Date: Mon, 11 Jul 2011 22:52:39 -0700 From: Doug Barton <dougb@FreeBSD.org> To: Charles Sprickman <spork@bway.net> Cc: YongHyeon PYUN <pyunyh@gmail.com>, "freebsd-net@freebsd.org" <freebsd-net@freebsd.org>, David Christensen <davidch@broadcom.com>, David Christensen <davidch@freebsd.org> Subject: Re: bce packet loss Message-ID: <4E1BE127.9060200@FreeBSD.org> In-Reply-To: <alpine.OSX.2.00.1107120143390.1070@freemac> References: <alpine.OSX.2.00.1107042113000.2407@freemac> <20110706201509.GA5559@michelle.cdnetworks.com> <alpine.OSX.2.00.1107070121060.2407@freemac> <20110707174233.GB8702@michelle.cdnetworks.com> <alpine.OSX.2.00.1107072129310.2407@freemac> <5D267A3F22FD854F8F48B3D2B523819385C32D96B7@IRVEXCHCCR01.corp.ad.broadcom.com> <alpine.OSX.2.00.1107082009350.1070@freemac> <5D267A3F22FD854F8F48B3D2B523819385F12FE86B@IRVEXCHCCR01.corp.ad.broadcom.com> <alpine.OSX.2.00.1107112234460.1070@freemac> <4E1BDD3F.4090607@FreeBSD.org> <alpine.OSX.2.00.1107120143390.1070@freemac>
next in thread | previous in thread | raw e-mail | index | archive | help
On 07/11/2011 22:47, Charles Sprickman wrote: > On Mon, 11 Jul 2011, Doug Barton wrote: > >> On 07/11/2011 21:09, Charles Sprickman wrote: >>> I've had it hammered into my brain over the years that for servers it's >>> always best to set link speed and duplex manually at both ends to remove >>> any possible issues with link negotiation. >> >> That hasn't been the right thing to do for at least 8 years or so, >> probably 10 or more. >> >> Yes, back in the 90's when all of this stuff was still new it was not >> uncommon to have autonegotiation issues, but any even sort of modern >> hardware (on either side of the link) will do better with auto than not. > > Some of us still work at places where the hardware is 10 years old, you > know. :) True ... hence my careful specification of "sort of modern." :) > I do still see fixed setups in service provider handoffs - for example > this colo, Level3 and Hurricane. Also all our metro ethernet stuff > specifies a fixed configuration. > > From what I can gather, this seems to be the standard practice in that > space, but then again you're supposed to be plugging into equipment that > wouldn't have the buffer issues that a $450 Dell switch would have. Well one could also say that this sort of thing tends to result from the, "There is a knob, I MUST twist it!" syndrome. > The rule I recall is never do autoneg on one side and fixed on the > other, that more often than not will end up in a duplex mismatch. Yes, that's definitely true, and I should have mentioned it. Whatever you do on one side (auto/manual) you must also do on the other. Doug -- Nothin' ever doesn't change, but nothin' changes much. -- OK Go Breadth of IT experience, and depth of knowledge in the DNS. Yours for the right price. :) http://SupersetSolutions.com/
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?4E1BE127.9060200>