FortiGate BGP Load-Balancing (ECMP)

 Problem

In this scenario you have two ISP connections and learn routes over BGP. You would like to use both ISP connection and would like to configure load-balancing over both ISP-connections.


Solution

That's an easy thing. :) Enable ebgp-multipath option in the BGP configuration part.

config router bgp
    set ebgp-multipath enable
end
If you would like to do the same in iBGP, than use ibgp-multipath

Verify

Before enable multipath

get router info routing-table all
Codes: K - kernel, C - connected, S - static, R - RIP, B - BGP
       O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area
       * - candidate default

Routing table for VRF=0
B*      0.0.0.0/0 [20/0] via 10.10.10.254, port4, 00:00:45
C       10.10.10.248/29 is directly connected, port4
C       10.10.60.248/29 is directly connected, port5

After enable multipath

get router info routing-table all
Codes: K - kernel, C - connected, S - static, R - RIP, B - BGP
       O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area
       * - candidate default

Routing table for VRF=0
B*      0.0.0.0/0 [20/0] via 10.10.10.254, port4, 00:00:28
                  [20/0] via 10.10.60.254, port5, 00:00:28
C       10.10.10.248/29 is directly connected, port4
C       10.10.60.248/29 is directly connected, port5

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