Flexible stacking is available on MS425 switches, which do not have dedicated stacking ports; any SFP+ interface on these switches can be configured as a stack port. You can use 2 x 10Gb/s (SFP+) or 2 x 40Gb/s (QSFP) interfaces can be connected together as flexible stacking ports. Have a look on the below document ad let me know if it answer your query ?
Flexible stacking is available on MS425 switches, which do not have dedicated stacking ports; any SFP+ interface on these switches can be configured as a stack port. You can use 2 x 10Gb/s (SFP+) or 2 x 40Gb/s (QSFP) interfaces can be connected together as flexible stacking ports. Have a look on the below document ad let me know if it answer your query ?