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4-34 Adding Network Elements to the Node Database
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).
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—>Options window), 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).
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