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The Benefits of Deploying a Virtualized CDN

This Blog has been written by Bruno D’Avanzo—Content Delivery Solutions Program Manager


From my perspective the Network Functions Virtualization (NFV) is a technology that can virtualize entire classes of network node function into building blocks that may be connected, or chained, together to create communication services.

The feedback I got from the customers who chose this technology is that the NFV infrastructure is cost efficiency and scalability for running elastic services with the ability to dynamically adjust to the end users demand. NFV infrastructures can be built out of existing deployments and are proficient of helping future progresses which makes it a sensible investment. And the last and not least benefit is that NFV is vastly flexible and elastic because it can grow or shrink automatically based on demand. NFV controls and synchronizes resource usage across different Virtual Network Functions (VNFs) when scaling in or out. This will be helpful to manage multiple aspects of the process simply by using intuitive tools that will offer relevant data to comprehend the scaling of the NFVs.


So, do not hesitate to take the advantage of the Virtual CDN made of Traditional CDN and more!


My personal experience of this solution is that the Virtual CDN (vCDN) have all the functionality of the Traditional CDNs, but thanks to the NFV architecture, they reduce cost and increase elasticity. vCDN can grow or shrink dynamically to fulfill end-users’ demand. Multiple vCDN technologies can coexist and run in similar NFV infrastructure making it possible for content to “bring with it” its own preferred CDN technology without conflicts.


It is essential to keep in mind the major benefits for Telco and TV industries of the vCDN:

  • Cost model enabling the next order-of-magnitude increase in Scale, supporting the shift from traditional TV to OTT TV.

  • vCDN as a building block for complete TV Services together with TV Middleware, nPVR, Video Analytics, and CMS.

  • Elasticity. CDN can grow or shrink dynamically to fulfil end-users' demand

  • Diverisity. Multiple vCDN technologies can coexist and run in the same NFV infrastructure. Each content offering can bring its own CDN technology with it without conflicts.





As a valuable demonstration, HP Speedvideo CDN & the NFV Director combining together the benefits of vCDN and the NFV Orchestration.


HP Speed Video CDN is a distributed infrastructure that scales with the customer needs. HP SpeedVideo is a software based service that runs over virtualized environments and with the help of NFV, it becomes an elastic content delivery solution, are of the actual end users’ demand and network conditions.


To describe it, with a technical perspective, NFV Director manages service configuration to adapt resources to requested loads and automatically manages the resource allocation and availability. The NFV Director will manage the cloud and NFV depending on the traffic being generated by the customer needs. It makes certain tasks automatic to give enhanced optimization of the network without manually keeping track of the scaling of the network. NFV Director is clever to understand when the network is being used with normal usage, but when the network reaches a point where it’s getting substantial traffic it will than use additional VNF inventory to keep up with demand.


As a proof of it, Hewlett-Packard has already implemented a vCDN prototype showcased at MWC 2014, and is working on the release of a vCDN 1.0 version to be released in summer.


As the expert on the subject, I can share with you my conclusions drawn from the implementation of the prototype and the WIP development of vCDN 1.0:

      • This integration with NFV Control Layer (HP NFV Director) is very fast!

      • No significant drop in efficiency, especially for Linear Channels in typical scenarios

      • The NFV infrastructure can be built by leveraging HW deployed for previous Physical CDN Solutions

      • Using small servers with locally attached disks can result in very good efficiency while at the same time supporting other type of VNFs

      • Evolution of CDN SW towards cooperative distributed caching will bring significant benefits

You can learn more on this solution for media by sharing the output of the Content Delivery Summit held in New York the 12th of May.


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