Intel Software Adrenaline

Simplified Networking Based on SDN and NFV

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Part I: SDN and NFV SDN Objectives The explosion of mobile devices and video content, server virtualization and the advent of cloud services are some of the trends driving the networking industry to reexamine traditional network architectures, according to the Open Networking Foundation (ONF).2 The ONF is a non-profit consortium of more than 80 companies dedicated to the transformation of networking through the development and standardization of SDN. The consortium points out that many conventional networks are hierarchical, built with tiers of Ethernet switches arranged in a tree structure. This design made sense when client-server computing was dominant, but such a static architecture is ill-suited to the dynamic computing and storage needs of today's enterprise data centers, campuses and carrier environments. SDN is an approach to building networks that accomplishes the following: • Separates the control and data planes How is SDN expected to impact network architecture? First, consider the simple representation of traditional networking on the left side of Figure 1, where vertically-integrated boxes supporting vendor-specific applications and services are located throughout the network. One downside is network intelligence is distributed, making the configuration and management of network elements rather arduous. When deploying new services today, network operators generally add fixed-function, packet processing appliances, creating a network that is difficult to power manage, costly to scale and cumbersome to expand. The right side of Figure 1 shows an SDN implementation that separates the control and data planes. Network intelligence is centralized in software-based SDN controllers that have a global view of the network. As a result, the network can be more easily programmed by external applications, and network administrators can shape traffic from centralized control consoles without having to configure individual switches.3 • Provides a global view of the network to a centralized controller • Enables external applications to program the network Traditional Networking SDN Network Intelligence Network Intelligence OS OS Network Intelligence OS API Switch Silicon API Network Intelligence Switch Silicon Switch Silicon API Network Intelligence OS API OS API API Switch Silicon Switch Silicon Switch Silicon API API Switch Silicon Switch Silicon Figure 1. An example of SDN transforming the network 2

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