
AR1
sys
int g0/0/2
ip add 10.1.1.2 24
int g0/0/1
ip add 20.1.1.1 24
ip roue-static 0.0.0.0 0 20.1.1.2 //确保R1和R3互通
interface Tunnel0/0/1
ip address 100.1.1.1 24 //该地址可以自由规划
tunnel-protocol gre
source 20.1.1.1
destination 30.1.1.2
ip route-static 10.2.1.0 255.255.255.0 Tunnel0/0/1
AR2
int g0/0/1
ip add 20.1.1.2 24
int g0/0/2
ip add 30.1.1.1 24
AR3
sys
int g0/0/1
ip add 30.1.1.2 24
int g0/0/2
ip add 10.2.1.2 24
ip roue-static 0.0.0.0 0 30.1.1.1
interface Tunnel0/0/1
ip address 100.1.1.2 24
tunnel-protocol gre
source 30.1.1.2
destination 20.1.1.1
ip route-static 10.1.1.0 255.255.255.0 Tunnel0/0/1
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