def _bfd_tx(self, **kwargs):
        """Return the BFD minimum transmit interval XML.

        You should not use this method.
        You probably want `BGP.bfd`.

        Args:
            min_tx (str): BFD transmit interval in milliseconds (300, 500, etc)
            delete (bool): Remove the configuration if ``True``.

        Returns:
            XML to be passed to the switch.

        Raises:
            None
        """
        int_type = kwargs['int_type']
        method_name = 'interface_%s_bfd_interval_min_tx' % int_type
        bfd_tx = getattr(self._interface, method_name)
        config = bfd_tx(**kwargs)
        if kwargs['delete']:
            tag = 'min-tx'
            config.find('.//*%s' % tag).set('operation', 'delete')
        return config