Need assistance with Persistance

We have our Pre-Prod setup in which the servers were old Windows boxes which were using aspsession_persist as their persistence. Now the servers have been migrated to new Windows boxes, with still the same persistence was in place ,the user reported that they are getting the intermittent session timeout. So for test purpose, we set it for Cookie and it worked fine but since the Prod environment is still using old Windows box and it has not yet been migrated, Business needs to check if there could be an Irule that works in the similar fashion as of a cookie persistence to maintain consistency in the Environments.