Date: Thu, 18 Dec 2014 08:16:04 -0800 From: "David P. Discher" <dpd@dpdtech.com> To: Craig Rodrigues <rodrigc@FreeBSD.org> Cc: FreeBSD Net <freebsd-net@freebsd.org>, Adam McDougall <mcdouga9@egr.msu.edu> Subject: Re: FreeBSD 10-stable (r274577) LACP / IEEE 802.3ad with TP-Link TL-SG2008 - not working Message-ID: <EC755754-A98F-43BF-9BF2-B7DDBAD7A023@dpdtech.com> In-Reply-To: <CAG=rPVf19-WpR79xHEbavKLtHE-xpa_jCMQ1_uWyq0HUdpcE7Q@mail.gmail.com> References: <1A44709E-7D0C-4932-8A28-383EAC3F340B@dpdtech.com> <CAOtMX2gEGxTyXjitBu=pjkteocp1pSGxnb%2BWDb_jL3f0YNOjrg@mail.gmail.com> <9AE69175-92D9-49FA-A651-119C7046A1FA@dpdtech.com> <5480D8EF.9000804@egr.msu.edu> <3D993418-E632-44BA-8FE2-2F3F34188F20@dpdtech.com> <34276C9E-CAEF-4E3F-AA2A-568F2D3099EC@dpdtech.com> <CAOtMX2h3U-C9stM5qdix1HCqG=6rZD2GzKQw0t6Raoh6ToL3Og@mail.gmail.com> <2BCFC9D3-3B7D-421F-9FDA-0C4E1018F8F5@dpdtech.com> <CAOtMX2gfcRDWPmSAiNDuxpJC7bbKru90fyOqZe9WShpHL5LW0Q@mail.gmail.com> <A77F34EB-91DD-4FD8-B1BD-B1C9DB5AFE36@dpdtech.com> <CAG=rPVdHdJeBPMWGC5_zAO-e2Q0MXB3UNePXSqYXY6_OOeVX%2BQ@mail.gmail.com> <CAG=rPVf19-WpR79xHEbavKLtHE-xpa_jCMQ1_uWyq0HUdpcE7Q@mail.gmail.com>
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On Dec 17, 2014, at 9:11 PM, Craig Rodrigues <rodrigc@FreeBSD.org> wrote: > > > And here: > > http://www-01.ibm.com/support/docview.wss?uid=isg1VM64842 > Ah, wow … that IBM article - what I’m seeing is the four-byte Frame Check Sequence (FCS). I download the IEEE Std 802.1AX-2008 PDF, Figure 5–8— LACPDU structure, page 33, shows this structure with the FCS field. (802.3ad has evolved into 802.1AX) - The 802.3ad spec PDF is $155. It’s unclear if this was added to a later version spec. And with FCS field, FreeBSD LACP just does not work. So … it would seem that big iron routers and switches either are not adding in the FCS field. Or - it is possible, with how the IBM support article is written - it is possibly this field might be getting stripped by some NIC hardware or drivers. Ok … I’m going to investigate this further. I’m working on getting/borrowing a few different vendors switches with LACP and see what I can find out. - David P. Discher http://davidpdischer.com/ AIM: DavidDPD | Y!M: daviddpdz
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