def METHOD_NAME(self, indent: int) -> str:
    out = ' ' * indent
    out += 'IbgpLayer:\n'
    indent += 4
    out += ' ' * indent
    out += 'Masked ASes:\n'
    indent += 4
    for asn in self.__masked:
        out += ' ' * indent
        out += '{}\n'.format(asn)
    return out