How to setup freeradius for cisco url-redirect?

[放屁大王]

hi all,
       how to setup url-redirect with cisco 3550? I tried it with: 
EAP-MD5,cisco 3550,freeradius 2.1.11, but failed;
my users:
testuser  Cleartext-Password  := "testuser" 
        cisco-avpair = "url-redirect=http://10.32.9.41";, 
        cisco-avpair += "url-redirect-acl=redirect_acl" 


thanks
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