Difference between revisions of "Cisco: BGP 2 link ke 3 BGP redistribute 2 OSPF"

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[[File:3BGP-2OSPF.png|center|300px|thumb]]
 
[[File:3BGP-2OSPF.png|center|300px|thumb]]
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Ada tiga (3) ISP
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 +
ISP1:
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IP 192.168.1.1/24 menuju ISP3
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IP 192.168.3.1/24 menuju ISP2
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AS 10
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IP 10.100.100.0/24
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IP 10.100.200.0/24
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ISP2
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IP 192.168.2.1/24 - menuju ISP3
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IP 192.168.3.2/24 - menuju ISP1
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AS 20
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IP 10.10.10.0/24
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IP 10.10.20.0/24
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ISP3 (kita)
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IP 192.168.1.2/24 - menuju ISP1
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IP 192.168.2.2/24 - menuju ISP2
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AS 30
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IP 10.1.1.0/24
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IP 10.1.2.0/24
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==Sambungan Fisik==
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ISP1
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ISP1 Eth1/0 -> ISP3 Eth1/0
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ISP1 Eth1/1 -> ISP2 Eth1/1
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ISP2 Eth1/0 -> ISP3 Eth1/1
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ISP1 Eth1/2 10.100.100.1/24
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ISP1 Eth1/3 10.100.200.1/24
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ISP2 Eth1/2 10.10.10.1/24
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ISP2 Eth1/3 10.10.20.1/24
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ISP3 Eth1/2 10.1.1.1/24
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ISP3 Eth1/3 10.1.2.1/24
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==Setup connection==
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ISP1
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enable
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configure terminal
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  interface Ethernet1/0
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    ip address 192.168.1.1 255.255.255.0
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    no shutdown
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    exit
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  interface Ethernet1/1
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    ip address 192.168.3.1 255.255.255.0
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    no shutdown
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    exit
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  interface Ethernet1/2
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    ip address 10.100.100.1 255.255.255.0
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    no shutdown
 +
    exit
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  interface Ethernet1/3
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    ip address 10.100.200.1 255.255.255.0
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    no shutdown
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    exit
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  end
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ISP2
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enable
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configure terminal
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  interface Ethernet1/0
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    ip address 192.168.2.1 255.255.255.0
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    no shutdown
 +
    exit
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  interface Ethernet1/1
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    ip address 192.168.3.2 255.255.255.0
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    no shutdown
 +
    exit
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  interface Ethernet1/2
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    ip address 10.10.10.1 255.255.255.0
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    no shutdown
 +
    exit
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  interface Ethernet1/3
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    ip address 10.10.20.1 255.255.255.0
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    no shutdown
 +
    exit
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  end
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ISP3
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enable
 +
configure terminal
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  interface Ethernet1/0
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    ip address 192.168.1.2 255.255.255.0
 +
    no shutdown
 +
    exit
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  interface Ethernet1/1
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    ip address 192.168.2.2 255.255.255.0
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    no shutdown
 +
    exit
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  interface Ethernet1/2
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    ip address 10.1.1.1 255.255.255.0
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    no shutdown
 +
    exit
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  interface Ethernet1/3
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    ip address 10.1.2.1 255.255.255.0
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    no shutdown
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    exit
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  end
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==BGP Peering==
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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.
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ISP1:
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enable
 +
configure terminal
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  router bgp 10
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  bgp router-id 192.168.1.1
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    ! address-family ipv4 unicast
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    network 10.100.100.0 mask 255.255.255.0
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    network 10.100.200.0 mask 255.255.255.0
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    neighbor 192.168.3.2 remote-as 20
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    neighbor 192.168.1.2 remote-as 30
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    neighbor 192.168.3.2 activate
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    neighbor 192.168.1.2 activate
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    ! neighbor 192.168.3.2 default-originate
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    ! neighbor 192.168.1.2 default-originate
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  end
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ISP2:
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enable
 +
configure terminal
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  router bgp 20
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  bgp router-id 192.168.2.1
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    ! address-family ipv4 unicast
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    network 10.10.10.0 mask 255.255.255.0
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    network 10.10.20.0 mask 255.255.255.0
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    neighbor 192.168.3.1 remote-as 10
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    neighbor 192.168.2.2 remote-as 30
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    neighbor 192.168.3.1 activate
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    neighbor 192.168.2.2 activate
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  end
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==Main / Backup Link Setup di ISP3==
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Lakukan
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* accept network kita sendiri
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* drop semua tabel IP lainnya, karena kita tidak mau menjadi transit provider
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* BGP AS prepend - menaikan AS path ke salah satu ISP (disini ISP1)
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ISP3:
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enable
 +
configure terminal
 +
  router bgp 30
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  bgp router-id 192.168.1.2
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    ! address-family ipv4 unicast
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    network 10.1.1.0 mask 255.255.255.0
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    network 10.1.2.0 mask 255.255.255.0
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    neighbor 192.168.1.1 remote-as 10
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    neighbor 198.168.1.1 route-map PREPEND out
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    neighbor 192.168.2.1 remote-as 20
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    neighbor 192.168.1.1 activate
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    neighbor 192.168.2.1 activate
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    route-map PREPEND permit 10
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    set as-path prepend 30 30 30 30 30
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  end
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==Cek==
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! perhatikan AS 30 di tambahkan 5x ke routing ke arah AS 10
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!
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show ip bgp
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show ip route
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show ip bgp 10.100.1000.0/24
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show ip bgp neighbors 192.168.2.2 advertised-routes
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show ip bgp neighbor 192.168.1.1 routes
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show bgp ipv4 unicast neighbors
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show bgp ipv4 unicast summary
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==Referensi==
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* 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
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* https://wiki.mikrotik.com/wiki/Manual:Simple_BGP_Multihoming
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==Pranala Menarik==
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* [[Quagga]]
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* [[Mikrotik]]
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* [[Cisco]]
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* [[Juniper]]

Revision as of 20:08, 27 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

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
    ! address-family ipv4 unicast 
    network 10.100.100.0 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 192.168.3.2 activate 
    neighbor 192.168.1.2 activate 
    ! neighbor 192.168.3.2 default-originate 
    ! neighbor 192.168.1.2 default-originate
  end

ISP2: 


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

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

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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