GRE vpn 的配置

HQ：

[HQ]int Tunnel 0/0/1  //创建Tunnel接口

[HQ-Tunnel0/0/1]tunn 

[HQ-Tunnel0/0/1]tunnel-protocol gre //封装协议

[HQ-Tunnel0/0/1]ip add 200.1.1.1 24  //配置接口IP地址

[HQ-Tunnel0/0/1]source 10.1.1.2  //配置源IP地址

[HQ-Tunnel0/0/1]destination 20.1.1.2  //指定目的IP地址

[HQ-Tunnel0/0/1]q

[HQ]ip route-static 192.168.20.0 24 tunnel 0/0/1

Branch：

[Branch]int Tunnel 0/0/1

[Branch-Tunnel0/0/1]tunnel-prot    

[Branch-Tunnel0/0/1]tunnel-protocol gre

[Branch-Tunnel0/0/1]ip add 200.1.1.2 24

[Branch-Tunnel0/0/1]source 20.1.1.2

[Branch-Tunnel0/0/1]destination 10.1.1.2

[Branch-Tunnel0/0/1]q

[Branch]ip route-static 192.168.10.0 24 Tunnel 0/0/1