Create a replica AD LDS instance by using the Active Directory Lightweight Directory Services Setup Wizard

1. Click Start, point to Administrative Tools, and then click Active Directory Lightweight Directory Services Setup Wizard.
2. On the Welcome to the Active Directory Lightweight Directory Services Setup Wizard page, click Next.
3. On the Setup Options page, click A replica of an existing instance, and then click Next.
4. On the Instance Name page, accept the default name instance2 (or instance1, if you are installing AD LDS on a second computer), and then click Next.
5. On the Ports page, accept the default values of 50000 and 50001 (if you are installing onto the first computer) or 389 and 636 (if you are installing onto a second computer), and then click Next.
6. On the Joining a Configuration Set page, in Server, type the host name or DNS name of the computer where the first AD LDS instance is installed. Then, type the LDAP port number in use by the first AD LDS instance (which is 389 by default), and then click Next.
7. On the Administrative Credentials for the Configuration Set page, click the account that is used as the AD LDS administrator for your first AD LDS instance.
8. On the Copy Application Partition page, select the application directory partitions that you want to replicate to the new AD LDS instance. (The schema and configuration partitions will be replicated automatically.)
9. Accept the default values on the remaining Active Directory Lightweight Directory Services Set Wizard pages by clicking Next on each page, and then click Finish on the Completing the Active Directory Application Mode Setup Wizard page.
10. After the installation is complete, use the ADSI Edit snap-in to confirm that the selected directory partition has been replicated to your second AD LDS instance.