Mikrotik: BGP 2 BGP redistribute 2 OSPF
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
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
R4
IP 10.1.1.2/24 menuju ISP3 IP 172.16.1.1 menuju R5 IP 172.16.10.1 LAN IP 172.16.20.1 LAN
R5
IP 10.1.2.2/24 menuju ISP3 IP 172.16.1.2 menuju R4 IP 172.16.100.1/24 LAN IP 172.16.200.1/24 LAN
Sambungan Fisik
ISP1
ISP1 e0 -> ISP3 e0 ISP1 e1 -> ISP2 e1 ISP2 e0 -> ISP3 e1
R3 e2 -> R4 e0 R3 e3 -> R5 e0 R4 e1 -> R5 e1
ISP1 e2 10.100.100.1/24 ISP1 e3 10.100.200.1/24 ISP2 e2 10.10.10.1/24 ISP2 e3 10.10.20.1/24 ISP3 e2 10.1.1.1/24 ISP3 e3 10.1.2.1/24
Setup connection
ISP1
/ip address add address=192.168.1.1/24 interface=ether1 /ip address add address=192.168.3.1/24 interface=ether2 /ip address add address=10.100.100.1/24 interface=ether3 /ip address add address=10.100.200.1/24 interface=ether4
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
R4
/ip address add interface=ether1 address=10.1.1.2/24 /ip address add interface=ether2 address=172.16.1.1/24 /ip address add interface=ether3 address=172.16.10.1/24 /ip address add interface=ether4 address=172.16.20.1/24
R5
/ip address add interface=ether1 address=10.1.2.2/24 /ip address add interface=ether2 address=172.16.1.2/24 /ip address add interface=ether3 address=172.16.100.1/24 /ip address add interface=ether4 address=172.16.200.1/24
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 # jika ingin redistribute default route ke client yang spesifik # add name=toISP2 remote-address=192.168.3.2 remote-as=20 default-originate=if-installed # add name=toISP3 remote-address=192.168.1.2 remote-as=30 default-originate=if-installed # # advertize routing # /routing bgp network add network=10.100.100.0/24 synchronize=no add network=10.100.200.0/24 synchronize=no
ISP3:
#set our AS number /routing bgp instance set default as=30 set redistribute-connected=yes numbers=default set redistribute-ospf=yes numbers=default #add BGP peers /routing bgp peer add name=toISP1 remote-address=192.168.1.1 remote-as=10 # # advertize network # /routing bgp network add network=10.1.1.0/24 synchronize=no add network=10.1.2.0/24 synchronize=no
OSPF
ISP3
# /routing ospf instance add name=default /routing ospf instance set name=default router-id=10.1.1.1 numbers=0 redistribute-bgp=yes /routing ospf instance enable numbers=0 /routing ospf network add network=10.1.1.0/24 area=backbone /routing ospf network add network=10.1.2.0/24 area=backbone
R4
# /routing ospf instance add name=default /routing ospf instance set name=default router-id=10.1.1.2 numbers=0 /routing ospf instance enable numbers=0 /routing ospf network add network=10.1.1.0/24 area=backbone /routing ospf network add network=172.16.1.0/24 area=backbone /routing ospf network add network=172.16.10.0/24 area=backbone /routing ospf network add network=172.16.20.0/24 area=backbone
R5
# /routing ospf instance add name=default /routing ospf instance set name=default router-id=10.1.2.2 numbers=0 /routing ospf instance enable numbers=0 /routing ospf network add network=10.1.2.0/24 area=backbone /routing ospf network add network=172.16.1.0/24 area=backbone /routing ospf network add network=172.16.100.0/24 area=backbone /routing ospf network add network=172.16.200.0/24 area=backbone
Cek
/routing filter print /routing bgp instance print /routing bgp peer print status /routing bgp peer print /routing bgp advertisements print /ip route print
Referensi
- https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_bgp/configuration/xe-16/irg-xe-16-book/configuring-a-basic-bgp-network.html
- https://wiki.mikrotik.com/wiki/Manual:Simple_BGP_Multihoming