How to setup freeradius for cisco url-redirect?

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