Netscape DIRECTORY SERVER 6.02 Installation Manual page 67

Upgrade Server C to Directory Server 6.x, and make it a read-only replica of
6.
Server D.
Retire Server A. Disable legacy consumer settings on server D.
7.
This leaves Server D as the single supplier for consumer servers B and C.
When you have completed the migration of your replication topology, you can
evolve it to use multi-master replication. To do this, you must add a new Directory
Server 6.x that acts as a master to your replication topology. You cannot change one
of the read-only replicas to become a read-write replica.
For more information on multi-master replication topologies, refer to the Netscape
Directory Server Administrator's Guide.
Migrating a Replicated Site
Chapter 6 Migrating From Previous Versions 67