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HP OpenView System Administration Handbook: Network Node Manager, Customer Views, Service Information Portal, HP OpenView Operations by Paul Weber, Deborah Williams, Tammy Zitello

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Chapter 5. Network Discovery

The default behavior of NNM is to stop the discovery of the network at the first router relative to the discovery station (my IP address + my subnet mask). To prevent discovery of the entire Internet, NNM will not discover beyond the first router it encounters. Early implementations of network management tools had no limitations and would wreak havoc on the entire networked community. One important thing to remember when performing initial discovery is that it is extremely network-bandwidth intensive. Initial discovery is not something you should do during peak network traffic hours. The NNM station performs a ping of all the devices in the arp cache of the router followed by a series of snmpgets until all the devices ...

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