I currently have two Fortigates Firewalls (Regions:West and East). Each of these Fortigates have BGP enabled GRE Tunnels to peered Transit gateways that work. Furthermore, I would like to bring down one Fortigate firewall and failover to the other (it does not matter which region fails over); moreover, my problem is that I would like for example: Fortigate west to not only connect to the GRE tunnel in West but also the GRE tunnel in EAST.
****Does transit gateway allow me to route or connect to another transit gateway GRE tunnel connector in another region. Currently for GRE we have to use subnets within 169.2540.0.0/16 based on AWS rules.
