Re: "Forcing" gigabit link operation

"glen herrmannsfeldt" <gah@xxxxxxxxxxxxxxxxxxxxxxx> wrote in message news:dvuush$cbl$1@xxxxxxxxxxxxxxxxxxx
Manfred Kwiatkowski <kwia4000@xxxxxxxxxxxxxxxxxxxxxxx> wrote:

A Longshine dual-speed hub negotiating 100-full to a Procurve 4000M.

As to the 10mbit issues:

3Com SuperStack II 1100 will negotiate 10-full but connected to some
3C905s will experience a duplex mismatch.

As I understand it, the 3C905, 3C905B and 3C905C are completely
unrelated, other than the similarity in model number.

I don't know which model number(s) the problem was with, but I remember running a datacenter when they were popular, and I had this conversation several times per day, every day:

server admin: Your switch is broken! My server is coming up as [10/full | 100/half] instead of 100/full!
me: Is it a 3com NIC?
server admin: Yes
me: Go get the latest Windows drivers.
[ time passes ]
server admin: It still doesn't work! You didn't fix anything!
me: Did you reboot after you installed the drivers?
server admin: Um, no.
[ time passes ]
server admin: It works now, nevermind.

I once tried to get Solarix-x86 to work on a machine with a
3C905C, but it didn't notice at all. (In addition, I had a bad cable.)

I also used to have a 3C250, I believe on of the earlier models
of fast ethernet (100 only) repeaters. I never had any problems with
that one.

If they were only repeaters, auto-duplex shouldn't have been an issue. I did see a few NICs that insisted on coming up at 10Mb/s when the switch supported 100Mb/s, though.

S

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Stephen Sprunk "Stupid people surround themselves with smart
CCIE #3723 people. Smart people surround themselves with
K5SSS smart people who disagree with them." --Aaron Sorkin

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