IFBIF_DISCOVER
do_bridgeflag(ctx, val, IFBIF_DISCOVER, 1);
do_bridgeflag(ctx, val, IFBIF_DISCOVER, 0);
bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER;
if ((dbif->bif_flags & IFBIF_DISCOVER) == 0 &&