def METHOD_NAME(self, asn: int) -> Ibgp:
    """!
    @brief Mask an AS.
    By default, Ibgp layer will add iBGP peering for all ASes. Use this
    method to mask an AS and disable iBGP.
    @param asn AS to mask.
    @returns self, for chaining API calls.
    """
    self.__masked.add(asn)
    return self