The vfiler rename command renames the vFiler unit. You can rename the vFiler unit when you want the vFiler unit to have a unique name. The command changes the name of the vFiler unit only within Data ONTAP.
The vfiler rename command does not re-broadcast the new name to the CIFS domain controllers or the NetBIOS name servers because these protocols might be using a different name for the vFiler unit from the name that Data ONTAP uses. To change the name mapping in the CIFS domain controllers, you should run CIFS setup for each of these protocols.