[c-nsp] full duplex mismatch speed - dynamips

Christopher.Marget at usc-bt.com Christopher.Marget at usc-bt.com
Fri Aug 20 11:57:46 EDT 2010


> My favorite is when the sys-admin sets 10-12 prod servers to 100/1000 -
> full
> doesn't tell anyone and then comes back in a panic because the
> "network"
> blew up.


> > I have had so many problems because someone forced 100/Full,
> 1000/Full on a
> > switch and the servers
> > could
> > A) Not set duplex AND speed (some could only set one option)
> > B) Remember what they had been set to after power off
> > C) Admin remembers to set on the server at all!

Two mentions of problems with manually configured gigabit operation.

Is there really a problem in that scenario?  Shouldn't be.

Regardless of what the UI appears to be doing, you can't do gigabit without autonegotiating.  It shouldn't be possible to create a duplex mismatch on a gig link.

Either I'm confused, or this should be added to the list of myths that need debunking.

/chris



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