There are two flavours of CMX.
CMX-Presense
CMX-Location
For CMX-Presence, you do not require Prime Infrastructure, it simply gives stats around device count, type,etc
CMX-location, since it require map information, you need to have PI to import those maps to CMX
Refer below two post to get a feeling of those two types
https://mrncciew.com/2015/10/23/cisco-cmx-10-2-part-1/
https://mrncciew.com/2016/06/10/cisco-cmx-10-2-part-2/
HTH
Rasika
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