48、BGP配置实验之路由反射器

1、路由反射器解析

<a href="http://s2.51cto.com/wyfs02/M01/77/BA/wKioL1ZtG8CyILiMAABfo08QSDI054.png" target="_blank"></a>

路由反射器工作原理：

RR从EBGP收到的路由，会反射给客户端和非客户端

RR从客户端收到的路由，会反射给客户端、EBGP邻居和非客户端

RR从非客户端收到的路由，只会反射给客户端和EBGP邻居，不会反射给非客户端

2、实验拓扑

<a href="http://s4.51cto.com/wyfs02/M01/77/BB/wKiom1ZtHnyhhmM0AABNNUr3ayA046.png" target="_blank"></a>

3、基础配置

R1配置

interface Loopback0

 ip address 1.1.1.1 255.255.255.0

interface Serial0/0

 ip address 12.1.1.1 255.255.255.0

router bgp 1

 no synchronization

 bgp router-id 1.1.1.1

 network 1.1.1.0 mask 255.255.255.0

 neighbor 12.1.1.2 remote-as 2

 no auto-summary

R2配置

 ip address 2.2.2.2 255.255.255.0

 ip address 12.1.1.2 255.255.255.0

interface Serial0/1

 ip address 23.1.1.2 255.255.255.0

router ospf 110

 router-id 2.2.2.2

 network 2.2.2.0 0.0.0.255 area 0

 network 23.1.1.0 0.0.0.255 area 0

router bgp 2

 bgp router-id 2.2.2.2

 neighbor 3.3.3.3 remote-as 2

 neighbor 3.3.3.3 update-source Loopback0

 neighbor 3.3.3.3 next-hop-self

 neighbor 12.1.1.1 remote-as 1

R3配置

 ip address 3.3.3.3 255.255.255.0

 ip address 34.1.1.3 255.255.255.0

 ip address 23.1.1.3 255.255.255.0

 router-id 3.3.3.3

 network 3.3.3.0 0.0.0.255 area 0

 network 34.1.1.0 0.0.0.255 area 0

 bgp router-id 3.3.3.3

 neighbor 2.2.2.2 remote-as 2

 neighbor 2.2.2.2 update-source Loopback0

 neighbor 4.4.4.4 remote-as 2

 neighbor 4.4.4.4 update-source Loopback0

R4配置

 ip address 4.4.4.4 255.255.255.0

 ip address 34.1.1.4 255.255.255.0

 router-id 4.4.4.4

 network 4.4.4.0 0.0.0.255 area 0

 bgp router-id 4.4.4.4

4、水平分割导致的问题

<a href="http://s3.51cto.com/wyfs02/M02/77/BC/wKiom1ZtI8DhweEkAAA6t0yA5yw160.png" target="_blank"></a>

<a href="http://s3.51cto.com/wyfs02/M00/77/BC/wKiom1ZtI8CzMuhaAAAK2Be9_Tw044.png" target="_blank"></a>

5、配置路由反射器解决水平分割

 neighbor 2.2.2.2 route-reflector-client

 neighbor 4.4.4.4 route-reflector-client

<a href="http://s5.51cto.com/wyfs02/M02/77/BC/wKiom1ZtJSGSwruaAABan6qiCgY200.png" target="_blank"></a>

<a href="http://s5.51cto.com/wyfs02/M01/77/BB/wKioL1ZtJSWRPoxvAAAnLDB9W6M969.png" target="_blank"></a>

      本文转自开源殿堂 51CTO博客，原文链接：http://blog.51cto.com/kaiyuandiantang/1722502，如需转载请自行联系原作者