I was asked the question recently on how do you determine the overall switch CPU utilization for stacked switches? That is a very good question. The answer may be a little surprising to you. The CPU utilization on a stacked switch config is measured only on the master switch. Below is Cisco documentation to back this answer up:
"Under normal operating conditions, on a non-stackable switch, the CPU is busy at least 5 percent of the time. If the switch is stacked, the CPU is busy at a minimum of 7 or 8 percent utilization. In a switch stack, CPU utilization is measured only on the master switch. The number of members in the stack affects the overall CPU utilization"
Good question that was asked. I hope this has been helpful.
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