Replication - DC4
DC1
u Step 1: User added to DC2
l No changes for DC4
USN
4711
DC4 - Up-to-dateness vector
DC4
DC2
DSA GUID
USN
3388
DC1 GUID
USN 2052 -> 2053
DC2 GUID
DC4 - High watermark vector
DC3
DSA GUID
USN
1217
DC1 GUID
DC3 GUID