This is just one example of a possible root cause for high CPU utilization. In this case the CPU is so busy processing all the received packets that the other IOS processes aren't given access to the CPU resource. For instance the CPU is receiving lots of packets from the hardware because there's a broadcast storm on the network. When either of these two CPU consumers requires the CPU resource to the detriment of the other, then the CPU is too busy. The CPU becomes too busy when either an IOS process consumes too much CPU time or the CPU receives too many packets from the switching hardware. The CPU is doing both of these functions simultaneously. The second is to send/receive packets to/from the switching hardware. The first function is run the different processes under IOS to carry out the function for a switch operating in a network. When the switch has completed the boot process, the CPU has two distinct functions.
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