Use the libtcl.cfg file to specify an LDAP server name, port number, directory information tree (DIT) base, user name, and password to connect to an LDAP server.
When you specify an LDAP server in the libtcl.cfg file, the server information becomes accessible only from the LDAP server; the interfaces file is ignored. Open Client and Open Server applications that use the -I option at start-up override the libtcl.cfg file and use the interfaces file. See the Configuration Guide for UNIX.