实验要求：
实验预览图：
实验分析：
1、对R1-R5配置IP地址，同时R1-R5每个路由器各有一个环回
2.1、对R1、R3、R4路由器开启虚拟接口1，分别配置隧道IP、接口封装协议，接口类型、定义封装源、开启伪广播功能，之后对分别对隧道接口、环回进行宣告。
2.2、对R1、R5、R6路由器开启虚拟接口2，以R1为hub路由器，R5、R6为spoke路由器，接着对R1配置隧道IP、接口封装协议、封装源以及开启伪广播功能，对R5、R6配置隧道IP，接口封装协议、封装源、分支向节点注册，最后对隧道IP以及环回进行宣告。
实验过程：
配置IP：
R1：
r1\]interface GigabitEthernet 0/0/0 \[r1-GigabitEthernet0/0/0\]ip address 11.0.0.1 24 \[r1\]interface GigabitEthernet 0/0/1 \[r1-GigabitEthernet0/0/1\]ip address 10.0.0.1 24 \[r1\]interface LoopBack 0 \[r1-LoopBack0\]ip address 1.1.1.1 24 \[r1\]ip route-static 0.0.0.0 0 10.0.0.2 \[r1\]ip route-static 0.0.0.0 0 11.0.0.2
检查配置：
r1\]display ip interface brief Interface IP Address/Mask Physical Protocol GigabitEthernet0/0/0 11.0.0.1/24 up up GigabitEthernet0/0/1 10.0.0.1/24 up up GigabitEthernet0/0/2 unassigned down down LoopBack0 1.1.1.1/24 up up(s) NULL0 unassigned up up(s)
R2：
r2\]interface GigabitEthernet 0/0/0 \[r2-GigabitEthernet0/0/0\]ip address 11.0.0.2 24 \[r2\]interface GigabitEthernet 0/0/1 \[r2-GigabitEthernet0/0/1\]ip address 10.0.0.2 24 \[r2\]interface GigabitEthernet 0/0/2 \[r2-GigabitEthernet0/0/2\]ip address 12.0.0.2 24 \[r2\]interface GigabitEthernet 2/0/0 \[r2-GigabitEthernet2/0/0\]ip address 13.0.0.2 24 \[r2\]interface GigabitEthernet 3/0/0 \[r2-GigabitEthernet3/0/0\]ip address 15.0.0.2 24 \[r2\]interface GigabitEthernet 4/0/0 \[r2-GigabitEthernet4/0/0\]ip address 14.0.0.2 24
检查配置：
r2\]display ip interface brief Interface IP Address/Mask Physical Protocol GigabitEthernet0/0/0 11.0.0.2/24 up up GigabitEthernet0/0/1 10.0.0.2/24 up up GigabitEthernet0/0/2 12.0.0.2/24 up up GigabitEthernet2/0/0 13.0.0.2/24 up up GigabitEthernet3/0/0 15.0.0.2/24 up up GigabitEthernet4/0/0 14.0.0.2/24 up up NULL0 unassigned up up(s)
R3:
r3\]interface GigabitEthernet 0/0/0 \[r3-GigabitEthernet0/0/0\]ip address 15.0.0.1 24 \[r3\]interface LoopBack 0 \[r3-LoopBack0\]ip address 5.5.5.5 24 \[r3\]ip route-static 0.0.0.0 0 15.0.0.2
检查配置：
r3\]display ip interface brief Interface IP Address/Mask Physical Protocol GigabitEthernet0/0/0 15.0.0.1/24 up up GigabitEthernet0/0/1 unassigned down down GigabitEthernet0/0/2 unassigned down down LoopBack0 5.5.5.5/24 up up(s) NULL0 unassigned up up(s)
R4：
r4\]interface GigabitEthernet 0/0/0 \[r4-GigabitEthernet0/0/0\]ip address 14.0.0.1 24 \[r4\]interface LoopBack 0 \[r4-LoopBack0\]ip address 4.4.4.4 24 \[r4\]ip route-static 0.0.0.0 0 14.0.0.2
检查配置:
r4\]display ip interface brief Interface IP Address/Mask Physical Protocol GigabitEthernet0/0/0 14.0.0.1/24 up up GigabitEthernet0/0/1 unassigned down down GigabitEthernet0/0/2 unassigned down down LoopBack0 4.4.4.4/24 up up(s) NULL0 unassigned up up(s)
R5：
r5\]interface GigabitEthernet 0/0/0 \[r5-GigabitEthernet0/0/0\]ip address 13.0.0.1 24 \[r5\]interface LoopBack 0 \[r5-LoopBack0\]ip address 3.3.3.3 24 \[r5\]ip route-static 0.0.0.0 0 13.0.0.2
检查配置：
r5\]display ip interface brief Interface IP Address/Mask Physical Protocol GigabitEthernet0/0/0 13.0.0.1/24 up up GigabitEthernet0/0/1 unassigned down down GigabitEthernet0/0/2 unassigned down down LoopBack0 3.3.3.3/24 up up(s) NULL0 unassigned up up(s)
R6：
r6\]interface GigabitEthernet 0/0/0 \[r6-GigabitEthernet0/0/0\]ip address 12.0.0.1 24 \[r6\]interface LoopBack 0 \[r6-LoopBack0\]ip address 2.2.2.2 24 \[r6\]ip route-static 0.0.0.0 0 12.0.0.2
检查配置：
r6\]display ip interface brief Interface IP Address/Mask Physical Protocol GigabitEthernet0/0/0 12.0.0.1/24 up up GigabitEthernet0/0/1 unassigned down down GigabitEthernet0/0/2 unassigned down down LoopBack0 2.2.2.2/24 up up(s) NULL0 unassigned up up(s)
R1、R3、R4为全连的MGRE结构：
MGRE：
R1：
r1\]interface Tunnel 0/0/0 \[r1-Tunnel0/0/0\]ip address 192.168.1.1 24 \[r1-Tunnel0/0/0\]tunnel-protocol gre p2mp ---修改接口封装协议为多点GRE \[r1-Tunnel0/0/0\]source 10.0.0.1 ---定义封装源 \[r1-Tunnel0/0/0\]nhrp network-id 1 \[r1-Tunnel0/0/0\]nhrp entry multicast dynamic ------开启伪广播功能 \[r1-Tunnel0/0/0\]ospf network-type broadcast ------修改接口类型为broadcast \[r1-Tunnel0/0/0\]nhrp entry 192.168.1.2 14.0.0.1 register ------向节点注册 \[r1-Tunnel0/0/0\]nhrp entry 192.168.1.3 15.0.0.1 register------向节点注册
R3：
r3\]interface Tunnel 0/0/0 \[r3-Tunnel0/0/0\]ip address 192.168.1.3 24 \[r3-Tunnel0/0/0\]tunnel-protocol gre p2mp ---修改接口封装协议为多点GRE \[r3-Tunnel0/0/0\]source 15.0.0.1 ---定义封装源 \[r3-Tunnel0/0/0\]nhrp network-id 1 \[r3-Tunnel0/0/0\]nhrp entry multicast dynamic ------开启伪广播功能 \[r3-Tunnel0/0/0\]ospf network-type broadcast ------修改接口类型为broadcast
R4：
r4\]interface Tunnel 0/0/0 \[r4-Tunnel0/0/0\]ip address 192.168.1.2 24 \[r4-Tunnel0/0/0\]tunnel-protocol gre p2mp ---修改接口封装协议为多点GRE \[r4-Tunnel0/0/0\]source 14.0.0.1 ---定义封装源 \[r4-Tunnel0/0/0\]nhrp network-id 1 \[r4-Tunnel0/0/0\]nhrp entry multicast dynamic ------开启伪广播功能 \[r4-Tunnel0/0/0\]ospf network-type broadcast ------修改接口类型为broadcast \[r4-Tunnel0/0/0\]nhrp entry 192.168.1.3 15.0.0.1 register------向节点注册
OSPF：
R1：
r1\]ospf 1 router-id 1.1.1.1 \[r1-ospf-1\]area 0 \[r1-ospf-1-area-0.0.0.0\]network 192.168.1.1 0.0.0.0 \[r1-ospf-1-area-0.0.0.0\]network 1.1.1.1 0.0.0.0
R3：
r3\]ospf 1 router-id 5.5.5.5 \[r3-ospf-1\]area 0 \[r3-ospf-1-area-0.0.0.0\]network 192.168.1.3 0.0.0.0 \[r3-ospf-1-area-0.0.0.0\]network 5.5.5.5 0.0.0.0
R4：
r4\]ospf 1 router-id 4.4.4.4 \[r4-ospf-1\]area 0 \[r4-ospf-1-area-0.0.0.0\]network 192.168.1.2 0.0.0.0 \[r4-ospf-1-area-0.0.0.0\]network 4.4.4.4 0.0.0.0
R1、R5、R6建立hub-spoke的MGRE环境：
MGRE:
R1：
r1\]interface Tunnel 0/0/1 \[r1-Tunnel0/0/1\]ip address 192.168.2.1 24 \[r1-Tunnel0/0/1\]tunnel-protocol gre p2mp ---修改接口封装协议为多点GRE \[r1-Tunnel0/0/1\]source 11.0.0.1 ---定义封装源 \[r1-Tunnel0/0/1\]nhrp network-id 2 \[r1-Tunnel0/0/1\]nhrp entry multicast dynamic ------开启伪广播功能 \[r1-Tunnel0/0/1\]ospf network-type p2mp------修改接口类型为p2mp
R5：
r5\]interface Tunnel 0/0/1 \[r5-Tunnel0/0/1\]ip address 192.168.2.3 24 \[r5-Tunnel0/0/1\]tunnel-protocol gre p2mp ---修改接口封装协议为多点GRE \[r5-Tunnel0/0/1\]source GigabitEthernet 0/0/0 ---定义封装源 \[r5-Tunnel0/0/1\]nhrp network-id 2 \[r5-Tunnel0/0/1\]nhrp entry 192.168.2.1 11.0.0.1 register ---分支向中心节点注册 \[r5-Tunnel0/0/1\]ospf network-type p2mp------修改接口类型为p2mp
R6：
r6\]interface Tunnel 0/0/1 \[r6-Tunnel0/0/1\]ip address 192.168.2.2 24 \[r6-Tunnel0/0/1\]tunnel-protocol gre p2mp ---修改接口封装协议为多点GRE \[r6-Tunnel0/0/1\]source GigabitEthernet 0/0/0 ---定义封装源 \[r6-Tunnel0/0/1\]nhrp network-id 2 \[r6-Tunnel0/0/1\]nhrp entry 192.168.2.1 11.0.0.1 register ---分支向中心节点注册 \[r6-Tunnel0/0/1\]ospf network-type p2mp------修改接口类型为p2mp
OSPF：
R1：
r1\]ospf 1 router-id 1.1.1.1 \[r1-ospf-1\]area 0 \[r1-ospf-1-area-0.0.0.0\]network 192.168.2.1 0.0.0.0
R5：
r5\]ospf 1 router-id 3.3.3.3 \[r5-ospf-1\]area 0 \[r5-ospf-1-area-0.0.0.0\]network 192.168.2.3 0.0.0.0 \[r5-ospf-1-area-0.0.0.0\]network 3.3.3.3 0.0.0.0
R6：
r6\]ospf 1 router-id 2.2.2.2 \[r6-ospf-1\]area 0 \[r6-ospf-1-area-0.0.0.0\]network 192.168.2.2 0.0.0.0 \[r6-ospf-1-area-0.0.0.0\]network 2.2.2.2 0.0.0.0
实验结果:
全网可达：
R1:
R3:
R4:
R5:
R6:
