Lab 97. BGP Attribute (Community)

Objective :

• Mempelajari salah satu atribut pada BGP yakni community
• Attribute Community terbagi menjadi 4 yakni no-export, no-advertise, internet dan local-as

Topologi Lab

Konfigurasi R1

!
interface Loopback0
 ip address 1.1.1.1 255.255.255.255
!
interface Loopback11
 ip address 11.11.11.11 255.255.255.255
!
interface FastEthernet1/0
 ip address 12.12.12.1 255.255.255.0
 duplex auto
 speed auto
 !
router eigrp 1
 network 1.1.1.1 0.0.0.0
 network 12.12.12.1 0.0.0.0

no auto-summary
!
router bgp 123
 no synchronization
 bgp log-neighbor-changes
 network 11.11.11.11 mask 255.255.255.255
 neighbor 2.2.2.2 remote-as 123
 neighbor 2.2.2.2 update-source Loopback0
 no auto-summary
!

Konfigurasi R2

!
interface Loopback0
 ip address 2.2.2.2 255.255.255.255
 !
interface Loopback22
 ip address 22.22.22.22 255.255.255.255
 !
interface FastEthernet1/0
 ip address 12.12.12.2 255.255.255.0
 duplex auto
 speed auto
 !
interface FastEthernet1/1
 ip address 23.23.23.2 255.255.255.0
 duplex auto
 speed auto
 !
interface Serial2/0
 ip address 24.24.24.2 255.255.255.0
 serial restart-delay 0
 clock rate 2016000
!
router eigrp 1
 network 2.2.2.2 0.0.0.0
 network 12.12.12.2 0.0.0.0
 network 23.23.23.2 0.0.0.0
!
router bgp 123
 no synchronization
 bgp log-neighbor-changes
 network 22.22.22.22 mask 255.255.255.255
 neighbor 1.1.1.1 remote-as 123
 neighbor 1.1.1.1 update-source Loopback0
 neighbor 1.1.1.1 route-reflector-client
 neighbor 1.1.1.1 next-hop-self
 neighbor 3.3.3.3 remote-as 123
 neighbor 3.3.3.3 update-source Loopback0
 neighbor 3.3.3.3 route-reflector-client
 neighbor 3.3.3.3 next-hop-self
 neighbor 24.24.24.4 remote-as 4
 no auto-summary
!

Konfigurasi R3

!
interface Loopback0
 ip address 3.3.3.3 255.255.255.255
 !
interface Loopback33
 ip address 33.33.33.33 255.255.255.255
!
interface FastEthernet1/0
 ip address 23.23.23.3 255.255.255.0
 duplex auto
 speed auto
 !

router eigrp 1
 network 3.3.3.3 0.0.0.0
 network 23.23.23.3 0.0.0.0
!
router bgp 123
 no synchronization
 bgp log-neighbor-changes
 network 33.33.33.33 mask 255.255.255.255
 neighbor 2.2.2.2 remote-as 123
 neighbor 2.2.2.2 update-source Loopback0
 no auto-summary
!

Konfigurasi R4

!
interface Loopback0
 ip address 4.4.4.4 255.255.255.255
 !
interface Loopback44
 ip address 44.44.44.44 255.255.255.255
!
interface Serial1/0
 ip address 24.24.24.4 255.255.255.0
 serial restart-delay 0
 clock rate 2016000

!
router bgp 4
 no synchronization
 bgp log-neighbor-changes
 network 44.44.44.44 mask 255.255.255.255
 neighbor 24.24.24.2 remote-as 123
 no auto-summary
!

Cek BGP route di Router R1 dan R4

Set community "no-export" di Router R1 (no-export tidak diadvertise ke eBGP)

Cek BGP route di Router R4 pastikan network 11.11.11.11/32 sudah tidak ada

Set community "no-advertise" di Router R3 (no-advertise tidak akan diadvertise ke iBGP/eBGP)

Cek BGP route di Router R1 dan Router R4 dan pastikan network 33.33.33.33/32 sudah tidak ada.

Set community "Local-AS" di Router R1 (diadvertise hanya di confederation iBGP saja). Artinya konfigurasi iBGP (R1,R2,R3) harus dirubah dari Route Reflector menjadi Confederation

Cek BGP route di  Router R3 pastikan network 11.11.11.11/32 sudah tidak ada dikarenakan sudah berbeda AS nya.