I have a Catalyst 2950 switch that is about three years old now and recently I have noticed poor performance by the switch when I copy or move large amounts of data through the switch, for example I have one server in the switch and another in the next switch, the switches are connected via a Cat5e cable at 100baseTX.
As I copy a 50MB file across I can see when runnning a ping to the other switch every 15 or so pings are dropped with request timed out. I am looking to find what show commands I should use to see if I can find where the fault lies. I have used show interfaces so far and I can see high numbers of CRC errors on the switchports that are being used.
Event though the switch is only 10/100 I would not expect it to have any problems copying a 50MB file to another server and certainly not drop packets while doing so. This switch has had to be added recently from recon hardware due to a layer 3 switch failure and as a result we also have a VLAN mismatch on the switch that is being logged, would a VLAN mismatch severely impact the switch performance or would this just be a notification message from CDP and a bit of a red herring?