TEAS Working Group                                   Young Lee (Editor)
                                                            Dhruv Dhody
Internet Draft                                                   Huawei

Intended status: Informational                           Sergio Belotti
Expires: April 10, 27, 2018
                                                       Khuzema Pithewan

                                                     Daniele Ceccarelli

                                                        Takuya Miyasaka

                                                         Jong Yoon Shin

                                                         Kwang-koog Lee

                                                       October 11, 27, 2017

        Requirements for Abstraction and Control of TE Networks




   This document provides a set of 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.

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Table of Contents

   1. Introduction...................................................3
   2. High-level ACTN requirements...................................4
      2.1. Service-Specific Requirements.............................4
      2.2. Network-Related Requirements..............................7
   3. References.....................................................9
      3.1. Normative References......................................9
      3.2. Informative References....................................9
   4. Contributors..................................................10
   Authors' Addresses...............................................11

1. Introduction

   This document provides a set of 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 orchestrate, 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

   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 resources from multiple TE networks (multiple
        technologies, equipment from multiple vendors, under the
        control of multiple administrations) through a process of
        hierarchical 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. Hierarchical abstraction allows for
        the recursion of controllers in a customer-provider

     - Orchestration of end-to-end virtual network services and
        applications via allocation of network resources to meet
        specific service, application and customer requirements.

     - 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.

     - Provision via a data model of a computation scheme 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.

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 VNs 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,

   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].

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
   policy that captures Service Level Agreements (SLA) associated with
   virtual network service (e.g., Endpoint selection policy, routing
   policy, time-related policy, 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 includes 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.,
          maximum bandwidth, minimum latency, minimum hops, etc. and
          any combination of them).
        - 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:

        - 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.,
           maximum bandwidth, minimum latency, minimum hops, etc. and
           any combination of them).
        - 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)

   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

   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 policy, etc.)

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

     7. Requirement 7: VNS Performance Monitoring

   The customer MUST be able to define performance monitoring
   parameters and its associated policy 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 (external entity versus internal
        - 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:

        - 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 Update: Upon customer's VNS performance monitoring
           setup, the network MUST be able to support VNS level
           Operations, Administration and Management (OAM) Monitoring
           under policy 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 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 Restoration

   End-to-end Path Restoration Operations MUST be provided with
   seamless coordination between domain-level recovery schemes and
   cross-domain recovery 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 query tens
           of thousands of nodes, and to examine tens of thousands of
           connectivity requests) for time-sensitive applications.

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

3. References

3.1. Normative References

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

3.2. Informative References

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

   [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, work in progress.

   [FANG] L. Fang, "ACTN Use Case for Multi-domain Data Center
             Interconnect", draft-fang-actn-multidomain-dci, work in

   [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,

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

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

   [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, work
             in progress.

   [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,
             work in progress.

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

   [SUZUKI] T. Suzuki, et. al., "Use-case and Requirements for Multi-
             domain Operation Plane Change", draft-suzuki-teas-actn-
             multidomain-opc, work-in-progress.

4. Contributors

   Yunbin Xu
   Email: xuyunbin@mail.ritt.com.cn xuyunbin@ritt.cn

   Toshiaki Suzuki
   Email: toshiaki.suzuki.cs@hitachi.com

   Haomian Zheng
   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

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

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

   Khuzema Pithewan
   Email: kpithewan@infinera.com

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

   Takuya Miyasaka
   Email: ta-miyasaka@kddi.com

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

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