How to create Site Link Bridges in Active Directory

Site Link Bridges are used in Active Directory to allow Domain Controllers in different sites to replicate with each other over a non-AD site link.
Here is how to create a Site Link Bridge in Active Directory:

Open the Active Directory Sites and Services console.
Expand the "Inter-Site Transports" folder and select the "IP" folder.
Right-click the "IP" folder and select "New Site Link Bridge..." from the context menu.
Enter a name for the Site Link Bridge in the "Name" field.
In the "Sites in this site link" field, select the sites that you want to include in the Site Link Bridge.
In the "Cost" field, specify the cost of using this Site Link Bridge. A lower cost indicates a preferred link.
Click "OK" to create the Site Link Bridge.

After creating the Site Link Bridge, you can use it to replicate Active Directory changes between Domain Controllers in different sites. You can also configure the replication schedule and replication transport for the Site Link Bridge using the Active Directory Sites and Services console.

Create Site Link Bridges

1) Open Active Directory Sites and Services. Expand Sites.

2) Expand inter-site transports. Right-click either IP or SMPT, depending on the protocol for which you want to disable the default bridging of site links.

3) Click Properties.

4) In Properties, on the General tab, clear the Bridge all site links check box. Then click OK.

5) You have returned to Active Directory Sites and Services. Again, expand Sites, then Inter-site Transports.

6) Right-click either IP or SMTP, depending on the protocol for which you want to create a site link bridge. Click New Site Link Bridge.

7) In the New Object-Site Link Bridge dialog, type a name for this new site link bridge in the name box.

8) Click Add. Then click OK. Your sites will be linked.

Deploying Active Directory