Domain controllers involved in the replication process are identified using two unique identifiers. The first one is the DSA GUID. It is generated during the Dcpromo process, and it will never change during the lifetime of the domain controller. The next one is the invocation ID. In a restore process, it will change, otherwise, the existing domain controllers will identify it as an existing domain controller and will not replicate data over.
The Directory Service Agent (DSA) GUID and invocation ID
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