I'm experiencing a throughput issue on my LAN. I'm running a 3500 series XL (100mb)switch in our admin building where the users have been reporting a lot of sluggishness and hangups on the systems while performing a RDC connection to one of our production servers.
I did some throughput testing with two identical laptops connected to the 3500 series switch and got speeds between 35 and 45 mbps.
I have a replacement 3560G switch that configured and all ports are on auto detect for speed and duplex. Presently it is a standalone switch not connected to the LAN. When I connect the two laptops to the 3560G and run the throughput test I receive to vastly different but consistent speeds. The first speed is approx 45mbps and the other is 100mbps.
Both laptops have the same 10/100/1000 NIC and the same updated driver. I have changed the speed and duplex on the laptops and switch to 100 full duplex and receive speeds of 45mbps and 90mbps.
When I switch them back to auto detect I get the original throughput speeds again. I even tried another laptop that is also configured the same and I get the same throughput speeds.
Is there a setting or something else that I'm overlooking?