Microsoft Corporation - Microsoft System Center: Network Virtualization and Cloud Computing

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Copyright 2014 by Microsoft Corporation (All)

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Library of Congress Control Number: 2013952566
ISBN: 978-0-7356-8306-8

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A s businesses move more toward cloud computing, one important factor for success is adopting multi-tenant software-defined networking (SDN) solutions in data centers. Hyper-V Network Virtualization (HNV) is a key enabler for a multi-tenant SDN solution and is essential for implementing a hybrid cloud environment where tenants can bring not only their own IPs, but their entire network topology since the virtualized networks are abstracted from the underlying fabric network. Network virtualization in general and Hyper-V Network Virtualization in particular are relatively new concepts. Unlike server virtualization, which is a mature, widely-understood technology, network virtualization still lacks this kind of broad familiarity.

This brief book identifies some key usage and deployment scenarios for cloud computing to provide some deep technical background on the Microsoft SDN solution, enabling IT professionals to quickly learn the internals of HNV, how it works from end to end, and where and how it should be used.

The authors would like to thank the following individuals for their assistance during our work on this title:

Amit Kumar, Senior SDET, Windows Azure Networking

Charley Wen, Program Manager, Windows Core Networking

Luis Martinez Castillo, Senior SDET, Windows Core Networking

Praveen Balasubramanian, Senior SDE, Windows Core Networking

Ramandeep Singh Dhillon, Program Manager Windows Server Networking

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N etwork virtualization in general and Hyper-V Network Virtualization specifically are relatively new concepts. Unlike server virtualization, which is a mature technology that is widely understood, network virtualization lacks this same broad understanding. The first section of this chapter walks through key concepts in Hyper-V Network Virtualization and the benefits it provides. The later section of this chapter covers how to set up a basic virtual network and connects the key concepts to the implementation.

Server virtualization is a well-known concept by which many virtual servers can run on a single physical server with the appearance of running on a dedicated physical server. Typically, a hypervisor provides an abstraction of physical resources (CPU, memory, storage, and local networking) allowing for this illusion. The benefits of server virtualization are also well known and, among others, include:

Isolation (performance and security) between virtual servers

More efficient use of physical resources

Easier movement of workloads across physical servers

Network virtualization, from a high level, has the same goals when it comes to the network fabric that connects virtual servers. Network virtualization should allow a virtual network, including all of its IP addresses, routes, network appliances, and so on, to appear to be running directly on the physical network. This allows the servers connected to that virtual network to continue to operate as if they were running directly on the physical network even as multiple virtual networks share the physical network. This concept of virtual networks allows the network to gain many of the same benefits that server virtualization provided to servers. shows conceptually how network virtualization and server virtualization are the same.

FIGURE 1-1 Network virtualization is conceptually the same as server virtualization.