Cisco | BGP - Synchronization

 

Untuk sekarang secara default synchronization sudah di disable. Pada gambar diatas kita bisa melihat terdapat 5 router dan 3 AS yang berbeda. Ketika kita menghubungkan router R5 dan R3 akan melewati AS 10 sebagai AS transit. iBGP dikonfigurasi antara R1 dan R2 sedangkan router R4 tidak menjalankan BGP melainkan routing OSPF. Maka dari itu supaya R1 dan R2 dapat membentuk sesi peer internal BGP, dan dapat berkomuniasi dengan mendistribusikan prefix masing IP loop  nya, maka dibutuhkan beberapa step konfigurasi.

!hostname R1
!
interface Loopback0
 ip address 172.16.1.1 255.255.255.0
!
interface Loopback1
 ip address 172.16.11.1 255.255.255.0
!
interface Ethernet0/0
 ip address 12.12.12.1 255.255.255.252
 ip ospf network point-to-point
 no shut
!
interface Ethernet0/2
 ip address 14.14.14.1 255.255.255.252
no shut
!
router ospf 1
 network 12.12.12.0 0.0.0.3 area 0
!
router bgp 10
 bgp router-id 172.16.1.1
 bgp log-neighbor-changes
 network 172.16.1.0 mask 255.255.255.0
 network 172.16.11.0 mask 255.255.255.0
 neighbor 14.14.14.2 remote-as 40
 neighbor 15.15.15.1 remote-as 10
!
hostname R2
interface Loopback0
 ip address 172.16.2.1 255.255.255.0
!
interface Loopback1
 ip address 172.16.22.1 255.255.255.0
!
interface Ethernet0/0
 ip address 15.15.15.1 255.255.255.252
 ip ospf network point-to-point
 duplex auto
!
interface Ethernet0/1
 ip address 13.13.13.2 255.255.255.252
 duplex auto
!
router ospf 1
 network 15.15.15.0 0.0.0.3 area 0
!
router bgp 10
 bgp router-id 172.16.2.1
 bgp log-neighbor-changes
 network 172.16.2.0 mask 255.255.255.0
 network 172.16.22.0 mask 255.255.255.0
 neighbor 12.12.12.1 remote-as 10
 neighbor 13.13.13.1 remote-as 30
!
hostname R3
!
interface Loopback0
 ip address 172.16.33.1 255.255.255.0
!
interface Loopback1
 ip address 172.16.3.1 255.255.255.0
!
interface Ethernet0/0
 ip address 13.13.13.1 255.255.255.252
 no shut
!
interface Ethernet0/1
 ip address 14.14.14.2 255.255.255.252
  no shut
!
router bgp 30
 bgp router-id 172.16.3.1
 bgp log-neighbor-changes
 network 172.16.3.0 mask 255.255.255.0
 network 172.16.33.0 mask 255.255.255.0
 neighbor 13.13.13.2 remote-as 10
!
hostname R5
!
interface Loopback0
 ip address 172.16.5.1 255.255.255.0
!
interface Loopback1
 ip address 172.16.55.1 255.255.255.0
!
interface Ethernet0/0
 ip address 14.14.14.2 255.255.255.252
 duplex auto
!
interface Ethernet0/1
 no ip address
 shutdown
 duplex auto
!
interface Ethernet0/2
 no ip address
 shutdown
 duplex auto
!
interface Ethernet0/3
 no ip address
 shutdown
 duplex auto
!
router bgp 40
 bgp log-neighbor-changes
 network 172.16.5.0 mask 255.255.255.0
 network 172.16.55.0 mask 255.255.255.0
 neighbor 14.14.14.1 remote-as 10
!
hostname R4
!
interface Ethernet0/0
 ip address 12.12.12.2 255.255.255.252
 ip ospf network point-to-point
 ip ospf 1 area 0
 duplex auto
!
interface Ethernet0/1
 ip address 15.15.15.2 255.255.255.252
 ip ospf network point-to-point
 ip ospf 1 area 0
exit
!
router ospf 1
!
interface Loopback0
 ip address 10.1.1.4 255.255.255.255
!

LALU TAMBHKAN KONFIGURASI BERIKUT INI

R1

route-map ACL-20 permit 10
 match ip address 20
!
route-map ACL-10 permit 10
 match ip address 10
!
access-list 10 permit 172.16.5.0 0.0.0.255
access-list 10 permit 172.16.55.0 0.0.0.255
!
access-list 20 permit 12.12.12.0 0.0.0.3
access-list 20 permit 15.15.15.0 0.0.0.3
!

router bgp 10
 synchronization
 redistribute ospf 1 route-map ACL-20

!
router ospf 1
 redistribute connected subnets
 redistribute bgp 10 subnets route-map ACL-10
!
R2

router ospf 1
 redistribute connected subnets
!
router bgp 10
 synchronization
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