I have two Fortigate 500E's in separate locations (primary site and failover site) that connect to each other via ISP link. I have 7 branch locations that connect to both sites (primary and failover) via the same link. Each 500E has it's own independent Internet connection and I would like to create a failover connection, so if the primary site goes down, all branch gates route to the failover site instead. Because they are all connected via the same link, I only have one WAN port. I set each WAN port to have a secondary address which matches the failover site LAN. I am looking for suggestions on how to configure the branch gates to automatically re-route to the failover site if connection to the primary site is lost.
Primary gate: Primary IP 10.0.0.1 / Secondary IP 18.104.22.168
Failover gate: 22.214.171.124
Branch A WAN 1: Primary IP 10.0.0.4 / Secondary IP 126.96.36.199
Branch B WAN 1: Primary IP 10.0.0.5 / Secondary IP 188.8.131.52
Branch C WAN 1: Primary IP 10.0.0.6 / Secondary IP 184.108.40.206
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