R1(config)#interface tunnel 1
R1(config-if)#ip address 1.1.1.1 255.255.255.0
R1(config-if)#tunnel source 100.1.1.1
R1(config-if)#tunnel destination 200.1.1.1
R1(config)#ip route 192.168.1.0 255.255.255.0 tunnel 1 //添加静态路由
R3(config-if)#keepalive 5 3 //超时时间=5*3
R1(config)#exit
R1#ping 192.168.1.1 source 10.1.1.1
R3(config)#interface tunnel 3
R3(config-if)#ip address 1.1.1.2 255.255.255.0
R3(config-if)#tunnel source 200.1.1.1
R3(config-if)#tunnel destination 100.1.1.1
R3(config-if)#keepalive 5 3
R3(config)#ip route 10.1.1.0 255.255.255.0 tunnel 3
R3(config-if)#exit
R1#show interfaces tunnel 3
