How to configure a Windows Server 2008 Domain Controller as a Global Catalog

Steps to set an additional Domain Controller as a Global Catalog Server

Define Global catalog Server :- Every forest requires at least one Global Catalog server, that's why by default When you create a Windows Server Active Directory Forest, the first domain controller in the forest is automatically configured to be a Global Catalog server. The global catalog is a distributed data repository that contains a searchable, partial representation of every object in every domain in a multi-domain Active Directory forest. A global catalog server is a domain controller that, in addition to its full, writable domain directory partition replica, also stores a partial, read-only replica of all other domain directory partitions in the forest. In this article, I will show you how to set your additional Domain Controller as a Global Catalog Server as well.

Steps to configure ADC a Global Catalog Server :-

1.Open Active Directory Sites and Services, click Start > Administrative Tools > then            click Active Directory Sites and Services.

2.From the left side pane, expand Sites > Default-First-Site-Name> Servers > Domain             Controllers .

3. Now expand the Windows Server 2008 that you want to set as a Global Catalog and right Click its NTDS Settings then click on Properties

4. Under the General Tab, there is a check box beside Global Catalog, if it is unselected then this means that this Domain Controller is not a Global Catalog, if you do want to set it as a Global Catalog server, then select this checkbox and click on Apply then OK. The process it takes the Global Catalog to replicate itself throughout the forest takes time depending on your Active Directory infrastructure.

5. Close Active Directory Sites and Services and then restart the Domain Controller.