Underruns occur when packets are not retrieved quickly enough from shared memory to be transmitted. Probably just happened when he was doing some heavy download , clear the counters and watch it and ask the person if he is having any performance issues . I wouldn't worry about it too much.
Well, I'll take your advice and clear the counters. I'll watch it for the next few days. However, whatever device is on this port is running some critical monitoring application and the tech user who owns the box is complaining pretty often. He says he's dropping packets - notably.
Verify what his nic settings are set at . If they hardcoded then the switch must be hardcoded to the same setting . If it is at auto for speed and duplex the switch setting must also be auto for speed and duplex . If you do a show int status what does his port setting look like is it auto or hardcoded ?
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