Difference between revisions of "Mikrotik: BGP Dua Link main backup - dengan as-path PREPEND"

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(Created page with "center|900px|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 10.100.20...")
 
Line 30: Line 30:
 
   
 
   
  
−
  ISP1 Eth1/0 -> ISP3 Eth1/0
+
  ISP1 eth0 -> ISP3 eth0
−
  ISP1 Eth1/1 -> ISP2 Eth1/1
+
  ISP1 eth1 -> ISP2 eth1
−
  ISP2 Eth1/0 -> ISP3 Eth1/1
+
  ISP2 eth0 -> ISP3 eth1
 
   
 
   
−
  ISP1 Eth1/2 10.100.100.1/24
+
  ISP1 eth2 10.100.100.1/24
−
  ISP1 Eth1/3 10.100.200.1/24
+
  ISP1 eth3 10.100.200.1/24
 
   
 
   
−
  ISP2 Eth1/2 10.10.10.1/24
+
  ISP2 eth2 10.10.10.1/24
−
  ISP2 Eth1/3 10.10.20.1/24
+
  ISP2 eth3 10.10.20.1/24
 
   
 
   
−
  ISP3 Eth1/2 10.1.1.1/24
+
  ISP3 eth2 10.1.1.1/24
−
  ISP3 Eth1/3 10.1.2.1/24
+
  ISP3 eth3 10.1.2.1/24
  
  
Line 49: Line 49:
 
ISP1
 
ISP1
  
−
  enable
+
  /ip address add interface=ether1 address=192.168.1.1/24
−
configure terminal
+
/ip address add interface=ether2 address=192.168.3.1/24
−
  interface Ethernet1/0
+
/ip address add interface=ether3 address=10.100.100.1/24
−
    ip address 192.168.1.1 255.255.255.0
+
/ip address add interface=ether3 address=10.100.200.1/24
−
    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
 
  
 
ISP2
 
ISP2
  
−
  enable
+
  /ip address add interface=ether1 address=192.168.2.1/24
−
configure terminal
+
/ip address add interface=ether2 address=192.168.3.2/24
−
  interface Ethernet1/0
+
/ip address add interface=ether3 address=10.10.10.1/24
−
    ip address 192.168.2.1 255.255.255.0
+
/ip address add interface=ether4 address=10.10.20.1/24
−
    no shutdown
 
−
    exit
 
−
  interface Ethernet1/1
 
−
    ip address 192.168.3.2 255.255.255.0
 
−
    no shutdown
 
−
    exit
 
−
  interface Ethernet1/2
 
−
    ip address 10.10.10.1 255.255.255.0
 
−
    no shutdown
 
−
    exit
 
−
  interface Ethernet1/3
 
−
    ip address 10.10.20.1 255.255.255.0
 
−
    no shutdown
 
−
    exit
 
−
  end
 
  
 
ISP3
 
ISP3
  
−
  enable
+
  /ip address add interface=ether1 address=192.168.1.2/24
−
configure terminal
+
/ip address add interface=ether2 address=192.168.2.2/24
−
  interface Ethernet1/0
+
/ip address add interface=ether3 address=10.1.1.1/24
−
    ip address 192.168.1.2 255.255.255.0
+
/ip address add interface=ether4 address=10.1.2.1/24
−
    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
 
  
 
==BGP Peering==
 
==BGP Peering==
Line 120: Line 76:
 
ISP1:
 
ISP1:
  
−
  enable
+
  #set our AS number
−
  configure terminal
+
  /routing bgp instance set default as=10
−
  router bgp 10
+
#add BGP peers
−
  bgp router-id 192.168.1.1
+
/routing bgp peer
−
    ! address-family ipv4 unicast
+
add name=toISP3 remote-address=192.168.1.2 remote-as=30
−
    network 10.100.100.0 mask 255.255.255.0
+
add name=toISP2 remote-address=192.168.3.2 remote-as=20
−
    network 10.100.200.0 mask 255.255.255.0
+
 
−
    neighbor 192.168.3.2 remote-as 20
 
−
    neighbor 192.168.1.2 remote-as 30
 
−
    neighbor 192.168.3.2 activate
 
−
    neighbor 192.168.1.2 activate
 
−
    ! neighbor 192.168.3.2 default-originate
 
−
    ! neighbor 192.168.1.2 default-originate
 
−
  end
 
  
 
ISP2:
 
ISP2:
  
−
 
+
#set our AS number
−
  enable
+
  /routing bgp instance set default as=20
−
  configure terminal
+
  #add BGP peers
−
  router bgp 20
+
/routing bgp peer
−
  bgp router-id 192.168.2.1
+
add name=toISP1 remote-address=192.168.3.1 remote-as=10
−
    ! address-family ipv4 unicast
+
add name=toISP3 remote-address=192.168.2.2 remote-as=30
−
    network 10.10.10.0 mask 255.255.255.0
 
−
    network 10.10.20.0 mask 255.255.255.0
 
−
    neighbor 192.168.3.1 remote-as 10
 
−
    neighbor 192.168.2.2 remote-as 30
 
−
    neighbor 192.168.3.1 activate
 
−
    neighbor 192.168.2.2 activate
 
−
  end
 
  
  
Line 177: Line 119:
 
     set as-path prepend 30 30 30 30 30
 
     set as-path prepend 30 30 30 30 30
 
   end
 
   end
 +
 +
 +
 +
 +
Lakukan
 +
* accept network kita sendiri
 +
* drop semua tabel IP lainnya, karena kita tidak mau menjadi transit provider
 +
* BGP AS prepend - menaikan AS path
 +
 +
Outgoing filter ke ISP1:
 +
 +
/routing filter
 +
#accept our networks
 +
add chain=isp1-out prefix=10.1.1.0/24 action=accept
 +
add chain=isp1-out prefix=10.1.2.0/24 action=accept
 +
#discard the rest
 +
add chain=isp1-out action=discard
 +
 +
Outgoing filter ke ISP2:
 +
 +
/routing filter
 +
#accept our networks and prepend AS path three times
 +
add chain=isp2-out prefix=10.1.1.0/24 action=accept set-bgp-prepend=3
 +
add chain=isp2-out prefix=10.1.2.0/24 action=accept set-bgp-prepend=3
 +
#discard the rest
 +
add chain=isp2-out action=discard
 +
 +
ISP1 menjadi main
 +
ISP2 menjadi backup
 +
 +
/routing filter
 +
add chain=isp1-in action=discard
 +
add chain=isp2-in action=discard
 +
 +
/ip route
 +
add gateway=192.168.1.1 check-gateway=ping
 +
add gateway=192.168.2.1 distance=30 check-gateway=ping
 +
 +
  
 
==Cek==
 
==Cek==

Revision as of 16:33, 1 January 2019

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 

/ip address add interface=ether1 address=192.168.1.1/24
/ip address add interface=ether2 address=192.168.3.1/24
/ip address add interface=ether3 address=10.100.100.1/24
/ip address add interface=ether3 address=10.100.200.1/24

ISP2 

/ip address add interface=ether1 address=192.168.2.1/24
/ip address add interface=ether2 address=192.168.3.2/24
/ip address add interface=ether3 address=10.10.10.1/24
/ip address add interface=ether4 address=10.10.20.1/24

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


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
add name=toISP2 remote-address=192.168.3.2 remote-as=20


ISP2: 

#set our AS number
/routing bgp instance set default as=20
#add BGP peers
/routing bgp peer
add name=toISP1 remote-address=192.168.3.1 remote-as=10
add name=toISP3 remote-address=192.168.2.2 remote-as=30


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
    ! address-family ipv4 unicast
    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
    neighbor 198.168.1.1 route-map PREPEND out
    neighbor 192.168.2.1 remote-as 20
    neighbor 192.168.1.1 activate
    neighbor 192.168.2.1 activate 
    route-map PREPEND permit 10
    set as-path prepend 30 30 30 30 30
  end



Lakukan

  • accept network kita sendiri
  • drop semua tabel IP lainnya, karena kita tidak mau menjadi transit provider
  • BGP AS prepend - menaikan AS path

Outgoing filter ke ISP1: 

/routing filter
#accept our networks
add chain=isp1-out prefix=10.1.1.0/24 action=accept
add chain=isp1-out prefix=10.1.2.0/24 action=accept
#discard the rest
add chain=isp1-out action=discard

Outgoing filter ke ISP2: 

/routing filter
#accept our networks and prepend AS path three times
add chain=isp2-out prefix=10.1.1.0/24 action=accept set-bgp-prepend=3
add chain=isp2-out prefix=10.1.2.0/24 action=accept set-bgp-prepend=3
#discard the rest
add chain=isp2-out action=discard

ISP1 menjadi main ISP2 menjadi backup 

/routing filter
add chain=isp1-in action=discard
add chain=isp2-in action=discard

/ip route
add gateway=192.168.1.1 check-gateway=ping
add gateway=192.168.2.1 distance=30 check-gateway=ping


Cek

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



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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