Up-to-Dateness Vector is an Active Directory metadata vector that records, for each change origin, the highest USN already known by a domain controller.
Simple definition
Up-to-Dateness Vector is an Active Directory metadata vector that records, for each change origin, the highest USN already known by a domain controller. It belongs to the Active Directory vocabulary and is useful when reading architecture diagrams, product documentation, logs, or administration procedures.
What is it used for?
Its main purpose is to prevent replication loops and avoid sending changes a partner already has. The practical value depends on the surrounding architecture, security model, and operational requirements.
How does it work?
Unlike the partner-specific high-watermark, the UTD vector tracks change origin and helps multi-hop replication decisions.
Key points
- Scope: An Active Directory metadata vector that records, for each change origin, the highest USN already known by a domain controller.
- Operational goal: Prevent replication loops and avoid sending changes a partner already has.
- Implementation: Unlike the partner-specific high-watermark, the UTD vector tracks change origin and helps multi-hop replication decisions.
Points to watch
These values are internal to the AD engine; analyze them with replication tools rather than trying to reset them manually.
In short
Up-to-Dateness Vector = an Active Directory metadata vector that records, for each change origin, the highest USN already known by a domain controller. Use it when you need to prevent replication loops and avoid sending changes a partner already has.