OpenLDAP 1.2.x/OpenLDAP 2.0.x
Replicaの設定

slapd.conf
replica host=hostname[:port] binddn="DN"
    bindmethod=simple|kerberos  
    [credentials=password]   [srvtab=filename]
replogfile filename
    master slapd → slurpd → slave slapd

updatedn dn
updateref url
    master slapd ←slave slapd ← ldap client