pada posting ini kita akan membahas bagaimana dalam BGP, kita bisa tidak mengadvertise network keluar AS dari AS diri sendiri.
R1
interface Loopback0
ip address 1.1.1.1 255.255.255.255
!
interface Loopback1
ip address 11.11.11.11 255.255.255.255
!
interface FastEthernet0/0
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
neighbor 2.2.2.2 send-community both
neighbor 2.2.2.2 route-map NO-EXPORT out
no auto-summary
access-list 1 permit 11.11.11.11
route-map NO-EXPORT permit 10
match ip address 1
set community no-export
R2
interface Loopback0
ip address 2.2.2.2 255.255.255.255
!
interface Loopback1
ip address 22.22.22.22 255.255.255.255
!
interface FastEthernet0/0
ip address 12.12.12.2 255.255.255.0
duplex auto
speed auto
!
interface Serial0/0
ip address 24.24.24.2 255.255.255.0
clock rate 2000000
!
interface FastEthernet0/1
ip address 23.23.23.2 255.255.255.0
duplex auto
speed auto
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
no auto-summary
!
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 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
!
ip route 33.33.33.33 255.255.255.255 23.23.23.3
R3
interface Loopback0
ip address 3.3.3.3 255.255.255.255
!
interface Loopback1
ip address 33.33.33.33 255.255.255.255
!
interface Loopback2
ip address 30.30.30.3 255.255.255.255
!
interface FastEthernet0/0
no ip address
shutdown
duplex auto
speed auto
!
interface FastEthernet0/1
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
no auto-summary
!
router rip
version 2
network 30.0.0.0
network 33.0.0.0
no auto-summary
!
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
R4
interface Loopback0
ip address 4.4.4.4 255.255.255.255
!
interface FastEthernet0/0
no ip address
shutdown
duplex auto
speed auto
!
interface Serial0/0
ip address 24.24.24.4 255.255.255.0
clock rate 2000000
!
interface FastEthernet0/1
no ip address
shutdown
duplex auto
speed auto
!
interface Serial0/1
no ip address
shutdown
clock rate 2000000
!
interface Serial0/2
no ip address
shutdown
clock rate 2000000
!
interface Serial0/3
no ip address
shutdown
clock rate 2000000
!
router bgp 4
no synchronization
bgp log-neighbor-changes
network 4.4.4.4 mask 255.255.255.255
neighbor 24.24.24.2 remote-as 123
no auto-summary
!
!
sebelum kita pasang route-map NO-EXPORT out di R1, hasilnya seperti ini kalo kita lihat sh ip bg di R4
Network Next Hop Metric LocPrf Weight Path
Network Next Hop Metric LocPrf Weight Path
*> 4.4.4.4/32 0.0.0.0 0 32768 i
*>11.11.11.11/32 24.24.24.2 0 0 123 i
*> 22.22.22.22/32 24.24.24.2 0 0 123 i
*> 33.33.33.33/32 24.24.24.2 0 123 i
setelah kita lakukan route-map NO-EXPORT out di R1, seperti contoh diatas, maka di R4 hanya muncul network :
Network Next Hop Metric LocPrf Weight Path
*> 4.4.4.4/32 0.0.0.0 0 32768 i
*> 22.22.22.22/32 24.24.24.2 0 0 123 i
*> 33.33.33.33/32 24.24.24.2 0 123 i
ok, i will continue to the next post..see u
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