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

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• 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.

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