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1、路由反射器解析
路由反射器工作原理：
RR從EBGP收到的路由，會反射給客戶端和非客戶端
RR從客戶端收到的路由，會反射給客戶端、EBGP鄰居和非客戶端
RR從非客戶端收到的路由，只會反射給客戶端和EBGP鄰居，不會反射給非客戶端
2、實驗拓撲
3、基礎配置
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
interface Loopback0
ip address 2.2.2.2 255.255.255.0
interface Serial0/0
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
no synchronization
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
no auto-summary
R3配置
interface Loopback0
ip address 3.3.3.3 255.255.255.0
interface Serial0/0
ip address 34.1.1.3 255.255.255.0
interface Serial0/1
ip address 23.1.1.3 255.255.255.0
router ospf 110
router-id 3.3.3.3
network 3.3.3.0 0.0.0.255 area 0
network 23.1.1.0 0.0.0.255 area 0
network 34.1.1.0 0.0.0.255 area 0
router bgp 2
no synchronization
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
no auto-summary
R4配置
interface Loopback0
ip address 4.4.4.4 255.255.255.0
interface Serial0/0
ip address 34.1.1.4 255.255.255.0
router ospf 110
router-id 4.4.4.4
network 4.4.4.0 0.0.0.255 area 0
network 34.1.1.0 0.0.0.255 area 0
router bgp 2
no synchronization
bgp router-id 4.4.4.4
neighbor 3.3.3.3 remote-as 2
neighbor 3.3.3.3 update-source Loopback0
no auto-summary
4、水平分割導致的問題
5、配置路由反射器解決水平分割
R3配置
router bgp 2
neighbor 2.2.2.2 route-reflector-client
neighbor 4.4.4.4 route-reflector-client
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