To see the current VLAN and Port Status, you need to adjust the following:
Go to Settings -> NCM settings
in the section NCM Node Management go to Node Inventory Settings.
There you have to select Extend VLANs inventory which is disabled by default.
After you run the inventory job you'll see the VLAN assignment and the Port status.
But this works only for Cisco devices - or, to be more specific: for devices which respond to the CISCO-VLAN-MEMBERSHIP-MIB
I just had to learn this, because not all of our devices are Cisco.
Also keep in mind that these VLAN-IDs you get are only the ones which were collected during the last inventory job.