Parses the config block and returns the configured IP MTU value

        The provided configuration block is scanned and the configured value
        for the IP MTU is returned as a dict object.  The IP MTU value is
        expected to always be present in the provided config block

        Args:
            config (str): The interface configuration block to parse

        Return:
            dict: A dict object intended to be merged into the resource dict

def _parse_mtu(self, config):
        """Parses the config block and returns the configured IP MTU value

        The provided configuration block is scanned and the configured value
        for the IP MTU is returned as a dict object.  The IP MTU value is
        expected to always be present in the provided config block

        Args:
            config (str): The interface configuration block to parse

        Return:
            dict: A dict object intended to be merged into the resource dict
        """
        match = re.search(r'mtu (\d+)', config)
        return dict(mtu=int(match.group(1)))