of the SWCube logical graph is presented.According to this definition,the connectivity of the SWCube logical graph is given as $\sum_{i=1}^{r}\left(m_{i}-1\right)$ for the case where r=2 and m₂=2,and as $2 \sum_{i=1}^{r}\left(m_{i}-1\right)-2$ where r≠2 or m₂>2.Based on this,the diagnosability of SWCube under the PMC model and the MM^* model is derived.

Key words: Data center networks, SWCube, Connectivity, System level diagnosis, Diagnosability, PMC model, MM^* model