This clarifies the confusing area of TIM and VLAN tagging.
VLAN tagging allows switches to filter traffic at multiple levels.
Current TIM design supports VLAN tagging for "802.1Q Tag" case (i.e. IEEE 802.1Q,
More details about its format/spec can be found at http://en.wikipedia.org/wiki/IEEE_802.1Q#Frame_format).
Not supported is VLAN tagging for "802.1ad DoubleTag" case (i.e. IEEE 802.1ad,
More details about its format/spec can be found at http://en.wikipedia.org/wiki/802.1ad#Frame_format).
Note the non-TIM side of MTP supports this. TIM may support this in a future release.