ip sla 1 启用SLA

 icmp-echo 10.87.32.10 source-ip 10.87.32.11 配置本地源IP和目标IP

 frequency 5 配置监测频率

ip sla schedule 1 life forever start-time now 配置生效时间

track 10 ip sla 1 reachabilit 配置监测机制

ip route 10.86.32.14 255.255.255.255 10.87.32.10 track 10 主路由

ip route 10.86.32.14 255.255.255.255 10.87.32.81 2  备路由

作用：在10.87.32.10出现故障中断的时候，会自动启用10.87.32.81这条路由

show ip sla

show track