BGP Route Reflector

Kelemahan fullmesh

• Semakin banyak router, semakin banyak konfigurasi
• Jumlah session yang dibuat n(n-1)/2, semakin banyak session membuat overhead
• Memperbesar bgp table size

RR memungkinkan mengadvertise route yang dikirim oleh router iBGP ke router iBGP lain.
Originator ID dan Cluster ID digunakan untuk mencegah loop.


Semua client hanya peering ke server dan server peering ke semua client.

R1(config)#no router bgp 1234 R1(config)#router bgp 1234 R1(config-router)# neighbor 3.3.3.3 remote-as 1234 R1(config-router)# neighbor 3.3.3.3 update-source Loopback0 R1(config-router)# neighbor 3.3.3.3 password 5 CCIE123 R1(config-router)# network 11.11.11.11 mask 255.255.255.255 R2(config)#no router bgp 1234 R2(config)#router bgp 1234 R2(config-router)# neighbor 3.3.3.3 remote-as 1234 R2(config-router)# neighbor 3.3.3.3 update-source Loopback0 R2(config-router)# neighbor 3.3.3.3 password 5 CCIE123 R3(config)#no router bgp 1234 R3(config)#router bgp 1234 R3(config-router)# neighbor 1.1.1.1 remote-as 1234 R3(config-router)# neighbor 1.1.1.1 password 5 CCIE123 R3(config-router)# neighbor 1.1.1.1 update-source Loopback0 R3(config-router)# neighbor 1.1.1.1 route-reflector-client R3(config-router)# neighbor 2.2.2.2 remote-as 1234 R3(config-router)# neighbor 2.2.2.2 password 5 CCIE123 R3(config-router)# neighbor 2.2.2.2 update-source Loopback0 R3(config-router)# neighbor 2.2.2.2 route-reflector-client R3(config-router)# neighbor 4.4.4.4 remote-as 1234 R3(config-router)# neighbor 4.4.4.4 password 5 CCIE123 R3(config-router)# neighbor 4.4.4.4 update-source Loopback0 R3(config-router)# neighbor 4.4.4.4 route-reflector-client R4(config)#no router bgp 1234 R4(config)#router bgp 1234 R4(config-router)# neighbor 3.3.3.3 remote-as 1234 R4(config-router)# neighbor 3.3.3.3 update-source Loopback0 R4(config-router)# neighbor 3.3.3.3 password 5 CCIE123

Dari R1,R2 dan R4 hanya peering ke R3 saja. R3 peering ke semua router.

R3#sh ip bgp sum Neighbor        V           AS MsgRcvd MsgSent   TblVer  InQ OutQ Up/Down  State/PfxRcd 3.3.3.3         4         1234       7       4        2    0    0 00:01:14        1 R4#sh ip bgp         Network          Next Hop            Metric LocPrf Weight Path  *>i 11.11.11.11/32   1.1.1.1                  0    100      0 i R4#ping 11.11.11.11 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 11.11.11.11, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 5/5/5 ms