def METHOD_NAME(self) -> list:
    """
    Filtered ASNs
    """
    if self.shared_utils.underlay_filter_peer_as is False:
        return []
    # using set comprehension with `{}` to remove duplicates and then run natural_sort to convert to list.
    return natural_sort({link["peer_bgp_as"] for link in self._underlay_links if link["type"] == "underlay_p2p"})