 VxRail SFP+ connections can be made via Twinax or optical cables. Twinax Direct-Attach-Copper (DAC) cables are ToR switch dependent. Alos, the SFP+ optics are Appliance NIC and Switch dependent. For the VxRail side, compatible optics can be optinally ordered from EMC (model number “SIO-NETCONNECT-003”)   
Hi, Could you please advise me the reason why EMC does not provide Optical SFP module(transceivers) with VxRail?
Optical SFP module for VxRail