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

[David P. Discher]

I’m going to look into other switches/routers and read the spec a bit closer, but linux seems to think the LACPDU check is packet size => sizeof(struct lacpdu) :

 - https://github.com/torvalds/linux/blob/70e71ca0af244f48a5dcf56dc435243792e3a495/drivers/net/bonding/bond_3ad.c#L2185



-
David P. Discher
http://davidpdischer.com/
AIM: DavidDPD | Y!M: daviddpdz 



On Dec 18, 2014, at 10:46 AM, John-Mark Gurney <jmg at funkthat.com> wrote:

>> 
>> Good find, Craig.  Also, I found the full LACPDU definition.  It's in
>> section 5.4.2.2, page 33, of the 802.1ax-2008 spec that I linked to.
>> You can see the 4-byte FCS field at the end.  Does your tp_link[4]
>> field look like an FCS?  If so, you need to figure out why it's
>> propagating all the way up to the LACP level.
> 
> It very well could be that the authors of the TP-Link firmware missed
> the comment in 1ax that says the FCS is generated by the MAC, and
> include it in their sending...
> 
> If you could capture the original frame, and check the ether_type
> field, to see if it is 124 or 128... If it's 128, they probably added
> the FCS manually and the the MAC adds it a second time...
> 

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