[c-nsp] C3550-12T - Gig copper ports won't link at 1Gb

[graham]

I was finally able to get back to it today.  Brand new cabling made the
other end devices link up at 1000.

I confirmed that the previously used cable can still link up 1Gb on a 3560G,
with the same devices.  So, are the phy interfaces on the 3550-12T just that
much more sensitive to a possible impedance issue?  I guess so, eh?

Thanks to all that responded!

-graham


On 4/18/12 3:19 PM, "Lee Starnes" <lee.t.starnes at gmail.com> wrote:

> If I had to guess, there is something wrong with the switch. We have 12 of
> those in service and all connecting to servers with Gig.  Some are AUTO and
> some are hard coded to 1000 full duplex. Ours are running IOS image:
> c3550-i5q3l2-mz.121-13.EA1a.bin or c3550-i5q3l2-mz.121-22.EA1a.bin
> 
> -Lee
> 
> 
> On Mon, Apr 16, 2012 at 5:16 AM, graham <graham at g-rock.net> wrote:
>> Correct - doesn't even link with auto/auto. Can only get it to link at 100.
>> 
>> I am armed with new cabling and try to rule out the physical.
>> 
>> Nothing in the init process that is indicating any bad phy or anything of
>> the sort - I am hoping it's not a bad switch.
>> 
>> Thanks for all the replies.
>> 
>> -graham
>> 
>> 
>> On 4/16/12 5:50 AM, "Keegan Holley" <keegan.holley at sungard.com> wrote:
>> 
>>> > I agree with that.  If it doesn't link at all with auto auto then the link
>>> > pulse frames that control speed negotiation are some how hindered.  Since
>>> you
>>> > have three different devices exhibiting the same behavior on newer code I
>>> > would even skip to the switch being bad.
>>> >
>>> > Sent from my iPhone
>>> >
>>> > On Apr 16, 2012, at 3:55 AM, John van Oppen <jvanoppen at spectrumnet.us>
>>> wrote:
>>> >
>>>> >> Are you saying that the link does not come up with both ends in
>>>> auto/auto?
>>>> >> At least on copper, that would indicate to me that you either have a bad
>>>> >> switch or bad cabling...   Are you sure the unit you have is good?    I
am
>>>> >> plugged into a 3550-12T here at home with a few machines and auto works
>>>> fine
>>>> >> with every nic I have tried.
>>>> >>
>>>> >>
>>>> >> John
>>>> >>
>> 
>> 
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