Mikrotik: BGP Dua Link main backup - dengan access list dan routemap

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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


Sambungan Fisik

ISP1 


ISP1 ether0 -> ISP3 ether0
ISP1 ether1 -> ISP2 ether1
ISP2 ether0 -> ISP3 ether1

ISP1 ether2 10.100.100.1/24
ISP1 ether3 10.100.200.1/24

ISP2 ether2 10.10.10.1/24
ISP2 ether3 10.10.20.1/24

ISP3 ether2 10.1.1.1/24
ISP3 ether3 10.1.2.1/24


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=ether3 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


Equivalen routemap dan access list

Di Mikrotik tidak ada routemap dan access list, tapi kita bisa mengakali dengan

ISP3: 

#set our AS number
/routing bgp instance set default as=30
#add BGP peers
/routing bgp peer
add remote-address=192.168.1.1 remote-as=10
add remote-address=192.168.2.1 remote-as=20
#
/routing bgp network
add network=10.1.1.0/24 synchronize=no
add network=10.1.2.0/24 synchronize=no

# pengganti routemap & access list
# 
/ip firewall address-list add list=boleh-out address=10.1.1.0/24
/ip firewall address-list add list=boleh-out address=10.1.2.0/24
/ip firewall filter add chain=forward action=drop out-interface=ether1 src-address-list=!boleh-out
/ip firewall filter add chain=forward action=drop out-interface=ether2 src-address-list=!boleh-out

Cek

/routing bgp peer print status 
/routing filter print
/routing bgp instance print
/routing bgp peer print status
/routing bgp peer print
/routing bgp advertisements print 
/ip route print


Referensi

Pranala Menarik

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