Schema Extensions

To provide the necessary attributes used by Lync Server, it is necessary to extend the AD schema. This process is typically easiest to run on a system that is planned as a Lync Front End Server, and must be run by a user that is currently a member of the Schema Admins group. If an installer user account is temporarily added to the Schema Admins group in preparation for installing Lync Server, it will be necessary to log off of the system and then log back on to reflect the group membership change. Before extending the schema, the following components must first be installed on the system:

• Remote Server Administration Tools, AD DS and AD LDS tools only (available as integrated Windows Features)

• Microsoft Visual C++ 11 x64 redistributable (automatically installed from the Lync media if not present when starting the Lync installation)

From the Lync Server installation media, follow these steps:

1. Launch Setup.exe.

2. When the wizard displays, either browse to your intended installation location or accept the default location, and then click Install.

3. When prompted, read the software license terms; then click the I Accept the Terms in the License Agreement option if you agree to the terms, and click OK.

4. The core components of Lync Server 2013 are now installed, which includes the Lync Management Shell and the Lync Deployment Wizard. When the Deployment Wizard launches, it determines the current state of the environment and provides links to various installation options as needed. In the case of a fresh installation, the option to prepare Active Directory is presented. Click Prepare Active Directory, as shown in Figure 11.1.

Image

Figure 11.1. Running the Deployment Wizard.

Note

To avoid permissions issues, be sure that the domain controller hosting the Schema Master role is online, and that the installer account has Schema Admin credentials, before using the Deployment Wizard.

5. If all the prerequisites are met, click Run on Step 1: Prepare Schema, which launches the wizard shown in Figure 11.2.

Image

Figure 11.2. Preparing the schema.

6. Click Next. This action invokes the Install-CSAdServerSchema PowerShell command, which loads the AD schema files required for Lync Server 2013.

7. When the command has finished executing, click View Log to review the log file and ensure that no errors or warnings were generated during the schema extension process.

8. When finished, click Finish to complete the procedure and return to the Deployment Wizard.

Tip

Particularly in larger network environments, after the AD schema is extended, some time will be needed to allow the schema changes to replicate throughout the forest before moving on to the forest prep stage. To verify that replication has completed, the ADSI Edit utility can be used to verify the values associated with the ms-RTC-SIP-SchemaVersion object. If the value of the rangeUpper attribute is 1150 and the value of the rangeLower attribute is 3, then the schema was successfully updated and replication has completed.

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