Public IP failover to secondary fortigate

Hi @jpever ,

Fortigate on HA (A-P and A-A) will be having same configuration.

Thus, the IP address configured on FW1 will be the same with FW2.
IP addresses will be active on Primary Firewall.
If primary firewall fails, the secondary device will take over all the IP addresses and connection.

https://docs.fortinet.com/document/fortigate/7.4.3/administration-guide/900885/ha-active-passive-cluster-setup

In other words, one FGT needs to terminate both circuits and have a mechanism to failover the circuit by itself. The mechanism can be SD-WAN setup or simple metric based failover (AD or priority) with link-monitor, or BGP if both circuit vendors (or one vendor) offer BGP. But the topology concept looks like below:
  https://docs.fortinet.com/document/fortigate/6.0.0/cookbook/759633/sd-wan-with-fgcp-ha-expert
The switches terminating the circuits can be only one, just like LAN side in the diagram. The key is to split the circuits and deliver them to both units.

Toshi