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RE: Problems connectivity GE on Foundry BigIron to Cisco 2950T
From: sam_ml () spacething org
Date: Mon, 16 Jan 2006 01:06:18 +0000 (GMT Standard Time)


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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