what information does a big ip sends to client in its cookie - when using cookie persistence profile ?

Look at this article with cookie encoding algorithm

 

https://support.f5.com/csp/article/K6917

 

F5 sends the pool member info (ip,port) in the cookie. https://support.f5.com/csp/article/K6917

 

Another related link https://devcentral.f5.com/questions/f5-big-ip-cookie-discloses-internal-ip-address-57332