双点双向重发布以及路由策略实验

一、实验内容

 二、实验步骤

1、配置IP地址

R1配置

[R1]int s4/0/0

[R1-Serial4/0/0]ip add 12.1.1.1 24

[R1-Serial4/0/0]int g0/0/0

[R1-GigabitEthernet0/0/0]ip add 14.1.1.1 24

[R1-GigabitEthernet0/0/0]q

[R1]int l0

[R1-LoopBack0]ip add 1.1.1.1 24

R2配置

[R2]int s4/0/0

[R2-Serial4/0/0]ip add 12.1.1.2 24

[R2-Serial4/0/0]int s4/0/1

[R2-Serial4/0/1]ip add 23.1.1.2 24

[R2-Serial4/0/1]int l0

[R2-LoopBack0]ip add 2.2.2.2 24

R3配置

[R3]int s4/0/0

[R3-Serial4/0/0]ip add 23.1.1.3 24

[R3-Serial4/0/0]int s4/0/1

[R3-Serial4/0/1]ip add 34.1.1.3 24

[R3-Serial4/0/1]int l0

[R3-LoopBack0]ip add 3.3.3.3 24

R4配置

[R4]int s4/0/0

[R4-Serial4/0/0]ip add 34.1.1.4 24

[R4-Serial4/0/0]int g0/0/0

[R4-GigabitEthernet0/0/0]ip add 14.1.1.4 24

[R4-GigabitEthernet0/0/0]int l0

[R4-LoopBack0]ip add 4.4.4.4 24

2、配置OSPF及RIP

R1配置

#rip
[R1]rip 1
[R1-rip-1]version 2
[R1-rip-1]network 14.0.0.0
[R1-rip-1]network 1.0.0.0
[R1-rip-1]network 12.0.0.0

R2配置

#rip

[R2]rip 1

[R2-rip-1]version 2

[R2-rip-1]network 12.0.0.0

[R2-rip-1]network 2.0.0.0

#ospf

[R2]ospf 1 router-id 2.2.2.2

[R2-ospf-1]area 0

[R2-ospf-1-area-0.0.0.0]network 23.1.1.0 0.0.0.255

R3配置

#ospf

[R3]ospf 1 router-id 3.3.3.3

[R3-ospf-1]area 0

[R3-ospf-1-area-0.0.0.0]network 23.1.1.0 0.0.0.255

[R3-ospf-1-area-0.0.0.0]network 3.3.3.0 0.0.0.255

[R3-ospf-1-area-0.0.0.0]network 34.1.1.0 0.0.0.255

R4配置

#ospf、rip

[R4]ospf 1 router-id 4.4.4.4

[R4-ospf-1]area 0

[R4-ospf-1-area-0.0.0.0]network 4.4.4.0 0.0.0.255

[R4-ospf-1-area-0.0.0.0]network 34.1.1.0 0.0.0.255

[R4-ospf-1-area-0.0.0.0]rip 1

[R4-rip-1]version 2

[R4-rip-1]network 14.0.0.0

3、双点双向重发布

R2配置

#重发布

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

[R2-ospf-1]rip 1

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

R4配置

#重发布

[R4-rip-1]import-route ospf 1

[R4-rip-1]ospf 1

[R4-ospf-1]import-route rip 1

[R4]int l0

[R4-LoopBack0]ospf network-type broadcast         #更改l0接口网络类型为broadcast，可以减少R1上收到通过重发布进来的掩码为32位的4.4.4.4的环回路由

4、路由策略

此时，R1、R4上均会产生选路不佳的路由，我们就需要通过路由策略来干涉选路：

R2配置

#路由策略

[R2]ip ip-prefix 1 permit 4.4.4.0 24

[R2]ip ip-prefix 2 permit 34.1.1.0 24            #抓取流量

[R2]route-policy 1 permit node 10                

Info: New Sequence of this List.

[R2-route-policy]if-match ip-prefix 1            #匹配规则

[R2-route-policy]apply cost + 10                 #动作

[R2-route-policy]q

[R2]route-policy 1 permit node 15

Info: New Sequence of this List.

[R2-route-policy]if-match ip-prefix 2

[R2-route-policy]apply cost + 10

[R2-route-policy]q

[R2]route-policy 1 permit node 20               #建立空表，匹配所有，不建立的话默认拒绝所有

Info: New Sequence of this List.

[R2-route-policy]q

[R2]rip 1

[R2-rip-1]import-route ospf 1 route-policy 1

路由策略的匹配规则 ——自上而下，逐一匹配，一旦匹配上将按照该规则执行，而不再向下匹配。末尾隐含拒绝所有。

R4配置

#路由策略

[R4]ip ip-prefix 1 permit 23.1.1.0 24

[R4]route-policy 1 permit node 10

Info: New Sequence of this List.

[R4-route-policy]if-match ip-prefix 1

[R4-route-policy]apply cost + 10

[R4-route-policy]q

[R4]route-policy 1 permit node 20

Info: New Sequence of this List.

[R4-route-policy]q

[R4]rip 1

[R4-rip-1]import-route ospf 1 route-policy 1

[R4]ip ip-prefix 14 permit 14.1.1.0 24

[R4]route-policy 14 permit node 10

Info: New Sequence of this List.

[R4-route-policy]if-match ip-prefix 14

[R4-route-policy]apply cost-type type-1

[R4-route-policy]apply cost - 10

[R4-route-policy]q

[R4]route-policy 14 permit node 20

Info: New Sequence of this List.

[R4-route-policy]q

[R4]ospf 1

[R4-ospf-1]import-route rip 1 route-policy 14

5、测试

R1

R3