LAB 6. BGP Route Reflector

 LAB 6. BGP Route Reflector

Pada i-BGP, peernya harus full mesh artinya.

•     R1 peers ke R2, R3, R4

•     R2 peers ke R1, R3, R4

•     R3 peers ke R1, R2, R4

•     R4 peers ke R1, R2, R3

Kita membuat Route Reflector agar ketika ada router baru, satu persatu tidak harus peers ke R1, R2, R3 dan R4. Solusinya yaitu menjadikan salah satu routernya menjadi route reflector. Hapus konfigurasi BGP pada lab sebelumnya dan tambahkan 1 router baru.

R1 & R2:

Router-1(config)#no router bgp 12

Router-2(config)#no router bgp 12

R3:

Router-3(config)#no router bgp 3

Setelah itu kita konfigurasi IP pada R3 dan R4.

R3:

Router-3(config)#int f1/0

Router-3(config-if)#ip add 34.34.34.3 255.255.255.0

Router-3(config-if)#no shutdown

R4:

Router-4(config)#int fa0/0

Router-4(config-if)#ip add 34.34.34.4 255.255.255.0

Router-4(config-if)#no sh

Router-4(config-if)#ex

Router-4(config)#int loopback 0

Router-4(config-if)#ip add 4.4.4.4 255.255.255.255

Router-4(config-if)#ex

Kita konfigurasi BGP dan EIGRP Routingnya pada masing-masing router.

R1:

Router-4(config)#router eigrp 10

Router-4(config-router)#network 1.1.1.1 0.0.0.0

Router-4(config-router)#network 12.12.12.1 0.0.0.0

Router-4(config-router)#no auto-summary

Router-4(config-router)#ex

Router-4(config)#router bgp 1234

Router-4(config-router)#neighbor 2.2.2.2 remote-as 1234

Router-4(config-router)#neighbor 2.2.2.2 update lo0

Router-4(config-router)#neighbor 2.2.2.2 route-reflector-client

Router-4(config-router)#neighbor 3.3.3.3 remote-as 1234

Router-4(config-router)#neighbor 3.3.3.3 update lo0

Router-4(config-router)#neighbor 3.3.3.3 route-reflector-client

Router-1(config-router)#neighbor 4.4.4.4 remote-as 1234

Router-1(config-router)#neighbor 4.4.4.4 update lo0

Router-1(config-router)#neighbor 4.4.4.4 route-reflector-client

Router-1(config-router)#ex

R2:

Router-2(config)#router eigrp 10

Router-2(config-router)#network 2.2.2.2 0.0.0.0

Router-2(config-router)#network 12.12.12.2 0.0.0.0

Router-2(config-router)#network 23.23.23.2 0.0.0.0

Router-2(config-router)#no auto-summary

Router-2(config-router)#ex

Router-2(config)#router bgp 1234

Router-2(config-router)#neighbor 1.1.1.1 remote-as 1234

Router-2(config-router)#neighbor 1.1.1.1 update-source lo0

Router-2(config-router)#ex

R3:

Router-3(config)#router eigrp 10

Router-3(config-router)#network 3.3.3.3 0.0.0.0

Router-3(config-router)#network 23.23.23.3 0.0.0.0

Router-3(config-router)#network 34.34.34.3 0.0.0.0

Router-3(config-router)#no auto-summary

Router-3(config-router)#ex

Router-3(config)#router bgp 1234

Router-3(config-router)#neighbor 1.1.1.1 remote-as 1234

Router-3(config-router)#neighbor 1.1.1.1 update-source lo0

Router-3(config-router)#ex

R4:

Router-4(config)#router eigrp 10

Router-4(config-router)#network 4.4.4.4 0.0.0.0

Router-4(config-router)#network 34.34.34.4 0.0.0.0

Router-4(config-router)#no auto-summary

Router-4(config-router)#ex

Router-4(config)#router bgp 1234

Router-4(config-router)#neighbor 1.1.1.1 remote-as 1234

Router-4(config-router)#neighbor 1.1.1.1 update-source lo0

Router-4(config-router)#ex

Pengecekan :

R1:

Router-1(config)#do 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       0       0        0    0    0 never    Active

3.3.3.3         4       1234       0       0        0    0    0 never    Idle

4.4.4.4         4       1234       0       0        0    0    0 never    Active

Router-1(config)#

R2:

Router-2(config)#do 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       0       0        0    0    0 never    Active

Router-2(config)#

Sebagai pengetesan, kita advertise suatu route di salah satu router dan kita pastikan bisa ping dari semua router.

R4:

Router-4(config)#int loopback 44

Router-4(config-if)#ip add 44.44.44.44 255.255.255.255

Router-4(config-if)#router bgp 1234

Router-4(config-router)#network 44.44.44.44 mask 255.255.255.255

Router-4(config-router)#ex

Kita cek pada setiap router mengenai route yang diadvertise oleh R4

R1:

Router-1(config)#do sh ip bgp 44.44.44.44

BGP routing table entry for 44.44.44.44/32, version 2

Paths: (1 available, best #1, table Default-IP-Routing-Table)

Flag: 0x820

  Advertised to update-groups:

        2

  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

Router-1(config)#

R3:

Router-3#show ip bgp 44.44.44.44

BGP routing table entry for 44.44.44.44/32, version 2

Paths: (1 available, best #1, table Default-IP-Routing-Table)

  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

Router-3#

Kita cek ping.

R2:

Router-2#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 = 16/32/56 ms

Router-2#