Query several LDAP servers

[tmp123@menta.net]

Hello,

Please, are you so kind of provide me a hint about how to configure or
develop the following feature?:

A proxy LDAP, like the ones with slapd-ldap, must forward all received
queries to a LDAP server1. If this server contains the requested item,
the answer is send backward and handling stops. If the server doesn't
contains the requested item, the query must be sent to a second LDAP
server2.

In the worst case, a maximum of 5 different servers should be queried in
sequence.

Initially, any server can contain any item. Nowadays, there are no tree
estructure.

Thanks a lot.