On Sun, 27 Feb 2005, Lister wrote:
[snip]
I have setup ng_fec on a machine with a quad ethernet NIC :
I have all 4 ports connected to the catalyst. From what I have read on
fast etherchannel in the cisco docs, it is supposed to detect the etherchannel,
e.g. no commands at the switch. Lights blink on and off, change color
(orange -> green) and it seems to work ... but only on one interface in the
bundle. No faster than 80Mb. I have a 1000Mb intel card in the 2nd
test machine that does run much faster than 100.
So, is there something I have done wrong, or what? What should I expect
to get from 4 x 100 Mb ports?
Not really related to FreeBSD's ng_fec at all I think, this is a common FEC issue.
If you are testing this between two hosts as you indicate above, then you are getting exactly the speed you should be getting. The low-end Cisco switches offers two varieties of "load-balancing" over the FEC members, source or destination-based hash (both operate on MAC-address level). So if all your test traffic goes between a set of two mac-addresses, traffic in either direction will only flow over one member of the FEC.
The higher-end devices like the 6500 series can also look at layer 3 and layer 4 flow-information to distribute the load, but basically a FEC is mostly useful in scenarios where you have a large number of hosts communicating.
/leg
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