15. Constructing a Distributed Directory Service
For many sites, running one or more slapd(8) that hold an entire subtree of data is sufficient. But often it is desirable to have one slapd refer to other directory services for a certain part of the tree (which may or may not be running slapd).
slapd supports subordinate and superior knowledge information. Subordinate knowledge information is held in referral objects (RFC3296).