It would be great to be able to configure WAN on VLAN for the SDX/SDX Pro. It makes it much easier to get a WAN (often the secondary WAN) connected to two devices (ie Peplink’s in HA or a peplink & firewall).
I’m already doing this by adding a VLAN that only exists on the SD switch and connecting the WAN to it and manipulating the tagged/untagged settings on the ports. I use it with devices like the Balance 20X to interleave additional WAN’s using the new WAN over VLAN feature.
So I think the switch does what you need, it’s just not obvious how to set it up.
Sounds great, would you mind adding some screenshots?