Date: Sun, 14 Dec 2014 17:23:50 -0800 From: "David P. Discher" <dpd@dpdtech.com> To: Adam McDougall <mcdouga9@egr.msu.edu> Cc: freebsd-net@freebsd.org Subject: Re: FreeBSD 10-stable (r274577) LACP / IEEE 802.3ad with TP-Link TL-SG2008 - not working Message-ID: <34276C9E-CAEF-4E3F-AA2A-568F2D3099EC@dpdtech.com> In-Reply-To: <3D993418-E632-44BA-8FE2-2F3F34188F20@dpdtech.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>
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[-- Attachment #1 --]
So, I think I’ve identified the issue. In sys/net/ieee8023ad_lacp.c, lacp_pdu_input() has a sanity check :
if (m->m_pkthdr.len != sizeof(*du)) {
goto bad;
}
I added some debugging information in if_lagg, and ran with it. The lacpdu packet that being sent by the TP-Link switch is 4 bytes longer than the FreeBSD "struct lacpdu du”.
em1: lacp_pdu_input-sizeof(du) bad m_pkthdr.len=128 sizeof(du)=124
My packet captures shows the packet size differing as well.
I’m still poking around. I’ve been trying to look for the official LACPDU binary/wire format … if someone can point me to the reference for that, that would be helpful (at least my own understanding).
Not exactly sure what these extra 4 bytes are at the end of the packet. Still trying to figure that out.
-
David P. Discher
http://davidpdischer.com/
AIM: DavidDPD | Y!M: daviddpdz
On Dec 4, 2014, at 8:41 PM, David P. Discher <dpd@dpdtech.com> wrote:
> Thanks Adam -
>
> On Dec 4, 2014, at 1:58 PM, Adam McDougall <mcdouga9@egr.msu.edu> wrote:
>
>>
>> Is the switch side set to "active" for the lacp mode (instead of
>> passive)? Also, try:
>> sysctl net.link.lagg.0.lacp.lacp_strict_mode=0
>>
>> If either of those work, I'll explain more, don't have time to dig for
>> old email right this minute.
>
> Yes, the switch was in active mode. Turn strict mode off (which I thought I did before, but of course this sysctl clears when destroying the interface). So, the LACP did finally negotiated, at least in ifconfig :
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