OpenView Network Node Manager: Designing and Implementing an Enterprise Solution

How NNM Uses the Repeater and Bridge MIBs

Let’s follow the sequence of events as NNM goes about autodiscovery. The netmon daemon reads a router name from its seedfile, polls it, and finds a new interface. The appropriate subnet is added to the topology database. Since the router is in the management domain, so are all its subnets, and the new subnet is put in the managed state. A segment with the unique name Segment1 is created and a router icon is placed inside, representing the interface on that subnet.

As new IP addresses are discovered, perhaps from the router’s ARP cache, those that happen to have an IP address on the new subnet are placed in Segment1. When a new repeater or switch is discovered, it is polled to determine how many interfaces ...