Excessive Collisions After FC1 Installation
Scot L. Harris
webid at cfl.rr.com
Wed Jul 28 18:50:03 UTC 2004
On Wed, 2004-07-28 at 14:13, Christopher A. Smith wrote:
> >
> > I would start by verifying the duplex settings on the NIC in the FC1 box
> > and the port on the switch. mii-tool should let you check the setting
> > and force it. 100Mbp connections should be set to full duplex.
> >
> > I have seen some cisco switches that fight with some systems (in my
> > experience SUN servers had this problem). The auto-negotiate would not
> > work as expected for some reason. Lock down the speed and duplex
> > settings on the switch and the NIC to eliminate this as a possible
> > problem.
>
> Yep, that was the problem. The NIC was in half-duplex and is much happier
> in full-duplex.
>
> I didn't even think of that because auto-negotiation has been running fine
> here for so long. Oh well.
>
> Thanks!
No problem! Glad it was something simple like that. I spent way to
much time the first time I saw this problem. Could not get several SUN
servers to run at full speed on the network. Tried all kinds of stuff
until I figured out how to look at the duplex options on the SUN
interfaces.
BTW: are you using Cisco switches? If so what model? I have seen this
problem using Cisco 3548 and 2924 switches as well as with a bigger
Catalyst switch. At the time I figured it was more of a problem with
the SUN servers interface but I am beginning to wonder if
auto-negotiation has an intermittent problem on Cisco equipment.
--
Scot L. Harris
webid at cfl.rr.com
You don't become a failure until you're satisfied with being one.
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