We currently use MTU 4200 because our initial Coraids were SR1520s. We have since purchased four SR1521s which I gather are capable of using MTU 9000? Is this the case? And is the 4200 limitation still in effect for the 1520s? We currently use aoe6.53.
 
If I am missing out on the MTU 9000 I will probably find a way to segregate the two models into two separate AoE networks so as not to "throttle" the newer devices unnecessarily.
 

John R. Gallivan
The MITRE Corporation
G036 Mission Oriented Information Technology
(781) 271-3040