Dual internet connection
We have Fortigate 50E with two ISPs
ISP1 <> WAN1 <> LAN1
ISP2 <> WAN2 <> LAN2
We have two subnets and each of them has dedicated ISP. Everything works propertly but I would like to extend this setup for full redundancy. For example if ISP1 is down ISP2 should deliver internet connection into LAN1 as well.
Is it possible to configure? How can I do it?