如图片所示:要求R4的loopback接口访问R6loopback接口默认走R5,当链路断开走直连路由:
配置如下:
R4:
接口:
Serial1/0 10.1.46.4 YES manual up up
Serial1/1 10.1.45.4 YES manual up up
Loopback0 10.4.4.4 YES manual up up
路由:
ip route 10.6.6.6 255.255.255.255 10.1.45.5 track 1
ip route 10.6.6.6 255.255.255.255 10.1.46.6 10
其他:
track 1 ip sla 1 reachability
ip sla 1
icmp-echo 10.1.56.6 source-ip 10.1.45.5
threshold 2
timeout 1000
frequency 10
ip sla schedule 1 life forever start-time now
R5:
接口:
Serial1/0 10.1.56.5 YES manual up up
Serial1/1 10.1.45.5 YES manual up up
Loopback0 10.5.5.5 YES manual up up
路由:
ip route 10.4.4.4 255.255.255.255 10.1.45.4
ip route 10.6.6.6 255.255.255.255 10.1.56.6
R6:
接口:
Serial1/0 10.1.46.6 YES manual up up
Serial1/1 10.1.56.6 YES manual up up
Loopback0 10.6.6.6 YES manual up up
路由:
ip route 10.4.4.4 255.255.255.255 10.1.56.5
ip route 10.4.4.4 255.255.255.255 10.1.46.4