Lab 14. BGP Weight

Assalamu'alaikum Warohmatullahi Wabarokatuh...
baik sahabat configer kali ini saya akan sedikit sharing mengenai BGP Weight untuk topologinya seperti ini :

attribut weight pada BGP berfungsi untuk mengatur trafik upstream yang keluar dari 1 BGP router semakin tinggi nilai weight maka rute semakin di prioritaskan, pada lab kali ini kita akan mempelajari best path selection yang ditentukan oleh attribut weight.
oke kita langsung saja ke kkonfigurasinya :
Konfigurasi R1

[admin@MikroTik] > sys identity set name=R1
[admin@R1] > ip ad ad ad 12.12.12.1/24 interface=ether1
[admin@R1] > ip ad ad ad 14.14.14.1/24 interface=ether2
[admin@R1] > routing bgp instance set default as=100 redistribute-connected=yes
[admin@R1] > routing bgp peer add name=peer1 remote-address=12.12.12.2 remote-as=200
[admin@R1] > routing bgp peer add name=peer2 remote-address=14.14.14.4 remote-as=400

Konfigurasi R2

[admin@MikroTik] > sys identity set name=R2
[admin@R2] > int br ad nam bridge1
[admin@R2] > ip ad ad ad 12.12.12.2/24 interface=ether1
[admin@R2] > ip ad ad ad 23.23.23.2/24 interface=ether2
[admin@R2] > ip ad ad ad 2.2.2.2/32 interface=bridge1
[admin@R2] > routing bgp instance set default as=200 redistribute-connected=yes
[admin@R2] > routing bgp peer add name=peer1 remote-address=12.12.12.1 remote-as=100
[admin@R2] > routing bgp peer add name=peer2 remote-address=23.23.23.3 remote-as=300 in-filter=weight

Konfigurasi R3

[admin@MikroTik] > sys identity set name=R3
[admin@R3] > int br ad nam bridge1
[admin@R3] > ip ad ad ad 23.23.23.3/24 interface=ether1
[admin@R3] > ip ad ad ad 34.34.34.3/24 interface=ether2        
[admin@R3] > routing bgp instance set default as=300 redistribute-connected=yes
[admin@R3] > routing bgp peer add name=peer1 remote-address=23.23.23.2 remote-as=200
[admin@R3] > routing bgp peer add name=peer2 remote-address=34.34.34.4 remote-as=400

Konfigurasi R4

[admin@MikroTik] > system identity set name=R4
[admin@R4] > int br ad nam bridge1
[admin@R4] > ip ad ad ad 34.34.34.4/24 interface=ether1
[admin@R4] > ip ad ad ad 14.14.14.4/24 interface=ether2
[admin@R4] > ip ad ad ad 192.168.4.1/24 interface=bridge1
[admin@R4] > routing bgp instance set default as=300 redistribute-connected=yes
[admin@R4] > routing bgp peer add name=peer1 remote-address=14.14.14.1 remote-as=100
[admin@R4] > routing bgp peer add name=peer2 remote-address=34.34.34.3 remote-as=300 

sekarang kita coba traceroute dari R2 ke net 4.4.4.0/24

[admin@R2] > tool traceroute 4.4.4.4 src-address=2.2.2.2
# ADDRESS     LOSS   SENT   LAST   AVG   BEST   WORST   STD-DEV   STATUS
1 12.12.12.1   0%     5      0.9ms 0.9    0.8   0.9      0
2 4.4.4.4      0%     5      1.4ms 1.6    1.1   2.6      0.5

Bisa kita lihat diatas route ke network 4.4.4.4 terlebih dahulu melewati R1 (12.12.12.1)

Sekarang kita akan merubahnya supaya melalui R3 dengan cara mengubah nilai BGP Weight untuk route address 4.4.4.4/24 dan di assign di BGP Peer yang menuju ke R2, default dari nilai weight adalah 0 dan kita akan merubahna menjadi 10 agar lebih tinggi dari weight route yang menuju ke R1

[admin@R2] > routing filter add chain=weight prefix=4.4.4.0/24 set-bgp-weight=10

Sekarang kita cek lakukkan trace ke net 4.4.4.4/24 bisa kita lihat dibawah sekarang trafiknya terlebih dahulu melalui ip 23.23.23.3 (R3).

[admin@R2] > tool traceroute 4.4.4.4 src-address=2.2.2.2
# ADDRESS LOSS SENT LAST AVG BEST WORST STD-DEV STATUS
1 23.23.23.3 0% 6 0.8ms 0.9 0.7 1 0.1
2 4.4.4.4 0% 6 1.3ms 1.9 1.1 4.5 1.2

[admin@R2] > ip route print detail where dst-address=4.4.4.0/24
Flags: X - disabled, A - active, D - dynamic, C - connect, S - static, r - rip, b - bgp, o - ospf, m - mme, B - blackhole, U - unreachable, P - prohibit
0 ADb dst-address=4.4.4.0/24 gateway=23.23.23.3 gateway-status=23.23.23.3 reachable via ether2 distance=20 scope=40 target-scope=10 bgp-as-path="300,400"
bgp-weight=10 bgp-origin=incomplete received-from=peer2

1 Db dst-address=4.4.4.0/24 gateway=12.12.12.1 gateway-status=12.12.12.1 reachable via ether1 distance=20 scope=40 target-scope=10 bgp-as-path="100,400"
bgp-origin=incomplete received-from=peer1

Alhamdulillah postingan kali ini telah selesai, jika artikel ini terasa bermanfaat silahkan bisa di share dengan menekan salah satu button dibawah ini.

Wassalamu'alaikum ...

Share this :