The optional Linktype argument specifies the operational mode of
    the HDLC link, determining how the logical station operates. This
    value is negotiated with the remote station. This argument
    determines the value of the link type characteristic.

    balanced   The logical station operates in asynchronous response
               balanced mode. This is the default value of the
               argument.

    primary    The logical station is the primary and operates in
               normal response mode.

    secondary  The logical station is a secondary and operates in
               normal response mode.

    Example:

    create hdlc link hdlc-0 linktype primary