Regarding high CPU issue and the two processes you have mentioned:
1. Overview of IOS Auth Manager: The capabilities of devices connecting to a given network can be different, thus requiring that the network support different authentication methods and authorization policies. The Cisco IOS Auth Manager handles network authentication requests and enforces authorization policies, regardless of authentication method. The Auth Manager maintains operational data for all port-based network connection attempts, authentications, authorizations, and disconnections and as such, serves as a session manager. So looks like this device is managing good amount of AAA sessions.
can you collect "debug authentication event" and "debug authentication error" if you still see high CPU after re-enabling macro?
"macro auto monitor" enables "device-classifier". when "macro auto monitor"/device-classifier is enabled, every new packet will be given to authmgr for creating session. as part of creating session, authmgr will udpate device-classifier about the mac then device-classifer will classify the device based on mac/OUI this is the basic flow.
if you do not want to use "device classifier", you could disable macro auto monitor.
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