Per the 4.0 Admin Guide;
The LDAP server stores information about the cluster in a cluster profile. A
cluster profile is an LDAP Organizational Unit that contains a set of LDAP
entries, which include data relating to the Cisco CRS servers, components, and
licenses installed in a cluster. A cluster profile allows the use of the same LDAP
entries for multiple servers.
So you should have an OU in your LDAP that has the cluster information.
If you need the Admin guide let me know.
Mike