[Help-gnu-radius] Problem with GNU radius and cisco privileges

[Алексей Быков]

I am sorry for anxiety, but to access any more to whom. 
I the beginner in GNU Radius. A situation such:
Is Cisco 1721 and a server with installed GNU Radius. Simple authentification 
works.
How to customise GNU Radius that it depending on the entered user name and the 
password on Cisco, distributed appropriate privileges from 1 to 15. I know that 
it is necessary to specify Cisco-AVPair = "shell:prv-lvl=15", but here in what 
precisely configuration file and what correct syntax of this command, I cannot 
understand. What strings, and it is necessary to register in what configuration 
files, that all has correctly earned in my situation? I have studied a manual 
on GNU radius, but the answer to the question have not found. 
Let will seem silly to set such questions, but more nobody could give the 
intelligible answer.
In advance to you it is grateful
                                                                                
                B.Alexey