MLDV2_QUERY_QRV
if (bp[MLDV2_QUERY_QRV] & MLDV2_QUERY_QRV_SFLAG) {
if (MLD_QRV(bp[MLDV2_QUERY_QRV])) {
printf(" robustness=%d", MLD_QRV(bp[MLDV2_QUERY_QRV]));