LSO Legato

Intra-domain service orchestration and automation.


Within the LSO Reference Architecture, LSO Legato represents the interface between the business-applications layer and service-orchestration functionality, within a service-provider domain. It is the vehicle that takes a business-level operation, such as ordering a service, and communicates that requirement to the service orchestration layer, to instantiate that service within a provider’s domain.

MEF’s work specifically focuses on defining APIs for MEF 3.0 services, including:

  • Service Catalog
  • Service Ordering
  • Service Inventory
  • Service Notification

See MEF’s Technical Standards & Educational Materials for LSO Legato

MEF Dots Pattern

LSO Legato Interface Reference Point

LSO Legato is the Interface Reference Point between the business applications and service-orchestration functionality, supporting the management and operations of a service within a service provider’s domain.

Intra-Domain Service-Orchestration Interface

Intra-Domain Service-Orchestration Interface

LSO Legato API Advantages

By using a common, standard set of APIs to communicate between the business- and service-orchestration layers within a provider domain, numerous cost and operational benefits are realized by both the provider as well as the technology suppliers for both the business applications and the service-orchestration functions.

For example, a technology provider of service-orchestration functionality has to work to ensure they can interface with multiple and often proprietary business applications, including commercial applications and provider-developed custom applications. This need adds significant development cost and product-management costs for the technology provider; it can limit their compatibility for some providers as well as slow down implementation to support custom integration.

Similarly, business-application technology providers, or in some cases providers themselves when using custom-developed applications, have to develop the ability to interface with different, and often proprietary service-orchestration software. Having common, standard APIs, increases the agility of the provider, as well as lowering development and testing costs, and speeding implementation.

Service-Provider Specific APIs vs Standard LSO Legato APIs

Common, industry-standard APIs can significantly reduce costs for both service providers and technology peers of business-application and service-orchestration software.

Sevice Provider- / SOF-specific APIs
Standard LSO Legato APIs

What Can I Achieve with MEF LSO Legato APIs?

Standard APIs remove the need for each supplier from having to implement each service provider’s APIs. Service providers avoid the cost of having to implement technology suppliers’ proprietary APIs, which in turn enhances service providers’ ability to adopt best-in-breed solutions. Common information models ease internal development of microservices by eliminating mapping between proprietary models.

MEF LSO Legato API advantages:

  • Reduced product-management costs for technology providers.
  • Lower implementation costs for service providers.
  • Optimized development costs focused on feature/function versus integration.
  • Faster service implementation.
  • Lower total cost of ownership for service providers.

Learn More about LSO Legato:

Technical Standards & SDKs:

LSO Framework Release ‘Billie’ — 2021 Jun

Product Portfolio: LSO Legato, LSO Sonata, LSO Presto

The theme of this release is Ordering and Inventory: it delivers full coverage of Business Requirements, API and API Developer Guides for Ordering and Inventory API functions. NOTE: Some parts of the release are for MEF Members only.

Learn More

LSO Legato SDK Release Candidate 4 — 2020 Jul

Product Portfolio: LSO Legato

MEF LSO Legato SDK core includes API definitions for the following functional areas:
• Service Catalog
• Service Ordering
• Service Inventory
• Service Notification

In addition to the Service Provisioning APIs, the SDK includes the following MEF Service Specification schemas:
• SD-WAN Services
• Carrier Ethernet Services
• L1 Connectivity Services

Learn More

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Be In the Know

Engage in LSO Legato Knowledge-Sharing

Joining discussions with subject-matter experts provides the insight you need to dig deeply into intra-domain service orchestration and automation within the service provider domain. As a MEF member, you can access the latest LSO Legato projects in the MEF 3.0 LSO Legato Hub on the MEF Members’ Wiki.

All employees of active MEF-member companies are authorized to access MEF Members’ Wiki. Don’t have a login? Register. Not a member? Join MEF. Not sure? Contact Us.

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