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Hello
I have some switches SG3216. I have some problems with them becouse they are all connected to one HP-1620-24g as a central switch in star topology. All uplinks are 802.1q tagged interfaces which carried some vlan tags. Sometime communication missed and i have no connection to this switch. After reboot everything is fine. I have active loop detectd, broadcast and multicast storm limited to 128k, dhcp-snooping and stp disabled on all network becouse i dont have redundant connections. All 802.1q sub-interfaces are terminated on Debian Linux machine when i have inter-vlan routing. When i run tcpdump i get something like this:

[CODE]
13:04:47.523104 60:e3:27:f2:eb:a4 (oui Unknown) > Broadcast, ethertype Unknown (0x9900), length 60:
0x0000: 0000 60e3 27f2 eba4 0000 0001 52a7 284e ..`.'.......R.(N
0x0010: 39e4 efbf 6713 46e7 303f d29d 0000 0000 9...g.F.0?......
0x0020: 0000 0000 0000 0000 0000 0000 0000 ..............
13:04:47.523439 60:e3:27:f2:eb:a4 (oui Unknown) > Broadcast, ethertype 802.1Q (0x8100), length 64:
0x0000: 0000 60e3 27f2 eba4 0000 0014 54dc ee06 ..`.'.......T...
0x0010: e1a3 14a4 bf36 8f53 9140 2112 0000 0000 .....6.S.@!.....
0x0020: 0000 0000 0000 0000 0000 0000 0000 ..............
13:04:47.523740 60:e3:27:f2:eb:a4 (oui Unknown) > Broadcast, ethertype 802.1Q (0x8100), length 64:
0x0000: 0000 60e3 27f2 eba4 0000 0028 c4fe 5663 ..`.'......(..Vc
0x0010: b13c 616a 30b0 b7bc d8d3 82e6 0000 0000 . 0x0020: 0000 0000 0000 0000 0000 0000 0000 ..............
13:04:47.524028 60:e3:27:f2:eb:a4 (oui Unknown) > Broadcast, ethertype 802.1Q (0x8100), length 64:
0x0000: 0000 60e3 27f2 eba4 0000 0032 f3e4 7e57 ..`.'......2..~W
0x0010: 0845 cec7 5260 2316 62fc b8e7 0000 0000 .E..R`#.b.......
0x0020: 0000 0000 0000 0000 0000 0000 0000 ..............
13:04:48.098097 ARP, Request who-has 192.168.50.200 tell 192.168.50.1, length 28
[/CODE]

The 60:e3:27:f2:eb:a4 is mac-address of SG3216. Looks like tp-link use unrecognized format of 802.1q ethertype? I haven't find 0x9900 on any ieee ethertypes list.

I am not very sure about your problem, but I am sure the TL-SG3216 supports 802.1q VLAN. You can contact their supporter directly for help.