Border Gateway Protocol (BGP)

To configure the FortiGate interfaces – CLI

config system interface edit port1

set alias internal

set ip 10.11.101.110 255.255.255.0 set allowaccess http https ssh

set description “Company internal network”

set status up next

edit port2

set alias external1

set ip 172.21.111.5 255.255.255.0 set allowaccess https ssh

set description “ISP1 External BGP network”

set status up next

edit port3

set alias external2

set ip 172.22.222.5 255.255.255.0 set allowaccess https ssh

set description “ISP2 External BGP network”

set status up next

end

 

To configure default routes for both ISPs – web-based manager

1. Go to Router > Static > Static Routes.

2. Delete any existing routes with a IP/Mask of address of 0.0.0.0/0.0.0.0

3. Select Create New, and set the following information.

Destination IP/Mask                 0.0.0.0/0.0.0.0

Device                                         port2

Gateway                                     172.21.111.5

Distance                                     10

4. Select OK.

5. Select Create New, and set the following information.

Destination IP/Mask                 0.0.0.0/0.0.0.0

Device                                         port3

Gateway                                     172.22.222.5

Distance                                     15

6. Select OK.


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6 thoughts on “Border Gateway Protocol (BGP)

  1. Hi Mike,
    if i configure the following on fortigate1:
    config router bgp
    set as 65000
    set router-id 10.2.2.254
    config neighbor
    edit “10.2.2.253”
    set next-hop-self enable
    set remote-as 65000
    set send-community6 disable
    next

    config redistribute “static”
    set status enable
    end

    fortigate2 should get the default route 0.0.0.0 0.0.0.0 from fortigate1 as it is static ?

    how can i redistribute the default route(fortigate1) to fortigate2 ?

    thanks
    regards

    • There is a really good KB article that explains how to do this. You can find it here

      If you want to redistribute static routes you would enable the following

      config router bgp
      config redistribute static
      set status enable
      end
      end

      An example of the config would be like this

      config router prefix-list
      edit “only_dflt”
      config rule
      edit 1
      set prefix 0.0.0.0 0.0.0.0
      unset ge
      unset le
      next
      end
      next
      end

      config router route-map
      edit “only_default_route”
      config rule
      edit 1
      set match-ip-address “only_dflt”
      next
      end
      next
      end

      config router bgp
      set as 2
      config neighbor
      edit 10.142.0.110
      set remote-as 1
      set route-map-in “only_default_route”
      next
      end

      set router-id 10.142.0.205
      end

      Let me know if this helped answer your question!

      Thanks!

  2. config router bgp
    set as 65041
    set router-id 162.53.156.138
    config neighbor
    edit “10.104.55.1”
    set ebgp-enforce-multihop enable
    set soft-reconfiguration enable
    set remote-as 64699
    set send-community6 disable
    next
    edit “10.104.55.2”
    set ebgp-enforce-multihop enable
    set soft-reconfiguration enable
    set remote-as 64699
    set send-community6 disable
    next

    i am trying to accomplish above but i can see only one neighbour is establish and other is in ACTIVE state…

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