def load_replace_candidate(self, filename=None, config=None):
self.config_replace = True<EOL>return_status, msg = self._load_candidate_wrapper(source_file=filename,<EOL>source_config=config,<EOL>dest_file=self.candidate_cfg,<EOL>file_system=self.dest_file_system)<EOL>if not return_status:<EOL><INDENT>raise ReplaceConfigException(msg)<EOL><DEDENT>
SCP file to device filesystem, defaults to candidate_config.

Return None or raise exception