Date: Sat, 14 May 2022 22:15:29 +0300 From: Oleksandr Kryvulia <shuriku@shurik.kiev.ua> To: freebsd-net@freebsd.org Subject: Re: Which EtherTypes are recognized for 802.1AD / QinQ ? Message-ID: <24558996-2b83-87e8-8d76-e3517246aea9@shurik.kiev.ua> In-Reply-To: <b5c5a210-7525-9c6f-f4cc-8a19e1e1f32f@will-hier-weg.de> References: <b5c5a210-7525-9c6f-f4cc-8a19e1e1f32f@will-hier-weg.de>
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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).
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