Difference between revisions of "Cisco: BGP 2 BGP redistribute 2 OSPF"

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Line 132: Line 132:
 
   router bgp 10
 
   router bgp 10
 
   bgp router-id 192.168.1.1
 
   bgp router-id 192.168.1.1
    ! address-family ipv4 unicast
 
 
     network 10.100.100.0 mask 255.255.255.0
 
     network 10.100.100.0 mask 255.255.255.0
 
     network 10.100.200.0 mask 255.255.255.0
 
     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 192.168.1.2 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
 
   end
 
ISP2:
 
 
 
enable
 
configure terminal
 
  router bgp 20
 
  bgp router-id 192.168.2.1
 
    ! address-family ipv4 unicast
 
    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
 
 
  
 
==Main / Backup Link Setup di ISP3==
 
==Main / Backup Link Setup di ISP3==

Revision as of 05:35, 28 December 2018

3BGP-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

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 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

ISP2

enable
configure terminal
  interface Ethernet1/0
    ip address 192.168.2.1 255.255.255.0
    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

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


R5

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
    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
  end

OSPF

ISP3

enable configure terminal

 !
 ! area 0 = backbone
 router ospf 3
 network 10.10.1.0 0.0.0.3 area 0.0.0.0
 network 10.10.1.4 0.0.0.3 area 0.0.0.0
 end


R4

enable
configure terminal
 !
 ! area 0 = backbone
 router ospf 4
 network 10.10.1.0 0.0.0.3 area 0.0.0.0
 network 10.10.1.4 0.0.0.3 area 0.0.0.0
 end


R5

enable
configure terminal
  !
  ! area 0 = backbone
  router ospf 5
  network 10.10.1.0 0.0.0.3 area 0.0.0.0
  network 10.10.1.4 0.0.0.3 area 0.0.0.0
  end

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