On Friday, 23.07.2010 at 09:48 +0200, Robert von Bismarck wrote: > From my experience, when you want to be certain, you must force 100mb > networks to 100-full. Auto-neg is mostly hit'n miss, especially on > high-end manageable switches like cisco, extreme networks or HP. > Cheaper linksys or even trendnet (yuk!) usually get it right...
Seriously? I've never seen the kind of behaviour you describe, I'm surprised. One thing to remember is that for auto-negotiation to work reliably, BOTH devices must be set to auto-negotiate. Setting speed or duplex on one end won't work. So, leave all your switch ports to auto-negotiate (usually the default anyway) and this should be fine. A good example of how you can get strange results by messing around with speed and duplex settings is as follows: Device A connects to Switch B Device A and has 'speed 100Mb, full duplex' set on its NIC, switch B is set to auto-negotiate. In this situation, the switch will actually end up with 'speed 100Mb, *HALF* duplex' since many switches can detect hardcoded speeds but not the duplex; they 'play it safe' on duplex. So, this link has 100-Full at one end and 100-Half at the other: a duplex mismatch. Fixing the above normally requires one to remove any hardcoded speed or duplex settings, just let it auto-negotiate. > I've seen this behavior with plenty of equipments running 100mb, like > linux or windows servers, especially on sun/solaris servers and even > cisco routers. At gig speeds auto-neg is mandatory and works well. Agreed :-) Dave. -- Dave Ewart [email protected] Computing Manager, Cancer Epidemiology Unit University of Oxford / Cancer Research UK N 51.7516, W 1.2152
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