Red Hat DIRECTORY SERVER 7.1 - DEPLOYMENT Deployment Manual page 120

Common Replication Scenarios
Figure 6-4
The total number of supplier servers you can have in any replication environment
is limited to four. However, the number of consumer servers that hold the
read-only replicas is not limited.
NOTE
Figure 6-5 shows the replication traffic in an environment with two suppliers
(read-write replicas in the illustration), and two consumers (read-only replicas in
the illustration). This figure shows that the consumers can be updated by both
suppliers. The supplier servers ensure that the changes do not collide.
120 Red Hat Directory Server Deployment Guide • May 2005
Multi-Master Replication Configuration (Four Suppliers)
Directory Server supports four-way multi-master replication; that is,
replication topologies comprising four supplier servers.