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How to Design a Network Service

There are a number of tasks involved in designing a Network Service (NS). In order to understand what a network service is, we first need to look at what it consists of.

What is a Network Service?

A Network Service, is a collection of VNF and/or PNF that will be used by Stratoss™ Lifecycle Manager (LM) to instantiate either a complete end-to-end service for a customer or, a significant portion of a customer’s service. A network service (NS) is created by using a Stratoss LM Assembly Descriptor. The descriptor will compose and reference other Network Services, VNF or PNF. Generally, the Network Service will not refer directly to VNFC.

Anatomy of a NS

Component Sub-component Description
Network Service Network Service Descriptor (Assembly) A Network Service Descriptor (Assembly) is a yam file that describes the properties and composition of the Network Service.
Service behaviour test scenarios scripts that are used to test NS functionality and are created during the design phase.
VNF A VNF provides a single function within a Network Service. A Network Service may consist of one or multiple VNFs.

Tasks to develop a Network Service

To develop a Network Service, there are multiple steps that are outlined in the picture below: Steps to develop a VNF

Tools to develop a Network Service

To develop a NS, there are multiple tools that are used to allow people to collaborate on creating, testing, maintaining and automating the development of Network Services.


The Continuous Integration / Continuous Delivery Hub, or CI/CD Hub, provides a set of standards, tools and automation patterns designed to simplify and accelerate the network service continuous integration and deployment journey. The CI/CD Hub includes a source code repository, image repository and an automation server.

More information about the tools in the CI/CD Hub can be found here .

Stratoss LM environment

Designing a NS is done through the Designer section of Stratoss LM. This is typically done on a local or dedicated development environment. The Designer has a graphical User Interface with which you can drag and drop VNF and other elements, establish relationships, modify properties, etc.


LMCTL is a command line tool that allows you to create, pull, push and test Network Service projects to a Stratoss LM environment. LMCTL is also used by the automation server to issue these commands and execute the automated pipeline. The LMCTL tool can be installed from the CI/CD Hub.