VxRail is most commonly deployed with two or four ports. For more network-intense workload requirements, VxRail can be deployed with six or eight network ports. This option supports spreading the VxRail networking between NDC/OCP ports and PCIe ports, and between ports on two different PCIe adapter cards. In this topology, resource-intense workloads such as vSAN and vMotion can each have a dedicated Ethernet port instead of shared Ethernet ports. This prevents the possibility of saturation of shared Ethernet port resources.
With the six-port option, you can use more of the PCIe ports as opposed to the NDC/OCP ports. If your nodes have two PCIe slots that are occupied with network adapter cards, this offers the flexibility to spread the VxRail networking workload across three network adapter cards.