Port is green for long time and occasionally goes into a short cycle where it flashes between green and orange. Then the problem clears and it's solid green. This sequence continues.
The port connects this switch to an old HP AdvanceStak 10BaseT hub (Yeah, I know.)
Previously, I had a Cisco 3560-24ps, and one port on it went to the HP hub. Everything worked fine with default settings on the 3560-24PS, port showed green and all was well. No need to change port speeds or duplex, all set to auto.
The 3560-24ps had to go somewhere else and in it's place is now an updated 3560G-24PS. The default port setting on the new switch to the HP hub handles as described initially, with the cycling period between green and green/orange). In addition, it does the same thing when I try changing any of the port settings to step it down (although this was not needed on the older 3560-24PS). Different ports, same results.
There is no indication of a problem on the receiving side, where everything appears stable. It has been left this way for the past 8 hours now.
I have readjusted port settings several times and experimented with different things.
I want to believe that the 3560G is just more sensitive and, without actually being a error (collision or otherwise), it's saying "Hey, I'm hooked up to a real slow device. What on earth are you thinking!!!!"