Information Technology Reference
In-Depth Information
In a site link's Properties dialog box, you can add or remove sites that use the link for repli-
cation. In Figure 10-24, Site217-Pittsburgh and Site247-Phoenix use the site link, but Site200-
Dallas does not. You can change the replication cost and frequency in this dialog box, too. (The
cost attribute was discussed in Chapter 4.) By default, intersite replication occurs every 180 min-
utes, seven days a week. If you click Change Schedule, you can deselect days or times when repli-
cation can occur. For example, if your WAN link is busiest on Monday through Friday from
9 a.m. to noon, you could exclude these days and times from the replication schedule.
Replication then occurs every three hours at all other times and days.
To create a new site link that uses the IP protocol, right-click the IP folder and click New
Site Link. You should provide a descriptive name for the site link. A site link must contain at
least two sites. A site can exist in more than one site link, however; for example, suppose your
configuration includes three sites: Pittsburgh, Dallas, and Phoenix. Pittsburgh and Dallas could
be contained in one site, and Dallas and Phoenix could be in the other site. Dallas, in this case,
is contained in both sites. This arrangement makes sense if Dallas has WAN connections between
both Pittsburgh and Phoenix. Domain controllers between Pittsburgh and Phoenix can still repli-
cate with one another because of the transitive nature of site links. Because Pittsburgh can repli-
cate with Dallas and Dallas can replicate with Phoenix, Pittsburgh can replicate with Phoenix.
Two other site link configuration options can be configured only in the Attribute Editor tab of
a site link's Properties dialog box. By default, notification of changes doesn't occur between sites,
and replication is based solely on the schedule. You can enable notifications by setting the options
attribute to 1. In addition, data is compressed by default when it's replicated between sites. To turn
compression off, set the options attribute to 4. To combine multiple options, simply add the values
together. Therefore, to enable notification and disable compression, set the options attribute to 5.
10
Activity 10-15: Creating a Site Link
Time Required:
15 minutes
Objective:
Create a new site link.
Description:
You have created a site and now have a domain controller in the site. Next, you
create a site link to configure replication between Site100 and Site200.
1. Log on to
Server1XX
as Administrator and open Active Directory Sites and Services, if nec-
essary.
2. Click to expand
Sites
and
Inter-Site Transports
, if necessary.
3. Right-click the
IP
folder and click
New Site Link
. In the Properties dialog box, type
Site100-
200
in the Name text box.
4. In the Sites not in this site link list box, click
Site100
, and then click the
Add
button. In the
same list box, click
Site200
, and then click
Add
again. Click
OK
.
5. If necessary, click to expand
IP
in the left pane. In the right pane of Active Directory Sites
and Services, right-click
Site100-200
and click
Properties
. Click the
Change Schedule
button.
Notice that replication takes place all day every day.
6. Drag to form a box around Monday through Friday from 8 a.m. to 3 p.m, and then click
Replication Not Available
. Now Site 100 and Site 200 won't attempt to replicate during
these times. Click
OK
.
7. Click in the
Cost
text box and type
200
. Recall that the higher the cost of the link, the less
attractive it is when the topology is generated. If there are multiple paths between destina-
tions, the lower cost path is selected. Click
OK
.
8. Close Active Directory Sites and Services, and log off Server1XX.
Bridgehead Servers
To determine the intersite replication topology for a site, the KCC
on one DC is designated as the Intersite Topology Generator (ISTG). To that end, the ISTG is
responsible for assigning a bridgehead server for each directory partition in the site. Bridgehead
servers are responsible for all intersite replication.
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