def _setup_buffer(self):
        '''
        Setup the buffer subsystem.
        '''
        if not self._buffer_cfg or not isinstance(self._buffer_cfg, dict):
            return
        buffer_name = list(self._buffer_cfg.keys())[0]
        buffer_class = napalm_logs.buffer.get_interface(buffer_name)
        log.debug('Setting up buffer interface "%s"', buffer_name)
        if 'expire_time' not in self._buffer_cfg[buffer_name]:
            self._buffer_cfg[buffer_name]['expire_time'] = CONFIG.BUFFER_EXPIRE_TIME
        self._buffer = buffer_class(**self._buffer_cfg[buffer_name])
Setup the buffer subsystem.