Simple definition
A replication inconsistency may occur after an incorrect restoration of a domain controller.
Technical definition
USN rollback occurs when AD update meters return to an earlier state without a compatible restoration mechanism.
What is it used for ?
Identify a restored DC in an unsupported manner.
Practical example
brutally re-establish a snapshot former DC can cause replication problem.
Common issues
- Restoration snapshot Unsupported
- Diverging data
- DC to be rebuilt
Related terms
Key takeaway: Exact behavior and commands may vary depending on versions, products and architectures.
See also: Event ID 2103.