OpenDJ can perform subtree replication, for example replicating
ou=People,dc=example,dc=com, but not the rest of
dc=example,dc=com, by putting the subtree in a separate
backend from the rest of the suffix.
For example, in this case you might have a userRoot
backend containing everything in dc=example,dc=com
except ou=People,dc=example,dc=com, and a separate
peopleRoot backend for
ou=People,dc=example,dc=com. Then you replicate
ou=People,dc=example,dc=com in its own topology.
