一、浮动路由介绍

浮动路由指的是配置两条静态路由，默认选取链路质量优（带宽大的）作为主路径，当主路径出现故障时，由带宽较小的备份路径顶替主路径。

作用：保持网络的不中断

特点：浮动路由在同一时刻，数据只会由一条链路代为转发。

二、配置步骤及命令

[R1]interface g0/0/3
[R1-GigabitEthernet0/0/3]undo shutdown
[R1-GigabitEthernet0/0/3]ip address 192.168.1.1 24
[R1-GigabitEthernet0/0/3]interface e0/0/1
[R1-Ethernet0/0/1]undo shutdown
[R1-Ethernet0/0/1]ip address 10.1.1.1 24
[R1-Ethernet0/0/1]int g0/0/2
[R1-GigabitEthernet0/0/2]undo shutdown
[R1-GigabitEthernet0/0/2]ip address 10.1.2.1 24
[R1-GigabitEthernet0/0/2]q
[R1]ip route-static 0.0.0.0 0 10.1.2.2
[R1]ip route-static 0.0.0.0 0 10.1.1.2 preference 65

[R2]int e0/0/1
[R2-Ethernet0/0/1]undo shutdown
[R2-Ethernet0/0/1]ip address 10.1.1.2 24
[R2-Ethernet0/0/1]int g0/0/2
[R2-GigabitEthernet0/0/2]undo shutdown
[R2-GigabitEthernet0/0/2]ip address 10.1.2.2 24
[R2-GigabitEthernet0/0/2]int g0/0/1
[R2-GigabitEthernet0/0/1]undo shutdown
[R2-GigabitEthernet0/0/1]ip address 10.1.3.2 24
[R2-GigabitEthernet0/0/1]q
[R2]ip route-static 192.168.1.0 24 10.1.2.1
[R2]ip route-static 192.168.1.0 24 10.1.1.1 preference 65
[R2]ip route-static 192.168.2.0 24 10.1.3.3

[R3]int g0/0/1
[R3-GigabitEthernet0/0/1]undo shutdown
[R3-GigabitEthernet0/0/1]ip address 10.1.3.3 24
[R3-GigabitEthernet0/0/1]int g0/0/3
[R3-GigabitEthernet0/0/3]undo shutdown
[R3-GigabitEthernet0/0/3]ip address 192.168.2.3 24
[R3-GigabitEthernet0/0/3]q
[R3]ip route-static 0.0.0.0 0 10.1.3.2

PC1