According to how the SNMP is configured, the Metasys Site Director sends an offline/online notification when any of its children (network engines) are considered offline or online. These events have a structure similar to the Alarm Raised structure, and reports the same set of attributes (Table 1). The eventValue attribute indicates Offline or Online.
When a supervisory device is rebooted or restored after a power failure, the SNMP Agent on the Site Director sends the offline/online notification, and the supervisory device sends the agent coldstart information.