Red Hat DIRECTORY SERVER 7.1 - DEPLOYMENT Deployment Manual page 119

Common Replication Scenarios
Figure 6-3 Multi-Master Replication Configuration (Four Suppliers)
Figure 6-4 illustrates a topology where each supplier server feeds data to two other
supplier servers (and to the consumer servers). There are only eight replication
agreements among the four supplier servers, as opposed to the twelve agreements
shown for the topology in Figure 6-3. The topology shown in Figure 6-4 is
beneficial in situations where the possibility of two or more servers failing at the
same time is negligible. Because each supplier has only two fan-outs, such a
configuration is useful in reducing the network traffic and making the servers less
busy.
Chapter 6 Designing the Replication Process 119