3.1.1.5.1.7 Urgent Replication
Let N be the NC replica on the server. There are few originating/replicated updates in N that need to be replicated immediately to each destination DC that has an entry in N!repsTo. Updates that need to be replicated immediately are listed below:
Creation of crossRef object.
Updates to schema object (attributeSchema or classSchema).
Deletion of nTDSDSA object.
Deletion of crossRef object.
Update to secret object.
Update to rIDManager object.
Update to pwdLastSet and userAccountControl attributes as specified in [MS-SAMR] section 3.1.1.8.
Unless the DC is running as ADAM or AD LDS, update to lockoutTime attribute as specified in [MS-SAMR] section 3.1.1.8.
The server behavior for urgent replication is specified in section 3.1.1.5.1.6.