Information Technology Reference
In-Depth Information
DC3 is partners with DC2, DC4, and DC5. The topology is designed to ensure that no more
than two DCs lie in the replication between two domain controllers. To put it another way, data
in a replication transfer doesn't have to travel more than three hops to reach its destination DC.
For example, if Active Directory data on DC1 changes, the changes have to hop through DC4,
DC6, and DC7 to reach DC7. A domain controller waits 15 seconds after an Active Directory
change before replicating with its partners, with a 3-second delay between partners. This
arrangement guarantees that all DCs in a site receive changes in less than a minute.
The KCC on each domain controller uses data stored in the forest-wide configuration direc-
tory partition to create the replication topology. The configuration directory partition is repli-
cated to all DCs in the forest, so the KCCs need not communicate with one another. Because they
all run the same algorithm on the same data, the KCCs on domain controllers create the same
replication topology. The KCC recalculates the replication topology every 15 minutes by default
to ensure that the topology accurately reflects DCs that come online or go offline. If necessary,
the replication topology can be recalculated manually in Active Directory Sites and Services. To
do so, right-click the NTDS Settings node under a domain controller, point to All Tasks, and
click Check Replication Topology. You must be logged on to the DC as an administrator to per-
form this task. The partnership between DCs is controlled by a connection object, which the
KCC creates automatically for intrasite replication.
Connection objects
define the connection parameters between two replication partners. The
KCC generates them automatically between intrasite DCs. Generally, you don't need to make
changes to intrasite connection objects, but if you do, they can be changed in Active Directory
Sites and Services. Figure 10-18 shows connection objects in Active Directory Sites and Services,
and Figure 10-19 shows the Properties dialog box for one of the objects.
10
Connection objects
Figure 10-18
Connection objects in Active Directory Sites and Services
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