Difference between revisions of "Mikrotik: BGP Sederhana"

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Line 1: Line 1:
 
[[File:Bgp-multihoming.png|center|400px|thumb]]
 
[[File:Bgp-multihoming.png|center|400px|thumb]]
 +
 +
Sambungan
 +
 +
ISP1:
 +
eth0  --> ISP3 eth0
 +
eth1  --> ISP2 eth1
 +
 +
ISP2
 +
eth0  --> ISP3 eth1
 +
eth1  --> ISP1 eth1
 +
 +
ISP3
 +
eth0  --> ISP1 eth0
 +
eth1  --> ISP2 eth0
 +
 +
  
  
Line 201: Line 217:
 
* https://wiki.mikrotik.com/wiki/Manual:Simple_BGP_Multihoming
 
* https://wiki.mikrotik.com/wiki/Manual:Simple_BGP_Multihoming
  
 +
 +
[[File:Bgp-multihoming.png|center|400px|thumb]]
 +
 +
 +
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
 +
 +
# 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:
 +
 +
# advertise out network
 +
/routing bgp network
 +
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:
 +
 +
# advertise out network
 +
/routing bgp network
 +
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.
 +
 +
 +
 +
==Referensi==
 +
 +
* https://wiki.mikrotik.com/wiki/Manual:Simple_BGP_Multihoming
 +
 +
 +
[[File:Bgp-multihoming.png|center|400px|thumb]]
 +
 +
 +
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
 +
 +
# 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:
 +
 +
# advertise out network
 +
/routing bgp network
 +
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:
 +
 +
# advertise out network
 +
/routing bgp network
 +
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.
 +
 +
 +
 +
==Referensi==
 +
 +
* https://wiki.mikrotik.com/wiki/Manual:Simple_BGP_Multihoming
  
 
==Pranala Menarik==
 
==Pranala Menarik==
Line 210: Line 631:
 
* [[Cisco]]
 
* [[Cisco]]
 
* [[Juniper]]
 
* [[Juniper]]
−
* [[BIRD: Routing]]
+
* [[BIRD1]]
 +
* [[BIRD2]]
 
* [[IPv6]]
 
* [[IPv6]]
  
Line 217: Line 639:
 
* [[IPv6: Advanced Routing]]
 
* [[IPv6: Advanced Routing]]
 
* [[IPv6: Quagga]]
 
* [[IPv6: Quagga]]
 +
* [[IPv6: VyOS]]
 
* [[IPv6: Mikrotik]]
 
* [[IPv6: Mikrotik]]
 
* [[IPv6: Cisco]]
 
* [[IPv6: Cisco]]
 
* [[IPv6: Juniper]]
 
* [[IPv6: Juniper]]
−
* [[IPv6: BIRD: Routing]]
+
* [[IPv6: BIRD1]]
 +
* [[IPv6: BIRD2]]
 
* [[IPv6]]
 
* [[IPv6]]

Latest revision as of 09:33, 14 December 2021

Bgp-multihoming.png

Sambungan 

ISP1:
eth0  --> ISP3 eth0
eth1  --> ISP2 eth1

ISP2
eth0  --> ISP3 eth1
eth1  --> ISP1 eth1

ISP3
eth0  --> ISP1 eth0
eth1  --> ISP2 eth0



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

# 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: 

# advertise out network
/routing bgp network
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: 

# advertise out network
/routing bgp network
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

Bgp-multihoming-download-sharing.png

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.


Referensi


Bgp-multihoming.png


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

# 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: 

# advertise out network
/routing bgp network
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: 

# advertise out network
/routing bgp network
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

Bgp-multihoming-download-sharing.png

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.


Referensi


Bgp-multihoming.png


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

# 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: 

# advertise out network
/routing bgp network
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: 

# advertise out network
/routing bgp network
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

Bgp-multihoming-download-sharing.png

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.


Referensi

Pranala Menarik


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