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unless
you need them, since they may result in inefficient use of network
bandwidth or poor performance of domain controller logon and
replication functions.Every site must have at least one site link for each site it is
connected to; otherwise, domain controllers in the site will never
replicate with those in the other connected sites.If you schedule your site links to replicate only once a day (say at
3 a.m.), then replication latency may be unacceptably high in
environments in which frequent changes are made to user and group
settings. Using a more aggressive schedule (once an hour) is
recommended in most cases.If you have both a high-speed backbone link, such as a T3 link, and a
slow redundant backup link, such as a 56-Kbps link, between two
sites, you might configure a cost value of 1 for the backbone link
and 100 for the redundant link. That way, the redundant link will
never be used unless the high-speed backbone link is down.Multihomed computers can belong only to a single site.When SMTP is used as the transport for site links, the replication
schedule is ignored.SMTP used as a replication transport consumes about twice the network
bandwidth as RPCs over IP because updates need to be packaged in SMTP
messages.SMTP can be used to replicate schema, configuration, and global
catalog information between sites, but it can't be
used to replicate between domain controllers belonging to the same
domain. If you use SMTP as your transport, then your sites should be
separate domains.To delegate control of sites, right-click on a site
Delegate Control. See Delegation earlier in this
chapter for more information.A site link must contain at least two sites.If you have two or more site links configured as a site-link bridge,
the cost of the bridge is calculated as the sum of the costs of the
links within the bridge.You can delegate authority over sites, subnets, and Inter-Site
Transports (see Delegation earlier in this
chapter). You can apply Group Policy to sites as well (see
Group Policy earlier in
this chapter).Manually created Active Directory connections will not be affected
when Check Replication Topology is used to optimize intersite
communications.You can't use SMTP as an intersite transport unless
you have installed a certificate authority (CA) in your enterprise
and certificates on your domain controllers. This is necessary to
ensure the authenticity of SMTP replication messages as they may be
sent over the unsecured Internet.
See Also
Active Directory ,
Delegation , Group Policy
