Link-Aggregation in LAN with VLANs

Sounds like you have no other option for now.
Just out of curiosity, what's a LAGG (with two Gs)? :slight_smile: "Link AGgregation Group"?

Yes, unfortunately. ZyXEL GS1900-* use Realtek RTL838* too.

Link AGGregation is called LAGG in OPNsense, probably to make clear it's not about delay (lag).

OMG. The entire industry calls it since 30 years an LAG.