How to set/change/enable persistence connections to the same real server for longer periods than what "sticky" function provides. Use persistent-hash capability
Figure below shows an example of virtual server configured to make the ports sticky and to ensure the same clients always go back to the same real server for TFTP and the HTTP port for some application considerations while telnet will remain on the same real server until the sticky age timer is expired
When persistent hashing is configured for a VIP, the round robin predictor for VIP is automatically enabled. This default is used to evenly distribute hash assignments.