LAB 9. BGP Attribute ( Community LIST )
Selain menggunakan teknik sebelumnya, kita juga bisa menggunakan numerik community, terlebih dahulu kita hapus konfig BGP dan EIGRP pada lab sebelumnya.
R1,R4,R3
R1(config)#no router eigrp 10
R2(config)#no router eigrp 10 R1(config)#no router bgp 12
R2(config)#no router bgp 12
R3(config)#no router eigrp 10 R3(config)#no router bgp 3
R4(config)#no router bgp 4
Konfigurasikan BGP pada semua router
R1
R1(config)#router bgp 1
R1(config-router)#neighbor 12.12.12.2 remote-as 2
R1(config-router)#exit
R2
R2(config)#router bgp 2
R2(config-router)#neighbor 12.12.12.1 remote-as 1
R2(config-router)#neighbor 23.23.23.3 remote-as 3
R2(config-router)#neighbor 24.24.24.4 remote-as 4
R3
R3(config)#router bgp 3
R3(config-router)#neighbor 23.23.23.2 remote-as 2
R4
R4(config)#router bgp 4
R4(config-router)#neighbor 24.24.24.2 remote-as 2
R4(config-router)#network 4.4.4.4 mask 255.255.255.255 R4(config-router)#exit
Kita cek apakah R2 (ISP 2) mendapatkan prefix dari customer (R4)
R2(config)#do sh ip bgp
Network	Next Hop	Metric LocPrf Weight Path
*> 4.4.4.4/32 24.24.24.4 0 0 4 i
sekarang kita lanjut konfigurasi communitynya.
R2
R2(config)#ip community-list 1 permit 2:24 R2(config)#route-map P
R2(config)#route-map PREPEND permit R2(config-route-map)#match community 1
R2(config-route-map)#set as prepend 2 2 2 2 R2(config-route-map)#exit
R2(config)#route-map PREPEND permit 20
Kemudian kita terapkan ke R3 (ISP3)
R2
R2(config)#router bgp 2
R2(config-router)#neighbor 23.23.23.3 route-map PREPEND out
R2(config-router)#exit
Kemudian config di bagian customer
R4
R4(config)#ip prefix-list Loopback permit 4.4.4.4/32
R4(config)#route-map PREPEND_COMMUNITY permit 10
R4(config-route-map)#match ip address prefix-list LOOPBACK
R4(config-route-map)#set community 2:24R4(config-route-map)#exit
R4(config)#route-map PREPEND_COMMUNITY permit 20 R4(config-route-map)#exit
R4(config)#router bgp 4
R4(config-router)#neighbor 24.24.24.2 route-map PREPEND_COMMUNITY out
R4(config-router)#neighbor 24.24.24.2 send-community R4(config-router)#exit
R4(config)#do clear ip bgp *
Kita verifikasi pada R2
R2
R2(config)#do show ip bgp 4.4.4.4
BGP routing table entry for 4.4.4.4/32, version 7
Paths: (1 available, best #1, table Default-IP-Routing-Table) Flag: 0x820
Advertised to update-groups:
1	2
24.24.24.4 from 24.24.24.4 (4.4.4.4)
Origin IGP, metric 0, localpref 100, valid, external, best
Community: 131096

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