iRule check for user-agent and set cookie

thank you for the reply, unfortunately, this did not help. I'm progressing slowly, as the suggestion on using the switch syntax made me try this :

when HTTP_REQUEST {
 switch -glob [HTTP::header value "User-Agent"] {
    "*MSIE 6*" -
    "*MSIE 7*" -
    "*MSIE 8*" {
 switch -glob [HTTP::cookie exists "test"] ne ""
    HTTP::redirect "http://test-lab.foo.com:9610/CG510_APR_RedirectCapriURL/"} 
      default {
      pool site-10.130.14.98_29710
    }
  }
}

This rule is accepted and there is a difference in testing using IE & Mozilla, so the browser selection seems to work. I enabled cooking persistence on the VS with a cookie named test. However, that did not help. To me, it looks like the iRule is not able to read the cookie.

regards,

Hans