1.拓扑图

2.要求

达到所有目标最优，互有备份

3.主要配置

左边区域配置rip，右边区域配置ospf，以r2为例

[r2]rip
[r2-rip-1]version 2
[r2-rip-1]network 12.0.0.0
[r2-rip-1]network 2.0.0.0

[r2]ospf 1 router-id 2.2.2.2
[r2-ospf-1]area 0
[r2-ospf-1-area-0.0.0.0]network 24.1.1.1 0.0.0.0

双向重发布r2，r3

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

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

[r3]rip
[r3-rip-1]import-route ospf 1

[r3]ospf 1
[r3-ospf-1]import-route rip

设置最优路径，路由策略，更改下方（上方）路径开销值，使到达目的地址路径最优

这里以r1访问r2的还回（2.2.2.2）以及24.1.1.0网段为例

[r1]acl 2000
[r1-acl-basic-2000]rule permit source 2.2.2.2 0.0.0.0 //抓取流量
[r1-acl-basic-2000]q

[r1]int g0/0/1
[r1-GigabitEthernet0/0/1]rip metricin 2000 ?
INTEGER<1-15> The value of metric adding to route
[r1-GigabitEthernet0/0/1]rip metricin 2000 2 //开销值+2
[r1-GigabitEthernet0/0/1]q

也可以使用重发布解决，使其在重发布的时候更改开销值

在r2上做重发布时更改开销值，让r1访问r3的还回（2.2.2.2）以及44.1.1.0网段选择其最优（下方）路径

[r2]ip ip-prefix xx permit 3.3.3.3 32
[r2]ip ip-prefix xx permit 34.1.1.0 24

[r2]route-policy yy permit node 10

[r2-route-policy]if-match ip-prefix xx

[r2-route-policy]apply cost 3

[r2-route-policy]q

[r2]route-policy yy permit node 20 //做空表

做重发布时调用

[r2]rip 1
[r2-rip-1]import-route ospf 1 route-policy yy

再去更改r4访问r3以及12.1.1.0 13.1.1.0网段的最优路径

[r2]acl 2000
[r2-acl-basic-2000]rule permit source 3.3.3.3 0.0.0.0

[r2-acl-basic-2000]q

[r2]route-policy oo permit node 10

[r2-route-policy]if-match acl 2000

[r2-route-policy]apply cost 5
[r2-route-policy]q
[r2]route-policy oo permit node 20

[r2-route-policy]q

调用

[r2]ospf 1
[r2-ospf-1]import-route rip route-policy oo

acl抓取13.1.1.0

[r2]acl 2000
[r2-acl-basic-2000]rule permit source 13.1.1.0 0.0.0.255

让r3 不重发布，从而达到r4去12.1.1.0网段选上方最优路径

[r3]ip ip-prefix xx permit 12.1.1.0 24
[r3]route-policy nn deny node 10
[r3-route-policy]if-match ip-prefix xx
[r3-route-policy]q
[r3]route-policy nn permit node 20
[r3-route-policy]q
[r3]ospf 1
[r3-ospf-1]import-route rip route-policy nn
[r3-ospf-1]q