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Well MSE-dwells is right. There is no way to do it directly except adding new sites; but that means changing your AD topology. Anyway, this article may help you.( It's about not forcing a client but forcing a dc to accept logons)<br />
<a href="http://www.jsifaq.com/SF/Tips/Tip.aspx?id=4527" rel="ugc">http://www.jsifaq.com/SF/Tips/Tip.aspx?id=4527</a>
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Well MSE-dwells is right. There is no way to do it directly except adding new sites; but that means changing your AD topology. Anyway, this article may help you.( It's about not forcing a client but forcing a dc to accept logons)
http://www.jsifaq.com/SF/Tips/Tip.aspx?id=4527 [http://www.jsifaq.com/SF/Tips/Tip.aspx?id=4527]

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Windows 2003 server
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How can I force a client to validate its logon against a specific domain controller?

Windows Server 2003 was based on Windows XP and was released in four editions: Web, Standard, Enterprise and Datacenter. It also had derivative versions for clusters, storage and Microsoft’s Small Business Server. Important upgrades included integrating Internet Information Services (IIS), improvements to Active Directory (AD) and Group Policy (GP), and the migration to Automated System Recovery (ASR).

Windows Server 2003

Active Directory (AD) is a Microsoft brand for identity-related capabilities. In the on-premises world, Windows Server AD provides a set of identity capabilities and services, and is hugely popular (88% of Fortune 1000 and 95% of enterprises use AD). This topic includes all things Active Directory including DNS, Group Policy, DFS, troubleshooting, ADFS, and all other topics under the Microsoft AD and identity umbrella.

Active Directory

Windows 2000 is an operating system for use on both client and server computers. It is the successor to Windows NT 4.0, and is the last version of Microsoft Windows to display the "Windows NT" designation. Four editions of Windows 2000 were released (Professional, Server, Advanced Server, and Datacenter Server) that shared a core set of features, including many system utilities such as the Microsoft Management Console. All versions of the operating system support NTFS 3.0, Encrypting File System, as well as basic and dynamic disk storage. The Windows 2000 Server family includes support for Active Directory services, Distributed File System and fault-redundant storage volumes.