Dell PowerConnect OpenManage Network Manager Web Client Guide 5.1 - Page 253

If ping fails (an endpoint is down) and update network status is configured, then Dell OpenManage Network Manager tries to ping the switch/router in front of the endpoint to determine if that device is reachable. If that device also failed, then the endpoint's status becomes indeterminate. Tip For clarity's sake, best practice has only one monitor per device updating network status. By default ICMP monitoring enables Update Network Status, and monitors all discovered devices. NOTE: Migrating from previous versions automatically replaces any configured Heartbeats with ICMP monitors with Update Network Status enabled. If your previous system had HTTP or SNMP heartbeats, you must manually configure monitors to provide equivalent monitoring in this version. # of Unreachable Attempts before update-The number of attempts to reach the device before Dell OpenManage Network Manager updates the displayed network status of the device. (1100) Click Save to preserve any edits you make, or Cancel to abandon them. Resource Monitors | Monitoring 253