6.2.3 Changing the order for node name resolution
By default, NNMi attempts to identify a node in the following order:
Short DNS name
Short sysName
IP address
- Important
If you change a node's host name, there is a delay before NNMi data reflects the name change, because NNMi caches DNS names to enhance performance.
The following scenarios describe situations in which you might want to change the default order for node name resolution:
If your organization is dependent on others to update the DNS configuration, you might set a policy for defining the sysName for each new device as it is added to the network. In such a case, you would set sysName as the first choice for node name resolution so that NNMi can discover a new device as soon as it is deployed in the network. (Maintain the sysName over the life of the device.)
If your organization does not set or maintain the sysName for managed devices, select sysName as the third option for node name resolution.
- Tip
If you use the full or short DNS name as the primary naming convention, confirm that you have forward and reverse DNS resolution from the NNMi management server to all managed devices.
When the full DNS name is the naming convention, labels on the topology maps can be long.
NNMi selects the lowest loopback address as the management address for Cisco devices, so put DNS resolution on the lowest loopback address for each Cisco device.