一，拓扑
二，要求
1，R6为ISP只能配置IP地址，R1-R5的环回为私有网段
2，R1/4/5为全连的MGRE结构，R1/2/3为星型的拓扑结构，
3，R1为中心站点所有私有网段可以互相通讯，私有网段使用osPF完成
三，配置
r1
IP配置：
r1\]interface GigabitEthernet 0/0/0 \[r1-GigabitEthernet0/0/0\]ip address 16.0.0.1 24 \[r1\]interface GigabitEthernet 0/0/1 \[r1-GigabitEthernet0/0/1\]ip address 17.0.0.1 24 \[r1\]interface LoopBack 0 \[r1-LoopBack0\]ip address 192.168.1.1 24 **缺省路由：** \[r1\]ip route-static 0.0.0.0 0 16.0.0.2 \[r1\]ip route-static 0.0.0.0 0 17.0.0.2 **隧道接口配置：** \[r1\]interface Tunnel 0/0/0 \[r1-Tunnel0/0/0\]ip address 10.1.1.1 24 \[r1-Tunnel0/0/0\]tunnel-protocol gre p2mp \[r1-Tunnel0/0/0\]source 16.0.0.1 \[r1-Tunnel0/0/0\]ospf network-type broadcast //修改接口类型 \[r1-Tunnel0/0/0\]nhrp entry multicast dynamic//开启伪广播来实现OSPF的组播功能 **隧道接口配置：** \[r1\]interface Tunnel 0/0/1 \[r1-Tunnel0/0/1\]shutdown //关闭接口，方便配置实现 \[r1-Tunnel0/0/1\]ip address 10.1.2.1 24 \[r1-Tunnel0/0/1\]tunnel-protocol gre p2mp \[r1-Tunnel0/0/1\]source GigabitEthernet 0/0/1 \[r1-Tunnel0/0/1\]nhrp entry 10.1.2.2 46.0.0.1 register \[r1-Tunnel0/0/1\]nhrp entry 10.1.2.3 56.0.0.1 register \[r1-Tunnel0/0/1\]ospf network-type broadcast **OSPF配置：** \[r1\]ospf 1 router-id 1.1.1.1 \[r1-ospf-1\]are \[r1-ospf-1\]area 0 \[r1-ospf-1-area-0.0.0.0\]net \[r1-ospf-1-area-0.0.0.0\]network 10.1.1.0 0.0.0.255 \[r1-ospf-1-area-0.0.0.0\]network 10.1.2.0 0.0.0.255 \[r1-ospf-1-area-0.0.0.0\]network 192.168.1.0 0.0.0.255 \[r1\]interface Tunnel 0/0/1 //开启接口 \[r1-Tunnel0/0/1\]undo shutdown r2 **IP配置：** \[r2\]interface GigabitEthernet 0/0/0 \[r2-GigabitEthernet0/0/0\]ip address 26.0.0.1 24 \[r2\]interface LoopBack 0 \[r2-LoopBack0\]ip address 192.168.2.1 24 **缺省路由：** \[r2\]ip route-static 0.0.0.0 0 26.0.0.2 **隧道接口配置：** \[r2\]interface Tunnel 0/0/0 \[r2-Tunnel0/0/0\]ip address 10.1.1.2 24 \[r2-Tunnel0/0/0\]tunnel-protocol gre p2mp \[r2-Tunnel0/0/0\]source GigabitEthernet 0/0/0 \[r2-Tunnel0/0/0\]nhrp entry 10.1.1.1 16.0.0.1 register \[r2-Tunnel0/0/0\]ospf network-type broadcast \[r2-Tunnel0/0/0\]ospf dr-priority 0 **OSPF配置：** \[r2\]ospf 1 router-id 2.2.2.2 \[r2-ospf-1\]area 0 \[r2-ospf-1-area-0.0.0.0\]network 10.1.1.0 0.0.0.255 \[r2-ospf-1-area-0.0.0.0\]network 192.168.2.0 0.0.0.255 r3 **IP配置：** \[r3\]interface GigabitEthernet 0/0/0 \[r3-GigabitEthernet0/0/0\]ip address 36.0.0.1 24 \[r3\]interface LoopBack 0 \[r3-LoopBack0\]ip address 192.168.3.1 24 **缺省路由：** \[r3\]ip route-static 0.0.0.0 0 36.0.0.2 **隧道接口配置：** \[r3\]interface Tunnel 0/0/0 \[r3-Tunnel0/0/0\]ip address 10.1.1.3 24 \[r3-Tunnel0/0/0\]tunnel-protocol gre p2mp \[r3-Tunnel0/0/0\]source GigabitEthernet 0/0/0 \[r3-Tunnel0/0/0\]nhrp entry 10.1.1.1 16.0.0.1 register \[r3-Tunnel0/0/0\]ospf network-type broadcast **OSPF配置：** \[r3\]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 r4 **IP配置：** \[r4\]interface GigabitEthernet 0/0/0 \[r4-GigabitEthernet0/0/0\]ip address 46.0.0.1 24 \[r4\]interface LoopBack 0 \[r4-LoopBack0\]ip address 192.168.4.1 24 **缺省路由：** \[r4\]ip route-static 0.0.0.0 0 46.0.0.2 **隧道接口配置：** \[r4\]interface Tunnel 0/0/0 \[r4-Tunnel0/0/0\]shutdown \[r4-Tunnel0/0/0\]ip address 10.1.2.2 24 \[r4-Tunnel0/0/0\]tunnel-protocol gre p2mp \[r4-Tunnel0/0/0\]source GigabitEthernet 0/0/0 \[r4-Tunnel0/0/0\]nhrp entry 10.1.2.1 17.0.0.1 register \[r4-Tunnel0/0/0\]nhrp entry 10.1.2.3 56.0.0.1 register \[r4-Tunnel0/0/0\]ospf network-type broadcast **OSPF配置：** \[r4\]ospf 1 router-id 4.4.4.4 \[r4-ospf-1\]area 0 \[r4-ospf-1-area-0.0.0.0\]network 192.168.4.0 0.0.0.255 \[r4-ospf-1-area-0.0.0.0\]network 10.1.2.0 0.0.0.255 开启接口 \[r4\]interface Tunnel 0/0/0 \[r4-Tunnel0/0/0\]undo shutdown r5**IP配置：** \[r5\]interface GigabitEthernet 0/0/0 \[r5-GigabitEthernet0/0/0\]ip address 56.0.0.1 24 \[r5\]interface LoopBack 0 \[r5-LoopBack0\]ip address 192.168.5.1 24 **缺省路由：** \[r5\]ip route-static 0.0.0.0 0 56.0.0.2 **隧道接口配置：** \[r5\]interface Tunnel 0/0/0 \[r5-Tunnel0/0/0\]shutdown \[r5-Tunnel0/0/0\]ip address 10.1.2.3 24 \[r5-Tunnel0/0/0\]tunnel-protocol gre p2mp \[r5-Tunnel0/0/0\]source GigabitEthernet 0/0/0 \[r5-Tunnel0/0/0\]nhrp entry 10.1.2.1 17.0.0.1 register \[r5-Tunnel0/0/0\]nhrp entry 10.1.2.2 46.0.0.1 register \[r5-Tunnel0/0/0\]ospf network-type broadcast **OSPF配置：** \[r5\]ospf 1 router-id 5.5.5.5 \[r5-ospf-1\]area 0 \[r5-ospf-1-area-0.0.0.0\]network 192.168.5.0 0.0.0.255 \[r5-ospf-1-area-0.0.0.0\]network 10.1.2.0 0.0.0.255 \[r5\]interface Tunnel 0/0/0 \[r5-Tunnel0/0/0\]undo shutdown r6 **IP配置：** \[r6\]interface GigabitEthernet 4/0/0 \[r6-GigabitEthernet4/0/0\]ip address 17.0.0.2 24 \[r6\]interface GigabitEthernet 0/0/0 \[r6-GigabitEthernet0/0/0\]ip address 16.0.0.2 24 \[r6\]interface GigabitEthernet 0/0/1 \[r6-GigabitEthernet0/0/1\]ip address 26.0.0.2 24 \[r6\]interface GigabitEthernet 0/0/2 \[r6-GigabitEthernet0/0/2\]ip address 36.0.0.2 24 \[r6\]interface GigabitEthernet 2/0/0 \[r6-GigabitEthernet2/0/0\]ip address 46.0.0.2 24 \[r6\]interface GigabitEthernet 3/0/0 \[r6-GigabitEthernet3/0/0\]ip address 56.0.0.2 24
四，测试
