VLANs over bond mode 6 (balance-alb) bridge interface are not supported as this mode is incompatible with VLAN bridge interfaces.
Workaround: There are two workarounds for this problem:
Use bond mode 6 as a bridge interface; do not use VLANs over bond mode 6.
Use VLANs over bond modes (1=active-backup or 4=802.3ad) as a bridge interface.