This notification-only enumerated value identifies the type of client interface used to make the last configuration change, such as app, cli, snmp, web, xml, qx, cwmp, mimload, txtload, or appreg. Admins use this to distinguish, for audit purposes, whether a change came in via the CLI, an SNMP set, the web GUI, or an automated provisioning channel like CWMP. For example, this object reporting snmp(3) tells an admin the last change was made via an SNMP SET rather than through the CLI.