This object indicates the type of egress the VLAN has on this
port.
tagged(1) - Frames for the specified VLAN egressing this port
have an 802.1Q tag.
untagged(2) - Frames for the specified VLAN egressing this port
do not have an 802.1Q tag.
forbidden(3) - Frames for the specified VLAN are not allowed
to egress this port under any circumstances.