Re: Which EtherTypes are recognized for 802.1AD / QinQ ?

13.05.22 12:14, I.C.H пише:
>
> Hi all,
>
> i allready asked the question in the FreeBSD Forums, but i was told to 
> better aks this question in the mailing list to be sure.
>
> You can find my question and all the answers given in this topic here: 
> https://forums.freebsd.org/threads/which-ethertypes-are-recognized-for-802-1ad-qinq.85152/
>
> I will also quote the initial question at the end of this email.
>
> Thanks for clarify my question.
>
> Kind regards
> I.C.H
>
>
> Hi all,
>
> 802.1AD defines the EtherType / TPID as 0x88A8.
> FreeBSD supports 802.1AD (QinQ tagging), see 
> https://www.freebsd.org/cgi/man.cgi?ifconfig(8) 
> <https://www.freebsd.org/cgi/man.cgi?ifconfig(8)> -> vlanproto
>
> Before IEEE passed 802.1AD , there were proprietary standards for VLAN 
> stacking, often called 802.1QinQ or similar. Sometimes, vendors used 
> 0x9100, 0x9200 or 0x9300 as EtherType for the "outer" tag, but some 
> switches can also insert 0x8100 into another 0x8100.
>
> Today, its still possible to buy switches with QinQ-capability with 
> proprietary QinQ implementation which uses some non-802.1AD-compliant 
> EtherTypes. Not all offer the ability to change the EtherType to 
> 0x88A8 or define it by your own, so you have to deal with it.
>
> I am wondering, which EtherTypes are assigned internally in FreeBSD to 
> be handled as QinQ ?
>
> I googled a bit and found this, but i am not sure if it will answer my 
> question: https://reviews.freebsd.org/D21846 
> <https://reviews.freebsd.org/D21846>
>
> Thanks for helping to clarify this topic.
>
> Kind regards
>
>

Brifely reading sources I can tell that non-802.1ad tags supported only 
by ng_vlan(4).