Quagga: BGP Sederhana - dengan MD5 Authentication

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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 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


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

ISP2 

vtysh
configure terminal
  interface eth0
    ip address 192.168.2.1/24
    no shutdown
    exit
  interface eth1
    ip address 192.168.3.2/24
    no shutdown
    exit
  interface eth2
    ip address 10.10.10.1/24
    no shutdown
    exit
  interface eth3
    ip address 10.10.20.1/24
    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

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: 

vtysh
configure terminal
  router bgp 10
  bgp router-id 192.168.1.1
    no synchronization
    bgp log-neighbor-changes
    ! address-family ipv4 unicast 
    network 10.100.100.0/24
    network 10.100.200.0/24
    neighbor 192.168.3.2 remote-as 20
    neighbor 192.168.1.2 remote-as 30
    neighbor 192.168.3.2 password $AP7i1
    neighbor 192.168.1.2 password $AP7i1
  end

ISP2: 


vtysh
configure terminal
  router bgp 20
  bgp router-id 192.168.2.1
    no synchronization
    bgp log-neighbor-changes
    network 10.10.10.0/24
    network 10.10.20.0/24
    neighbor 192.168.3.1 remote-as 10
    neighbor 192.168.2.2 remote-as 30
    neighbor 192.168.3.1 password $AP7i1
    neighbor 192.168.2.2 password $AP7i1
  end

ISP3: 

enable
configure terminal
  router bgp 30
  bgp router-id 192.168.1.2
    no synchronization
    bgp log-neighbor-changes
    network 10.1.1.0/24
    network 10.1.2.0/24
    neighbor 192.168.1.1 remote-as 10
    neighbor 192.168.2.1 remote-as 20
    neighbor 192.168.1.1 password $AP7i1
    neighbor 192.168.2.1 password $AP7i1
  end

Cek

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

Pranala Menarik

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