How LTM attaches information about node to JSessionsID ?

If I may add:

1. The universal persistence iRule (I'm assuming "PI_JSESSION_ID" in this case), should be applied to the universal persistence profile, not the VIP.

    

2. You wouldn't have two persistence profiles then, either universal or cookie.

    

3. If you can support cookies, and there's no specific technical reason to rely on the JSESSIONID from the server, I would recommend standard LTM Cookie persistence. You can change the name of the cookie if you need to, but it is easily the most reliable persistence method.