iRule not using default pool

Yes, we know about this issue. The problem has to do with successive requests in the same connection. When the first request is complete, the serverside of the connection is detached. After the detach, we don't re-initialize the pool pick to the default one assigned on the virtual.

You can try the following modifications to your rule to save the default pool and reuse it, thus generalizing your rule to be used with many virtuals.

 
 rule cookie_lbsid { 
    when CLIENT_ACCEPTED { 
       set defpool [LB::server pool] 
    } 
    when HTTP_REQUEST { 
       if { [HTTP::cookie exists "lbsid"] } { 
          set tmp [findclass [HTTP::cookie "lbsid"] $::nodes_testlab " "] 
          if { $tmp ne "" } { 
             log local0. $tmp 
             node $tmp 
          } else { 
             log local0. "Not a valid cookie-value!" 
             pool $defpool 
          } 
       } 
    } 
 }