NSX-T depend on extending the standard Ethernet frame beyond the default 1500 bytes to support the tunneling of virtual machine traffic over the physical network in Cloud Foundation on VxRail. NSX-T depends on the GENEVE (GEneric NEtwork Virtualization) standard, which requires an MTU size of 1600 or higher to support the encapsulation of virtual machine traffic and provide the additional required header space. The physical network supporting Cloud Foundation on VxRail must support the ability to increase the MTU size to support tunneling.
Figure 15. NSX-T extended frames