[K12OSN] nic bonding -what mode are you using

James P. Kinney III jkinney at localnetsolutions.com
Tue Jul 1 12:28:06 UTC 2008

On Mon, 2008-06-30 at 21:19 -0700, Robert Arkiletian wrote:
> 2008/6/30 James P. Kinney III <jkinney at localnetsolutions.com>:
> > The mode used depends on the need and the hardware. Some nics can't
> > handle having the MAC changed without a reset so that will cause
> > problems. Some modes require switches to support the bond type. Because
> > the outbound traffic (server to clients) is higest, I have used TLB -
> > mode 5 - with switches that do not support link aggregation. For the
> > ones that do support it (also known as IEEE 802.3ad) I use mode 4. I
> Have you seen an actual improvement in throughput with something like
> iptraf using mode 5?

As compared to using a single 1G nic, yes! I used 4 bonded nics in mode
5 for the APS project. The switches supported 802.3ad but that was not
known at the start (and we didn't want to have to configure those as
well). We wound up useing the 802.3ad on one school because of layout.
We were able to trunk 2 lines between two switches as one server was
split between 2 distant location. This provided 1/2 the bandwidth out to
1/2 the client load. The other 1/2 of the client load was connected
directly to the first switch.

I did run a brief bandwidth test but the data was useless as both ends
would need to be bonded. I did not have another machine to run the test
with that was suitable. So I don't have numbers. :(
> -- 
> Robert Arkiletian
> Eric Hamber Secondary, Vancouver, Canada
> Fl_TeacherTool http://www3.telus.net/public/robark/Fl_TeacherTool/
> C++ GUI tutorial http://www3.telus.net/public/robark/
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James P. Kinney III          
CEO & Director of Engineering 
Local Net Solutions,LLC                           

GPG ID: 829C6CA7 James P. Kinney III (M.S. Physics)
<jkinney at localnetsolutions.com>
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