Troubleshooting Interface Changes

If your Interface Group definition results in unexpected membership or the membership changes, consider the strategy NNMi uses to detect Interfaces during Spiral Discovery.

During each Spiral Discovery cycle, NNMi responds to Interface changes as follows:

1. NNMi updates the attribute value of the current Interface object if one (and only one) of the following attributes change:

   • ifIndex or IfAlias or ifSpeed

2. NNMi creates a new Interface object and deletes the old Interface object if any of the following criteria are met:

   1. At least one of these attributes change: ifName, ifDescr (descriptions), ifType, or Physical Address (Mac address, Media Access Control address).
   2. More than one of these attributes change: ifIndex or IfAlias or ifSpeed.
   3. One or more attributes from the list of both criteria 1 & 2 change.

   Note If using nnmconnedit.ovpl configuration files, any connection settings configured for the deleted Interface would be evaluated for the new Interface object’s current attribute settings.