In this type of monitoring, Directory Proxy Server listens for errors on the traffic between Directory Proxy Server and the data sources. This type of monitoring is called reactive monitoring because Directory Proxy Server reacts if an error is detected, but does not actively test data sources.
You can use DSCC to perform this task. For information, see Directory Service Control Center Interface and the DSCC online help.
Set the monitoring mode for the data source to reactive.
$ dpconf set-ldap-data-source-prop -h host -p port datasource monitoring-mode:reactive
Configure an alert to be sent when an error is detected or when a data source goes offline or online, as described in Configuring Administrative Alerts for Directory Proxy Server.