Fortigate SDWAN

 1. Configure WAN interface IP addresses, remove all other interface related configurations,  ref should shows "0".

2. There is a default SDWAN zone called "virtual-wan-link" (older version called SD-WAN interface), navigate to Network > SD-WAN Zones , Create New > SDWAN Member

Verification:

Network > SD-WAN Zones

Verification:

Network > Interfaces

2. (optional) SDWAN load balancing mode

SD-WAN Implicit Rules

3. Set default route using SD-WAN interface.

4. Add firewall policy

5. Verify routing:

Local-FortiGate # get router info routing-table all

...

Routing table for VRF=0

S*      0.0.0.0/0 [1/0] via 10.200.1.254, port1

                  [1/0] via 10.200.2.254, port2

C       10.0.1.0/24 is directly connected, port3

Dashboard > Network > Routing

6. Create SD-WAN rules

     Manual

     Manually assign outgoing interfaces.

Best Quality

The interface with the best measured performance is selected.

Lowest Cost (SLA)

The interface that meets SLA targets is selected. When there is a tie, the interface with the lowest assigned cost is selected.

Maximize Bandwidth (SLA)

Traffic is load balanced among interfaces that meet SLA targets.

   Also need set Interface Preference. 

7. Performance SLA

Create or pickup a pre-defined SLA, assign it SD-WAN members

Set target server and the protocol used to probe the server

For Lowest Cost and Maximize Bandwidth SD-WAN rules, SLA Target is required.