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 Eth1/0 -> ISP3 Eth1/0
ISP1 Eth1/1 -> ISP2 Eth1/1
ISP2 Eth1/0 -> ISP3 Eth1/1

ISP1 Eth1/2 10.100.100.1/24
ISP1 Eth1/3 10.100.200.1/24

ISP2 Eth1/2 10.10.10.1/24
ISP2 Eth1/3 10.10.20.1/24

ISP3 Eth1/2 10.1.1.1/24
ISP3 Eth1/3 10.1.2.1/24


Setup connection

ISP1 

enable
configure terminal
  interface Ethernet1/0
    ip address 192.168.1.1 255.255.255.0
    no shutdown
    exit
  interface Ethernet1/1
    ip address 192.168.3.1 255.255.255.0
    no shutdown
    exit
  interface Ethernet1/2
    ip address 10.100.100.1 255.255.255.0
    no shutdown
    exit
  interface Ethernet1/3
    ip address 10.100.200.1 255.255.255.0
    no shutdown
    exit
 end

ISP3 

enable
configure terminal
  interface Ethernet1/0
    ip address 192.168.1.2 255.255.255.0
    no shutdown
    exit
  interface Ethernet1/1
    ip address 192.168.2.2 255.255.255.0
    no shutdown
    exit
  interface Ethernet1/2
    ip address 10.1.1.1 255.255.255.0
    no shutdown
    exit
  interface Ethernet1/3
    ip address 10.1.2.1 255.255.255.0
    no shutdown
    exit
 end


R4 

enable
configure terminal
  interface Ethernet1/0
    ip address 10.1.1.2 255.255.255.0
    no shutdown
    exit
  interface Ethernet1/1
    ip address 172.16.1.1 255.255.255.0
    no shutdown
    exit
  interface Ethernet1/2
    ip address 172.16.10.1 255.255.255.0
    no shutdown
    exit
  interface Ethernet1/3
    ip address 172.16.20.1 255.255.255.0
    no shutdown
    exit
 end


R5 

enable
configure terminal
  interface Ethernet1/0
    ip address 10.1.2.2 255.255.255.0
    no shutdown
    exit
  interface Ethernet1/1
    ip address 172.16.1.2 255.255.255.0
    no shutdown
    exit
  interface Ethernet1/2
    ip address 172.16.100.1 255.255.255.0
    no shutdown
    exit
  interface Ethernet1/3
    ip address 172.16.200.1 255.255.255.0
    no shutdown
    exit
 end

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: 

enable
configure terminal
  router bgp 10
  bgp router-id 192.168.1.1
    network 10.100.100.0 mask 255.255.255.0
    network 10.100.200.0 mask 255.255.255.0
    neighbor 192.168.1.2 remote-as 30
  end

Main / Backup Link Setup di ISP3

Lakukan

  • accept network kita sendiri
  • drop semua tabel IP lainnya, karena kita tidak mau menjadi transit provider
  • BGP AS prepend - menaikan AS path ke salah satu ISP (disini ISP1)


ISP3: 

enable
configure terminal
  router bgp 30
  bgp router-id 192.168.1.2
    no synchronization
    bgp log-neighbor-changes
    network 10.1.1.0 mask 255.255.255.0
    network 10.1.2.0 mask 255.255.255.0
    neighbor 192.168.1.1 remote-as 10
    redistribute ospf 3 metric 100 
  end

OSPF

ISP3 

enable
configure terminal
 !
 ! area 0 = backbone
 router ospf 3
 network 10.1.1.0 0.0.0.255 area 0.0.0.0
 network 10.1.2.0 0.0.0.255 area 0.0.0.0
 end


R4 

enable
configure terminal
 !
 ! area 0 = backbone
 router ospf 4
 network 10.1.1.0 0.0.0.255 area 0.0.0.0
 network 172.16.1.0 0.0.0.255 area 0.0.0.0
 network 172.16.10.0 0.0.0.255 area 0.0.0.0
 network 172.16.20.0 0.0.0.255 area 0.0.0.0
 end


R5 

enable
configure terminal
  !
  ! area 0 = backbone
  router ospf 5
  network 10.1.2.0 0.0.0.255 area 0.0.0.0
  network 172.16.1.0 0.0.0.255 area 0.0.0.0
  network 172.16.100.0 0.0.0.255 area 0.0.0.0
  network 172.16.200.0 0.0.0.255 area 0.0.0.0
  end

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

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