14.7.3 Known issues when cleaning Up IPv6 inventory
You could experience leftover IPv6 inventory in the following situation: Suppose that NNMi successfully uses SNMP to manage an IPv6 node, then the node becomes inaccessible before the next discovery. Due to the design of the existing discovery system, the discovery process cannot update a node that loses its ability to communicate using SNMP. To remove such remaining nodes, first fix the communication problem, then, from the NNMi console, on the Actions menu choose Polling, and then the Configuration Poll command to obtain configuration information from these nodes. For a native IPv6 node, delete the node directly from the NNMi console.