We have a wierd problem with our Catalyst 2960 switch.
The switch is connected to a 4510 switch at our provider via a 1000BASE-BS-D module. At the provider end and in the 2960 sh int says 1000 full duplex.
We havent done any settings on the port.
When we do a test internally on the switch we can create a throughput at 120/120 Megabyte a second which means full duplex and everything is fine.
When we go through our ISP we can have exactly 120 Megabyte a second in total. It looks like half duplex but link says full 1000.