I have a FortiGate firewall in the main office and some branches with Cisco ASA. An IPsec tunnel runs between the main office and each branch. Some branches have two ISP - main and reserve. For example, building a tunnel between Cisco ASA with one public address and remote Cisco ASA with two public address is a simple task: we can set two remote peers in a crypto map for the device in main office. But we can not to do the same in FortiGate IPSec settings of Phase 2.
How can I solve this task?
Thank you in advance.