The primary design goal is to limit the amount of traffic that requires routing in order to increase performance and reduce routing administration costs while maintaining wire - speed switching between end systems on the same logical subnet 其主要的设计目标是当在同一逻辑子网上保持终端系统之间的高速交换时，为了提高性能和减少路由的管理成本，限制需要路由的流量。
