View source for Quagga: BGP 2 BGP redistribute 2 OSPF

[[File:2BGP-2OSPF.png|center|300px|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

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 Eth0 -> ISP3 Eth0
 ISP1 Eth1 -> ISP2 Eth1
 ISP2 Eth0 -> ISP3 Eth1
 
 ISP1 Eth2 10.100.100.1/24
 ISP1 Eth3 10.100.200.1/24
 
 ISP2 Eth2 10.10.10.1/24
 ISP2 Eth3 10.10.20.1/24
 
 ISP3 Eth2 10.1.1.1/24
 ISP3 Eth3 10.1.2.1/24
 
 R4 Eth1/0 -> ISP3 Eth1/2
 R5 Eth1/0 -> ISP3 Eth1/3
 R4 Eth1/1 -> R5 Eth1/1

==Setup connection==

ISP1

 vtysh
 configure terminal
   interface eth0
     ip address 192.168.1.1/24
     no shutdown
     exit
   interface eth1
     ip address 192.168.3.1/24
     no shutdown
     exit
   interface eth2
     ip address 10.100.100.1/24
     no shutdown
     exit
   interface eth3
     ip address 10.100.200.1/24
     no shutdown
     exit
  end

ISP3

 vtysh
 configure terminal
   interface eth0
     ip address 192.168.1.2/24
     no shutdown
     exit
   interface eth1
     ip address 192.168.2.2/24
     no shutdown
     exit
   interface eth2
     ip address 10.1.1.1/24
     no shutdown
     exit
   interface eth3
     ip address 10.1.2.1/24
     no shutdown
     exit
  end


R4

 vtysh
 configure terminal
   interface eth0
     ip address 10.1.1.2/24
     no shutdown
     exit
   interface eth1
     ip address 172.16.1.1/24
     no shutdown
     exit
   interface eth2
     ip address 172.16.10.1/24
     no shutdown
     exit
   interface eth3
     ip address 172.16.20.1/24
     no shutdown
     exit
  end


R5

 vtysh
 configure terminal
   interface eth0
     ip address 10.1.2.2/24
     no shutdown
     exit
   interface eth1
     ip address 172.16.1.2/24
     no shutdown
     exit
   interface eth2
     ip address 172.16.100.1/24
     no shutdown
     exit
   interface eth3
     ip address 172.16.200.1/24
     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:

 configure terminal
   router bgp 10
   bgp router-id 192.168.1.1
     network 10.100.100.0/24
     network 10.100.200.0/24
     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:

 configure terminal
   router bgp 30
   bgp router-id 192.168.1.2
     no synchronization
     bgp log-neighbor-changes
     network 10.1.1.0/24
     network 10.1.2.0/24
     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 10.1.1.0/24 area 0.0.0.0
  network 10.1.2.0/24 area 0.0.0.0
  end


R4

 enable
 configure terminal
  !
  ! area 0 = backbone
  router ospf 4
  network 10.1.1.0/24 area 0.0.0.0
  network 172.16.1.0/24 area 0.0.0.0
  network 172.16.10.0/24 area 0.0.0.0
  network 172.16.20.0/24 area 0.0.0.0
  end



R5

 enable
 configure terminal
   !
   ! area 0 = backbone
   router ospf 5
   network 10.1.2.0/24 area 0.0.0.0
   network 172.16.1.0/24 area 0.0.0.0
   network 172.16.100.0/24 area 0.0.0.0
   network 172.16.200.0/24 area 0.0.0.0
   end

==Cek==

 ! perhatikan AS 30 di tambahkan 5x ke routing ke arah AS 10
 !
 clear ip bgp 10
 clear ip bgp 20
 show ip bgp
 show ip route


 show ip route
 show ip bgp 10.100.1000.0/24
 show ip bgp neighbors 192.168.2.2 advertised-routes
 show ip bgp neighbor 192.168.1.1 routes
 show bgp ipv4 unicast neighbors 
 show bgp ipv4 unicast summary

==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




==Pranala Menarik==

* [[TCP/IP: Advanced Routing]]
* [[Quagga]]
* [[Mikrotik]]
* [[Cisco]]
* [[Juniper]]
* [[BIRD: Routing]]
* [[IPv6]]