During VxRail 4.7 deployment, the user is prompted for the Management Network VLAN ID in the UI. This references the External Management VLAN, which is VLAN 1811 in this guide. Since ports in this VLAN are access ports (untagged), leave the value set to 0, as shown in the figure below.
Use the actual VLAN numbers for the remaining VLANs when prompted by the deployment UI. Ports in the remaining VLANs are tagged.