Book Image

Learning VMware vSphere

By : Rebecca Fitzhugh, Abhilash G B
Book Image

Learning VMware vSphere

By: Rebecca Fitzhugh, Abhilash G B

Overview of this book

Computer virtualization is a method to enable the running of multiple application workloads on a machine to achieve efficient utilization and reduce the number of physical machines in a data center. This has now become the foundation of many modern day data centers. What began as a technology to virtualize x86 architecture has now grown beyond the limits of a server’s hardware and into the realm of storage and network virtualization. VMware is currently the market leader in developing data center virtualization solutions. This book goes into the details of designing and implementing VMware solutions that form the foundation of a VMware infrastructure. The book begins by introducing you to the concepts of server virtualization followed by the architecture of VMware’s hypervisor – ESXi and then by its installation and configuration. You then learn what is required to manage a vSphere environment and configure advanced management capabilities of vCenter. Next you are taken through topics on vSphere Networking, Storage, ESXi Clustering, Resource Management and Virtual Machine Management. You will then be introduced to SSL Certificate Management and its use in a vSphere environment. Finally, you will learn about the lifecycle management of a vSphere environment by effectively monitoring, patching and upgrading vSphere components using Update Manager. By the end of the book, you will know how to use VMware’s vSphere suite of components to lay the foundation of a modern day virtual infrastructure.
Table of Contents (18 chapters)
Learning VMware vSphere
Credits
About the Authors
About the Reviewers
www.PacktPub.com
Preface

The difference between a physical and virtual switch


Now that we understand the need for a virtual switch, it is essential to understand how different a virtual switch is when compared to a physical switch. The fact that VMware calls it a virtual switch is indicative of the fact that it can switch frames between its virtual ports or physical uplinks. So, is it any different from a physical switch? The answer is yes, in a couple of ways. One of the differences is the manner in which the virtual switch handles frame transfers:

When a frame enters a physical switch, its destination is determined by the switch port number corresponding to its destination MAC address in the physical switch's MAC table. If it can't find an entry in the MAC table, it floods the frame out via every port other than the source port. Much like the physical switch, a virtual switch also maintains a MAC table, but there is no learning process for a virtual switch. A virtual switch will already have a list of MAC addresses...