issues with Intel Pro/1000 and 1000baseTX

James Tanis jtanis at
Thu May 14 16:29:33 UTC 2009

Bill Moran wrote:
> In response to James Tanis <jtanis at>:
>> <.. snip ..>
>> Attempting to force 1000baseTX via:
>> ifconfig em1 media 1000baseTX mediaopt full-duplex
>> gets me:
>> status: no carrier
>> After forcing the NIC to go 1000baseTX the LEDs on the backpane are both 
>> off. I can only come to the conclusion that this is a driver issue based 
>> on previous experience and the simple fact that the end user system is 
>> capable of connecting at 1000baseTX. Anybody have any suggestions? I'm 
>> hoping I'm wrong. I'd rather not do an in-place upgrade, this is a 
>> production system and the main gateway for an entire school, when I do 
>> not even know for sure whether this will fix the problem. It's worth it 
>> to me though, having a 1000baseTX uplink from the switch would remove a 
>> major bottleneck for me.
> Try forcing on both ends (I assume the Procurve will allow you to do that).
> One thing I've seen consistently is that if you force the speed/duplex on
> one end, the other end will still try to autoneg, and will end up with
> something stupid like 100baseT/half-duplex, or will give up and disable
> the port.
Ok, I just did that -- I have now attempted to force 1000baseTX on both 
sides and on one side while the other was left auto, all three possible 
combinations resulted in the same behavior (no carrier).
> Also, try autoneg on both ends.  Make absolutely sure the Procurve is set
> to autoneg.
This was the original set up. It is also how I have it set up currently, 
it results in 100baseTX full-duplex on both sides.
> Replace the cable.  If the cable is marginal, autoneg will downgrade the
> speed to ensure reliability.  Use a cable that you know will produce
> 1000baseTX because you've tested it on other systems.
Well, I don't have any verified working cable of the appropriate length 
so I simply switched out the cables for the main server and the backup 
server. They are both cat6 cables crimped with cat5e modules by me. For 
what reason (bad crimp job?) that seemed to fix the issue.

Thanks for the advice!

James Tanis
Technical Coordinator
Computer Science Department
Monsignor Donovan Catholic High School

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