Route Reflectors

Route reflectors

BGP requires that all BGP peers in the same autonomous system form an iBGP session with each others. This is too difficult in many environments. Route reflectors are fully functional iBGP speakers that form iBGP sessions with other iBGP speakers, and they also perform a second function – they forward routes from other iBGP speakers to route reflector clients. The route reflector clients and clients form a cluster.

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R3(config-router)# router bgp 65000
R3(config-router)# neighbor 198.18.13.1 remote-as 65000
R3(config-router)# neighbor 198.18.13.1
route-reflector-client//add neighbor 198.18.13.1 and tell him “I’m your route reflector”

R3(config-router)# neighbor 198.18.23.2 remote-as 65000
R3(config-router)# neighbor 198.18.23.2 route-reflector-client
R3(config-router)# neighbor 198.18.34.4 remote-as 65000
R3(config-router)# neighbor 198.18.34.4 route-reflector-client
R3(config-router)# neighbor 198.18.35.5 remote-as 65000
R3(config-router)# neighbor 198.18.35.5 route-reflector-client

 

 

R4(config-router)# do show ip bgp | begin Network
   Network          Next Hop            Metric LocPrf Weight Path
*>i198.18.111.1/32  198.18.13.1              0    100      0 i
*>i198.18.222.2/32  198.18.23.2              0    100      0 i

 

R5(config-router)# do show ip bgp | begin Network
   Network          Next Hop            Metric LocPrf Weight Path
*>i198.18.111.1/32  198.18.13.1              0    100      0 i
*>i198.18.222.2/32  198.18.23.2              0    100      0 i

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