I've been bashing my head against the wall all day for a definitive answer on this: On a Cisco switch that supports QinQ (3550, 3750, ME3400, 3560 etc) What is the _minimum_ value I need to set the system MTU to, to do QinQ? 1504? 1522? 1526? 1546? I can't seem to find one concise answer... Thanks!!