http cookie persistence

Bellow are the 2 irules i tried an no luck ,experts any help on this .

when HTTP_REQUEST {

 if { [HTTP::cookie exists "EO_SESSION_ID"] } {

 persist uie [HTTP::cookie "EO_SESSION_ID"] 3600

 } else {

 set jsess [findstr [HTTP::uri] "EO_SESSION_ID" 1 ";"]

 if { $jsess != "" } {

 persist uie $jsess 3600

 }

 }

}

when HTTP_RESPONSE {

 if { [HTTP::cookie exists "EO_SESSION_ID"] } {

 persist add uie [HTTP::cookie "EO_SESSION_ID"] 3600

 }

}

Tried even with switch statement.

when HTTP_REQUEST {

  switch [string trimleft [HTTP::cookie EO_SESSION_ID] cookie] {

  "cookie1" {

      pool prod-pool member 192.168.1.1 5700

  }

  "cookie2" {

     pool prod-pool member 192.168.1.2 5700

  }

  default {

     pool prod-pool

  }

  }

}

Instead of irule can i use cookie hash persistence.