Suppose you have a switch with many vlans configured and that there is not inter-vlan routing configured.
An access port on the switch is linked to a router.
I imagine that the vlan of this access port become necessarily the only vlan through with I can access the switch from outside the router.
I have set an ip address for every vlan configured on the switch.
At this point I should ping without problem an ip vlan on the switch from a pc belonging to the same vlan on the switch, and I should ping also the vlan attached to the router from outside the router.
In this case all ip vlan on the switch are working, even if the "inside" ip vlans are not very useful.
Why someone says that only an IP vlan can work at a time?
With boson netsim simulator they can work at the same time.