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OK Don't laugh.
I just been surprised with announcement that I am getting promoted will mange our ISE 2.1 platform.
Even though that I am not Jon Snow, I know nothing about it.
Unfortunately paid classes is not an option.
Any good source to get me up...
Free TACACS on Windows
http://www.tacacs.net/
You can also purchase support from them.
PS: Please don't forget to rate and select as validated answer if this answered your question