Hello R.Sato, technically this is possible but not supported through Dell. You will end up with different hardware characteristics, table sizes and behaviors which can give unexpected results. Tim
Hello, Is this compatible with vlt cofiguration between s4048-on and s4148-on with os10? user guide wrote only following article.>• In a VLT domain, the peer network devices must run the same OS10 software version.  
Configure VLT mix model