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Windows Server 2012 : Enhancing DHCP Reliability - Windows Server 2012 DHCP Failover

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12/8/2014 8:45:42 PM

Windows Server 2012 DHCP includes a failover scope feature. The benefit of this feature is that leases and reservations are synchronized across the DHCP server and a failover cluster is not required. The two different types of failover scopes are a load-balance and hot-standby failover scope. To deploy a failover scope, follow these steps.

1. Install the DHCP server service on at least two DHCP servers and authorize them both.

2. Log on to the primary DHCP server and open the console. Expand the IPv4 node and create the desired scope .

3. Once the scope is created, right-click the scope in the tree pane and select Configure Failover. The DHCP Configure Failover Wizard opens.

4. On the Introduction page, leave the check box to apply failover to all scopes or uncheck the box and select the desired scopes and click Next to continue.

5. On the next page, type in the name of the partner server for failover and click Next to continue.

6. On the Create a New Failover Relationship page, accept the default name for the failover relationship and configure the desired failover configurations as shown in Figure 1. This example configures a 50/50 split-scope load-balanced configuration. This example also uses message authentication, and we enter a shared secret password that must be documented. Click Next to continue.

Image

Figure 1. Defining the failover relationship settings.

7. On the final page, confirm the configurations. If all the settings look correct, click Finish to create the failover scope.

8. A pop-up window opens to detail the status of the configuration. When the configuration completes successfully, click Close to finish the process.

This completes the failover scope configuration task

DHCP Failover Cluster Servers

You can deploy DHCP services on a Windows Server 2012 failover cluster. With this type of DHCP deployment, there is only a single DHCP server database, and configuration is not replicated across servers. Instead, the DHCP data is accessed by one server at a time, and when a software or hardware issue is encountered, the DHCP services are moved to another failover cluster host. Deploying services on failover clusters has its own challenges but can prove to be simpler for a DHCP server deployment if the server and storage hardware meets all the failover cluster requirements.

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