[c-nsp] 3750, QinQ & Jumbo Frames?

[Howard Jones]

We're just looking at running QinQ over a network of 3750G switches, and
while I was investigating enabling jumbo frames, I came across this
document:
  
http://www.cisco.com/en/US/products/hw/switches/ps700/products_configuration_example09186a008010edab.shtml#c3
which contains:
"*Note: *If Gigabit Ethernet interfaces are configured to accept frames
greater than the 10/100 interfaces, jumbo frames that ingress on a
Gigabit Ethernet interface and egress on a 10/100 interface are dropped."

It seems to me that I want to have jumbo frames enabled on the trunks to
'make room' for the extra dotq header, but if that means that user ports
can't run at 10/100 that seems like a severe limitation. Also, the
document is from 2005, and doesn't mention QinQ at all.

Is this still really the case with a modern 3750G? Is there anything
that can be done?

There's a sort-of middle area where actually the frame that leaves the
10/100 port would have had the extra layer of dotQ stripped off... is
that what I'm missing in the above?

Thanks in advance for any light anyone can shed.

Howie