HP Network Direr Software Products manual Problems Starting Monitoring for a Device or Link

Key Considerations 315

Problems Starting Monitoring for a Device or Link

data collection, the graph should start showing the monitor’s state history.

Switched Off: The monitor is disabled and so no data is being gathered for it.The monitor may be re-enabled from within the Live Graphs window by selecting it and selecting Monitor > Enable this monitor.See “Disabling and Enabling Individual Monitors” on page 294 for more information.

Data Unavailable: The monitor has been started, but is unable to fetch the data it needs to operate.

This may occur if 3Com Network Director is unable to authenticate with the device to retrieve the monitor data.For example, the wrong SNMP community strings may be configured for the device.You can change the security settings that 3Com Network Director uses for a device from the Security tab of the Properties dialog box for the device. See “Viewing Device Details” on page 229 for more information.

This may also occur if the device does not provide the data required for the monitor.This commonly occurs when you first turn on monitoring for an end station or server. 3Com Network Director will attempt to monitor several services on these devices, such as FTP and HTTP, most of which may not be supported by the device.

Data Unavailable is also displayed for the Utilization monitor of a WAN link if a speed could not be determined for the connection in one or both directions. You can set the speeds for both directions of a WAN link from the General tab of the Properties dialog box for the link. Setting the speeds will automatically start monitoring for a Utilization monitor in this state if the link is being monitored.

A monitor in the Data Unavailable state is not generating any traffic on the network, so may be safely ignored.

There are some devices and links that 3Com Network Director cannot monitor:

Devices Without IP Addresses: Due to the techniques used to monitor devices, 3Com Network Director uses device IP addresses to perform monitoring.If a device does not have an IP address assigned to it, or if 3Com Network Director was unable to determine its IP address during Network Discovery, then 3Com Network Director will not be able to monitor it.