As much as I would trust the router os to separate and route traffic across ports. or perhaps you mean the switch. in which case I would probably spot check por

As much as I would trust the router os to separate and route traffic across ports. or perhaps you mean the switch. in which case I would probably spot check ports to make sure the switch firmware was not doing something weird, but in general yes, vlans are well specified and commonly used and I would mostly trust the switch vendor to handle them is the specified manner.