Class Diagram

Based on ONF Core IM (https://3vf60mmveq1g8vzn48q2o71a-wpengine.netdna-ssl.com/wp-content/uploads/2018/01/TR-512_v1.3.1_OnfCoreIm-info.zip).

ONAP Wan Descriptor Connection IM is designed as below class diagram (Papyrus UML is coming soon):Image Removeddiagram:

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• Wan Connection: The Wan Connection is Resource Composite.
• Forwarding Construct: The Forwarding Construct (FC) class models enabled constrained potential for forwarding between interfaces at a particular specific layerProtocol. 
• FC Port: Fowarding Construct Port. The association of the FC to interfaces is made via FC Ports. The FC Port class models the access to the FC function.  
• Forwarding Domain: The Forwarding Domain (FD) class models the topological component that represents a forwarding capability that provides the opportunity to enable forwarding (of specific transport characteristic information at one or more protocol layers) between points.
• FC Route: Each instance of an FC Route class models an individual route of an FC. The route of an FC object is represented by a list of FCs at a lower level with the implicit understanding that unmodeled link connections are interleaved between the lower level FCs.
• Link: The Link class models effective adjacency between two or more ForwardingDomains (FD). 
• LinkPort: The association of the Link to LTPs is made via LinkPort. The LinkPort class models the access to the Link function. 
• LTP: The Logical Termination Point (LTP) class encapsulates the termination and adaptation functions of one or more transport layers represented by instances of LayerProtocol.

ONF CIM reference:

The wan descriptor connection application for general scenario is shown as below diagram:

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There is a special resource class not shown in the class diagram above, that is configurationspecification. The classes of Wan Descriptor of w an shown above are abstract, we could use them to describe any wan scenario with specify configuration specification which has the specify parameters for the scenario. For example, we could use overlay vpn configuration specification an FC to describe overlay vpn. All specify configuration specification classes are derived from configuration specification base class which is shown as below diagram: 

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The specify configuration specification class will be consumed by specify Direct Graph in SDN-C. As we could import configuration specification class in SDC and import DG in SDN-C dynamically, new wan scenario could be taught to ONAP after version release.

Use Case Example

Take the ONAP R1 VoLTE use case as an example. Volte wan contains overlay vpn and underlay vpn, both of them could be described as a FC. And the relationship between overlay vpn and underlay vpn could be described by FCRoute and LinkConnection.

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Volte Wan template example: VoLTE_WAN_template.yaml

Class Dtail

• Wan Design Time Information Model
• Wan Run Time Information Model
• Wan Design Time Data Model

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