HP Network Direr Software Products manual Monitoring the Network

316CHAPTER 7: MONITORING THE NETWORK

Links Without Suitable Data Sources: When you start monitoring against a link, 3Com Network Director examines the two items at either end and selects one of them as the data source for the link’s monitoring information.

However, some items cannot provide suitable information for monitoring the link. These are as follows:

■Devices that are not monitored in full monitoring mode.Full monitoring mode is the only mode that provides enough information for link monitoring.

■Non-core devices, such as end stations.These do not provide suitable information for link monitoring, even if they are monitored in full monitoring mode.

■Clouds.Clouds are used to represent unknown portions of the network or logical entities within the network and do not represent physical items from which data may be collected.

If neither of the items at either end of a link can provide suitable monitoring information, 3Com Network Director will not be able to monitor the connection.

Layer 3 Connections: Layer 3 connections are used within 3Com Network Director to represent logical connectivity between devices and subnets.They do not correspond directly to an attribute on a network device, and so cannot be monitored.

If 3Com Network Director cannot start monitoring on a selected item or items, you will see an information dialog box like the following: