Your config won't help me though. As long as the switch on the ERPoe-5 doesn't actually support vlans (it supports virtual interfaces, but tagged/untagged/trunk isn't possible), I have to find some other hardware that does.
The EdgeOS user guide states the following, without model reservations:
VLAN Aware Starting with EdgeOS v1.8.5, the per-port VLAN feature is available. If this option is enabled, then untagged and tagged VLANS can be set for each port in switch mode. If this option is kept disabled (default), then the switch ports will pass all VLANs automatically (simple layer-2 switching with no per-port VLAN).
But that is unfortunately not true at all. The switch in the ERPoe is not VLAN aware.