Modify the Primary and Secondary servers and failover mode of an existing Windows
DHCP failover relationship (you cannot edit the name of an existing Windows DHCP failover
relationship). Changing the Primary and Secondary servers will also update the associated
DHCP Deployment Role.
Note: STOP! Before you edit a Windows DHCP failover relationshipModifying
an existing Windows DHCP failover relationship can impact multiple objects
that are attached to this relationship, both in Address Manager and in your
Windows DHCP configuration. BlueCat advises customers to use caution before
modifying any parameters of an existing Windows DHCP failover
relationship.
Any changes to an existing Windows DHCP failover
relationship will be recorded in the Audit Log and the Transaction
Log.
To edit a Windows DHCP failover relationship:
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Select the My IPAM tab. From the configuration drop-down
menu, select a configuration.
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Select the Servers tab. Tabs remember the page you last
worked on, so select the Servers tab again to ensure you
are working with the Configuration information page.
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Under Windows DHCP Failover Relationships, click the
name of a Windows DHCP failover relationship. The Windows DHCP
Failover Relationship details page opens.
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Click the Relationship name menu and click Edit.
The Edit Windows DHCP Failover Relationship page opens.
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To modify the Primary Server, click
Remove to delete the existing server, then click
Select. The Select Server Interface pop-up window
opens.
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Under Servers, click the server you wish to use
as the Primary.
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Under Server Interfaces, select the primary
server interface and click Add. If
necessary, click Up to return to the list of
servers.
The selected server and its IP address appear on the Edit
Windows DHCP Failover Relationship page. If necessary,
click Remove to delete the server and start
again.
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To modify the Secondary Server, click
Remove to delete the existing server, then click
Select. The Select Server
Interface pop-up window opens.
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Under Servers, click the server you wish to use
as the Secondary.
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Under Server Interfaces, select the secondary
server interface and click Add. If
necessary, click Up to return to the list of
servers.
The selected server and its IP address appear on the Edit
Windows DHCP Failover Relationship page. If necessary,
click Remove to delete the server and start
again.
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In the Max Client Lead Time field, enter a unit of time
then select either Seconds, Minutes, Hours or Days
from drop-down menu (by default, 1 hour). The MCLT is the maximum time
that one server can extend a lease for a DHCP client beyond the time known by
the partner server.
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From the Failover Mode drop-down menu select either
Load Balance or Hot Standby (by default, Load Balance).
Available options will change depending on your selection:
- Hot Standby Percentage—enter the Hot Standby
percentage for the Primary Server in the text field (by default,
95:5). Address Manager will automatically calculate the
percentage for the Secondary Server.
- Load Balance Percentage—enter the load balance
percentage for the Primary Server in the text field (by default,
50:50). Address Manager will automatically calculate the
percentage for the Secondary Server.
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OPTIONAL: BlueCat strongly recommends that customers do not use
Automated State Switchover and the option is deselected by default. However, if
modifying the option is necessary, select the State Switchover
Interval check box, enter a time interval in the text field,
then select either Seconds, Minutes, Hours, or Days
from the drop-down menu (by default, 1 hour).
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OPTIONAL: By default, Shared Secret is
deselected. However, if you want to enable authentication between the two
Windows Servers, select the check box and enter the shared secret in the text
field. The text will remain hidden like a password.
The default Shared Secret is blank, meaning that no authentication is
enabled.
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Under Change Control, add comments to describe your
changes. By default, this step is optional but might be set as a
requirement.
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Click Update.