How to use BGP and SD-WAN for advertising routes and path selection in FortiGate

https://kb.fortinet.com/kb/documentLink.do?popup=true&externalID=FD41389&languageId=

Technical Note: How to setup redundant point-to-point IPSec VPN using multi-home BGP links

http://kb.fortinet.com/kb/microsites/search.do?cmd=displayKC&docType=kc&externalId=FD35166&sliceId=1&docTypeID=DT_KCARTICLE_1_1&dialogID=27692425&stateId=1%200%2027690965