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Overview of NetSight Element Manager
2-18 Customizing NetSight Element Manager
Figure 2-9. The Polling Options
Node Polling
Node polling establishes how often the contact status between NetSight Element Manager
and the IP devices in your node database will be refreshed. You configure node polling by
setting the interval for a polling cycle and the number of nodes that will be polled during
that interval. In essence, you use the node polling options to limit the amount of network
traffic that NetSight Element Manager generates as it polls devices for their status.
The above figure shows the defaults for NetSight Element Manager: a 5-second polling
cycle with 10 poll packets issued within that cycle. With a database of 100 managed
nodes, this means that it will take 50 seconds to poll the entire node database and fully
refresh the contact status of nodes in the List Views, Tree Views, and Map Views — since
there will be 10 iterations of the 5-second polling cycle to determine the contact status
with all 100 nodes.
You can configure polling for an individual node so that it is polled less frequently than
the refresh time required to poll the entire node database. For example, if one of your 100
managed IP nodes was at the far end of a T1 link, and you would like that node to be
polled hourly (rather than at the refresh rate established via Node polling), you could set
an individual poll rate for that device to be 3600 seconds (via the Device Properties
NOTE
The status of polled nodes is maintained as is between polling cycles. If a node goes down
during a polling cycle, its icon will remain Green/Up until NetSight Element Manager
re-polls it and determines the loss of contact. For an immediate update of a specific
node’s status, highlight the device, then select Manage—>Query Status from the primary
window menu bar, or Query Status from the right mouse menu.