GRE及MGRE应用综合实验
一、实验拓扑
二、实验需求
1、R5为ISP，只能进行IP地址配置，其所有地址均配为公有IP地址；
2、R1和R5间使用PPP的PAP认证，R5为主认证方；
R2与R5之间使用ppp的CHAP认证，R5为主认证方
R3与R5之间使用HDLc封装；
3、R1、R2、R3构建一个MGRE环境，R1为中心站点，R1、R4间为点到点的GRE；
4、整个私有网络基本RIP全网可达；
5、所有PC设置私有IP为源IP，可以访问R5环回。
三、实验思路
1.根据划分的网段，为所有PC机以及路由器接口配置IP地址；
2为R1和R5间配置PPP的PAP认证，R5为主认证方；
3.R2与R5之间配置ppp的CHAP认证，R5为主认证方；
4.配置R3与R5之间使用HDLC封装 ；
5.在R1~R5上配置默认路由使公网互通；
6.建立R1、R4间点到点的GRE；
7.将R1、R2、R3构建一个MGRE环境，R1为中心站点；
8..配置rip来传递私网路由。
四、实验步骤
1.为所有PC机以及路由器接口配置IP地址
（1）PC机
（2）路由器接口
R1:
[R1]int g0/0/0
[R1-GigabitEthernet0/0/0]ip add 192.168.1.254 24
Jul 25 2025 22:18:48-08:00 R1 %%01IFNET/4/LINK_STATE(l)[0]:The line protocol IP
on the interface GigabitEthernet0/0/0 has entered the UP state.
[R1-GigabitEthernet0/0/0]int s4/0/0
[R1-Serial4/0/0]ip add 15.1.1.1 24
R2:
[R2]int g0/0/0
[R2-GigabitEthernet0/0/0]ip add 192.168.2.254 24
Jul 25 2025 22:24:42-08:00 R2 %%01IFNET/4/LINK_STATE(l)[0]:The line protocol IP
on the interface GigabitEthernet0/0/0 has entered the UP state.
[R2-GigabitEthernet0/0/0]int s4/0/0
[R2-Serial4/0/0]ip add 25.1.1.1 24
R3:
[R3]int g0/0/0
[R3-GigabitEthernet0/0/0]ip add 192.168.3.254 24
Jul 25 2025 22:35:19-08:00 R3 %%01IFNET/4/LINK_STATE(l)[0]:The line protocol IP
on the interface GigabitEthernet0/0/0 has entered the UP state.
[R3-GigabitEthernet0/0/0]int s4/0/0
[R3-Serial4/0/0]ip add 35.1.1.1 24
R4:
[R4]int g0/0/1
[R4-GigabitEthernet0/0/1]ip add 192.168.4.254 24
[R4-GigabitEthernet0/0/1]
Jul 25 2025 22:37:13-08:00 R4 %%01IFNET/4/LINK_STATE(l)[0]:The line protocol IP
on the interface GigabitEthernet0/0/1 has entered the UP state.
[R4-GigabitEthernet0/0/1]int g0/0/0
[R4-GigabitEthernet0/0/0]ip add 45.1.1.1 24
R5:
[R5]int g0/0/0
[R5-GigabitEthernet0/0/0]ip add 45.1.1.2 24
[R5-GigabitEthernet0/0/0]
Jul 25 2025 22:41:37-08:00 R5 %%01IFNET/4/LINK_STATE(l)[0]:The line protocol IP
on the interface GigabitEthernet0/0/0 has entered the UP state.
[R5-GigabitEthernet0/0/0]int s4/0/1
[R5-Serial4/0/1]ip add 15.1.1.2 24
[R5-Serial4/0/1]
Jul 25 2025 22:42:30-08:00 R5 %%01IFNET/4/LINK_STATE(l)[1]:The line protocol PPP
IPCP on the interface Serial4/0/1 has entered the UP state.
[R5-Serial4/0/1]int s3/0/1
[R5-Serial3/0/1]ip add 25.1.1.2 24
[R5-Serial3/0/1]
Jul 25 2025 22:44:07-08:00 R5 %%01IFNET/4/LINK_STATE(l)[2]:The line protocol PPP
IPCP on the interface Serial3/0/1 has entered the UP state.
[R5-Serial3/0/1]int s4/0/0
[R5-Serial4/0/0]ip add 35.1.1.2 24
R5环回口：
[R5]int l0
[R5-LoopBack0]ip add 5.5.5.1 24
2. 、R1和R5间使用PPP的PAP认证，R5为主认证方
R5:
[R5]aaa
[R5-aaa]local-user wangdaye password cipher wdy12345
Info: Add a new user.
[R5-aaa]local-user wangdaye service-type ppp
[R5-aaa]q
[R5]int s4/0/1
[R5-Serial4/0/1]ppp authentication-mode PAP
[R5-Serial4/0/1]link-protocol ppp
R1:
[R1]int s4/0/0
[R1-Serial4/0/0]ppp pap local-user wangdaye password cipher wdy12345
3.R2与R5之间使用ppp的CHAP认证，R5为主认证方
R5配置如上一步
R2:
[R2]int s4/0/0
[R2-Serial4/0/0]ppp pap local-user wangdaye password cipher wdy12345
4.配置R3与R5之间使用HDLC封装
R3:
[R3]int s4/0/0
[R3-Serial4/0/0]link-protocol HDLC
R5:
[R5]int s4/0/0
[R5-Serial4/0/0]link-protocol HDLC
5. 在R1~R5上配置默认路由使公网互通
R1:
[R1]ip route-static 0.0.0.0 0 15.1.1.2
R2:
[R2]ip route-static 0.0.0.0 0 25.1.1.2
R3:
[R3]ip route-static 0.0.0.0 0 35.1.1.2
R5:
[R4]ip route-static 0.0.0.0 0 45.1.1.2
6. 建立R1、R4间点到点的GRE
（1）在R1上创建Tunnel口，模式为GRE，源地址和目的地址为本端公网地址和对端公网地址
[R1]int tunnel0/0/0
[R1-Tunnel0/0/0]tunnel-protocol gre
[R1-Tunnel0/0/0]ip add 10.1.1.1 24
[R1-Tunnel0/0/0]source 15.1.1.1
[R1-Tunnel0/0/0]destination 45.1.1.1
（2）在R4上创建Tunnel口，模式为GRE，源地址和目的地址为本端公网地址和对端公网地址
[R4]int tunnel0/0/0
[R4-Tunnel0/0/0]tunnel-protocol gre
[R4-Tunnel0/0/0]ip add 10.1.1.2 24
[R4-Tunnel0/0/0]source 45.1.1.1
[R4-Tunnel0/0/0]destination 15.1.1.1
7.将R1、R2、R3构建一个MGRE环境，R1为中心站点
（1）配置总部与分部之间的隧道-MGRE VPN
R1:
[R1]int tunnel0/0/1
[R1-Tunnel0/0/1]tunnel-protocol gre p2mp
[R1-Tunnel0/0/1]ip add 10.1.2.1 24
[R1-Tunnel0/0/1]source 15.1.1.1
R2:
[R2]int tunnel0/0/1
[R2-Tunnel0/0/1]tunnel-protocol gre ?
p2mp Point to multi-point GRE mode
<cr> Please press ENTER to execute command
[R2-Tunnel0/0/1]tunnel-protocol gre p2mp
[R2-Tunnel0/0/1]ip add 10.1.2.2 24
[R2-Tunnel0/0/1]source 25.1.1.1
R3:
[R3]int tunnel0/0/1
[R3-Tunnel0/0/1]tunnel-protocol gre p2mp
[R3-Tunnel0/0/1]ip add 10.1.2.3 24
[R3-Tunnel0/0/1]source 35.1.1.1
(2)NHRP的配置
中心站点配置：
R1:
[R1]int tunnel0/0/1
[R1-Tunnel0/0/1]nhrp network-id 100
分支站点配置：
R2：
[R2]int tunnel 0/0/1
[R2-Tunnel0/0/1]nhrp network-id 100
[R2-Tunnel0/0/1]nhrp entry 10.1.2.1 15.1.1.1 register
R3:
[R3]int tunnel0/0/1
[R3-Tunnel0/0/1]nhrp network-id 100
[R3-Tunnel0/0/1]nhrp entry 10.1.2.1 15.1.1.1
8.配置rip来传递私网路由
R1:
[R1]rip 1
[R1-rip-1]undo summary
[R1-rip-1]version 2
[R1-rip-1]network 192.168.1.0
[R1-rip-1]network 10.0.0.0
R2:
[R2]rip 1
[R2-rip-1]undo summary
[R2-rip-1]version 2
[R2-rip-1]network 192.168.2.0
[R2-rip-1]network 10.0.0.0
R3:
[R3]rip 1
[R3-rip-1]undo summary
[R3-rip-1]version 2
[R3-rip-1]network 192.168.4.0
[R3-rip-1]network 10.0.0.0
R4:
[R4]rip 1
[R4-rip-1]undo summary
[R4-rip-1]version 2
[R4-rip-1]network 192.168.4.0
[R4-rip-1]network 10.0.0.0
在 中心上开启伪广播：
[R1]int tunnel0/0/1
[R1-Tunnel0/0/1]nhrp entry multicast dynamic
关闭RIP的水平分割机制：
[R1-Tunnel0/0/1]undo rip split-horizon
[R2-Tunnel0/0/1]undo rip split-horizon
[R3-Tunnel0/0/1]undo rip split-horizon
五、实验结果
实验成功