Usage: Dfsutil /Server: /DfsDnsConfig: /Set This can be used to set the DfsDnsConfig registry value in a DC or Root Server ...

Usage:
Dfsutil /Server: /DfsDnsConfig: /Set 
This can be used to set the DfsDnsConfig registry value in a DC or Root Server
running OS Windows Server 2003 or above to the value provided.
The valid values can be 1 or 0

This could be used to display the value in a DC as well

dfsutil /Server: /DfsDnsConfig /Display