Software-defined networking: Difference between revisions

Revision as of 18:42, 19 July 2024

Revision as of 16:25, 19 August 2024

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* 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.

* 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.<ref>{{Cite journal|last1=Montazerolghaem|first1=Ahmadreza|last2=Yaghmaee|first2=Mohammad Hossein|last3=Leon-Garcia|first3=Alberto|date=September 2020|title=Green Cloud Multimedia Networking: NFV/SDN Based Energy-Efficient Resource Allocation|url=https://ieeexplore.ieee.org/document/9044834|journal=IEEE Transactions on Green Communications and Networking|volume=4|issue=3|pages=873–889|doi=10.1109/TGCN.2020.2982821|s2cid=216188024|issn=2473-2400}}</ref>

* 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.<!--[[User:Kvng/RTH]]-->

==New network architecture==

The explosion of mobile devices and content, server virtualization, and the advent of cloud services are among the trends driving the networking industry to re-examine traditional network architectures.<ref>{{cite web|url=http://www.opennetworking.org/sdn-resources/sdn-library/whitepapers|title=White Papers|website=Opennetworking.org|access-date=26 October 2014}}</ref> 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 ismay be ill-suited to the dynamic computing and storage needs of today's enterprise data centers, campuses, and carrier environments.<ref>{{Cite journal|last1=Montazerolghaem|first1=Ahmadreza.|last2=Yaghmaee|first2=M. H.|last3=Leon-Garcia|first3=A.|date=2017|title=OpenSIP: Toward Software-Defined SIP Networking|journal=IEEE Transactions on Network and Service Management|volume=PP|issue=99|pages=184–199|doi=10.1109/tnsm.2017.2741258|issn=1932-4537|arxiv=1709.01320|bibcode=2017arXiv170901320M|s2cid=3873601}}</ref> Some of the key computing trends driving the need for a new network paradigm include:

; Changing traffic patterns

: Within the enterprise data center, traffic patterns have changed significantly. In contrast to client-server applications where the bulk of the communication occurs between one client and one server, today's applications access different databases and servers, creating a flurry of "[[East-west traffic|east-west" machine-to-machine traffic]] before returning data to the end user device in the classic "[[north-south" traffic]] pattern. At the same time, users are changing network traffic patterns as they push for access to corporate content and applications from any type of device (including their own), connecting from anywhere, at any time. Finally, many enterprise data centerscenter managers are contemplatingdeploying a utility computing model, which mightmay include a private cloud, public cloud, or some mix of both, resulting in additional traffic across the wide -area network.<!--[[User:Kvng/RTH]]-->

; The "consumerization of IT"