OpenView Network Node Manager: Designing and Implementing an Enterprise Solution

Fine-Tuning the Discovery Filter

First discovery is quite a thrill. Watching the Internet submap as NNM discovers a new network is always a fresh experience. Once that discovery is complete, it’s time to assess what’s in the database. The discovery filter is often initially left open to identify every IP addressable device. This bloats the NNM database. So now it’s time to inventory all the OIDs on the network. Many familiar OIDs will be present, but some unexpected ones are found that have to be tracked down. NNM ships with a large, helpful list of well-known vendor OIDs, but your network may host some mystery vendors.

Armed with fresh insight into the network components, you will probably have to modify the filters file to include additional ...