MGRE-OSPF实验

路由

 

 
实验步骤:

第一步:IP地址规划

PC1:192.168.1.2 24     网关:192.168.1.1 24

PC2:192.168.2.2 24     网关:192.168.2.1 24

PC3:192.168.3.2 24     网关:192.168.3.1 24

PC4:192.168.4.2 24     网关:192.168.4.1 24

PC5:192.168.5.2 24     网关:192.168.5.1 24

R1-R4:R1 g0/0/1:16.1.1.1 24  R4 g2/0/0:16.1.1.2 24 

              R1 g0/0/2:   61.1.1.1 24  R4 g0/0/0:61.1.1.2 24

R2-R4:  R2:24.1.1.1 24  R4:24.1.1.2 24

R3-R4:  R3:34.1.1.1 24  R4:34.1.1.2 24

R5-R4:  R5:54.1.1.1 24  R4:54.1.1.2 24

R6-R4:  R6:64.1.1.1 24  R4:64.1.1.2 24

R4环回:4.4.4.4 24

第二步:IP地址配置

R1:

[R1]int g0/0/0
[R1-GigabitEthernet0/0/0]ip add 192.168.1.1 24
[R1]int g0/0/1
[R1-GigabitEthernet0/0/1]ip add 14.1.1.1 24
[R1]int g0/0/2
[R1-GigabitEthernet0/0/2]ip add 41.1.1.1 24

R2:

[R2]int g0/0/0
[R2-GigabitEthernet0/0/0]ip add 192.168.2.1 24
[R2]int g0/0/1
[R2-GigabitEthernet0/0/1]ip add 24.1.1.1 24

R3:

[R3]int g0/0/0
[R3-GigabitEthernet0/0/0]ip add 192.168.3.1 24
[R3]int g0/0/1
[R3-GigabitEthernet0/0/1]ip add 34.1.1.1 24

R4:

[R4]int g0/0/0
[R4-GigabitEthernet0/0/0]ip add 41.1.1.2 24
[R4]int g2/0/0
[R4-GigabitEthernet2/0/0]ip add 14.1.1.2 24
[R4]int g0/0/1
[R4-GigabitEthernet0/0/1]ip add 24.1.1.2 24
[R4]int g0/0/2
[R4-GigabitEthernet0/0/2]ip add 34.1.1.2 24
[R4]int g3/0/0
[R4-GigabitEthernet3/0/0]ip add 54.1.1.2 24
[R4]int g4/0/0
[R4-GigabitEthernet4/0/0]ip add 64.1.1.2 24
[R4]int LoopBack 0
[R4-LoopBack0]ip add 4.4.4.4 24

R5:

[R5]int g0/0/0
[R5-GigabitEthernet0/0/0]ip add 192.168.4.1 24
[R5]int g0/0/1
[R5-GigabitEthernet0/0/1]ip add 54.1.1.1 24

R6:

[R6]int g0/0/0
[R6-GigabitEthernet0/0/0]ip add 192.168.5.1 24
[R6]int g0/0/1
[R6-GigabitEthernet0/0/1]ip add 64.1.1.1 24

第三步:配置缺省路由

[R1]ip route-static 0.0.0.0 0 14.1.1.2
[R1]ip route-static 0.0.0.0 0 41.1.1.2
[R2]ip route-static 0.0.0.0 0 24.1.1.2
[R3]ip route-static 0.0.0.0 0 34.1.1.2
[R5]ip route-static 0.0.0.0 0 54.1.1.2
[R6]ip route-static 0.0.0.0 0 64.1.1.2

第四步:NAT

R1:

[R1]acl 2000
[R1-acl-basic-2000]rule 1 permit source any
[R1]int g0/0/1
[R1-GigabitEthernet0/0/1]nat outbound 2000
[R1]int g0/0/2	
[R1-GigabitEthernet0/0/2]nat outbound 2000

R2:

[R2]acl 2000	
[R2-acl-basic-2000]rule 1 permit source any 
[R2]int g0/0/1
[R2-GigabitEthernet0/0/1]nat outbound 2000

R3、R5、R6同理。

第五步:R1-2-3 构建一个星型结构的MGRE结构,其中R1为中心点

注意:需要开启伪广播

R1:

[R1]interface Tunnel 0/0/0
[R1-Tunnel0/0/0]tunnel-protocol gre p2mp 
[R1-Tunnel0/0/0]ip add 10.1.1.1 24
[R1-Tunnel0/0/0]source 41.1.1.1
[R1-Tunnel0/0/0]nhrp network-id 100
[R1-Tunnel0/0/0]nhrp entry multicast dynamic 

R2:

[R2]interface Tunnel 0/0/0
[R2-Tunnel0/0/0]tunnel-protocol gre p2mp 
[R2-Tunnel0/0/0]ip add 10.1.1.2 24
[R2-Tunnel0/0/0]source g0/0/1
[R2-Tunnel0/0/0]nhrp network-id 100
[R2-Tunnel0/0/0]nhrp entry 10.1.1.1 41.1.1.1 register 

R3:

[R3]interface Tunnel 0/0/0
[R3-Tunnel0/0/0]tunnel-protocol gre p2mp 
[R3-Tunnel0/0/0]ip add 10.1.1.3 24
[R3-Tunnel0/0/0]source g0/0/1
[R3-Tunnel0/0/0]nhrp network-id 100
[R3-Tunnel0/0/0]nhrp entry 10.1.1.1 41.1.1.1 register 

第六步:R1-5-6 构建另一个全连网状的MGRE网络,其中R1/5均中心区域

注意:需要开启伪广播

R1:

[R1]interface Tunnel 0/0/1
[R1-Tunnel0/0/1]tunnel-protocol gre p2mp 
[R1-Tunnel0/0/1]ip add 20.1.1.1 24
[R1-Tunnel0/0/1]source 14.1.1.1 
[R1-Tunnel0/0/1]nhrp network-id 101
[R1-Tunnel0/0/1]nhrp entry 20.1.1.2 54.1.1.1 register 
[R1-Tunnel0/0/1]nhrp entry multicast dynamic 

R5:

[R5]interface Tunnel 0/0/1
[R5-Tunnel0/0/1]tunnel-protocol gre p2mp 
[R5-Tunnel0/0/1]ip add 20.1.1.2 24
[R5-Tunnel0/0/1]source 54.1.1.1
[R5-Tunnel0/0/1]nhrp network-id 101
[R5-Tunnel0/0/1]nhrp entry 20.1.1.1 14.1.1.1 register 
[R5-Tunnel0/0/1]nhrp entry multicast dynamic 

R6:

[R6]interface Tunnel 0/0/1
[R6-Tunnel0/0/1]tunnel-protocol gre p2mp 
[R6-Tunnel0/0/1]ip add 20.1.1.3 24
[R6-Tunnel0/0/1]source g0/0/1
[R6-Tunnel0/0/1]nhrp network-id 101
[R6-Tunnel0/0/1]nhrp entry 20.1.1.1 14.1.1.1 register 
[R6-Tunnel0/0/1]nhrp entry 20.1.1.2 54.1.1.1 register 

第七步:OSPF路由配置

R1:

[R1]ospf 1 router-id 1.1.1.1
[R1-ospf-1]area 0
[R1-ospf-1-area-0.0.0.0]network 192.168.1.0 0.0.0.255
[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 20.1.1.0 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 20.1.1.0 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 20.1.1.0 0.0.0.255

在MGRE环境中,接口默认的ospf工作方式为点到点,这种方式无法实现该NBMA网段的邻居全连;故只能去修改接口的工作方式

修改接口的工作方式:

[R1-Tunnel0/0/0]ospf network-type broadcast 
[R1-Tunnel0/0/1]ospf network-type broadcast 

[R2-Tunnel0/0/0]ospf network-type broadcast 

[R3-Tunnel0/0/0]ospf network-type broadcast 

[R5-Tunnel0/0/1]ospf network-type broadcast 

[R6-Tunnel0/0/1]ospf network-type broadcast 

现在可以看见R1与其他路由器都是邻接关系

但是没有R2的ospf路由

 

需要修改R2和R3的优先级:

[R2]interface Tunnel 0/0/0
[R2-Tunnel0/0/0]ospf dr-priority 0

[R3]interface Tunnel 0/0/0
[R3-Tunnel0/0/0]ospf dr-priority 0

现在R1上有所有的ospf路由了

测试:

 

 

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