Its good to get your experience Gert - Almost all of my experience to date has been with control of both ends of the link - service provider, managed hosting etc - so believe it or not, I haven't actually run into these issues of forcing only one side of a link. I'll definately keep it in mind for when that happens though!
Cheers!! On 20 August 2010 10:12, Gert Doering <g...@greenie.muc.de> wrote: > Hi, > > On Fri, Aug 20, 2010 at 10:03:12AM +0100, Heath Jones wrote: > > You response appreciated. One fatal assumption though is me only forcing > one > > end of the link - where did that come from? Read back over my post, > keeping > > in mind that I force both ends to 100/full. > > If you can ensure(!) that both ends are always force-config'ed, then > there is nothing wrong with forcing 100/full (except for those devices > where that doesn't really work, unfortunately, there's a number of them). > > The problem is that networks change. A server/router breaks down, gets > exchanged in the middle of the night. Configuration can not be > copy-paste'd > (because it's different hardware), so "duplex full" gets lost. > > These things happen, and in my experience, if a network runs for 5 years, > you have lots and lots of duplex mismatches creep into your network in > various places - we took over a larger hosting business some years ago, > and they had been religiously nailing "manual forced full-duplex!!" > everywhere. I found at least 10 customer connections that had > developed duplex mismatches over time... > > [..] > > Do you have a view on what causes an end (or both ends) of a link to all > of > > a sudden change state and think the other end is not capable of 100/full? > > That is what I am trying to understand. I am also referring to a link > that > > is not erroring like mad and the occurrences might be as low as once per > > week. > > Never seen that. But that could be cabling that "just barely so" works, > and if something changes (humidity, ...) tolerance is exceeded... > > gert > -- > USENET is *not* the non-clickable part of WWW! > // > www.muc.de/~gert/ > Gert Doering - Munich, Germany > g...@greenie.muc.de > fax: +49-89-35655025 > g...@net.informatik.tu-muenchen.de > _______________________________________________ cisco-nsp mailing list cisco-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/