Recipe 11.10 Modifying the Cost for a Site Link
11.10.1 Problem
You want to modify the cost for a site link.
11.10.2 Solution
11.10.2.1 Using a graphical user interface
Open the Active Directory Sites and Services snap-in. In the left pane, expand Sites
Inter-Site Transports. Click either the IP or SMTP
folder depending where the site link is stored. In the right pane, double-click on the link you want to modify. Under the General tab, you can change the cost for the site link. Click OK.
11.10.2.2 Using a command-line interface
Create an LDIF file called modify_site_link_cost.ldf with the following
contents. Replace <LinkName> with
the name of the site you want to modify.
dn: cn=DEFAULTIPSITELINK,cn=IP,cn=inter-site
transports,cn=sites,cn=configuration,<ForestRootDN>
changetype: modify
replace: cost
cost: <LinkCost>
-
Then run the following command:
> ldifde -v -i -f modify_site_link_cost.ldf
11.10.2.3 Using VBScript
' This code modifies the cost attribute of a site link
' ------ SCRIPT CONFIGURATION ------
strLink = "<SiteLink>" ' e.g. DEFAULTIPSITELINK
intCost = <LinkCost> ' e.g. 200
' ------ END CONFIGURATION ---------
set objRootDSE = GetObject("LDAP://RootDSE")
set objLink = GetObject("LDAP://cn=" & strLink & _
",cn=IP,cn=Inter-site Transports,cn=sites," & _
objRootDSE.Get("configurationNamingContext") )
objLink.Put "cost", intCost
objLink.SetInfo
WScript.Echo "Successfully modified link: " & strLink
11.10.3 Discussion
The cost attribute is one of the most important
attributes of siteLink objects.
cost is used by the KCC to determine what
connection objects should be created to allow domain controllers to
replicate data.
cost is inversely proportional to bandwidth. The
lower the cost, the greater the bandwidth. The number you use for the
cost is also arbitrary; the default is 100. You could use 100-1,000
as the range for your site link costs, or you could use 1-10. The
actual number isn't important, it is relative
based
on
the other site links.
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