Problems connectivity GE on Foundry BigIron to Cisco 2950T

Mon Jan 16 01:06:18 UTC 2006

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 at dcptech.com http://dcp.dcptech.com
>
>
>> -----Original Message-----
>> From: owner-nanog at merit.edu [mailto:owner-nanog at merit.edu] On
>> Behalf Of Mark Smith
>> Sent: Sunday, January 15, 2006 5:44 PM
>> To: Randy Bush
>> Cc: dhubbard at dino.hostasaurus.com; sam_ml at spacething.org;
>> nanog at 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 at 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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