> 802.1ad does the "MAC hiding" you're talking about by defining different MAC
> address spaces for the customer's interfaces and the service provider's
> devices which is different than just stacking multiple tags with q-in-q.
802.1ad is really only standardized "QinQ" (with a different ethertype). I does
not
do MAC hiding and therefor has exactly the same scalability issues as QinQ.
802.1ah (PBB) does MAC hiding, both you need an ASR9k for that, not exactly
a cheap bridging CPE...
Lukas
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