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It seems to me the only way a VLAN identifies as QinQ is if one of the ports is labeled "Q".

How do I setup a QinQ pass-through so it comes in one port labeled and out another port labeled? If I just put "T" on the two ports, will it function as a QinQ tunnel, or does it need to know the TPID for this VLAN is intended to be 0x88a8?

Thank you, Chris

Q on customer ports. T on ports between switchs.

I mean, what do I do in the case of a QinQ tunnel going right through the switch (no "customer" ports on the switch)... what then?

Like already writen, T between switchs. Netonix switch only check the outer VLAN.

Like already written, how do I tell it the TPID for this VLAN is intended to be 0x88a8?

I'll just try your suggestion. It sounds like an incomplete implementation if you cannot specify S-VLAN or C-VLAN, but I suppose if it works it works (as long as you don't have overlapping VLAN numbers).

No, you can't specify ether type, the switch T option seem to look only at outer VID, not ether type (or accept both ether type).

Q option encasulate with ether type 0x88A8 while the D (Double VLAN) option encapsulate with the ether type 0x8100.

Not sure what would happen if a S-VLAN and C-VLAN was overlapping but probably a mess lol.