图22.2路由方法与下一跳方法 a.Routing tables based on route b.Routing tables based on next hop Destination Route Routing table Destination Next hop Host B R1,R2,host B for host A Host B R1 Destination Route Routing table Destination Next hop Host B R2,host B for R1 Host B R2 Destination Route Routing table Destination Next hop Host B Host B for R2 Host B Host A Host B R1 R2 Network Network Network 22.5 22.5 图 22.2 路由方法与下一跳方法