IFBIF_BSTP_PTP
bridge_ifsetflag(val, IFBIF_BSTP_PTP);
bridge_ifclrflag(val, IFBIF_BSTP_PTP);
if (flags & IFBIF_BSTP_PTP)
breq->ifbr_ifsflags |= IFBIF_BSTP_PTP;