_parse_rd scans the provided configuration block and extracts
        the vrf rd. The return dict is intended to be merged into the response
        dict.

        Args:
            config (str): The vrf configuration block from the nodes running
                configuration

        Returns:
            dict: resource dict attribute

def _parse_rd(self, config):
        """ _parse_rd scans the provided configuration block and extracts
        the vrf rd. The return dict is intended to be merged into the response
        dict.

        Args:
            config (str): The vrf configuration block from the nodes running
                configuration

        Returns:
            dict: resource dict attribute
        """
        match = RD_RE.search(config)
        if match:
            value = match.group('value')
        else:
            value = match
        return dict(rd=value)