SDN
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Software-defined networking (SDN) is an emerging network architecture that decouples the network control and forwarding functions. This allows the network control to become directly programmable through software. SDN provides agility, centralized management, and programmable configuration of network resources. It addresses the limitations of current static networks that cannot adapt to the dynamic computing and storage needs of modern data centers and cloud environments with changing traffic patterns and massive datasets.
SDN
- 1. N I H A R A I S H W A R Y A S H R E E J I A A Y U S H I A B H A Y Software-Defined Networking
- 2. What is SDN? Software defined networking (SDN) is an approach to using open protocols, such as OpenFlow, to apply globally aware software control at the edges of the network to access network switches and routers that typically would use closed and proprietary firmware.
- 3. In trying to meet the networking requirements posed by evolving computing trends, network designers find themselves constrained by the limitations of current networks.
- 4. The limitations of current networks Complexity that leads to stasis: • Adding or moving devices and implementing network- wide policies are complex • time-consuming, and primarily manual endeavors that risk service disruption, discouraging network changes. Inability to scale: The time-honored approach of link oversubscription to provision scalability is not effective with the dynamic traffic patterns in virtualized networks—a problem that is even more pronounced in service provider networks with large-scale parallel processing algorithms and associated datasets across an entire computing pool.
- 5. Vendor dependence: Lengthy vendor equipment product cycles and a lack of standard, open interfaces limit the ability of network operators to tailor the network to their individual environments.
- 6. Software-Defined Networking (SDN) is an emerging architecture that is dynamic, manageable, cost-effective, and adaptable, making it ideal for the high-bandwidth, dynamic nature of today's applications. This architecture decouples the network control and forwarding functions enabling the network control to become directly programmable and the underlying infrastructure to be abstracted for applications and network services.
- 7. The SDN architecture is: •Directly programmable: Network control is directly programmable because it is decoupled from forwarding functions. Agile: Abstracting control from forwarding lets administrators dynamically adjust network-wide traffic flow to meet changing needs.
- 8. Centrally managed: Network intelligence is (logically) centralized in software-based SDN controllers that maintain a global view of the network, which appears to applications and policy engines as a single, logical switch.
- 10. Programmatically configured: SDN lets network managers configure, manage, secure, and optimize network resources very quickly via dynamic, automated SDN programs, which they can write themselves because the programs do not depend on proprietary software. Open standards-based and vendor-neutral: When implemented through open standards, SDN simplifies network design and operation because instructions are provided by SDN controllers instead of multiple, vendor-specific devices and protocols.
- 11. Computing Trends are Driving Network Change SDN addresses the fact that the static architecture of conventional networks is ill-suited to the dynamic computing and storage needs of today’s data centers, campuses, and carrier environments. The key computing trends driving the need for a new network paradigm include:
- 12. Changing traffic patterns: Applications that commonly access geographically distributed databases and servers through public and private clouds require extremely flexible traffic management and access to bandwidth on demand. The “consumerization of IT”: The Bring Your Own Device (BYOD) trend requires networks that are both flexible and secure.
- 13. The rise of cloud services: Users expect on- demand access to applications, infrastructure, and other IT resources. “Big data” means more bandwidth: Handling today’s mega datasets requires massive parallel processing that is fueling a constant demand for additional capacity and any-to-any connectivity.
- 14. Current status of SDN Hardware support 14 Ciena Coredirector NEC IP8800 Morecomingsoon... Juniper MX-series HP Procurve5400 Pronto3240/3290 WiMax (NEC) PCEnginesNetgear 7324
Editor's Notes
- #15: Not only switches but other network components