1. Ensure the "Automatically Reconfigure Interfaces" parameter in the Reconfiguration subview of the model is set to Yes
2. Check the device to see if it is configured to update the ifNumber, ifTableLastChange and/or ifStackLastChnage attributes when a configuration change is made.
3. If this is a Cisco device, the device may have gone through a re-indexing of the interfaces where the ifNumber, ifTableLastChange and/or ifStackLastChnage attributes do not change. If this is so, you can configure the Cisco device to not re-index the interfaces. Please reference "Interface Index (ifIndex) Persistence
" for more information.