Home > Integrated Products > VxRail > Guides > Architecture Guide—VMware Cloud Foundation on VxRail: VCF 4.5 on VxRail 7.0 > VxRail virtual distributed switch (system vDS)
The VxRail Appliance is the building block for each VxRail cluster, either Mgmt WLD or VI WLD. The VxRail virtual distributed switch (vDS) also known as the system vDS provides the virtual network layer for the system network services that are needed for the VCF solution. vDS can also provide the underlying networks for NSX-based WLDs if no additional vDS will be deployed. The virtual port groups on each vDS should be separated using a dedicated VLAN for best performance and security. The VxRail cluster bring-up process requires the following VLANs: