I am creating an in-house training session on using the IOS command "show interface". As part of the material, I would like to be able to actually show some error conditions when bringing up a show interface. This has proven harder than I first thought, after a few obvious error conditions such as duplex mismatch, I am somewhat at a standstill as to creating an interface error condition that I can simulate repeatedly. I am looking for ways to increase interface port counters and I need to be able to do this several times for multiple sessions. Any "tips" or tricks on how to simulate interface error conditions would be appreciated.