def add(self, elem, replace=False):
        """Add a requirement.

        :param elem: a string or :class:`Requirement` instance.
        :param replace: if `True`, packages in the set with the same name will
            be removed first.
        """
        if isinstance(elem, text_type):
            elem = Requirement.coerce(elem)
        if replace and elem in self:
            self.remove(elem)
        super(Requirements, self).add(elem)
def get_vpp_config(self):
        is_ipv6 = True if self._nh_addr.version == 6 else False
        return self._test.vapi.ip_punt_redirect_dump(
            sw_if_index=self._rx_index, is_ipv6=is_ipv6)