The NSX-T host overlay VLAN must be configured on the adjacent top-of-rack switches connected to the VxRail nodes.
The NSX-T host overlay VLAN must be configured on the trunk ports connected to the VxRail nodes.
If NSX-T network traffic is to be configured on a VxRail system-generated virtual distributed switch with shared uplinks, then the NSX-T host overlay VLAN must be configure on all of the switch ports supporting that virtual distributed switch.
If a separate virtual distributed switch is to be deployed that is dedicated to NSX-T network traffic, then the NSX-T host overlay VLAN must be configured on those uplinks that are assigned to this virtual distributed switch.
Depending on where the Layer 2/ Layer 3 boundary is in the supporting physical network, pass the NSX-T host overlay VLAN upstream through the uplinks on the adjacent top-of-rack switches to the spine switch layer.
Gateway IP addresses must be assigned to the switches at the Layer 2/ Layer 3 boundary to enable routing.
If DHCP is used to supply the IP addresses, configuring ‘dhcp helper’ is recommended on the NSX-T host overlay VLAN, if this feature is supported on the switches.