If you are familiar with ECMP, you probably know the v4-ecmp-mode setting available under config system settings. The v4-ecmp-mode setting defines the algorithm that FortiGate uses to load balance sessions that match ECMP routes in the VDOM.
However, when you enable SD-WAN on FortiGate, FortiOS hides the v4-ecmp-mode setting and replaces it with the load-balance-mode setting under config system sdwan. That is, after you enable SD-WAN, you now control the VDOM ECMP algorithm with the load-balance-mode setting.
Both v4-ecmp-mode & load-balance-mode control the VDOM ECMP algorithm, but Load-balance-mode replaces v4-ecmp-mode when SD-WAN is enabled. page 179 7.2 study guide. sdwan_mbr_seq and sdwan_service_id indicate the SD-WAN member & SD-WAN rule ID. If the session matched the SD-WAN implicit rule, therefore handled using the standard FIB routing, these SD-WAN fields do not appear. 7.2 study guide page 149
A,C are correct
sdwan_service_id is 0 = match SD-WAN implicit rule, study guide 7.0 page 120, 7.2 page 149
SD-WAN rules internally are interpreted as a Policy route, so when the traffic doesn't match with any policy route, it will be flowing by implict policy.
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