Hi there, the easiest way to do this is to utilize EAP-PEAP with machine authentication. Check out this video from Lab Minutes. It is for an older version of ISE but it should give you the general idea around what needs to be configured:
http://www.labminutes.com/sec0186_ise_13_wireless_dot1x_eap-tls_peap_1
There is part-1 and part-2 and they cover both EAP-PEAP and EAP-TLS.
I hope this helps!
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