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Big data - Concept and application for telecommunications                       5


            1       Scope

            This  Recommendation  defines  the  functional  architecture  of  software-defined  networking  (SDN)  by
            describing a layered architecture, the functional components of the architecture and its reference points.
            Details of multi-layer management are provided in Annex A and the role of orchestration is addressed in
            Appendix I. The architecture is based on [ITU-T Y.3300] which defines the SDN framework and [ITU-T Y.3301]
            which describes the functional requirements of the SDN architecture which the present Recommendation
            has to fulfil.


            2       References

            The following ITU-T Recommendations and other references contain provisions which, through reference in
            this text, constitute provisions of this Recommendation. At the time of publication, the editions indicated
            were valid. All Recommendations and other references are subject to revision; users of this Recommendation
            are  therefore  encouraged  to  investigate  the  possibility  of  applying  the  most  recent  edition  of  the
            Recommendations and other references listed below. A list of the currently valid ITU-T Recommendations is
            regularly published. The reference to a document within this Recommendation does not give it, as a stand-
            alone document, the status of a Recommendation.
            [ITU-T M.3400]  Recommendation ITU-T M.3400 (2000), TMN management functions.

            [ITU-T Y.3001]      Recommendation ITU-T Y.3001 (2011), Future networks: Objectives and design goals.
            [ITU-T Y.3300]      Recommendation ITU-T Y.3300 (2014), Framework of software-defined networking.

            [ITU-T Y.3301]      Recommendation ITU-T Y.3301 (2016), Functional requirements of software-defined
                                networking.

            [ITU-T Y.3320]      Recommendation ITU-T Y.3320 (2014), Requirements for applying formal methods to
                                software-defined networking.


            3       Definitions


            3.1     Terms defined elsewhere
            This Recommendation uses the following terms defined elsewhere:

            3.1.1   functional component [b-ITU-T Y.3502]: A functional building block needed to engage in an activity,
            backed by an implementation.

            3.1.2   network virtualization [b-ITU-T Y.3011]: A technology that enables the creation of logically isolated
            network  partitions  over  shared  physical  networks  so  that  heterogeneous  collection  of  multiple  virtual
            networks can simultaneously coexist over the shared networks. This includes the aggregation of multiple
            resources in a provider and appearing as a single resource.
            3.1.3   software-defined networking [ITU-T Y.3300]: A set of techniques that enables to directly program,
            orchestrate, control and manage network resources, which facilitates the design, delivery and operation of
            network services in a dynamic and scalable manner.

            3.2     Terms defined in this Recommendation
            This Recommendation defines the following term:

            3.2.1   SDN  orchestration:  A  process  that  oversees  and  directs  a  set  of  software-defined  networking
            activities and interactions with the objective of carrying out certain work in an automated manner.
            NOTE  –  In  SDN,  orchestration  can  be  used  to  arrange,  configure  and  coordinate  a  set  of  operations  in
            multi-domain, multi-layer or end-to-end heterogeneous networking environments in order to execute a specific
            task.





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