There can be several servers acting as masters for directory
information, with each master responsible for updating other master
servers and replica servers. This is referred to as peer replication.
You can use the information and example provided here to know more
about it.
Peer replication can improve performance, availability, and reliability.
Performance is improved by providing a local server to handle updates
in a widely distributed network. Availability and reliability are
improved by providing a backup master server ready to take over immediately
if the primary master fails. Peer master servers replicate all client
updates to the replicas and to the other peer masters, but do not
replicate updates received from other master servers.
Note: Conflict
resolution for add and modify operations in peer-to-peer replication
is based on Timestamp. See Replication conflict resolution.
Note: In
a Peer-to-peer replication setup with one replica server for each
peer-master, if the primary master fails, the proxy server directs
the requests to the backup master server. However, the proxy server
will not fall back to the primary master until the backup master server
fails.
The following figure shows an example of peer-to-peer replication: Figure 1. Peer-to-peer replication
