Simple definition
An invocation ID identifies a domain controller database instance for replication tracking.
Purpose and use
An Invocation ID identifies a domain controller's directory-database instance for replication tracking.
How does it work?
Together with sequence numbers, it helps partners determine which changes were seen and distinguish selected new database instances.
Example and verification
After a supported restore, inspect events and replication convergence using appropriate AD tools.
Points to watch
This GUID is not a user identifier or a value to alter arbitrarily to conceal an error. Incorrect restoration can cause USN rollback and inconsistency.
In short
Instance identity is part of consistency control and should be handled through supported restoration procedures.