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<h1 id="architecture">Architecture</h1>
<p>Openslice offers the following main functionalities:</p>
<ul>
<li>Service Catalog Management: A CSP will have the ability to manage the Service Catalog Items, their attributes , organize in categories and decide what to make available to Customers</li>
<li>Services Specifications: A CSP will be able to manage Service Specifications</li>
<li>Service Catalog Exposure: A CSP will be able to expose catalog to customers and related parties</li>
<li>Service Catalog to Service Catalog: Openslice able to consume and provide Service Catalog items to other catalogs</li>
<li>Service Order: The Customer will be able to place a Service Order</li>
<li>Service Inventory: The Customer and Provider will be able to view deployed Services status</li>
</ul>
<p>The following figure displays the overall architecture of Openslice.</p>
<p><a href="../../images/architecture.png"><img alt="Openslice  architecture" src="../../images/architecture.png" /></a></p>
<p>Openslice allows Vertical Customers browsing the available offered service specifications. It consists of:</p>
<ul>
<li>Web frontend UIs that consist of mainly two portals: i) a NFV portal allowing users self-service management and onboarding VNFDs/NSDs to facility’s NFVO ii) a Services Portal, which allows users to browse the Service Catalog, Service Blueprints specifications and the Service Inventory</li>
<li>An API gateway that proxies the internal APIs and used by the web front end as well as any other 3rd party service</li>
<li>A Message Bus where all microservices use it to exchange messages either via message queues or via publish/subscribe topics</li>
<li>An authentication server implementing Oauth2 authentication scheme</li>
<li>A microservice offering TMF compliant API services (eg Service Catalog API, Service Ordering APIetc)</li>
<li>A microservice offering NFV API services (eg VNF/NSD onboarding etc) and allows to store VNFDs and NSDs in a catalog</li>
<li>A microservice that is capable to interface to an issue management system. For example it raises an issue to all related stakeholders (CSP, NOP, CSC) that a new Service Order is requested</li>
<li>Central logging microservice that is capable to log all distributed actions in to an Elasticsearch cluster</li>
<li>A Service Orchestrator solution that will propagate Service Ordering requests to the equivalent SOs and NFVOs </li>
</ul>
<p>The following figure depicts how Openslice microservices are deployed</p>
<p><a href="../../images/microservices_network_deployment.png"><img alt="Openslice microservices network deployment" src="../../images/microservices_network_deployment.png" /></a></p>
<h2 id="deploying-openslice-in-multi-domain-scenarios">Deploying Openslice in multi domain scenarios</h2>
<p>A typical deployment across domains, involves today some typical components: i) an OSS/BSS to allow customers access the service catalog and perform service orders, ii) a Service Orchestrator (SO) component for executing the service order workflow, as well as iii) a Network Functions Virtualization Orchestrator (NFVO) for configuring the iv) network resources.</p>
<p>TMF Open APIs are introduced not only for exposing catalogues and accepting service orders, but also implementing the East-West interfaces between the domains, fulfilling also the LSO requirements as introduced by MEF.</p>
<p>The following figure shows how openslice could be used in such scenarios:</p>
<p><a href="../../images/multi-domain-architecture.png"><img alt="Openslice  multi-domain-architecture" src="../../images/multi-domain-architecture.png" /></a></p>
<p>See more <a href="../consumingServicesFromExternalPartners/">Consuming Services From External Partner Organizations</a></p></div>
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