The real question is do you want this device to be pushing/popping STags or just passing them along. Most ASICs shouldn't have an issue with the latter but if you need it to manipulate tags it's ...
I think QinQ overly complicated something that already is a clusterfuck. If you are talking about a dedicate WAN switch, personally I'd likely have 1 per carrier, as to isolate things as much as ...
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