1.配置路由接口ip
[r1]int g 0/0/1
[r1-GigabitEthernet0/0/1]ip address 192.168.1.254 24
[r1-GigabitEthernet0/0/1]int g 0/0/0
[r1-GigabitEthernet0/0/0]ip add 192.168.3.1 24
[r1-GigabitEthernet0/0/2]ip add 192.168.2.1 24
[r2]int g 0/0/0
[r2-GigabitEthernet0/0/0]ip add 192.168.3.2 24
[r2-GigabitEthernet0/0/0]int g 0/0/1
[r2-GigabitEthernet0/0/1]ip add 192.168.4.254 24
[r2-GigabitEthernet0/0/2]ip add 192.168.2.2 24
2.设置浮动路由
[r1]ip route-static 192.168.4.0 24 192.168.3.2
[r1]ip route-static 192.168.4.0 24 192.168.2.2 preference 70
[r2]ip route-static 192.168.1.0 24 192.168.3.1
[r2]ip route-static 192.168.1.0 24 192.168.2.1 preference 70