Site links have to be manually configured using the AD
Sites And Services console. When creating a site link, the administrator has a number of
configuration options.
Figure 7-7. Replication traffic between two domains within the same site
213 Chapter 7: Using Active Directory and Domains
The first of these configuration options is the replication schedule. An administrator
can determine when replication should occur across a particular site link. When setting the
replication schedule, an administrator will set the replication cost, replication availability,
and replication frequency associated with the site link. When the site link is created and
configured, AD automatically creates a connection object, which will use the information
provided by the site link to actually transfer the information between the domains.
By default and design, all site links are transitive, which allows sites to be used in the
same manner transitive trusts are used. This means that a site can replicate its changes
to another site, via a site connector to a third site, as long as the third site has a valid
connection to both sites. In some organizations in which multiple field offices all connect
to central corporate offices, this kind of replication allows for the greatest efficiency.
All sites replicate their information to the central office site, which in turn replicates the
information back out to the other field offices.
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