I replaced the cable today with similar straight-thru cable. Links seem to autonegotiate now to a-1000. Tried plugging and unplugging cable several times, and every time autonegotiation went fine.
Still a bit confused about the root cause of this problem. I was able to fix the autonegotiation on the old cable yesterday by executing 'media-type rj45' on suspended port. After that, port seemed to perform autonegotion again and suspended state was raised. Didn't see the problem resurface again even after reverting back to 'media-type auto-select'. -Juuso On Sun, Nov 22, 2009 at 6:52 PM, Juuso Lehtinen <[email protected]>wrote: > Thanks to all for answers, > > Cables straight-thru, and identical cables are used for the working and > suspended trunks. > > I will try replacing the cable with a new one tomorrow. If that does not > help, will try disabling autonegotiation. > > > > On Sun, Nov 22, 2009 at 6:05 PM, Nick Hilliard <[email protected]> wrote: > >> On 22/11/2009 12:46, Juuso Lehtinen wrote: >> >>> Any ideas what might be causing this. I wonder if I'm running into some >>> kind >>> of minimum cable length problem. Switches are sitting adjacent to each >>> other >>> in a rack and connected with very short cables (0.5m ~ 2 ft). >>> >> >> Are you sure you're using the correct cable type? Either you should use a >> regular 568-B straight-thru cable, or else you should use a full GE >> crossover cable, which is wired like this: >> >> 1. white/orange -> white/green >> 2. orange/white -> green/white >> 3. white/green -> white/orange >> 4. blue/white -> brown/white >> 5. white/blue -> white/brown >> 6. green/white -> orange/white >> 7. white/brown -> white/blue >> 8. brown/white -> blue/white >> >> Note that for a 100M cross-over, you only cross orange with green, but for >> GE, you need to cross blue with brown too. >> >> Even if you're sure about the cabling, it's no harm to test it out with a >> decent cable tester. Maybe there's something strange going on with the UTP >> termination plugs? >> >> Cable length is only a problem where you use co-ax, as the co-axial cable >> medium can encourage all sorts of strange effects (signal reflection, timing >> problems, etc). >> >> Nick >> >> > _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
