how to stack switch 5520 with VIM-4XE and 5420

[RobertoV]

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 cable? Which cable I have to order to stack together this 4 switch.
Thanks

[gfriedl · Accepted solution]

Currently there is no cable productized for stacking the 5420 and 5420 directly via Universal ports, so you instead need to use 10G stacking, which leads to the need for the VIM-4X - only this cann be used for stacking. VIM-4XE does not support stacking mode on it's ports (due to MACSEC PHY). Extreme Stacking tool shows you this capability: