IPv4/IPv6 address or hostname of the external RADIUS server that is used for authentication. This parameter can be configured ...

IPv4/IPv6 address or hostname of the external RADIUS server that is used for authentication. This parameter can be configured only if the Type parameter is specified to be ExternalRadius.
If there are no pre-existing RADIUS servers configured for authentication (see cmdlet description for more details) then it is mandatory to specify a RADIUS server and its corresponding shared secret. Default values can be used for the other parameters. If one or more external RADIUS servers already exist from a previous configuration then they get re-used when External RADIUS authentication is chosen. If a new server is still specified in this cmdlet then it gets appended to this current list