Intersite replication takes place between sites. Intersite replication can utilize either RPC over IP or SMTP to convey replication data. This type of replication has to be manually configured. Intersite replication occurs between two domain controllers that are called bridgeheads or bridgehead servers. The role of a bridgehead server (BS) is assigned to at least one domain controller in a site. A BS in one site deals with replicating changes with other BSs in different sites. You can configure multiple bridgehead servers in a site. It is only these BSs that replicate data with domain controllers in different domains by performing intersite replication with its BS partners. With intersite replication, packets are compressed to save bandwidth. This places additional CPU load on domain controllers assigned the BS role. BSs should therefore be machines that have enough speed and processors to perform replication. Intersite replication takes place over site links by a polling method which is every 180 minutes by default.
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[…] configuration partition, domain partitions, and application partitions. Each partition is a unit of replication, and each partition has its own replication topology. Replication is performed between directory […]