[88456] in North American Network Operators' Group
Re: Problems connectivity GE on Foundry BigIron to Cisco 2950T
daemon@ATHENA.MIT.EDU (Jeff Rosowski)
Mon Feb 6 12:50:26 2006
Date: Mon, 6 Feb 2006 09:50:00 -0800 (PST)
From: Jeff Rosowski <rosowskij@ie.ymp.gov>
To: Mark Smith <random@72616e646f6d20323030342d30342d31360a.nosense.org>
Cc: Randy Bush <randy@psg.com>, dhubbard@dino.hostasaurus.com,
sam_ml@spacething.org, nanog@nanog.org
In-Reply-To: <20060116091425.57c1b72f.random@72616e646f6d20323030342d30342d31360a.nosense.org>
Errors-To: owner-nanog@merit.edu
> According to "Ethernet, The Definitive Guide", that feature is an
> optional part of the spec.
>
> One thing I've heard people encounter is that if they use a cross-over
> cable, which probably really implies a 100BASE-TX cross-over, then the
> ports only go to 100Mbps. A Gig-E rated straight through, in conjunction
> with the automatic crossover feature, was necessary to get to GigE.
A lot of cross over cables only cross pairs 1-2 with 3-6, leaving 4-5, and
7-8 as straight through. Gig-E uses all four pair.
