Having a weird one with a 3560G-24TS running the latest version of 12.2.25 code. When servers are plugged in and auto negotiating a speed of 1000/Full, whilst I can ping between servers, I can't get much other traffic to pass. If I set the speed on the switch ports to 100/Full, everything comes good. The servers are running a couple of types of card including dlink and intel. They are all gigabit capable cards.
I'm not doing any layer 3 operations here, it's purely traffic on the same vlan / subnet. I was running an older 12.2 release of IOS but upgraded to the latest 12.2.25 to see if that resolved anything, no luck though.
Got some more test to run tomorrow, but anyone seen similar to this?