MBL: A Multi-stage Bufferless High-radix Router

There is a pressing need for high-radix routers in modern HPC (High Performance Computing) interconnects and to build the exascale computers with massive clusters. In this paper, we propose MBL, a high-radix router with a multi-stage bufferless switch Clos network inside. Booksim interconnection network simulator is used to implement our arbitrating designs for the architecture and it runs well under different traffic patterns in a flattened butterfly network, with 136 ports for each router.