A bridgehead server is a server that is mainly used for intersite replication. You can configure a bridgehead server for every site that is created for each intersite replication protocol. This helps to control the server that is used to replicate information to other servers.
Do you need a bridgehead server?
A bridgehead server is a domain controller (DC) that functions as the primary route of Active Directory (AD) replication data moving into and out of sites. ... Therefore, if you have DCs from multiple domains in each of your sites, you'll need multiple bridgehead servers to transport each domain's replication traffic.
How do I find my bridgehead server?
In the left pane, right-click on Monitored Servers and select Add Monitored Server. Use the Add Monitored Server Wizard to add a server in the site you want to find the bridgehead server(s) for. In the left pane, right-click on the server and select Show BridgeHead Servers → In This Server's Site.