实验要求：

1 两个协议间进行多点双向重发布
2 R7的环回没有宣告在OSPF中而是后期发布进入的
3 解决环路，所有路径选择最优，且存在备份

一、IP配置

R1：

R2：

R3：

 R4：

 R5：

 R6：

  R7：

二、配置协议

 R1：

R2：

 

R3：

 

R4：

 

R5：

 

R6：

 

R7：

三、重发布

R7：

[R7-ospf-1]import-route direct 

R2：
[R2]rip 1
[R2-rip-1]import-route ospf 1
[R2-rip-1]q
[R2]ospf 1
[R2-ospf-1]import-route rip

R3：
[R3]rip 1
[R3-rip-1]im    
[R3-rip-1]import-route ospf 1
[R3-rip-1]q
[R3]ospf 1
[R3-ospf-1]import-route rip

 四、将R3环回工作方式修改未broadcast

[R3]int LoopBack 0

[R3-LoopBack0]ospf network-type broadcast

 五、修改R7在rip中学到的优先级，解决R7环回重发布产生的环路。 修改为151

R2:
[R2]ip ip-prefix a permit 7.7.7.0 24
[R2]route-policy a permit node 10
Info: New Sequence of this List.
[R2-route-policy]if-match ip-prefix a
[R2-route-policy]apply preference 151
[R2]ospf 1
[R2-ospf-1]preference route-policy a

R3:
[R3]ip ip-prefix a permit 7.7.7.0 24
[R3]route-policy a permit node 10
Info: New Sequence of this List.    
[R3-route-policy]if-match ip-prefix a
[R3-route-policy]apply preference 151
[R3-route-policy]q
[R3]rip 1
[R3-rip-1]preference route-policy a

R3路由表： 

 

R1路由表：

查看R1路由表，R3环回、24网段和34网段为负载均衡，选路不佳

六、给R1的rip增加度量 

R2：
[R2]ip ip-prefix aa permit 3.3.3.0 24
[R2]ip ip-prefix aa permit 34.1.1.0 24
[R2]int g0/0/0
[R2-GigabitEthernet0/0/0]rip metricin ip-prefix aa 2

R3：
[R3]ip ip-prefix aa permit 24.1.1.0 24
[R3]int g0/0/0
[R3-GigabitEthernet0/0/0]rip metricin ip-prefix aa 2

查看R4路由表：

 

七、将R2环回、12网段和13网段改为类型1

R2:
[R2]ip ip-prefix qq permit 12.1.1.0 24
[R2]ip ip-prefix qq permit 2.2.2.0 24
[R2]route-policy bb permit node 10
Info: New Sequence of this List.
[R2-route-policy]if-match ip-prefix qq
[R2-route-policy]apply cost-type type-1
[R2-route-policy]q
[R2]route-policy bb permit node 20
Info: New Sequence of this List.
[R2-route-policy]q
[R2]ospf 1
[R2-ospf-1]import-route rip 1 route-policy bb

R3:
[R3]ip ip-prefix aa permit 13.1.1.0 24
[R3]route-policy bb permit node 10
Info: New Sequence of this List.
[R3-route-policy]if-match ip-prefix aa
[R3-route-policy]apply cost-type type-1
[R3-route-policy]q
[R3]route-policy bb permit node 20
Info: New Sequence of this List.
[R3-route-policy]q
[R3]ospf 1
[R3-ospf-1]import-route rip 1 route-policy  bb

八、测试

检查路由表，负载均衡已消除