Difference between revisions of "Mikrotik: BGP Sederhana"

Revision as of 05:25, 4 January 2019

Ada tiga (3) ISP

ISP1:

IP 192.168.1.1/24 menuju ISP3
IP 192.168.3.1/24 menuju ISP2
AS 10
IP 10.100.100.0/24
IP 10.100.200.0/24

ISP2

IP 192.168.2.1/24 - menuju ISP3
IP 192.168.3.2/24 - menuju ISP1
AS 20
IP 10.10.10.0/24
IP 10.10.20.0/24

ISP3 (kita)

IP 192.168.1.2/24 - menuju ISP1
IP 192.168.2.2/24 - menuju ISP2
AS 30
IP 10.1.1.0/24
IP 10.1.2.0/24

Setup connection

ISP1

/ip address add interface=ether1 address=192.168.1.1/24
/ip address add interface=ether2 address=192.168.3.1/24
/ip address add interface=ether3 address=10.100.100.1/24
/ip address add interface=ether4 address=10.100.200.1/24

ISP2

/ip address add interface=ether1 address=192.168.2.1/24
/ip address add interface=ether2 address=192.168.3.2/24
/ip address add interface=ether3 address=10.10.10.1/24
/ip address add interface=ether4 address=10.10.20.1/24

ISP3

/ip address add interface=ether1 address=192.168.1.2/24
/ip address add interface=ether2 address=192.168.2.2/24
/ip address add interface=ether3 address=10.1.1.1/24
/ip address add interface=ether4 address=10.1.2.1/24

BGP Peering

Consider that IP connectivity between ISPs edge routers and Our Core router is already set up and working properly. So we can start to establish BGP peering to both ISPs.

ISP1

#set our AS number
/routing bgp instance set default as=10
#add BGP peers
/routing bgp peer
add name=toISP3 remote-address=192.168.1.2 remote-as=30
add name=toISP2 remote-address=192.168.3.2 remote-as=20

ISP2

#set our AS number
/routing bgp instance set default as=20
#add BGP peers
/routing bgp peer
add name=toISP1 remote-address=192.168.3.1 remote-as=10
add name=toISP3 remote-address=192.168.2.2 remote-as=30

ISP3

#set our AS number
/routing bgp instance set default as=30
#add BGP peers
/routing bgp peer
add name=toISP1 remote-address=192.168.1.1 remote-as=10
add name=toISP2 remote-address=192.168.2.1 remote-as=20

Network Advertisements and Routing Filters

Start advertise our network & filter out all other unnecessary advertisement.

ISP1:

# advertise out network
/routing bgp network
add network=10.100.100.0/24 synchronize=no
add network=10.100.200.0/24 synchronize=no

ISP2:

# advertise out network
/routing bgp network
add network=10.10.10.0/24 synchronize=no
add network=10.10.20.0/24 synchronize=no

ISP3:

# advertise out network
/routing bgp network
add network=10.1.1.0/24 synchronize=no
add network=10.1.2.0/24 synchronize=no

Referensi

https://wiki.mikrotik.com/wiki/Manual:Simple_BGP_Multihoming

@@ Line 86: / Line 86: @@
   add network=10.100.100.0/24 synchronize=no
   add network=10.100.200.0/24 synchronize=no
- # routing filter
- /routing bgp peer
- set isp2 in-filter=isp2-in out-filter=isp2-out
- set isp3 in-filter=isp3-in out-filter=isp3-out
 ISP2:
@@ Line 98: / Line 93: @@
   add network=10.10.10.0/24 synchronize=no
   add network=10.10.20.0/24 synchronize=no
- # routing filter
- /routing bgp peer
- set isp1 in-filter=isp1-in out-filter=isp1-out
- set isp3 in-filter=isp3-in out-filter=isp3-out
 ISP3:
@@ Line 110: / Line 100: @@
   add network=10.1.1.0/24 synchronize=no
   add network=10.1.2.0/24 synchronize=no
- # routing filter
- /routing bgp peer
- set isp1 in-filter=isp1-in out-filter=isp1-out
- set isp2 in-filter=isp2-in out-filter=isp2-out
-Catatan:
-* in-filter untuk incoming (received) prefixes
-* out-filter untuk advertised prefixes.
-==Main/Backup link setup==
-===ISP3===
-Lakukan
-* accept network kita sendiri
-* drop semua tabel IP lainnya, karena kita tidak mau menjadi transit provider
-* BGP AS prepend - menaikan AS path
-Outgoing filter ke ISP1:
- /routing filter
- #accept our networks
- add chain=isp1-out prefix=10.1.1.0/24 action=accept
- add chain=isp1-out prefix=10.1.2.0/24 action=accept
- #discard the rest
- add chain=isp1-out action=discard
-Outgoing filter ke ISP2:
- /routing filter
- #accept our networks and prepend AS path three times
- add chain=isp2-out prefix=10.1.1.0/24 action=accept set-bgp-prepend=3
- add chain=isp2-out prefix=10.1.2.0/24 action=accept set-bgp-prepend=3
- #discard the rest
- add chain=isp2-out action=discard
-ISP1 menjadi main
-ISP2 menjadi backup
- /routing filter
- add chain=isp1-in action=discard
- add chain=isp2-in action=discard
- /ip route
- add gateway=192.168.1.1 check-gateway=ping
- add gateway=192.168.2.1 distance=30 check-gateway=ping
-==Load sharing setup==
-Teknik melakukan multihoming / download sharing
-[[File:Bgp-multihoming-download-sharing.png|center|400px|thumb]]
-===ISP3===
-Disini salah satu network kita di prepend yang berbeda antara ISP1 dan ISP2
-Outgoing filter ke ISP1:
- /routing filter
- #accept our networks and prepend second network
- add chain=isp1-out prefix=10.1.1.0/24 action=accept
- add chain=isp1-out prefix=10.1.2.0/24 action=accept  set-bgp-prepend=3
- #discard the rest
- add chain=isp1-out action=discard
-Outgoing filter ke ISP2:
- /routing filter
- #accept our networks and prepend first network
- add chain=isp2-out prefix=10.1.1.0/24 action=accept set-bgp-prepend=3
- add chain=isp2-out prefix=10.1.2.0/24 action=accept
- #discard the rest
- add chain=isp2-out action=discard
-Konfigurasi di atas hanya untuk outgoing packet dari network kita. Ada beberapa pilihan,
-* biarkan gateway menggunakan konfigurasi main/backup - ini akan menyebabkan hanya satu link yang digunakan dan routing akan asymetric.
-* gunakan policy routing untuk memaksa outgoing packet menggunakan link yang sama dengan dengan incoming
-* Menggnakan BGP untuk menerima full routing table dari ke dua peer dan menggunakan BGP attribute untuk melakukan routing melalui satu sambungan / link dan sebagian lagi melalui link lainnya. Contoh, traffic local / nasional bisa dikirim menggunakan ISP1 dan Internasional menggunakan ISP2.

Difference between revisions of "Mikrotik: BGP Sederhana"

Revision as of 05:25, 4 January 2019

Contents

Setup connection

BGP Peering

Network Advertisements and Routing Filters

Referensi

Pranala Menarik

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