Вот отрывок из даташита на 8309SB

Flexible 802.1Q port/tag-based VLAN.

•  Optional 802.1Q tag-VID aware function.
•  Optional VLAN Ingress Tag Admit
• Control.
•  Optional VLAN Ingress Member set
• filtering.
•  Optional ARP VLAN for broadcast packet.
•  Optional Leaky VLAN for unicast packet.
•  Optional 802.1P/Q tag insertion or removal
• on per-port basis (egress).

                                                                                VLAN Entry [A]
VLAN ID [A] [7:0]   14.7~14.0     This register along with byte 15.3~15.0 defines the IEEE 802.1Q 12-bit VLAN identifier of VLAN A.   00000000
Reserved              15.7~15.4                                                                                                                                                 1111
VLAN ID [A] [11:8] 15.3~15.0     This register along with byte 14.7~14.0 defines the IEEE 802.1Q 12-bit VLAN identifier of VLAN A.   0000