AR750 native vlan

Hi,
When configured with tagged vlans the AR750 seems not to be able to have a ‘native’ vlan, one vlan with the tag stripped usually either VLAN0 or VLAN1. it does work on MT300 and B1300 though. any idea ?
thanks
Guillaume

I cannot think of a reason. AR750’s eth1 is also a switch and should be able to do the same.