Hello Guurz,
Simple doubt, Should LDAP master server must be configured as a LADP client as well?
NO! NO! NO! NO! NEVER!
I don't care what you may or may not find in any documentation - never make Sun's LDAP server a client of itself. You can get into situations where, for example, a host lookup causes more recursive host lookups.
And don't set up a multi-master system and make each server a client of the OTHER master - that's even WORSE. The multiple LDAP server processes can deadlock themselves trying to look things up in each other.
The documentation clearly states it is unsupported:
8.Introduction to LDAP Naming Services (Overview/Reference) (System Administration Guide: Naming and Directory Services (DNS, NIS, and LDAP)) - Sun Microsystems
A directory server (an LDAP server) cannot be its own client. That is, you cannot configure the machine that is running the directory server software to become an LDAP naming services client.