OpenView Network Node Manager: Designing and Implementing an Enterprise Solution

Nuggets in the Configuration Alarms Category

NNM examines device configuration information periodically according to the schedule set in the polling configuration GUI. NNM reports any changes, errors, or inconsistencies as a configuration event. It is the author’s humble opinion that the configuration alarms category is the most useful NNM feature of all. It’s the network manager’s friend. Here is a list of common configuration alarms NNM may report:

• a device subnet mask differs from the correct one for that subnet

• the MAC address of a device changed

• a device’s route points to a device that’s not a router

• the name of a device changed

• a new interface is found in a device

• a new node is discovered or deleted

• a device’s sysObjectID changed