The Directory Server Plug-in is a subcomponent of the Directory Server Connector. You configure the Directory Server Plug-in on each Directory Server being synchronized.
This Plug-in does the following:
Enhances the Directory Server Connector’s change-detection features by storing encrypted passwords in the retro changelog
Provides bidirectional support for user attribute and password synchronization between Active Directory and Directory Server (see Using On-Demand Password Synchronization to Obtain Clear-Text Passwords)
Identity Synchronization for Windows used to support only two-way multimaster replication (MMR). Now, the Directory Server Plug-in is also functional in N-way MMR environments.