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Versions: (draft-lee-teas-actn-requirements) 00 01 02 03 04 05 06 07 09

TEAS Working Group                                   Young Lee (Editor)
Internet Draft                                                   Huawei
Intended status: Informational
                                                     Daniele Ceccarelli
Expires September 1, 2018.                                     Ericsson

                                                        Takuya Miyasaka
                                                                   KDDI

                                                         Jong Yoon Shin
                                                                    SKT

                                                         Kwang-koog Lee
                                                                     KT



                                                          March 1, 2018



        Requirements for Abstraction and Control of TE Networks

                   draft-ietf-teas-actn-requirements-09


Abstract

   This document provides a set of functional requirements for
   abstraction and control of Traffic Engineering networks to
   facilitate virtual network operation via the creation of a single
   virtualized network or a seamless service. This supports operators
   in viewing and controlling different domains (at any dimension:
   applied technology, administrative zones, or vendor-specific
   technology islands) as a single virtualized network.



Status of this Memo

   This Internet-Draft is submitted to IETF in full conformance with
   the provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF), its areas, and its working groups.  Note that
   other groups may also distribute working documents as Internet-
   Drafts.





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   Copyright (c) 2018 IETF Trust and the persons identified as the
   document authors. All rights reserved.

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Table of Contents


   1. Introduction...................................................3
      1.1. Requirements Language.....................................4
   2. High-level ACTN requirements...................................4
      2.1. Service-Specific Requirements.............................5
      2.2. Network-Related Requirements..............................7
   3. Security Considerations........................................9
   4. IANA Considerations............................................9
   5. References....................................................10
      5.1. Normative References.....................................10
      5.2. Informative References...................................10
   6. Contributors..................................................11
   Authors' Addresses...............................................12





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1. Introduction

   This document provides a set of functional requirements for
   Abstraction and Control of Traffic Engineering (TE) Networks (ACTN)
   identified in various use-cases specified by the operators. [ACTN-
   Frame] defines the base reference architecture and terminology.

   ACTN refers to the set of virtual network service operations needed
   to coordinate, control and manage large-scale multi-domain TE
   networks so as to facilitate network programmability, automation,
   efficient resource sharing, and end-to-end virtual service aware
   connectivity.

   These operations are summarized as follows:

     - Abstraction and coordination of underlying network resources
        independent of how these resources are managed or controlled,
        so that higher-layer entities can dynamically control virtual
        networks based on those resources. Control includes creating,
        modifying, monitoring, and deleting virtual networks.

     - Collation of the identifiers and other attributes of the
        resources from multiple TE networks (multiple technologies,
        equipment from multiple vendors, under the control of multiple
        administrations) through a process of recursive abstraction to
        present a customer with a single virtual network. This is
        achieved by presenting the network domain as an abstracted
        topology to the customer via open and programmable interfaces.
        Recursive abstraction allows for the recursion of abstracted
        data in a hierarchy of controllers.. It is expected that the
        recursion levels should be at least three levels: customer
        level, multi-domain network level, and domain network level.

     - Coordination of end-to-end virtual network services and
        applications via allocation of network resources to meet
        specific service, application and customer requirements. Refer
        to [ACTN-Frame] for the definition of coordination.

     - Adaptation of customer requests (to control virtual resources)
        to the physical network resources performing the necessary
        mapping, translation, isolation and, policy that allows
        conveying, managing and enforcing customer policies with
        respect to the services and the network of the customer.



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     - Provision via a data model and virtual control capability to
        customers who request virtual network services. Note that these
        customers could, themselves, be service providers.

   ACTN solutions will build on, and extend, existing TE constructs and
   TE mechanisms wherever possible and appropriate.  Support for
   controller-based approaches is specifically included in the possible
   solution set.

1.1. Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
   "OPTIONAL" in this document are to be interpreted as described in
   BCP 14 [RFC2119] [RFC8174] when, and only when, they appear in all
   capitals, as shown here.

2. High-level ACTN requirements


   This section provides a summary of use-cases in terms of two
   categories: (i) service-specific requirements; (ii) network-related
   requirements. All these requirements are specified by operators that
   are interested in implementing ACTN.

   Service-specific requirements listed below are uniquely applied to
   the work scope of ACTN. Service-specific requirements are related to
   the virtual service coordination function. These requirements are
   related to customer's Virtual Networks (VN) in terms of service
   policy associated with VNs such as service performance objectives,
   VN endpoint location information for certain required service
   specific functions (e.g., security and others), VN survivability
   requirement, or dynamic service control policy, etc.

   Network-related requirements are related to and necessary for
   coherent/seamless for the virtual network operation function. These
   requirements are related to multi-domain and multi-layer signaling,
   routing, protection/restoration and re-optimization/re-grooming,
   etc.

   Each requirement specified in Sections 2.1 and 2.2 is derived from
   ACTN use-cases: [CHENG], [DHODY], [FANG], [KLEE], [KUMAKI], [LOPEZ],
   [SHIN], [XU], [XU2], and [SUZUKI].





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2.1. Service-Specific Requirements



     1. Requirement 1: Virtual Network Service (VNS) creation

   Customer MUST be able to request/instantiate the VNS to the network
   within the confines of mutual agreement between customer and network
   operator and network operator's capability. A VNS is the service
   agreement between a customer and provider to provide a VN [ACTN-
   Frame]. There are different types of VNS in terms of the VN types
   the customer is allowed to operate (e.g., a VN type can be simply a
   set of edge-to-edge links, or it can comprise of virtual nodes and
   virtual links, etc.). The customer MUST be able to express VNS
   preference that captures Service Level Agreements (SLA) associated
   with virtual network service (e.g., Endpoint selection preference,
   routing preference, time-related preference, etc.)

      Reference: [KLEE], [LOPEZ], [SHIN], [DHODY], [FANG].



     2. Requirement 2: Virtual Network Service Query

   Customer SHOULD be able to request VNS Query ("Can you give me these
   VN(s)?") that include the following parameters:

        - VN type: various VN types defined by the customer (e.g.,
          path, graph, etc.)
        - VN end-points (Customer Edge interface information)
        - VN Topology Service-specific Objective Functions (e.g., a
           set of objective functions as defined in [RFC5541] to be
           supported on the paths, but not limited to).
        - VN constraints requirement (e.g., Maximum Latency threshold,
          Minimum Bandwidth, etc.)

   Reference: [KUMAKI], [FANG], [CHENG].



     3. Requirement 3: VNS Instantiation ("Please create a VNS for me")

   Customer MUST be able to instantiate VNS that includes various VNS
   related parameters:





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        - VN type: various VN types defined by the customer (e.g.,
           Type 1, Type 2, etc. See [ACTN-Frame] for the definition of
           VN Type 1 and Type 2).
        - VN end-points (Customer Edge interface information)
        - VN Topology Service-specific Objective Functions (e.g., a
           set of objective functions as defined in [RFC5541] to be
           supported on the paths, but not limited to).
        - VN constraints requirement (e.g., Maximum Latency threshold,
           Minimum Bandwidth, etc.)
        - VN Topology diversity when there are multiple instances of
           VNS (e.g., VN1 and VN2 must be disjoint; Node/link disjoint
           from other VNs)

   Note that Requirement 3 provides specific details of Requirement 1.

   Reference: [KUMAKI], [FANG], [CHENG].



     4. Requirement 4: VNS Lifecycle Management & Operation (M&O)

   Customer MUST be able to perform the following VNS operations:

        - VNS Delete: Customer MUST be able to delete VNS.
        - VNS Modify: Customer MUST be able to modify VNS related
           parameters during the lifecycle of the instantiated VNS.

   Reference: [FANG], [KUMAKI], [LOPEZ], [DHODY], [FANG], [KLEE].



     5. Requirement 5: VNS Isolation

   Customer's VN should be able to use arbitrary network topology,
   routing, or forwarding functions as well as customized control
   mechanisms independent of the underlying physical network and of
   other coexisting virtual networks. Other customers' VNS operation
   MUST NOT impact a particular customer's VNS network operation.

   Reference: [KUMAKI], [FANG], [LOPEZ]



     6. Requirement 6: Multi-Destination Coordination




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   Customer MUST be able to define and convey service/preference
   requirements for multi-destination applications (e.g., set of
   candidate sources/destinations, thresholds for load balancing,
   disaster recovery preference, etc.)

   Reference: [FANG], [LOPEZ], [SHIN].



     7. Requirement 7: VNS Performance Monitoring

   The customer MUST be able to define performance monitoring
   parameters and its associated preference such as frequency of
   report, abstraction/aggregation level of performance data (e.g., VN
   level, tunnel level, etc.) with dynamic feedback loop from the
   network.

   Reference: [XU], [XU2], [DHODY], [CHENG]



     8. Requirement 8: VNS Confidentiality and Security Requirements

   The following confidentiality/security requirements MUST be
   supported in all interfaces:

      - Securing the request and control of resources, confidentially
        of the information, and availability of function.
      - Trust domain verification between a customer entity and a
        network entity. It verifies if a trust relationship has been
        established between these entities.
      - Encrypting data that flow between components, especially when
        they are implemented at remote nodes, regardless if these are
        external or internal network interfaces.


   Reference: [KUMAKI], [FANG], [LOPEZ]



2.2. Network-Related Requirements

     1. Requirement 1: Virtual Network Service Coordination

   Network MUST be able to support the following VNS operations:




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        - VNS Create: Upon customer's VNS creation request, network
           MUST be able to create VNS within the confines of network
           resource availability.
        - VNS Delete: Upon customer's VNS deletion request, network
           MUST be able to delete VNS.
        - VNS Modify: Upon customer's VNS modification request,
           network MUST be able to modify VNS related parameters during
           the lifecycle of the instantiated VNS.
        - VNS Monitor: Upon customer's VNS performance monitoring
           setup, the network MUST be able to support VNS level
           Operations, Administration and Management (OAM) Monitoring
           under service agreement.

   Reference: [FANG], [KUMAKI], [LOPEZ], [DHODY], [FANG], [KLEE].




     2. Requirement 2: Topology Abstraction Capability

   The network MUST be capable of managing its networks based on the
   principle of topology abstraction to be able to scale multi-layer,
   multi-domain networks.

   Reference: [KLEE], [LOPEZ], [DHODY], [CHENG].



     3. Requirement 3: Multi-Domain & Multi-layer Coordination

   Network coordination for multi-domain and multi-layer path
   computation and path setup operation MUST be provided:

        - End-to-end path computation across multi-domain networks
           (based on abstract topology from each domain)
        - Domain sequence determination
        - Request for path signaling to each domain controller
        - Alternative TE path computation if any of the domain
           controllers cannot find its domain path

   Reference: [CHENG], [DHODY], [KLEE], [LOPEZ], [SHIN], [SUZUKI].



     4. Requirement 4: End-to-End Path Protection




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   End-to-end Path Protection Operations MUST be provided with seamless
   coordination between domain-level protection schemes and cross-
   domain protection schemes.

   Reference: [CHENG], [KLEE], [DHODY], [LOPEZ], [SHIN].



     5. Requirement 5: Dynamicity of virtual network control operations

   Dynamic virtual network control operations MUST be supported. This
   includes, but is not limited to, the following:

        - Real-time VNS control (e.g., fast recovery/reroute upon
           network failure).
        - Fast convergence of abstracted topologies upon changes due
           to failure or reconfiguration across the network domain
           view, the multi-domain network view and the customer view.
        - Large-scale VNS operation (e.g., the ability to process tens
           of thousands of connectivity requests) for time-sensitive
           applications.

   Reference: [SHIN], [XU], [XU2], [KLEE], [KUMAKI], [SUZUKI].



3. Security Considerations

   The ACTN requirements described in this document do not directly
   bear specific security concerns. When these requirements are
   implemented in specific interfaces, securing the request and control
   of resources, confidentially of the information, and availability of
   function, should all be critical security considerations.



4. IANA Considerations

   This document has no actions for IANA.










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5. References

5.1. Normative References

   [ACTN-Frame]   D. Ceccarelli, et al., "Framework for Abstraction and
             Control of Transport Networks", draft-ietf-teas-actn-
             framework, work in progress.



5.2. Informative References

   [RFC2119] S. Bradner, "Key words for use in RFCs to Indicate
             Requirement Levels", RFC 2119, March 1997.

   [RFC5541] JL. Le Roux, JP. Vasseur, and Y. Lee, "Encoding of
             Objective Functions in the Path Computation Element
             Communication Protocol (PCEP)", RFC 5541, June 2009.

   [RFC8174] B. Leiba, "Ambiguity of Uppercase vs Lowercase in RFC 2119
             Key Words", RFC 8174, May 2017.

   [CHENG] W. Cheng, et. al., "ACTN Use-cases for Packet Transport
             Networks in Mobile Backhaul Networks", draft-cheng-actn-
             ptn-requirements-00, July 21, 2014.

   [DHODY] D. Dhody, et. al., "Packet Optical Integration (POI) Use
             Cases for Abstraction and Control of Transport Networks
             (ACTN)", draft-dhody-actn-poi-use-case-07, October 28,
             2016.

   [FANG] L. Fang, "ACTN Use Case for Multi-domain Data Center
             Interconnect", draft-fang-actn-multidomain-dci-01,
             September 29, 2014.

   [KLEE] K. Lee, H. Lee, R. Vilata, V. Lopez, "ACTN Use-case for E2E
             Network Services in Multiple Vendor Domain Transport
             Networks", draft-klee-teas-actn-connectivity-multi-domain-
             03, July 31, 2017.

   [KUMAKI] K. Kumaki, T. Miyasaka, "ACTN : Use case for Multi Tenant
             VNO", draft-kumaki-teas-actn-multitenant-vno-00, May 29,
             2014.

   [LOPEZ] D. Lopez (Ed), "ACTN Use-case for Virtual Network Operation
             for Multiple Domains in a Single Operator Network", draft-
             lopez-actn-vno-multidomains-01, October 27, 2014.


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   [SHIN] J. Shin, R. Hwang, J. Lee, "ACTN Use-case for Mobile Virtual
             Network Operation for Multiple Domains in a Single
             Operator Network", draft-shin-actn-mvno-multi-domain-00,
             June 30, 2014.

   [XU] Y. Xu, et. al., "Use Cases and Requirements of Dynamic Service
             Control based on Performance Monitoring in ACTN
             Architecture", draft-xu-actn-perf-dynamic-service-control-
             03, April 23, 2015.

   [XU2] Y. Xu, et. al., "Requirements of Abstract Alarm Report in ACTN
             architecture", draft-xu-teas-actn-abstract-alarm-report-
             00, July 6, 2015.

   [SUZUKI] T. Suzuki, et. al., "Use-case and Requirements for Multi-
             domain Operation Plane Change", draft-suzuki-teas-actn-
             multidomain-opc-00, July 6, 2015.





6. Contributors



   Dhruv Dhody
   Huawei Technologies
   Email: dhruv.ietf@gmail.com

   Sergio Belotti
   Nokia
   Via Trento, 30
   Vimercate, Italy
   Email: sergio.belotti@nokia.com

   Khuzema Pithewan
   Peloton Technology
   Email: khuzemap@gmail.com

   Yunbin Xu
   CATR
   Email: xuyunbin@ritt.cn

   Toshiaki Suzuki
   Hitachi


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   Email: toshiaki.suzuki.cs@hitachi.com

   Haomian Zheng
   Huawei
   Email: zhenghaomian@huawei.com

Authors' Addresses

   Young Lee (Editor)
   Huawei Technologies
   5340 Legacy Drive
   Plano, TX 75023, USA
   Phone: (469)277-5838
   Email: leeyoung@huawei.com

   Daniele Ceccarelli
   Ericsson
   Torshamnsgatan,48
   Stockholm, Sweden
   Email: daniele.ceccarelli@ericsson.com

   Takuya Miyasaka
   KDDI
   Email: ta-miyasaka@kddi.com

   Jong Yoon Shin
   SKT
   Email: jongyoon.shin@sk.com

   Kwang-koog Lee
   KT
   Email: kwangkoog.lee@kt.com

















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