Minggu, 18 November 2012

Lab 110. MPLS VPN - PE CE OSPF - Shamlink

Objective : Mempelajari konfigurasi sham-link pada Jaringan MPLS VPN yang menggunakan OSPF sebagai koneksi PE dan CE.

Topologi Lab

Kondisi awal, interface serial antara Router CE1_BRI dan Router CE2_BRI dalam kondisi shutdown, sehingga dari Router CE1_BRI untuk menuju ke Router CE2_BRI akan menggunakan link MPLS nya. Selanjutnya ketika interface serial nya telah aktif kembali maka Router CE1_BRI akan langsung menuju Router CE2_BRI tanpa melalui MPLS nya terlebih dahulu. Hal ini disebabkan oleh :
  • Directly Connected (AD = 0) memiliki AD yang lebih rendah dibandingkan dengan OSPF (AD = 100)
Konfigurasi PE1
!
ip vrf bca.kiri
 rd 65000:2
 route-target export 65000:2
 route-target import 65000:2
!
ip vrf bri.kiri
 rd 65000:1
 route-target export 65000:1
 route-target import 65000:1
!
interface Loopback0
 ip address 1.1.1.1 255.255.255.255
!
interface FastEthernet1/0
 description ###Link to P Router###
 ip address 12.12.12.1 255.255.255.0
 duplex auto
 speed auto
 mpls ip
!
interface FastEthernet1/1
 description ###Link to BCA###
 ip vrf forwarding bca.kiri
 ip address 10.10.10.1 255.255.255.252
 duplex auto
 speed auto
!
interface FastEthernet2/0
 description ###Link to BRI###
 ip vrf forwarding bri.kiri
 ip address 10.10.10.1 255.255.255.252
 duplex auto
 speed auto
!
router ospf 1
 log-adjacency-changes
 network 1.1.1.1 0.0.0.0 area 0
 network 12.12.12.1 0.0.0.0 area 0
!
router bgp 65000
 no synchronization
 bgp log-neighbor-changes
 neighbor 3.3.3.3 remote-as 65000
 neighbor 3.3.3.3 update-source Loopback0
 no auto-summary
 !
 address-family vpnv4
  neighbor 3.3.3.3 activate
  neighbor 3.3.3.3 send-community extended
 exit-address-family
!
Konfigurasi P Router 
 !
interface Loopback0
 ip address 2.2.2.2 255.255.255.255
!
interface FastEthernet1/0
 description ###Link to PE1 Router###
 ip address 12.12.12.2 255.255.255.0
 duplex auto
 speed auto
 mpls ip
!
interface FastEthernet1/1
 description ###Link to PE2 Router###
 ip address 23.23.23.2 255.255.255.0
 duplex auto
 speed auto
 mpls ip
!
router ospf 1
 log-adjacency-changes
 network 2.2.2.2 0.0.0.0 area 0
 network 12.12.12.2 0.0.0.0 area 0
 network 23.23.23.2 0.0.0.0 area 0
!
Konfigurasi PE2
!
ip vrf bca.kanan
 rd 65000:2
 route-target export 65000:2
 route-target import 65000:2
!
ip vrf bri.kanan
 rd 65000:1
 route-target export 65000:1
 route-target import 65000:1
!
interface Loopback0
 ip address 3.3.3.3 255.255.255.255
!
interface FastEthernet1/0
 description ###Link to P Router###
 ip address 23.23.23.3 255.255.255.0
 duplex auto
 speed auto
 mpls ip
 !
interface FastEthernet1/1
 description ###Link to BRI###
 ip vrf forwarding bri.kanan
 ip address 10.10.10.5 255.255.255.252
 duplex auto
 speed auto
 !
interface FastEthernet2/0
 description ###Link to BCA###
 ip vrf forwarding bca.kanan
 ip address 10.10.10.5 255.255.255.252
 duplex auto
 speed auto
!
router ospf 1
 log-adjacency-changes
 network 3.3.3.3 0.0.0.0 area 0
 network 23.23.23.3 0.0.0.0 area 0
!
router bgp 65000
 no synchronization
 bgp log-neighbor-changes
 neighbor 1.1.1.1 remote-as 65000
 neighbor 1.1.1.1 update-source Loopback0
 no auto-summary
 !
 address-family vpnv4
  neighbor 1.1.1.1 activate
  neighbor 1.1.1.1 send-community extended
 exit-address-family
!

Konfigurasi CE1_BRI

!
interface Loopback1
 ip address 11.11.11.11 255.255.255.255
!
interface FastEthernet1/0
 description ###Link to MPLS###
 ip address 10.10.10.2 255.255.255.252
 duplex auto
 speed auto
!
interface Serial2/0
 ip address 45.45.45.4 255.255.255.0
 serial restart-delay 0
!
router ospf 1
 log-adjacency-changes
 network 0.0.0.0 255.255.255.255 area 0
!

Konfigurasi CE2_BRI
 
!
interface Loopback1
 ip address 22.22.22.22 255.255.255.255
!
interface FastEthernet1/0
 description ###Link to MPLS###
 ip address 10.10.10.6 255.255.255.252
 duplex auto
 speed auto
!
interface Serial2/0
 ip address 45.45.45.5 255.255.255.0
 serial restart-delay 0
!
router ospf 1
 log-adjacency-changes
 network 0.0.0.0 255.255.255.255 area 0
!
Selanjutnya cek kembali rute yang dipilih dari Router CE1_BRI ke RouterCE2_BRI
Ternyata dalam hal ini Router CE1_BRI ke CE2_BRI akan lebih memilih jalur backdoornya yaitu melalui interface serialnya.

Untuk sham link membutuhkan ip loopback /32 terkait dengan sham-link source dan destination nya.
Untuk mengatasi hal tersebut maka konfigurasikan seperti berikut.

Router PE1

Tunggu beberapa saat atau bisa clear ip ospf process dulu. Periksa kembali route tabel nya, pastikan dapat di ping dan coba di traceroute.

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