iBGP Peering IOS-XR

Sebelum masuk ke konfigurasi iBGP (disini peering menggunakan loopback), masing-masing loopback harus sudah bisa diping satu sama lain. Maka dari itu kita perlu mengkonfigurasikan IGP terserah apa saja sesuai topologi atau bisa baca tulisan sebelumnya menggunakan OSPF.

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Konfigurasi IDN-R1

RP/0/0/CPU0:IDN-R1(config)#router bgp 100
RP/0/0/CPU0:IDN-R1(config-bgp)#neigh 2.2.2.2
RP/0/0/CPU0:IDN-R1(config-bgp-nbr)#remote-as 100
RP/0/0/CPU0:IDN-R1(config-bgp-nbr)#update-source lo0
RP/0/0/CPU0:IDN-R1(config-bgp-nbr)#neigh 3.3.3.3
RP/0/0/CPU0:IDN-R1(config-bgp-nbr)#remote-as 100
RP/0/0/CPU0:IDN-R1(config-bgp-nbr)#update-source lo0

Konfigurasi IDN-R2

RP/0/0/CPU0:IDN-R2(config)#router bgp 100
RP/0/0/CPU0:IDN-R2(config-bgp)#neigh 1.1.1.1
RP/0/0/CPU0:IDN-R2(config-bgp-nbr)#remote-as 100
RP/0/0/CPU0:IDN-R2(config-bgp-nbr)#update-source lo0
RP/0/0/CPU0:IDN-R2(config-bgp-nbr)#neigh 3.3.3.3
RP/0/0/CPU0:IDN-R2(config-bgp-nbr)#remote-as 100
RP/0/0/CPU0:IDN-R2(config-bgp-nbr)#update-source lo0

Konfigurasi IDN-R3

RP/0/0/CPU0:IDN-R3(config)#router bgp 100
RP/0/0/CPU0:IDN-R3(config-bgp)#neigh 1.1.1.1
RP/0/0/CPU0:IDN-R3(config-bgp-nbr)#remote-as 100
RP/0/0/CPU0:IDN-R3(config-bgp-nbr)#update-source lo0
RP/0/0/CPU0:IDN-R3(config-bgp-nbr)#neigh 2.2.2.2
RP/0/0/CPU0:IDN-R3(config-bgp-nbr)#remote-as 100
RP/0/0/CPU0:IDN-R3(config-bgp-nbr)#update-source lo0

Konfigurasi BGP peernya dengan menambahkan update-source loopback0. bila tidak ditambahkan baris tersebut maka yang digunakan updatenya adalah ip interface physical sehingga bgp adjacency nya akan bermasalah.

Verifikasi

RP/0/0/CPU0:IDN-R1#sh bgp summ
Mon Feb  3 19:41:16.377 UTC
BGP router identifier 1.1.1.1, local AS number 100
BGP generic scan interval 60 secs
BGP table state: Active
Table ID: 0xe0000000   RD version: 0
BGP main routing table version 1
BGP scan interval 60 secs

BGP is operating in STANDALONE mode.

Process       RcvTblVer   bRIB/RIB   LabelVer  ImportVer  SendTblVer  StandbyVer
Speaker               1          1          1          1           1           1

Neighbor        Spk    AS MsgRcvd MsgSent   TblVer  InQ OutQ  Up/Down  St/PfxRcd
2.2.2.2           0   100       5       7        1    0    0 00:02:32          0
3.3.3.3           0   100       5       9        1    0    0 00:02:16          0

RP/0/0/CPU0:IDN-R1#

Pastikan pada bagian State/PfxRcd nya bernilai 0. Kemudian kita akan membuat sebuah loopback interface baru yang nantinya akan kita advertise ke dalam BGP

RP/0/0/CPU0:IDN-R1(config)#int lo1
RP/0/0/CPU0:IDN-R1(config-if)#ip addr 11.11.11.11 255.255.255.255

RP/0/0/CPU0:IDN-R2(config)#int lo1
RP/0/0/CPU0:IDN-R2(config-if)#ip addr 22.22.22.22 255.255.255.255

RP/0/0/CPU0:IDN-R3(config)#int lo1
RP/0/0/CPU0:IDN-R3(config-if)#ip addr 33.33.33.33 255.255.255.255

Kemudian kita akan advertise ke BGP

RP/0/0/CPU0:IDN-R1(config)#router bgp 100
RP/0/0/CPU0:IDN-R1(config-bgp)#address-family ipv4 unicast
RP/0/0/CPU0:IDN-R1(config-bgp-af)#network 11.11.11.11 255.255.255.255

RP/0/0/CPU0:IDN-R2(config)#router bgp 100
RP/0/0/CPU0:IDN-R2(config-bgp)#address-family ipv4 unicast
RP/0/0/CPU0:IDN-R2(config-bgp-af)#network 22.22.22.22 255.255.255.255

RP/0/0/CPU0:IDN-R3(config)#router bgp 100
RP/0/0/CPU0:IDN-R3(config-bgp)#address-family ipv4 unicast
RP/0/0/CPU0:IDN-R3(config-bgp-af)#network 33.33.33.33 255.255.255.255

Verifikasi

Pastikan route tersebut sudah diadvertise sehingga nilai State/PfxRcd nya menjadi 1

RP/0/0/CPU0:IDN-R1#sh bgp summ
Mon Feb  3 19:57:24.830 UTC
BGP router identifier 1.1.1.1, local AS number 100
BGP generic scan interval 60 secs
BGP table state: Active
Table ID: 0xe0000000   RD version: 4
BGP main routing table version 4
BGP scan interval 60 secs

BGP is operating in STANDALONE mode.

Process       RcvTblVer   bRIB/RIB   LabelVer  ImportVer  SendTblVer  StandbyVer
Speaker               4          4          4          4           4           4

Neighbor        Spk    AS MsgRcvd MsgSent   TblVer  InQ OutQ  Up/Down  St/PfxRcd
2.2.2.2           0   100      22      24        4    0    0 00:18:41          1
3.3.3.3           0   100      22      26        4    0    0 00:18:25          1

RP/0/0/CPU0:IDN-R1#

Cek route yang diadvertise ke BGP dan kemudian cek routing tabelnya

RP/0/0/CPU0:IDN-R1#sh ip route
Mon Feb  3 20:00:57.996 UTC

Codes: C - connected, S - static, R - RIP, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
i - ISIS, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, su - IS-IS summary null, * - candidate default
U - per-user static route, o - ODR, L - local, G  - DAGR
A - access/subscriber, a - Application route, (!) - FRR Backup path

Gateway of last resort is not set

L    1.1.1.1/32 is directly connected, 01:47:48, Loopback0
O    2.2.2.2/32 [110/2] via 12.12.12.2, 00:54:03, GigabitEthernet0/0/0/5
O IA 3.3.3.3/32 [110/3] via 12.12.12.2, 00:54:14, GigabitEthernet0/0/0/5
L    11.11.11.11/32 is directly connected, 00:11:57, Loopback1
C    12.12.12.0/24 is directly connected, 01:47:48, GigabitEthernet0/0/0/5
L    12.12.12.1/32 is directly connected, 01:47:48, GigabitEthernet0/0/0/5
B    22.22.22.22/32 [200/0] via 2.2.2.2, 00:06:52
O IA 23.23.23.0/24 [110/2] via 12.12.12.2, 00:56:49, GigabitEthernet0/0/0/5
B    33.33.33.33/32 [200/0] via 3.3.3.3, 00:05:52
RP/0/0/CPU0:IDN-R1#

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