Hopefully the cisco copper GBIC supports Auto-MDI though, so a straight cable should be good. S On Sun, 15 Jan 2006, David Prall wrote:
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GigE 1000Base-T requires all 4 pairs of wire. Auto-MDI is not supported on the 2950 series, so it won't handle this automagically. I would test with speed set to 100 if the foundry can support 10/100/1000 with the Copper GBIC. Put the two next to each other and test with 1000Base-T crossover cable, removing all the extra stuff if that doesn't work.
1000Base-T requires that pairs 1 and 4 are also crossed along with 2 and 3. http://en.wikipedia.org/wiki/Crossover_cable
David
- -- David C Prall dcp@dcptech.com http://dcp.dcptech.com
-----Original Message----- From: owner-nanog@merit.edu [mailto:owner-nanog@merit.edu] On Behalf Of Mark Smith Sent: Sunday, January 15, 2006 5:44 PM To: Randy Bush Cc: dhubbard@dino.hostasaurus.com; sam_ml@spacething.org; nanog@nanog.org Subject: Re: Problems connectivity GE on Foundry BigIron to Cisco 2950T
Hi Randy,
On Sun, 15 Jan 2006 11:10:04 -1000 Randy Bush <randy@psg.com> wrote:
You are using a crossover cable right?
I'm having a right mare trying to get a Foundry BigIron to connect up to a cisco 2950T, via Gigabit copper.
i was under the impression that gige spec handled crossover automagically
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.
Regards, Mark.
--
"Sheep are slow and tasty, and therefore must remain constantly alert." - Bruce Schneier, "Beyond Fear"
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