Chapter 12. Replication
Replication is one of the most important and perhaps complex
components of Active Directory. The infrastructure behind Active Directory
replication, including the site topology,
connection objects, and the KCC, was covered in
Chapter 11. This chapter focuses strictly on some of
the tasks and processes associated with replicating data and checking
replication health. For an in-depth overview of how replication works in
Active Directory, we suggest reading Active
Directory, Fifth Edition by Brian Desmond et al.
Determining Whether Two Domain Controllers Are in Sync
You want to determine whether two domain controllers are in sync and you do not have objects to replicate to each other.
Using a command-line interface
By running the following command you can compare the up-to-dateness vector on DC1 and DC2:
> repadmin /showutdvec
<DC1> <NamingContextDN>> repadmin /showutdvec
By running the following command you can compare the up-to-dateness vector on a domain controller named DC1 and a domain controller named DC2:
Get-ADReplicationUpToDatenessVectorTable -Target DC1,DC2
To determine whether two or more DCs are in sync from a replication standpoint, you need to compare their up-to-dateness vectors. Each domain controller stores what it thinks is the highest update sequence number (USN) for every DC that replicates a naming context. This is called the up-to-dateness vector. If you ...