HP Netsight manual Configuring Node Interface Poll Settings

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Configuring Node Interface Poll Settings

You can configure the parameters which control how NetSight Element Manager polls the contact interface on a selected node via the Poll Settings options in the Interfaces tabbed page in the Properties window (Figure 4-23, page 4-32).

NOTE

The Properties button in the Interfaces tabbed page launches the Interface Properties window, Figure 4-25, with an identical Poll Settings area. Poll Settings information can be configured in either location, with the same effect.

Figure 4-25. The Interface Properties Window

For each node in the database, NetSight Element Manager polls a single interface (for multiple-interface devices, the interface associated with the first valid MAC address detected) via the highest successful polling method (Ping, SNMP MIB I, or SNMP MIB II). By default, the same poll settings are used for all nodes in the database (as determined by the settings in the Polling Options page in the Tools—>Optionswindow), and each node’s status is updated once during the time it takes to poll the entire database. For example, if you have 500 nodes in your database, and your node polling is set at an interval of 10 seconds with 5 nodes polled per cycle, it will take 1000 seconds (100 poll cycles x 10 seconds), or about 16.5 minutes, to poll the entire database. During that time, the contact status of each polled device will only be updated once; the last known contact status is maintained during the time it takes to refresh the database.

You can alter these database settings via the Interface Properties window, if you wish, but they will take effect only if the polling interval that you define for the interface is longer than the duration it takes to poll the node database. Longer poll cycles can be beneficial for non-critical nodes, or nodes for which regular polling would require significant bandwidth cost (for example, those on the other side of a T1 link). By setting a higher polling interval than the node database refresh period, you can reduce the amount of SNMP traffic generated by your NetSight Element Manager station (and any associated bandwidth costs).

4-34 Adding Network Elements to the Node Database