As I know that the Balance 305/380 or above was not able to support port based VLAN/TRUNK assignment, but it do can support up to 128 VLAN, anyone know how to use those VLAN on Balance 305 or above router, since it will be a trouble when doing layer 2 pepvpn or use balance as a core of a Mid size company.
Port-based Vlan support for Balance 305 and above is on our roadmap. Anyway, all LAN ports of these model are in trunk mode once a tagged Vlan was created.
You may tie the SpeedFusion profile to Untagged Vlan in case you need to extend all Vlans from HQ to remote sites via Layer 2 SpeedFusion.
Hope this help.