BIRD: BGP Sederhana

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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

R1
e1 --> R3 e1
e2 --> R2 e2 
e3 --> LAN 10.100.100.0/24
e4 --> LAN 10.100.200.0/24
R2
e1 --> R3 e2
e2 --> R1 e2
e3 --> LAN 10.10.10.0/24
e4 --> LAN 10.10.20.0/24
R3
e1 --> R1 e1
e2 --> R2 e1
e3 --> LAN 10.1.1.0/24
e4 --> LAN 10.1.2.0/24


Setup connection

Pastikan semua ifconfig bersih, lakukan langkah BIRD: dari OpenWRT


ISP1

ifconfig eth1 192.168.1.1 netmask 255.255.255.0
ifconfig eth2 192.168.3.1 netmask 255.255.255.0
ifconfig eth3 10.100.100.1 netmask 255.255.255.0
ifconfig eth4 10.100.200.1 netmask 255.255.255.0


ISP2

ifconfig eth1 192.168.2.1 netmask 255.255.255.0
ifconfig eth2 192.168.3.2 netmask 255.255.255.0
ifconfig eth3 10.10.10.1 netmask 255.255.255.0
ifconfig eth4 10.10.20.1 netmask 255.255.255.0

ISP3

ifconfig eth1 192.168.1.2 netmask 255.255.255.0
ifconfig eth2 192.168.2.2 netmask 255.255.255.0
ifconfig eth3 10.1.1.1 netmask 255.255.255.0
ifconfig eth4 10.1.2.1 netmask 255.255.255.0

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

# vi /usr/local/etc/bird6.conf  # BIRD appliance di GNS3
vi /etc/bird.conf               # BIRD1 di OpenWRT

edit

log syslog all;
router id 192.168.1.1;
protocol kernel {                                                             
       learn;                  # Learn all alien routes from the kernel      
#      persist;                # Don't remove routes on bird shutdown        
       scan time 20;           # Scan kernel routing table every 20 seconds  
       import all;            # Default is import all                       
       export all;             # Default is export none                      
}
protocol device {                                                             
       scan time 10;           # Scan interfaces every 10 seconds            
}
protocol bgp {                                                               
       import all;
       export all;
       local as 10;                                                       
       neighbor 192.168.1.2 as 20;
}
protocol bgp {                                                               
       import all;
       export all;
       local as 10;                                                       
       neighbor 192.168.3.2 as 30;
}


# BIRD1 di OpenWRT
killall bird4
bird4

ISP2

set protocols bgp 20 parameters router-id 192.168.2.1
set protocols bgp 20 network 10.10.10.0/24
set protocols bgp 20 network 10.10.20.0/24
# set protocols bgp 20 neighbor 192.168.3.1 ebgp-multihop 2
set protocols bgp 20 neighbor 192.168.3.1 update-source 192.168.2.1
set protocols bgp 20 neighbor 192.168.3.1 remote-as 10
# set protocols bgp 20 neighbor 192.168.2.2 ebgp-multihop 2
set protocols bgp 20 neighbor 192.168.2.2 update-source 192.168.2.1
set protocols bgp 20 neighbor 192.168.2.2 remote-as 30
show
commit
exit

ISP3

set protocols bgp 30 parameters router-id 192.168.1.2
set protocols bgp 30 network 10.1.1.0/24
set protocols bgp 30 network 10.1.2.0/24
# set protocols bgp 30 neighbor 192.168.1.1 ebgp-multihop 2
set protocols bgp 30 neighbor 192.168.1.1 update-source 192.168.1.2
set protocols bgp 30 neighbor 192.168.1.1 remote-as 10
# set protocols bgp 30 neighbor 192.168.2.1 ebgp-multihop 2
set protocols bgp 30 neighbor 192.168.2.1 update-source 192.168.1.2
set protocols bgp 30 neighbor 192.168.2.1 remote-as 20
show
commit
exit

Test

show interfaces
show ip bgp scan 
show ip bgp summary
show ip bgp rsclient summary 
show ip bgp neighbors 192.168.1.2 
show ip route
show 


Referensi


Pranala Menarik