Mikrotik: BGP 2 BGP redistribute 2 OSPF

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2BGP-2OSPF.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

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=as-type-1
/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

Pranala Menarik