Airbus Cross Bleed
My apologies in regard to your other question, as far as I am aware the Airbus does not have the air start function for its APU. Neither A-320 series or A330/340. Not quite sure for the -500/600 series. And why would you need the have air to start a shut down engine with additional air? The fact is even a windmilling engine may require supplimental air to get it up to a rotor speed to ensure a positive relight.