Two Domain Controllers - suspect possible USN rollback but not sure

My question is I'm not sure if this might be a USN rollback issue.  Should the DC1 and DC2 have the same USN numbers?  I could be way off, but thought they are suppose to match.  This is only one site with two DC's both in the same domain.  There are no replication errors, but we are having issues where some people are not able to login to resources, while others can....

repadmin /showutdvec DC1 dc=domain,dc=local
Caching GUIDs.
Default-First-Site-Name\DC1          @ USN   2289458 @ Time 2012-09-20 17:31:28
Default-First-Site-Name\DC2          @ USN   4392190 @ Time 2012-09-20 17:31:23
Nathan KaufmanAsked:
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MMe12Connect With a Mentor Commented:
It is very unlikely (and not required at all) that DC1 and DC2 will have the same USN numbers. Instead, the DCs should know about each other's USNs, and this can be checked with the repadmin /showutdvec command.

To check for USN issues, run the command for each DC, i.e.
repadmin /showutdvec DC1 dc=domain,dc=local
and then
repadmin /showutdvec DC2 dc=domain,dc=local
The reported USNs of both outputs should be the same for each DC (or at least very close to each other, depending on no. of changes and replication interval).

repadmin /showutdvec dc1 dc=domain,dc=local
Caching GUIDs.
DC2                        @ USN   7339372 @ Time 2012-09-21 10:05:36
DC1                        @ USN  22860030 @ Time 2012-09-21 10:05:42

repadmin /showutdvec dc2 dc=domain,dc=local
Caching GUIDs.
DC2                        @ USN   7339379 @ Time 2012-09-21 10:05:46
DC1                        @ USN  22860029 @ Time 2012-09-21 10:05:39

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However, to check for replication issues it is much easier to use the repadmin /showrepl and repadmin /replsum command on each of the DCs.
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