25.2.1 Key concepts of status monitoring
This subsection describes briefly the major changes that were made from NNM to NNMi. For details about NNMi status monitoring, see Monitoring Network Health in NNMi Help.
You complete the configuration through the user interface.
NNMi node groups and interface groups replace the topology filter.
- You can filter groups using only predefined attributes.
- You cannot link groups using Boolean operators.
- Node groups use a device filter instead of the sysObjectId wild card.
- You can restrict the interface groups based on the node groups and interface types to be hosted.
A wide range of control functions makes it easy to exclude unneeded interfaces.
NNMi matches the monitoring configuration according to the level of detail, from highly specific to more general, in order, such as (first) interface configuration, (second) node configuration, and (third) default configuration.
To change the monitoring action throughout the entire system, change all configurations at all levels.
NNMi's status polling (by selecting Actions > Polling, and then Status Poll or by running the nnmstatuspoll.ovpl command) replaces NNM's demand polling (by running the nmdemandpoll command) for determining device status.
As the default, NNMi polls only interfaces that are connected to another known interface through Layer 2 connectivity. You can enable polling of unconnected interfaces and interfaces that are hosting IP addresses.