from... Oracle® Fusion Middleware Administrator's Guide for Oracle Internet Directory
11g Release 1 (11.1.1)
Part Number E10029-02
Enables multiple sites, acting as equals, to manage groups of replicated data. In a multimaster replication environment, each node is both a supplier and a consumer node. Multimaster replication can use either LDAP or Advanced Replication as its transport mechanism. The full DIT is replicated on each node. Replication is always peer-to-peer.
hope this helps.