Adding a Domain Controller to an Existing Domain

After you create multiple domain controllers, the Active Directory directory service frequently and automatically replicates directory information between them. If a domain controller becomes unavailable, directory information is still available through the other domain controllers.

To add an additional domain controller to an existing domain

1. Click Start, and then click Run.

2. In the Run dialog box, in the Open box, type dcpromo, and then click OK.

3. In the Domain Controller Type dialog box, select Additional domain controller. This creates the domain controller as a replication partner.

4. In the Network Credentials dialog box, type the user name, password, and the name of the existing domain, and then click Next.

   Note

   • You must use a user name and password of the domain administrator group for the existing domain, or a member of that group.

5. In the Additional Domain Controller dialog box, click Next.

6. In the Database and Log Location dialog box, accept the defaults, and then click Next.

7. In the Shared System Volume dialog box, click Next.

8. In the Directory Services Restore Mode Administrator Password dialog box, leave the boxes blank, and then click Next.

9. In the Summary dialog box, click Next.

10. When the Completing Active Directory dialog box appears, click Finish, and then restart Windows.

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