Konfigurasi Routing dengan BGP (Basic di Router MikroTik)

Contoh skenario yang akan digunakan adalah sebagai berikut :

R3 merupakan router yang menjalankan OSPF, sehingga R2 juga harus menjalankan OSPF. Antara R1 dan R2 akan menjalankan BGP karena kedua router tersebut berasal dari jaringan yang AS Number-nya berbeda. Konfigurasi yang perlu ditambahkan pada R2 adalah redistribute OSPF melalui BGP dan redistribute BGP melalui OSPF.

Konfigurasi BGP di R1 adalah sebagai berikut :

[admin@R1] > routing bgp instance print

Flags: X – disabled

 0   name=”default” as=65535 router-id=0.0.0.0 redistribute-connected=no redistribute-static=no redistribute-rip=no redistribute-ospf=no redistribute-other-bgp=no out-filter=”” client-to-client-reflection=yes ignore-as-path-len=no routing-table=””

 

[admin@R1] > routing bgp instance set 0 as=100 router-id=1.1.1.1

 

[admin@R1] > routing bgp instance print

Flags: X – disabled

 0   name=”default” as=100 router-id=1.1.1.1 redistribute-connected=no redistribute-static=no redistribute-rip=no redistribute-ospf=no redistribute-other-bgp=no

     out-filter=”” client-to-client-reflection=yes ignore-as-path-len=no routing-table=””

 

 

 

[admin@R1] > routing bgp peer add remote-as=200 remote-address=10.10.10.2

 

 

 

[admin@R1] > routing bgp network add network=192.168.10.0/24

[admin@R1] > routing bgp network add network=192.168.11.0/24

Konfigurasi BGP di R2 adalah sebagai berikut :

 [admin@R2] > routing bgp instance print

Flags: X – disabled

 0   name=”default” as=65535 router-id=0.0.0.0 redistribute-connected=no redistribute-static=no redistribute-rip=no redistribute-ospf=no redistribute-other-bgp=no out-filter=”” client-to-client-reflection=yes ignore-as-path-len=no routing-table=””

 

[admin@R1] > routing bgp instance set 0 as=200 router-id=2.2.2.2

 

[admin@R1] > routing bgp instance print

Flags: X – disabled

 0   name=”default” as=200 router-id=2.2.2.2 redistribute-connected=no redistribute-static=no redistribute-rip=no redistribute-ospf=no redistribute-other-bgp=no

     out-filter=”” client-to-client-reflection=yes ignore-as-path-len=no routing-table=””

 

 

 

[admin@R1] > routing bgp peer add remote-as=100 remote-address=10.10.10.1

 

 

 

[admin@R1] > routing bgp network add network=192.168.20.0/24

[admin@R1] > routing bgp network add network=192.168.30.0/24

[admin@R1] > routing bgp network add network=192.168.21.0/30

Yang perlu ditambahkan di pada R2 adalah redistribute antara OSPF dan BGP seperti berikut.

 [admin@R2] > routing bgp instance set 0 redistribute-ospf=yes

 

[admin@R2] > routing bgp instance print

Flags: X – disabled

 0   name=”default” as=200 router-id=2.2.2.2 redistribute-connected=no redistribute-static=no redistribute-rip=no redistribute-ospf=yes redistribute-other-bgp=no out-filter=”” client-to-client-reflection=yes ignore-as-path-len=no routing-table=””

 

 

 

[admin@R2] > routing ospf instance set 0 redistribute-bgp=as-type-1

 

[admin@R2] > routing ospf instance print

Flags: X – disabled

 0   name=”default” router-id=2.2.2.2 distribute-default=never redistribute-connected=no redistribute-static=no redistribute-rip=no redistribute-bgp=as-type-1 redistribute-other-ospf=no metric-default=1 metric-connected=20 metric-static=20 metric-rip=20 metric-bgp=auto metric-other-ospf=auto in-filter=ospf-in out-filter=ospf-out

Sehingga tabel routing dari ketiga router adalah sebagai berikut :

 [admin@R1] > ip route print

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

 #      DST-ADDRESS        PREF-SRC        GATEWAY            DISTANCE

 0 ADC  10.10.10.0/30      10.10.10.1      ether1             0      

 1 ADC  192.168.10.0/24    192.168.10.1    ether2             0      

 2 ADC  192.168.11.0/24    192.168.11.1    ether3             0      

 3 ADb  192.168.20.0/24                    10.10.10.2         20     

 4 ADb  192.168.21.0/30                    10.10.10.2         20     

 5 ADb  192.168.30.0/24                    10.10.10.2         20  

 

 

[admin@R2] > ip route print

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

 #      DST-ADDRESS        PREF-SRC        GATEWAY            DISTANCE

 0 ADC  10.10.10.0/30      10.10.10.2      ether1             0      

 1 ADb  192.168.10.0/24                    10.10.10.1         20     

 2 ADb  192.168.11.0/24                    10.10.10.1         20     

 3 ADo  192.168.20.0/24                    192.168.21.1       110    

 4 ADC  192.168.21.0/30    192.168.21.2    ether2             0      

 5 ADo  192.168.30.0/24                    192.168.21.1       110   

 

 

[admin@R3] > ip route print

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

 #      DST-ADDRESS        PREF-SRC        GATEWAY            DISTANCE

 0 ADo  10.10.10.0/30                      192.168.21.2       110    

 1 ADo  192.168.10.0/24                    192.168.21.2       110    

 2 ADo  192.168.11.0/24                    192.168.21.2       110    

 3 ADC  192.168.20.0/24    192.168.20.0    ether2             0      

 4 ADC  192.168.21.0/30    192.168.21.1    ether1             0      

 5 ADC  192.168.30.0/24    192.168.30.1    ether3             0   

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