假设总部和分支机构使用的都是思科设备,其实不用太复杂的命令配置,开了CDP之后,仅需要一条命令就可以在分支路由器上自动生成静态路由,下面就来看看具体是怎么实施的吧!~

一.       实验目的

使用ODR实现按需路由。  

ODR能够使hub and spoke网络结构中的hub路由器自动地向spoke路由器(又称为stub站点)提供缺省路由,stub站点路由器不需要运行动态路由协议,也不需要 配置任何的静态路由,几乎没有系统资源的占用,就能够实现本地所有的直连子网向hub路由器的自动通告.

 

二.       实验拓扑

 

三.       配置要点

R6(config)#router odr

 (仅需在全局配置模式使用此命令即可)

四.       验证结果

用debug可以看到学习的过程:

R6#debug cdp packets

CDP packet info debugging is on

R6#

01:05:23: CDP-PA: version 2 packet sent out on Serial0/1

01:05:23: CDP-PA: version 2 packet sent out on Serial0/2

01:05:23: CDP-PA: version 2 packet sent out on Serial0/3

01:05:34: CDP-PA: Packet received from R1 on interface Serial0/1

01:05:34: **Entry  found in cache**

01:05:34: CDP-PA: Packet received from R2 on interface Serial0/2

01:05:34: **Entry  found in cache**

01:05:41: CDP-PA: Packet received from R3 on interface Serial0/3

01:05:41: **Entry  found in cache**

可以查看四台路由器,观察路由表的变化:

R6#show ip route

Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP

       o - ODR, P - periodic downloaded static route

 

Gateway of last resort is not set

 

     1.0.0.0/24 is subnetted, 1 subnets

o       1.1.1.0 [160/1] via 11.11.11.1, 00:00:49, Serial0/1

     2.0.0.0/24 is subnetted, 1 subnets

o       2.2.2.0 [160/1] via 22.22.22.2, 00:00:49, Serial0/2

     33.0.0.0/24 is subnetted, 1 subnets

C       33.33.33.0 is directly connected, Serial0/3

     3.0.0.0/24 is subnetted, 1 subnets

o       3.3.3.0 [160/1] via 33.33.33.3, 00:00:42, Serial0/3

     22.0.0.0/24 is subnetted, 1 subnets

C       22.22.22.0 is directly connected, Serial0/2

     11.0.0.0/24 is subnetted, 1 subnets

C       11.11.11.0 is directly connected, Serial0/1

 

R1#show ip route

Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP

       o - ODR, P - periodic downloaded static route

 

Gateway of last resort is 11.11.11.6 to network 0.0.0.0

 

     1.0.0.0/24 is subnetted, 1 subnets

C       1.1.1.0 is directly connected, Loopback0

     11.0.0.0/24 is subnetted, 1 subnets

C       11.11.11.0 is directly connected, Serial0/1

o*   0.0.0.0/0 [160/1] via 11.11.11.6, 00:00:27, Serial0/1

R1#

 

R2#show ip route

Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP

       o - ODR, P - periodic downloaded static route

 

Gateway of last resort is 22.22.22.6 to network 0.0.0.0

 

     2.0.0.0/24 is subnetted, 1 subnets

C       2.2.2.0 is directly connected, Loopback0

     22.0.0.0/24 is subnetted, 1 subnets

C       22.22.22.0 is directly connected, Serial0/2

o*   0.0.0.0/0 [160/1] via 22.22.22.6, 00:00:13, Serial0/2

R2#

 

R3#show ip route

Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP

       o - ODR, P - periodic downloaded static route

 

Gateway of last resort is 33.33.33.6 to network 0.0.0.0

 

     33.0.0.0/24 is subnetted, 1 subnets

C       33.33.33.0 is directly connected, Serial0/3

     3.0.0.0/24 is subnetted, 1 subnets

C       3.3.3.0 is directly connected, Loopback0

o*   0.0.0.0/0 [160/1] via 33.33.33.6, 00:00:36, Serial0/3


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