How does NFA reacts to device / router IP address change?
In NFA, every device's IP address is considered to represent a separate, unique device. In the case of routers or switches being assigned different IP addresses than those used in NFA, the product assumes each new IP is a new device, and so NFA attempts to use up additional interface licenses to create these new entries in the database.
If the license limit for NFA is close to the maximum, you should merge the old interfaces to the new interfaces using the Interfaces: Physical & Virtual from the Administration menu. Each merge has the option of deleting the old interface from the database to release a license. This allows the data pump on NFA to pump in additional interfaces with the new IP address. Continue this process until all affected interfaces have been merged. If NFA is at the maximum license limit, only two options are available: purchase additional interface licenses to add onto NFA, or delete several interfaces to allow the new IP address to propagate and follow the merge procedure above.
Steps to merge interfaces
Steps to delete interfaces