DHCP Server Migration Guide

Artikel
07/02/2012

Applies To: Windows Server 2008 R2

Server role migration to an x64-based destination server involves moving the existing settings for the Dynamic Host Configuration Protocol (DHCP) server, the server that lets client computers that are connected to a network acquire IP addresses dynamically. The goal of this server migration is to install the DHCP server role on the Windows Server® 2008 R2 operating system so that it serves IP addresses on a network without any perceptible change to client computers in the domain.

About this guide

This guide describes the steps for migrating existing DHCP server settings to a server that is running Windows Server 2008 R2. Migration documentation and tools ease the migration of server role settings and data from an existing server to a destination server that is running Windows Server 2008 R2. By using the tools that are described in this guide to migrate a DHCP server, you can simplify migration, reduce migration time, increase the accuracy of the migration process, and help eliminate possible conflicts that might otherwise occur during DHCP migration. For more information about the migration tools, see DHCP Server Migration: Appendix A.

Target audience

This guide is intended for information technology (IT) administrators, IT professionals, and other knowledge workers who are responsible for the operation and deployment of DHCP servers in a managed environment.

What this guide does not provide

The following scenarios are not supported or are beyond the scope of this guide.

Clustering scenarios are not supported by this migration process. For more information about migrating DHCP Server in a cluster environment, see Migrating DHCP to a Cluster Running Windows Server 2008 R2 Step-by-Step Guide (https://go.microsoft.com/fwlink/?LinkId=140512) on the Windows Server TechCenter.
Upgrading roles on the same computer is out of scope for this guide.
Scenarios in which the new operating system is installed on existing server hardware by using the Upgrade option during setup (in-place upgrades) are not covered in this guide.
Migrating more than one server role is not covered in this guide.

Supported migration scenarios

This guide gives you the instructions for migrating an existing DHCP server to a server that is running Windows Server 2008 R2. This guide does not contain instructions for migration when the source server is running multiple roles. If your server is running multiple roles, we recommend that you design a custom migration procedure specific to your server environment based on the information provided in other role migration guides. Migration guides for additional roles are available on the Windows Server 2008 R2 TechCenter (https://go.microsoft.com/fwlink/?LinkID=128554).

Warning

If the source server is running multiple roles, some migration steps in this guide, such as those for computer name and IP configuration, can cause other roles that are running on the source server to fail.

This guide provides instructions only for migrating DHCP data and settings from a server that is being replaced by an x64-based server running Windows Server 2008 R2.

Supported operating systems

This guide provides instructions for migration of a DHCP server from a server that is running Windows Server 2003 or Windows Server 2008 to a server running Windows Server 2008 R2. Supported operating systems are listed in the following table.

Supported operating systems for migration

Source server processor	Source server operating system	Destination server operating system	Destination server processor
x86- or x64-based	Windows Server 2003 with Service Pack 2	Windows Server 2008 R2, both full and Server Core installation options	x64-based
x86- or x64-based	Windows Server 2003 R2	Windows Server 2008 R2, both full and Server Core installation options	x64-based
x86- or x64-based	Windows Server 2008	Windows Server 2008 R2, both full and Server Core installation options	x64-based
x64-based	Windows Server 2008 R2	Windows Server 2008 R2, both full and Server Core installation options	x64-based
x64-based	Server Core installation option of Windows Server 2008 R2	Windows Server 2008 R2, both full and Server Core installation options	x64-based

The versions of operating systems shown in the previous table are the oldest combinations of operating systems and service packs that are supported. Newer service packs, if available, are supported for the migration of DHCP server settings.

Foundation, Standard, Enterprise, and Datacenter editions of Windows Server are supported as either source or destination servers.

Migrations between physical operating systems and virtual operating systems are supported.

Migration from a source server to a destination server that is running an operating system in a different system user interface (UI) language than the source server is not supported. The system UI language is the language of the localized installation package that was used to set up the Windows operating system. For example, you cannot use Windows Server migration tools to migrate roles, operating system settings, data, or shares from a computer that is running Windows Server 2008 in the French system UI language to a computer that is running Windows Server 2008 R2 in the German system UI language.

Both x86-based and x64-based migrations are supported for Windows Server 2003 and Windows Server 2008. All editions of Windows Server 2008 R2 are x64-based.

Roles that are running on Server Core installations of Windows Server 2008 cannot be migrated, because there is no .NET Framework available on Server Core installations of Windows Server 2008.

We recommend migration rather than an upgrade even when the hardware is native x64-based. For example, with a server role split, a scenario in which the source server has more than one server role, because of increased use of this server you might decide to separate the roles onto several additional x64-based servers. In this case, migrating (not upgrading) individual server roles to other servers may be the best solution.

The server administrator can choose which components of an existing installation to migrate; together with the server role, these components usually include configuration, data, system identity, and operating system settings.

Supported role configurations

You can migrate all DHCP Server settings by using this guide, including registry and database settings.

Note

If you are migrating a DHCP server in a cluster configuration, see Migrating DHCP to a Cluster Running Windows Server 2008 R2 Step-by-Step Guide (https://go.microsoft.com/fwlink/?LinkId=140512) on the Windows Server TechCenter.

DHCP Server migration overview

DHCP Server migration is divided into the following major sections:

DHCP Server migration process

As shown in the following illustration, the pre-migration process involves the manual collection of data, followed by procedures on the destination and source servers. The migration process includes source and destination server procedures that use the Export and Import cmdlets to automatically collect, store, and then migrate server role settings. Post-migration procedures include verifying that the destination server successfully replaced the source server and then retiring or repurposing the source server. If the verification procedure indicates that the migration failed, troubleshooting begins. If troubleshooting fails, rollback instructions are provided to return to the use of the original source server.

Impact of migration on other computers in the enterprise

During migration, the source DHCP server might not be available. Therefore, client computers will not be able to obtain IP addresses from this DHCP server. We recommend that you maintain or create an auxiliary DHCP server so that client computers can obtain IP addresses while you migrate the primary DHCP server.

Be aware that if you choose to perform the migration without any auxiliary DHCP servers, all clients with valid leases must keep using those leases. If a lease for an existing client expires, that client will not be able to obtain an IP address. In addition, any new client that connects to the network will not be able to obtain an IP address when the single-source DHCP server is not available.

Permissions required to complete migration

The following permissions are required on the source server and the destination server:

Domain administrative rights that are required to authorize DHCP Server.
Local administrative rights are required to install or manage DHCP Server.
Write permissions are required to the migration store location. For more information, see DHCP Server Migration: Preparing to Migrate.

Estimated duration

The migration can take two to three hours, including testing.

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