Replication - DC4
USN 1217
DC3
USN 2052 -> 2053
DC2
USN 4711
DC1
USN 3388
DC4
DSA GUID
Highest Org. USN
DC1 GUID
4711
DC2 GUID
2050
uStep 1: User added to DC2
lNo changes for DC4
DSA GUID
Highest known USN
DC1 GUID
4711
DC3 GUID
1217
DC4 -
Up-to-dateness vector
DC4 - High
watermark vector
![](slide0053_image347.gif)