[Bug 264014] QinQ not working with a lot of switches

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=264014

--- Comment #2 from Layer8 <i.c.h@will-hier-weg.de> ---
Thanks for reqly, Zhenlei Huang.

The assumption that only old devices which are End of Life use non 802.1AD
compliant Ethertypes is unfortunately not correct. 

Because I dont know every switch OS on the market, I cant tell how many
Switch-OS use non compliant QinQ Ethertypes. But:

I personally work with Dell Power Switch switches which have Dell OS6
installed. This is a switch OS from Dell, which is old and matured, but still
under development. I was invited to a Dell event in the end of 2022 where the
have shown a roadmap. According to this information, they are not planning to
end support or development of this OS, because its the default Switch OS on
Dell Access Level switches which is included if you buy a Dell Switch (they
also support some other Open Network Operating Systems). 

This is the user guide of the last last major version of Dell OS6 v6.8: 

https://dl.dell.com/content/manual20646349-dell-networking-n-series-switches-user-guide-version-6-8-0.pdf?language=en-us

On page 677 you will find the information, that they are still using 9100 for Q
in Q.

The last update is 6.8.1.3 from August 24 2023. 

They still release new switch series which are supported by OS6 (the last is
the N3200E switch series which was released 2022).

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