is omitted, the commands are checked against the set of top
                    level or global commands.
        :param diff_replace: Instructs on the way to perform the configuration on the device.
                        If the replace argument is set to I(line) then the modified lines are
                        pushed to the device in configuration mode.  If the replace argument is
                        set to I(block) then the entire command block is pushed to the device in
                        configuration mode if any line is not correct.
        :return: Configuration and/or banner diff in json format.
               {
                   'config_diff': ''
               }

        NrC