Starting with this release, J2EE agents support a prioritized (or an affinity-based) selection of login URLs for authenticating users. End users are directed to the URL highest on the list if it is available. If not, the second URL on the list is targeted. If a URL higher on the list becomes available again, the agent switches to that URL.
You can disable this affinity-based selection process if desired, which would allow you to use a round-robin selection scheme.
Benefit - Support for Affinity-Based Login URL Selection: This feature is used when two or more Access Manager instances are deployed in geographically distant locations. To best manage the authentication process, you can give the highest priority to URLs of locally available Access Manager instances, resulting in faster response times.