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

[graham]

Thanks everyone for the replies. I have verified the cable and as much
physical as possible; I have it linked to other 1Gb ports on other switches
just fine.  It's decent 5e straight-through cabling. But will return
tomorrow with new cabling.

Jeff Kell mentioned the "speed auto" command. I will try that as well.

Peter R, I will try that IOS load if I can't make any progress - but with
you, I am thinking that I need to 100% confirm that physical is 100%.

-graham 

On 4/15/12 6:59 PM, "John van Oppen" <jvanoppen at spectrumnet.us> wrote:

> You sure your cabling is good?    I have seen this issue when there are 100
> mbit/sec crossover cables involved (ie only crossing over two of the pairs)
> built or something similar.   We use lots of 3550-12Ts to this day and they
> are still quite decent if they fit what you need.
> 
> In your position, I would probably blame it on cabling and start there with
> any investigation.
> 
> John