@mk24
Thank you! I've done some testing and it seems that I managed to get the upstream modem - connected to the router's WAN port - to handle the VLAN tagging.
Should we file a bug report on this issue or is this being handled by someone? I had no idea support for this device isn't complete yet.
My PPPoE still keeps disconnecting. I've done some more digging and it appears to be a common issue. I'm currently testing out the "option keepalive" fix and will report if my interface uptime is fixed. Not sure if OP is trying to set up his ISP connection or if he needs VLANs for something else?