Replication between two sites is known as Intersite Replication. Since bandwidth two different sites is usually very limited, so intersite replication is used to manage and control replication traffic.
Replication between two sites is known as Intersite Replication. Since bandwidth two different sites is usually very limited, so intersite replication is used to manage and control replication traffic.
intersite replication
intersite replication
SMTP
Bridgehead server
compressed
Replication between sites is compressed to optimize WAN bandwidth utilization.
A Bridge head server is a domain controller that is used for intersite replication. This is the point of contact for a domain controller in another site. This passed replication traffic to a domain controller on another site. replication data is compressed and sent over IP or SMTP. To designate a preferred bridgehead server Open Active Directory Sites and Services -- In the console tree, right-click the domain controller that you want to make a preferred bridgehead server, and then click Properties -- On the General tab, click the intersite transport or transports for which this computer will be a preferred bridgehead server, and then click Add.
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Intersite Topology Generator (ISTG), which is responsible for the connections among the sites. By default Windows 2003 Forest level functionality has this role. By Default the first Server has this role. If that server can no longer preform this role then the next server with the highest GUID then takes over the role of ISTG.
Only one domain controller will be used per site to replicate to another site(process called as intersite replication) it could be a bridge head server(selected DC to do replication from the site)or DC selected by ISTG protocol if enabled. there would be lot of DCs in intrasite replication within a site.
if you have not selected any DC as bridgehead server then it automatically follows ISTG - InterSite Topology Generator,chooses its own DC to replicate and if this link is down makes another but if you define bridgehead server,in that case if the link fails the replication stops.