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Life-cycle Services Orchestration (LSO) is an agile approach to streamlining and automating the service lifecycle in a sustainable fashion for coordinated management and control across all network domains responsible for delivering an end-to-end Connectivity Service (e.g., Carrier Ethernet, IP VPN, MPLS, etc.).

MEF has developed a Reference Architecture and Framework for orchestrating the service lifecycle. It includes a set of functional management entities that enable cooperative service lifecycle orchestration for MEF 3.0 Services. MEF 55 LSO Reference Architecture and Framework document describes the seven reference points between these entities. MEF members are actively involved in defining these interface reference points and from there creating open APIs based on a rigorous model-driven approach. Listed below are the seven reference points with the current status of work within MEF

LSO Cantata (CUS:BUS) belongs to the family of LSO Reference Points as defined in MEF 55. It defines the Management Interface Reference Point that provides a Customer Application Coordinator (including enterprise Customers) with capabilities to support the operations interactions (e.g., ordering, billing, trouble management, etc.) with the Service Provider’s Business Applications for a portion of the Service Provider service capabilities related to the Customer’s Products and Services (e.g., Customer Service Management interface).

This Reference Point consists of multiple Interface Profile Specifications (IPSs) that are currently under active collaborative development by MEF members. Each IPS will define the use cases and business requirements that will lead to the definition, modeling and development of one or more APIs. The APIs will be experimental and subject to change until the associated IPS is officially published. They will be made available via github.

LSO Allegro (CUS:SOF) belongs to the family of LSO Reference Points as defined in MEF 55. It defines the Management Interface Reference Point that allows Customer Application Coordinator supervision and control of dynamic service behavior of the LSO service capabilities under its purview through interactions with the Service Orchestration Functionality (SOF). When a Customer exercises dynamic service behavior via Allegro, the SOF must validate each request using the Service specific policies that govern such dynamic behavior. Such dynamic behavior and associated constraints are defined based on the Product Specification implemented by the Service. For example, a Service specific dynamic service policy may describe the range of bandwidth in which the Customer is permitted to throttle. Allegro may also be used to share service level fault information with the Customer.

This Reference Point consists of multiple Interface Profile Specifications (IPSs) that are currently under active collaborative development by MEF members.  Each IPS will define the use cases and business requirements that will lead to the definition, modeling and development of one or more APIs. The APIs will be experimental and subject to change until the associated IPS is officially published. They will be made available via github.

LSO Sonata (BUS:BUS) belongs to the family of LSO Reference Points as defined in MEF 55. It defines the Management Reference Point supporting the management and operations interactions (e.g., serviceability, ordering, billing, trouble ticketing, etc.) between two network providers (e.g., Service Provider and Partner Domain). For example, the Service Provider Business Applications may use Sonata to place an order to a Partner provider for an access service that is needed as a part of an end-to-end Connectivity Service.

This Reference Point consist of multiple Interface Profile Specifications (IPSs) that are currently under active collaborative development by MEF members - Product Ordering, Serviceability, Product Inventory, and Trouble Ticketing. In addition, several other IPSs are under active planning. Each IPS defines the use cases and business requirements that lead to the definition, modeling and development of one or more APIs. The APIs are experimental and subject to change until the associated IPS is officially published. For the latest Sonata APIs please visit MEF-Git. The repository is currently private with access to MEF members and special groups only.

LSO Interlude (SOF:SOF) belongs to the family of LSO Reference Points as defined by MEF 55. It defines the Management Reference Point that provides for the coordination of a portion of LSO services within the partner domain that are managed by a Service Provider’s Service Orchestration Functionality (SOF) within the bounds and policies defined for the service.

Through Interlude, the SOF may request initiation of technical operations or dynamic control behavior associated with a Service with a partner network domain. Such requests must be within the constraints set forth in the policies associated with established Services and performed without impacting business applications. Interlude may also be used to share service level fault information with the partner domain.

This Reference Point consists of multiple Interface Profile Specifications (IPSs) that are currently under active collaborative development by MEF members. Each IPS will define the use cases and business requirements that will lead to the definition, modeling and development of one or more APIs. The APIs will be experimental and subject to change until the associated IPS is officially published. They will be made available via github.

LSO Legato (BUS:SOF) belongs to the family of LSO Reference Points as defined by MEF 55. It defines the Management Reference Point between the business applications and service orchestration functionality needed to allow management and operations interactions supporting LSO services. For example, the Business Applications may, based on a Customer order, use Legato to request the instantiation of a Connectivity Service. Legato may also allow the SOF to describe Services and capabilities it is able to instantiate. Also, the Service Orchestration Function may use Legato to ask the Business Applications to place an order to a Partner provider for the access service needed as a Service Component of an end-to-end Connectivity Service.

This Reference Point consists of multiple Interface Profile Specifications (IPSs) the first of which is under active development in collaboration with the ONAP External APIs project.  This IPS will define the use cases and business requirements that will lead to the definition, modeling and development of multiple APIs. The APIs will be experimental and subject to change until the associated IPS is officially published. They will be made available via github.

LSO Presto (SOF:ICM) belongs to the family of LSO Reference Points as defined in MEF 55. It defines the resource Management Reference Point needed to manage the network infrastructure, including network and topology view related management functions. For example, the Service Orchestration Function will use Presto to request Infrastructure Control and Management (ICM) to create connectivity or functionality associated with specific Service Components of an end-to-end Connectivity Service within the domain managed by each ICM. Presto may also allow the ICM to describe Resources and capabilities it is able to instantiate.

This Reference Point consist of Network Resource Provisioning Interface Profile Specification (IPS) published as MEF 60. In addition, it includes several other Interface Profile Specifications that are currently under active collaborative development by MEF members. The Network Resource Provisioning IPS defines the use cases and business requirements that led to the definition, modeling and development of multiple APIs. For the latest Presto APIs please visit MEF-Git. The repository is currently private with access to MEF members and special groups only.

LSO ADAGIO (ICM:ECM) belongs to the family of LSO Reference Points as defined in MEF 55. It defines the element Management Interface Reference Point needed to manage the network resources, including element view related management functions. For example, Infrastructure Control and Management (ICM) will use Adagio to implement cross-connections or network functions on specific elements via the Element Control and Management (ECM) functionality responsible for managing the element.

This Reference Point will consists of multiple Interface Profile Specifications (IPSs). Each IPS will define the use cases and business requirements that will lead to the definition, modeling and development of one or more APIs. The APIs will be experimental and subject to change until the associated IPS is officially published. They will be made available via github.

There is currently no active work within MEF at this Reference Point.

For more information on the LSO APIs, contact the LSO Committee Co-Chairs by sending an email to This email address is being protected from spambots. You need JavaScript enabled to view it.

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