OSPF星型拓扑和MGRE全连

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 17.0.0.2
[r1]ip route-static 0.0.0.0 0 16.0.0.2
隧道接口：
[r1]interface Tunnel 0/0/0
[r1-Tunnel0/0/0]ip address 192.168.7.1 24
[r1-Tunnel0/0/0]tunnel-protocol gre p2mp 
[r1-Tunnel0/0/0]source 17.0.0.1
[r1-Tunnel0/0/0]nhrp network-id 100

开启伪广播：
[r1-Tunnel0/0/0]nhrp entry multicast dynamic 
修改隧道接口类型：
[r1-Tunnel0/0/0]ospf network-type broadcast

隧道接口：

[r1]interface Tunnel 0/0/1
[r1-Tunnel0/0/1]ip address 192.168.6.1 24
[r1-Tunnel0/0/1]tunnel-protocol gre p2mp 
[r1-Tunnel0/0/1]source 16.0.0.1

开启伪广播：
[r1-Tunnel0/0/1]nhrp entry multicast dynamic 
[r1-Tunnel0/0/1]nhrp network-id 400

修改隧道接口类型：
[r1-Tunnel0/0/1]ospf network-type broadcast 

ospf配置：

[r1]ospf 1 router-id 1.1.1.1    
[r1-ospf-1]area 0
[r1-ospf-1-area-0.0.0.0]network 192.168.1.0 0.0.0.255
[r1-ospf-1-area-0.0.0.0]network 192.168.6.0 0.0.0.255
[r1-ospf-1-area-0.0.0.0]network 192.168.7.0 0.0.0.255

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：

[R2]interface Tunnel 0/0/0
[R2-Tunnel0/0/0]ip address 192.168.6.2 24
[R2-Tunnel0/0/0]tunnel-protocol gre p2mp 
[R2-Tunnel0/0/0]source GigabitEthernet 0/0/0
[R2-Tunnel0/0/0]nhrp entry 192.168.6.1 16.0.0.1 register 
[r2-Tunnel0/0/0]nhrp network-id 400

修改隧道接口类型：

[R2-Tunnel0/0/0]ospf network-type broadcast 
放弃DR选取让R1成为DR：
[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 192.168.2.0 0.0.0.255
[R2-ospf-1-area-0.0.0.0]network 192.168.6.0 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：

[r3]interface Tunnel 0/0/0
[r3-Tunnel0/0/0]ip address 192.168.6.3 24
[r3-Tunnel0/0/0]tunnel-protocol gre p2mp     
[r3-Tunnel0/0/0]source GigabitEthernet 0/0/0
[r3-Tunnel0/0/0]nhrp entry 192.168.6.1 16.0.0.1 register 
[r3-Tunnel0/0/0]nhrp network-id 400

修改隧道接口类型：

[r3-Tunnel0/0/0]ospf network-type broadcast

放弃DR选取让R1成为DR：
[r3-Tunnel0/0/0]ospf dr-priority 0

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 192.168.6.0 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：

[r4]interface Tunnel 0/0/0    
[r4-Tunnel0/0/0]ip address 192.168.7.2 24
[r4-Tunnel0/0/0]tunnel-protocol gre p2mp 
[r4-Tunnel0/0/0]source GigabitEthernet 0/0/0
[r4-Tunnel0/0/0]nhrp entry 192.168.7.1 17.0.0.1 register 
[r4-Tunnel0/0/0]nhrp entry 192.168.7.3 56.0.0.1 register
[r4-Tunnel0/0/0]nhrp network-id 100

修改隧道接口类型：
[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 192.168.7.0 0.0.0.255
[r4-ospf-1-area-0.0.0.0]network 192.168.4.0 0.0.0.255

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：

[r5]interface Tunnel 0/0/0
[r5-Tunnel0/0/0]ip address 192.168.7.3 24    
[r5-Tunnel0/0/0]tunnel-protocol gre p2mp 
[r5-Tunnel0/0/0]source GigabitEthernet 0/0/0
[r5-Tunnel0/0/0]nhrp entry 192.168.7.1 17.0.0.1 register
[r5-Tunnel0/0/0]nhrp entry 192.168.7.2 17.0.0.2 register
[r5-Tunnel0/0/0]nhrp network-id 100

修改隧道接口类型：

[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 192.168.7.0 0.0.0.255 
[r5-ospf-1-area-0.0.0.0]network 192.168.5.0 0.0.0.255
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

r1 ping r2,r3

r1 ping r4,r5

 r1 ospf:

r1 r2 r3 DR: 

r1 r4 r5 DR BDR:

 

R4 隧道接口信息： 

 R5 隧道接口信息： 

R1 隧道接口信息：