Adding a Domain Controller to an Existing Domain

After you create multiple domain controllers, Active Directory 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 of a domain administrator, the password, and the name of the domain, and then click Next.

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. On 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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