实验要求：
IP地址的规划及其配置
按照下图进行IP地址配置
R1
R2
R3
R4
R5
R6
实现可访问公网
首先每台路由器写一条到R4的缺省路由，以R1为例
再进行NAT地址转换
搭建MGRE环境
R1-2-3星型结构MGRE搭建(R1为中心站点)
R1
[R1]int t0/0/0
[R1-Tunnel0/0/0]ip add 10.1.1.1 24
[R1-Tunnel0/0/0]tunnel-protocol gre p2mp[R1-Tunnel0/0/0]source 41.1.1.1
[R1-Tunnel0/0/0]nhrp entry multicast dynamic
[R1-Tunnel0/0/0]nhrp network-id 100
R2
[R2]int t0/0/0
[R2-Tunnel0/0/0]ip add 10.1.1.2 24
[R2-Tunnel0/0/0]tunnel-protocol gre p2mp
[R2-Tunnel0/0/0]source g0/0/1
[R2-Tunnel0/0/0]nhrp entry 10.1.1.1 41.1.1.1 register
[R2-Tunnel0/0/0]nhrp network-id 100
R3
[R3]int t0/0/0
[R3-Tunnel0/0/0]ip add 10.1.1.3 24
[R3-Tunnel0/0/0]tunnel-protocol gre p2mp
[R3-Tunnel0/0/0]source g0/0/1
[R3-Tunnel0/0/0]nhrp entry 10.1.1.1 41.1.1.1 register
[R3-Tunnel0/0/0]nhrp network-id 100
检测
[r1]display nhrp peer all
R1-5-6全连网状MGRE搭建（R1 R5均为中心区域）
R1
[R1]int t0/0/1
[R1-Tunnel0/0/1]ip add 10.1.2.1 24
[R1-Tunnel0/0/1]tunnel-protocol gre p2mp
[R1-Tunnel0/0/1]source 14.1.1.1
[R1-Tunnel0/0/1]nhrp entry multicast dynamic
[R1-Tunnel0/0/1]nhrp network-id 110
R5
[R5]int t0/0/1
[R5-Tunnel0/0/1]ip add 10.1.2.2 24
[R5-Tunnel0/0/1]tunnel-protocol gre p2mp
[R5-Tunnel0/0/1]source g0/0/1
[R5-Tunnel0/0/1]nhrp entry multicast dynamic
[R5-Tunnel0/0/1]nhrp network-id 110
R6
[R6]int t0/0/1
[R6-Tunnel0/0/1]ip add 10.1.2.3 24
[R6-Tunnel0/0/1]tunnel-protocol gre p2mp
[R6-Tunnel0/0/1]source g0/0/1
[R6-Tunnel0/0/1]nhrp entry 10.1.2.1 14.1.1.1 register
[R6-Tunnel0/0/1]nhrp entry 10.1.2.2 45.1.1.1 register
检测
[r5]display nhrp peer all
OSPF宣告
R1
[R1]ospf 1 router-id 1.1.1.1
[R1-ospf-1]area 0
[R1-ospf-1-area-0.0.0.0]network 10.1.1.0 0.0.0.255
[R1-ospf-1-area-0.0.0.0]network 192.168.1.0 0.0.0.255
R2
[R2]ospf 1 router-id 2.2.2.2
[R2-ospf-1]area 0
[R2-ospf-1-area-0.0.0.0]network 192.168.2.0 0.0.0.255
[R2-ospf-1-area-0.0.0.0]network 10.1.1.0 0.0.0.255
R3
[R3]ospf 1 router-id 3.3.3.3
[R3-ospf-1]area 0
[R3-ospf-1-area-0.0.0.0]network 192.168.3.0 0.0.0.255
[R3-ospf-1-area-0.0.0.0]network 10.1.1.0 0.0.0.255
R5
[R5]ospf 1 router-id 5.5.5.5
[R5-ospf-1]area 0[R5-ospf-1-area-0.0.0.0]network 192.168.4.0 0.0.0.255
[R5-ospf-1-area-0.0.0.0]network 10.1.1.0 0.0.0.255
R6
[R6]ospf 1 router-id 6.6.6.6
[R6-ospf-1]area 0
[R6-ospf-1-area-0.0.0.0]network 192.168.5.0 0.0.0.255
[R6-ospf-1-area-0.0.0.0]network 10.1.2.0 0.0.0.255
MGRE环境中，OSPF接口工作方式修改
R1-2-3星型结构修改为p2mp类型
R1
[R1]int t0/0/0
[R1-Tunnel0/0/0]ospf network-type p2mp
R2
[R2]int t0/0/0
[R2-Tunnel0/0/0]ospf network-type p2mp
R3
[R3]int t0/0/0
[R3-Tunnel0/0/0]ospf network-type p2mp
R1-5-6全连网状结构修改为broadcast类型
R1
[R1]int t0/0/1
[R1-Tunnel0/0/1]ospf network-type broadcast
R5
[R5]int t0/0/1
[R5-Tunnel0/0/1]ospf network-type broadcast
R6
[R6]int t0/0/1
[R6-Tunnel0/0/1]ospf network-type broadcast
检测
<R1>display ospf peer brief
<R1>display ip routing-table protocol ospf
最后再用电脑测试
