506 WebSphere Application Server V8.5 Administration and Configuration Guide for the Full Profile
Session affinity
Session affinity means that all requests of the same JSESSIONID are sent to the same
application server, regardless of the LoadBalanceWeight.
When using round robin for the LoadBalance option, the following options are available to
handle affinity requests:
Configure the parameter IgnoreAffinityRequests to true. The affinity requests do not lower
the weight. This behavior might cause an uneven distribution of requests across the
servers in environments that make use of session affinity.
Configure the IgnoreAffinityRequests to false. The weight is lowered by each affinity
request, leading to a more balanced round robin environment. ...