Following are some restrictions associated with LDAP naming services:
Clients prior to Solaris 8 are not supported.
An LDAP server cannot be its own client.
Setting up and managing an LDAP naming services is more complex and requires careful planning.
A NIS client and a Native LDAP client cannot co-exist on the same client machine.
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.