The physical connections between the ports on your network switches and the NICs on the VxRail nodes enable communications for the virtual infrastructure within the VxRail cluster. The virtual infrastructure within the VxRail cluster uses the virtual distributed switch to enable communication within the cluster, and out to IT management and the application user community.
VxRail has predefined logical networks to manage and control traffic within the cluster and outside of the cluster. Certain VxRail logical networks must be made accessible to the outside community. For instance, connectivity to the VxRail management system is required by IT management. VxRail networks must be configured for end-users and application owners who need to access their applications and virtual machines running in the VxRail cluster. A network to support I/O to the vSAN datastore is required unless you plan to use Fibre Channel storage as the primary storage resource with a dynamic cluster. In addition, a network to support vMotion, which is used to dynamically migrate virtual machines between VxRail nodes to balance workload, must also be configured. Finally, an internal management network is required by VxRail for device discovery, and this network can be skipped if you plan to use manual device discovery.
All the Dell PowerEdge servers that serve as the foundation for VxRail nodes include a separate Ethernet port that enables out-of-band connectivity to the platform to perform hardware-based maintenance and troubleshooting tasks. A separate network to support management access to the Dell PowerEdge servers is recommended, but not required.