Microsoft: Verify Successful Replication to a Domain Controller

To verify successful replication to a domain controller, please follow the steps below:

1. Open a Command Prompt as an administrator: On the Start menu, right-click Command Prompt, and then click Run as administrator. If the User Account Control dialog box appears, provide Domain Admins credentials, if required, and then click Continue.
    
2. At the command prompt, type the following command, and then press ENTER:

          repadmin /showrepl <servername> /u:<domainname>\<username> /pw:<password>


Reference:
Verify Successful Replication to a Domain Controller
http://technet.microsoft.com/en-us/library/cc794749%28v=ws.10%29.aspx