FreeBSD 10-stable (r274577) LACP / IEEE 802.3ad with TP-Link TL-SG2008 - not working

[David P. Discher]

On Dec 17, 2014, at 9:11 PM, Craig Rodrigues <rodrigc at 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