Oracle Fusion Middleware Administration Guide for Oracle Directory Server Enterprise Edition

New Directory Server 11g Release 1 (11.1.1) Deployment

If you install a standalone Directory Server instance or are deploying a new replicated topology, set the compatibility mode to DS6-mode to immediately take advantage of the features available in the new password policy implementation. Since a new Directory Server 11g Release 1 (11.1.1) instance is created with the compatibility mode set to DS5-compatible-mode, you will need to remember to advance the instance to DS6-mode before installing it into a replicated topology whose instances are already set to DS6-mode.