Re: why clear counters eth0 does not clear all counters
The clear counters command clears the interface counters while the clear controllers ethernet-controller clears the underlying controller. It is a bit difficult to explain the difference between the interface and the ethernet controller. But I would suggest that the interface counters are more oriented to the software that manages the interface and the ethernet controller is the underlying hardware that runs the interface.
0 output buffer failures, 0 output buffers swapped out
Notice that there are lines that are not in your output such as
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
I agree with Rick in that the "sh controllers ethernet-controller ... " command is reading the counters directly from the underlying hardware.
When you use "sh interface fa0/24" what you see is a 5 minute summary derived from the underlying hardware counters. You can clear these counters to reset the summary counters but the underlying counters they are derived from are still there.
At least that is what i think you are seeing, and it seems to make sense.
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