6.4.4 Checking for discovery of all nodes
To avoid discovery problems, make sure that NNMi manages only nodes that use a unique IP address that does not appear for any other node in the management domain. For example, if a node suddenly disappears or gets merged with another node in the database, and it is part of a router redundancy group (RRG), there are special requirements. To manage a router that participates in an RRG, you must use a unique IP address (which is not a protected address) as the management address of the router, and SNMP must be enabled on that address. NNMi will not properly manage a router if it tries to use a protected IP address as the management address.
Examine the data in the Nodes inventory view. If any nodes do not have a management address, check the communication settings for those nodes as described in 5.4.1 Checking all nodes for SNMP configuration.
If any expected nodes are missing from the Nodes inventory view, check the following:
For each missing node, verify that the discovery protocol (for example, CDP) is correctly configured.
If a missing node is on a WAN, enable Ping sweep for the auto-discovery rule that includes that node.