Ok, I'm not sure we're on the same track. You say that "IM wasn't able to automatically set the duplex on a link correctly. In my experience it always has to be set manually"
I'm not aware how to make IM "set" duplex for anything. I'm talking about putting 2 devices on a map, SNMP configured - link them up and then IM reports (when you click on an interface) showing either no duplex or FD. And if IM shows that the ends don't match you usually see the bubbling and if the traffic is high enough, the device turns yellow/orange with the warning of tx/rx errors or discards. But I have to admit that maybe I'm using "old thinking". I can remember when studying for my Cisco stuff that many people expressed the idea that Auto-negotiate = ought not to.......... which is to say - nail it when possible. And until lately that has always been possible. However, I have come up against switches that cannot be nailed to 1 gig, they have to auto-neg to gig. On several of my maps IM reports (I think) 1gig Half - which isn't a "normal" setting. Where does IM get it's idea of duplex if not from SNMP?? Is the SNMP from the Vendor wrong?? Kevin -----Original Message----- From: [email protected] [mailto:[EMAIL PROTECTED] On Behalf Of David R Bosso Sent: 27-Jul-07 20:41 To: InterMapper Discussion Subject: Re: [IM-Talk] Intermapper and Half/Full Duplex --On Friday, July 27, 2007 8:22 PM -0400 Kevin Wigle <[EMAIL PROTECTED]> wrote: > Hey Group! > > Lately I've been trying to track down why networks that should be fast, > aren't. > > The support people at the ends don't have a lot of experience. > My biggest problem usually turns out to be a duplex mismatch. > > But - my experience with Intermapper isn't great on this one. > It seems that sometimes (often enough) that Intermapper disagrees with the > device. > > I know Dartware will say: "We're just reporting back what the device > says", but when I > telnet to the device (mostly Cisco and HP switches) and look at the > interface it says something different. > > So, I just want to confirm if you guys see the same as I do. > > When looking at the interface and you see "100 MBit" - does that means > half duplex? > > As opposed to "100 MBit FD" - which presumably is full duplex. > > So if the "FD" isn't there Intermapper is saying that it is half duplex. > Like negative option billing, if it doesn't say FD then its HD?? > > I would rather see an HD. > > Anybody else have experience with confusing Duplex indications from > Intermapper? Interesting. As far as I knew IM wasn't able to automatically set the duplex on a link correctly. In my experience it always has to be set manually if it differs from the default Baseband setting in the "Set Link Speed" dialog box you get when right clicking on a link. If this isn't true for some kinds of devices I'd like to know which ones. FWIW, the vast majority of duplex mismatch problems I see are when someone sets one side of the link to full duplex while leaving the other to auto. The auto side tries to auto-negotiate and getting no response, assumes a dumb hub and sets itself to half. We generally avoid this by using auto everywhere and looking closely at anything that auto-negotiates to half. The only problems we've had with _auto_ not working are with a few older fiber media converters. -David ____________________________________________________________________ List archives: http://www.mail-archive.com/intermapper-talk%40list.dartware.com/ To unsubscribe: send email to: [EMAIL PROTECTED]
