ISTG:
2> Open Active Directory Sites and Services: On the Start menu, point to Administrative Tools, and then click Active Directory Sites and Services.
3> In the console tree, expand Sites, and then expand the site that contains the ISTG on which you want to run the KCC.
4> Expand Servers, and then click the Server object for the ISTG.
5> In the details pane, right-click NTDS Settings, click All Tasks, and then click Check Replication Topology.
6> In the Check Replication Topology message box, click OK.
Q Default time for ISTG to establish new connection automatically between 2 sites if Primary ISTG server of either site fails ?
Q Mandatory Requirement for ISTG to be transferred to another server?
Q To transfer ISTG role frm DC to other other Servers ?
Q
What is ISTG ?
Answer: ISTG is nothing but a KCC server(DC), which is responsible
for reviewing the inter-site topology and creating inbound
replication
connection objects as necessary for bridgehead servers in the site in
which it resides.The domain controller holding this role may not
necessarily also be a bridgehead server.
Q
TO generate the replication topology on the ISTG:
1> Determine the server that holds the ISTG role
for the site. 2> Open Active Directory Sites and Services: On the Start menu, point to Administrative Tools, and then click Active Directory Sites and Services.
3> In the console tree, expand Sites, and then expand the site that contains the ISTG on which you want to run the KCC.
4> Expand Servers, and then click the Server object for the ISTG.
5> In the details pane, right-click NTDS Settings, click All Tasks, and then click Check Replication Topology.
6> In the Check Replication Topology message box, click OK.
Q
To generate Intersite replication topology?
A
To generate the intersite replication topology, run the KCC on the
domain controller in the site that holds the ISTG role.
Q
To generate Intrasite replication topology ?
A
To generate the intrasite replication topology, run the KCC on any
domain controller in the site that does not hold the ISTG role.
Q
Event 1009
A
Event 1009 (informational): The consistency checker has started
updating the replication topology for this server.
Q
Event 1013
A
Event 1013 (informational): The replication topology update task
terminated normally.
Q
How to increase Logging Level in KCC? What are it's merits &
demerits ?
A
The KCC, like all subsystems in Active Directory, has a variable
event logging level. By default, only the most important events are
logged. You can increase the level of detail in the event log by
modifying the value in the Replication
Events entry
in
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\NTDS\Diagnostics
in the registry.
Increasing
the level of detail can be used to better understand the behavior of
the KCC in different situations. However, a logging level value of
greater than 2 generally results in excessive logging that degrades
the performance of the component. Increasing the logging level can be
useful for troubleshooting problems, but it is not recommended for
normal operation
Q
Intervals at whic KCC runs ?
A
* 5 mins after the domain Controller starts: By default, the KCC runs
its first replication topology check five minutes after the domain
controller starts. This interval can be modified by changing the Repl
topology update delay (secs) entry
in
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\NTDS\Parameters
as follows:
Value:
Number of seconds to wait between the time Active Directory starts
and the KCC runs for the first time.
Default:
300 seconds (5 minutes)
Data
type: REG_DWORD
*
services are running, the KCC checks the topology every 15 minutes
: By default, as long as services are running, the KCC checks the
topology every 15 minutes and makes changes as necessary. The
administrator can modify the interval at which the KCC performs this
review by changing the Repl
topology update period (secs) entry
in
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\NTDS\Parameters
as follows:
Value:
Number of seconds between KCC topology updates
Default:
900 seconds (15 minutes)
Data
type: REG_DWORD
Q What
happen if Current ISTG becomes unavailable ?
A If the
current ISTG becomes unavailable for 60 minutes, an election is held
by the other DCs in the site to appoint a new ISTG. This can
sometimes cause problems for Active Directory replication
Q Default time for ISTG to establish new connection automatically between 2 sites if Primary ISTG server of either site fails ?
A 60 min
Q Mandatory Requirement for ISTG to be transferred to another server?
A It
should be ADC(Additional Domain Controller)
Q To transfer ISTG role frm DC to other other Servers ?
A Open
ADSIEDIT.msc
-
Expand Configuration [DomainController].
-
Expand CN=Configuration,DC=<domain>,DC=<com>.
-
Expand CN=Sites.
-
Highlight CN=<sitename> for the site where you want to change the ISTG Server.
-
In the details pane, right-click on CN=NTDS Site Settings and select Properties.
-
Locate the interSiteTopologyGenerator attribute and you will see which Domain Controller is designated as the ISTG server.
-
To change the server, click Edit and then change the server name
Q To
verify the replication ?
A
repadmin /showrepl <servername> /u:<domainname>\<username>
/pw:*
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