多点双向重发布和路由策略

实验要求：

1、使用双点双向重发布
2、所有路由器进行最佳选路
3、存在路由备份，不得出现环路和路由回馈
4、R1除本身环回外，外加几条环回
172.16.1.0/24 deny
172.16.2.0/24 type 1
172.16.3.0/24 cost 6
172.16.4.0/24 type 1 cost 9
更改如上参数

实验步骤：

1.IP地址的规划和拓扑结构的搭建

2.IP地址的配置

R1：

[r1]interface g0/0/0
[r1-GigabitEthernet0/0/0]ip address 1.1.1.1 24 
[r1-GigabitEthernet0/0/0]interface g0/0/1     
[r1-GigabitEthernet0/0/1]ip address 3.3.3.1 24
[r1-GigabitEthernet0/0/1]q
[r1]interface LoopBack 0
[r1-LoopBack0]ip address 192.168.1.1 24
[r1-LoopBack0]interface LoopBack 1
[r1-LoopBack1]ip address 172.16.1.1 24
[r1-LoopBack1]interface LoopBack 2    
[r1-LoopBack2]ip address 172.16.2.1 24
[r1-LoopBack2]interface LoopBack 3    
[r1-LoopBack3]ip address 172.16.3.1 24
[r1-LoopBack3]interface LoopBack 4    
[r1-LoopBack4]ip address 172.16.4.1 24

R2：

[r2]interface g0/0/0 
[r2-GigabitEthernet0/0/0]ip address 2.2.2.2 24
[r2-GigabitEthernet0/0/0]interface g0/0/1     
[r2-GigabitEthernet0/0/1]ip address 1.1.1.2 24
[r2-GigabitEthernet0/0/1]q
[r2]interface LoopBack 0
[r2-LoopBack0]ip address 192.16.2.1 24

R3：

[r3]interface g0/0/1
[r3-GigabitEthernet0/0/1]ip address 2.2.2.1 24
[r3-GigabitEthernet0/0/1]interface g0/0/0     
[r3-GigabitEthernet0/0/0]ip address 4.4.4.1 24
[r3-GigabitEthernet0/0/0]q
[r3]interface LoopBack 0
[r3-LoopBack0]ip address 192.168.3.1 24

R4：

[r4]interface g0/0/0
[r4-GigabitEthernet0/0/0]ip address 3.3.3.2 24
[r4-GigabitEthernet0/0/0]interface g0/0/1     
[r4-GigabitEthernet0/0/1]ip address 4.4.4.2 24
[r4-GigabitEthernet0/0/1]q
[r4]interface LoopBack 0
[r4-LoopBack0]ip address 192.168.4.1 24

3.RIP和OSPF的配置

R1：

[r1]rip 1
[r1-rip-1]version 2
[r1-rip-1]network 1.0.0.0
[r1-rip-1]network 3.0.0.0
[r1-rip-1]network 192.168.1.0
[r1-rip-1]network 172.16.0.0

R2：

[r2]rip 1
[r2-rip-1]version 2
[r2-rip-1]network 1.0.0.0
[r2-rip-1]network 192.168.2.0
[r2-rip-1]q
[r2]ospf 1 router-id 2.2.2.2 
[r2-ospf-1]area 0
[r2-ospf-1-area-0.0.0.0]network 2.2.2.0 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 2.2.2.0 0.0.0.255
[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 4.4.4.0 0.0.0.255

R4：

[r4]rip 1 
[r4-rip-1]version 2
[r4-rip-1]network 3.0.0.0
[r4-rip-1]q
[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 4.4.4.0 0.0.0.255

4.多点双向重发布

R2：

[r2]rip 1
[r2-rip-1]import-route ospf 1
[r2-rip-1]q
[r2]ospf 1
[r2-ospf-1]import-route rip 1
[r2-ospf-1]

R4：

[r4]rip 1
[r4-rip-1]import-route ospf 1
[r4-rip-1]q
[r4]ospf 1
[r4-ospf-1]import-route rip 1
[r4-ospf-1]q

ospf协议传递本地环回接口网段时，为32位主机路由；但若将本地环回通过重发布导入其他路由时，基于本地路由表中的直连路由进行；若本地直连路由为其他长度掩码，将使得该网络出现两条掩码不同的路由来在整个网路传递；

解决：1）环回接口配置32位掩码ip地址   2）修改环回接口的网络类型

修改环回接口的网络类型

[r2]interface LoopBack 0
[r2-LoopBack0]ospf network-type broadcast 
[r2-LoopBack0]q

[r4]interface LoopBack 0
[r4-LoopBack0]ospf network-type broadcast 
[r4-LoopBack0]q

 修改后：

5.路由策略的配置

 R2：

R4：

查看路由表cost值均已更改