Extreme Networks

Is it possible to mix stacking method when I stack 2 switches 5520 (without VIM-4X) and 2 switches 5420 series switches using U1 and U2 port , using QSFT+ to QSFP+ cable between 5520 (SummitStack-V160) and special cable which converts QSFP+ to SFP-DD...

hi, I'd like to know which is the best method to stack 2 switch 5520 24p fiber with VIM-4XE installed and 2 switch 5420 48p. Is it possible to stack using SFP+ module installed in VIM-4XE module, or I should use stacking port U1 and U2 with proper ca...