cisco nopassword username

[xhon]

hello,

I'm working with Cisco 3745 router, and I'm trying  to move local AAA to 
radius.

Local username database looks like this:
username user_a nopassword noescape
username user_a autocommand connect hostname......

In radius I did this:
user_a Auth-Type = Accept
        cisco-avpair = "shell:autocmd=connect hostname.....",
        Fall-Through = 0

But it's no good.
I need the router not to ask for password at all !
Is it possible with Cisco and freeradius ?


regards
Kuba