The platform-process “K5L3Unicast Adj Tabl”, that causes the high CPU usage is a platform-process that is active when a new MAC address has been learned and the adjacency table is rewritten. This takes place when in the switch receives an unknown source MAC address, it’s forwarded to the CPU for MAC address learning.
It could be possible to have a device connected to a switch port sending lots of MAC address randomly and massively forcing the switch to spend all CPU capacity just to process the new MAC addresses.
So next step is check the interface statistics looking for the highest traffic rate. Use this link below in order to troubleshoot this issue and find the top offender interface.
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