Basically I am trying to connect one trunk port (tagged VLAN) of a manged switch with the router.

The I am trying to access the separate VLANs eg id 11 with “eth0.11” but this seams not to work.

If this will work I can use the “small” MT300A to route more than two physically interfaces.

Maybe the link is not the best (maybe the picture at the top of this page help http://cyberscribe.org/intervlan-routing/).