CCNP - BGP Router Reflector
Lab 6 Router Reflector
Route reflector sebenarnya adalah router BGP yang diperbolehkan untuk melanggar aturan seperti ditulis diatas. Route reflector dapat melakukan routing update yang diperoleh dari iBGP peer ke iBGP peer yang lain dalam kondisi tertentu. Dengan cara ini, maka kebutuhan untuk topologi full-mesh dapat diatasi dan jaringan dapat diperbesar dengan mudah
Jenis peer ada 3,
-eBGP perr
-Router reflector peer
-Router reflector non client peer
Untuk topologi kita pakai 4 router
Langsung saja kita mulai
Pada i-BGP peernya harus full mesh
• R1 peers ke R2, R3, R4
• R2 peers ke R1, R3, R4
• R3 peers ke R1, R2, R4
• R4 peers ke R1, R2, R3
Konfig IP pada router 3 dan 4, untuk router 1 dan 2 masih sama seperti sebelumnya
R3(config)#int ra f1/0, f0/0
R3(config-if-range)#no shutdown
R3(config-if-range)#int f0/0
R3(config-if)#ip address 23.23.23.2 255.255.255.0
R3(config-if)#int f1/0
R3(config-if)#ip add 34.34.34.3 255.255.255.0
Konfigurasi BGP dan EIGRP pada router masing masing
R1(config)#router eigrp 10
R1(config-router)#network 1.1.1.1 0.0.0.0
R1(config-router)#network 12.12.12.1 0.0.0.0
R1(config-router)#no auto-summary
R1(config-router)#exit
R1(config)#router bgp 1234
R1(config-router)#neighbor 2.2.2.2 remote-as 1234
R1(config-router)#neighbor 2.2.2.2 update lo0
R1(config-router)#neighbor 2.2.2.2 route-reflector-client
R1(config-router)#neighbor 3.3.3.3 remote-as 1234
R1(config-router)#neighbor 3.3.3.3 update lo0
R1(config-router)#neighbor 3.3.3.3 route-reflector-client
R1(config-router)#neighbor 4.4.4.4 remote-as 1234
R1(config-router)#neighbor 4.4.4.4 update lo0
R1(config-router)#neighbor 4.4.4.4 route-reflector-client
R1(config-router)#exit
R2(config)#router eigrp 10
R2(config-router)#network 2.2.2.2 0.0.0.0
R2(config-router)#network 12.12.12.2 0.0.0.0
R2(config-router)#network 23.23.23.2 0.0.0.0
R2(config-router)#no auto-summary
R2(config)#router bgp 1234
R2(config-router)#neighbor 1.1.1.1 remote-as 1234
R2(config-router)#neighbor 1.1.1.1 update-source lo0
R2(config-router)#exit
R3(config)#router eigrp 10
R3(config-router)#network 23.23.23.3 0.0.0.0
R3(config-router)#network 34.34.34.3 0.0.0.0
R3(config-router)#network 3.3.3.3 0.0.0.0
R3(config-router)#no auto-summary
R3(config-router)#exit
R3(config)#router bgp 1234
R3(config-router)#neighbor 1.1.1.1 remote-as 1234
R3(config-router)#neighbor 1.1.1.1 update-source lo0
R4(config)#router eigrp 10
R4(config-router)#network 4.4.4.4 0.0.0.0
R4(config-router)#network 34.34.34.4 0.0.0.0
R4(config-router)#no auto-summary
R4(config-router)#exit
R4(config)#router bgp 1234
R4(config-router)#neighbor 1.1.1.1 remote-as 1234
R4(config-router)#neighbor 1.1.1.1 update-source lo0
R4(config-router)#exit
Terakhir kita cek di semua router
R1#sh ip bgp summary
BGP router identifier 11.11.11.11, local AS number 1234
BGP table version is 1, main routing table version 1
Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down
State/PfxRcd
2.2.2.2 4 1234 4 4 1 0 0 00:02:33 0
3.3.3.3 4 1234 4 4 1 0 0 00:02:31 0
4.4.4.4 4 1234 4 4 1 0 0 00:02:34 0
R2#sh ip bgp summary
BGP router identifier 22.22.22.22, local AS number 1234
BGP table version is 1, main routing table version 1
Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down
State/PfxRcd
1.1.1.1 4 1234 10 10 1 0 0 00:08:58 0
Pengetesan, kita harus advertise suatu route di salah satu router dan kita pastikan bisa ping dari semua router.
R4(config)#interface Loopback44
R4(config-if)#ip address 44.44.44.44 255.255.255.255
R4(config)#router bgp 1234
R4(config-router)#network 44.44.44.44 mask 255.255.255.255
Setelah itu kita cek lagi di semua router
R1#sh ip bgp 44.44.44.44
BGP routing table entry for 44.44.44.44/32, version 3
Paths: (1 available, best #1, table Default-IP-Routing-Table, RIB-failure(17))
Flag: 0x820
Advertised to update-groups:
1
Local, (Received from a RR-client)
4.4.4.4 (metric 161280) from 4.4.4.4 (44.44.44.44)
Origin IGP, metric 0, localpref 100, valid, internal, best
R3#sh ip bgp 44.44.44.44
BGP routing table entry for 44.44.44.44/32, version 3
Paths: (1 available, best #1, table Default-IP-Routing-Table, RIB-failure(17))
Flag: 0x820
Not advertised to any peer
Local
4.4.4.4 (metric 156160) from 1.1.1.1 (11.11.11.11)
Origin IGP, metric 0, localpref 100, valid, internal, best
Originator: 44.44.44.44, Cluster list: 11.11.11.11
R2#ping 44.44.44.44
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 44.44.44.44, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 28/32/36 ms
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