Network function virtualization is an emerging technology that is changing the paradigm of operations within the telco industry. Associated with the virtualization benefits it also appear a growing complexity to manage and operate complex and dynamic scenarios.
In a traditional network all the elements are physical and so they are limited and very rigid. You may have N and only N elements and it is not easy, neither cheap and neither fast, to either increase or decrease that number.
In an NFV world you got one additional layer as the “physical elements” become virtual and run as software on top of one or more servers as a set of virtual machines (typically more than one) and on top of that those “physical elements” can “breath“ scaling in or out and increasing or decreasing over time the number of VMs assigned to perform the same function so operations over them has no longer a fix limit but a variable over time and context limit.
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Aldama, Ignacio; Sevilla Giron, Ruben; and GarcÃa Lopez, Javier, "NFV Dynamic and Adaptative Contextual Execution", Technical Disclosure Commons, (May 17, 2017)