Are SDWAN interfaces Active-active or active-passive?

[BusinessUser]

Since I have 2 WAN interfaces in a virtual-wan-link.

For the traffic is it Active-active or active-passive?

Is there any way to change the priority?

[pminarik · Accepted solution]

I don't think I've seen A-A vs A-P terminology used much when discussing SD-WAN members/links, but anyway: SD-WAN is built on top of ECMP routes, which means that all participating SD-WAN members must have routes towards relevant destinations in the routing table, i.e. "be active".

Moreover, the default load-balacing (without any specific rules) is per-source-IP across all members. So again, this is very much "active-active".

There's many was of setting one or more interfaces to be preferred, including manual prioritization. Have a read though the documentation: 

https://docs.fortinet.com/sdwan

https://docs.fortinet.com/document/fortigate/7.2.5/administration-guide/889544/sd-wan-quick-start