实验拓扑

需求

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，R1为中心站点
3 所有私有网段可以互相通讯，私有网段使用OSPF完成。

IP规划

配置IP

R1

#
interface GigabitEthernet0/0/0ip address 16.1.1.1 255.255.255.0 
#
interface GigabitEthernet0/0/1ip address 61.1.1.1 255.255.255.0 
#
interface LoopBack0ip address 192.168.1.1 255.255.255.0 
#

R2

#
interface GigabitEthernet0/0/0ip address 26.1.1.1 255.255.255.0 
#
interface LoopBack0ip address 192.168.2.1 255.255.255.0 
#

R3

#
interface GigabitEthernet0/0/0ip address 36.1.1.1 255.255.255.0 
#
interface LoopBack0ip address 192.168.3.1 255.255.255.0 
#

R4

#
interface GigabitEthernet0/0/0ip address 46.1.1.1 255.255.255.0 
#
interface LoopBack0ip address 192.168.4.1 255.255.255.0 
#

R5

#
interface GigabitEthernet0/0/0ip address 56.1.1.1 255.255.255.0 
#
interface LoopBack0ip address 192.168.5.1 255.255.255.0 
#

R6

#
interface GigabitEthernet0/0/0ip address 16.1.1.2 255.255.255.0 
#
interface GigabitEthernet0/0/1ip address 61.1.1.2 255.255.255.0 
#
interface GigabitEthernet0/0/2ip address 56.1.1.2 255.255.255.0 
#
interface GigabitEthernet2/0/0ip address 26.1.1.2 255.255.255.0 
#
interface GigabitEthernet3/0/0ip address 36.1.1.2 255.255.255.0 
#
interface GigabitEthernet4/0/0ip address 46.1.1.2 255.255.255.0 
#

配置缺省路由

R1

#
ip route-static 0.0.0.0 0.0.0.0 16.1.1.2
ip route-static 0.0.0.0 0.0.0.0 61.1.1.2
#

R2

#
ip route-static 0.0.0.0 0.0.0.0 26.1.1.2
#

R3

#
ip route-static 0.0.0.0 0.0.0.0 36.1.1.2
#

R4

#
ip route-static 0.0.0.0 0.0.0.0 46.1.1.2
#

R5

#
ip route-static 0.0.0.0 0.0.0.0 56.1.1.2
#

配置完成后测试各直连路由连通性

R1-R2R3的GRE环境配置

R1

#
interface Tunnel0/0/0ip address 10.1.1.1 255.255.255.0 tunnel-protocol gre p2mpsource 16.1.1.1nhrp entry multicast dynamicnhrp network-id 100
#

R2

#
interface Tunnel0/0/0ip address 10.1.1.2 255.255.255.0 tunnel-protocol gre p2mpsource GigabitEthernet0/0/0ospf dr-priority 0nhrp network-id 100nhrp entry 10.1.1.1 16.1.1.1 register
#

R3

#
interface Tunnel0/0/0ip address 10.1.1.3 255.255.255.0 tunnel-protocol gre p2mpsource GigabitEthernet0/0/0ospf dr-priority 0nhrp network-id 100nhrp entry 10.1.1.1 16.1.1.1 register
#

配置完成后测试tunnel隧道的连通性

R1-R4R5的MGRE环境配置

R1

#
interface Tunnel0/0/1ip address 10.1.2.1 255.255.255.0 tunnel-protocol gre p2mpsource 61.1.1.1nhrp entry multicast dynamic
#

R4

#
interface Tunnel0/0/0ip address 10.1.2.2 255.255.255.0 tunnel-protocol gre p2mpsource 46.1.1.1nhrp entry 10.1.2.1 61.1.1.1 registernhrp entry 10.1.2.3 56.1.1.1 register
#

R5

#
interface Tunnel0/0/0ip address 10.1.2.3 255.255.255.0 tunnel-protocol gre p2mpsource 56.1.1.1nhrp entry multicast dynamicnhrp entry 10.1.2.1 61.1.1.1 register
#

配置完成后测试tunnel隧道的连通性

配置OSPF

R1的配置

#
ospf 1 router-id 1.1.1.1 area 0.0.0.0 network 10.1.1.1 0.0.0.0 network 10.1.2.1 0.0.0.0 network 192.168.1.1 0.0.0.0 
##
interface Tunnel0/0/0ospf network-type broadcast#

GRE环境下的OSPF

R2

#
ospf 1 router-id 2.2.2.2 area 0.0.0.0 network 10.1.1.2 0.0.0.0 network 192.168.2.1 0.0.0.0 
##
interface Tunnel0/0/0ospf network-type broadcastospf dr-priority 0#

R3

#
ospf 1 router-id 3.3.3.3 area 0.0.0.0 network 10.1.1.3 0.0.0.0 network 192.168.3.1 0.0.0.0 
##
interface Tunnel0/0/0ospf network-type broadcastospf dr-priority 0#

MGRE环境下的OSPF

R4

#
ospf 1 router-id 4.4.4.4 area 0.0.0.0 network 10.1.2.2 0.0.0.0 network 192.168.4.1 0.0.0.0 
#
#
interface Tunnel0/0/0ospf network-type broadcast#

R5

#
ospf 1 router-id 5.5.5.5 area 0.0.0.0 network 10.1.2.3 0.0.0.0 network 192.168.5.1 0.0.0.0 
#
#
interface Tunnel0/0/0ospf network-type broadcast#