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/
