[OASIS Issue Tracker] (TOSCA-187) Using TOSCA template to describe the NFV forwarding graph

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    [ https://issues.oasis-open.org/browse/TOSCA-187?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=48040#comment-48040 ] 

Chris Lauwers commented on TOSCA-187:
-------------------------------------

I haven't looked at the NFV gap analysis in a while, but it seems to me that TOSCA in itself doesn't really have any shortcomings as it relates to modeling NFV: the concepts of "nodes" and "relationships" can be used to model any graph, whether it's a NFV service graph or a network topology graph. If there are any shortcomings with TOSCA for NFV, they're likely with the normative type definitions instead rather than with the basic concepts. But even there it seems that the most recent contributions to the Simple Profile spec have started to address these and we should be able to model both graphs within the same service template:

- It seems that we can model "service graphs" using Software Component node types and the "Connects To" relationships between them.
- A network topology graph can be modeled using the Compute Nodes on which these Software Components are hosted, the Port nodes that connect compute nodes to networks, and the Network nodes themselves. The Network and LinkedTo relationships link all these nodes together into a topology graph.

If my understanding is correct, then there wouldn't be a need for a ForwardingGraph node type and associated graph file artifacts. We would instead focus on:
- defining the necessary Network nodes (ELAN, ELINE, and ETREE) to satisfy NFV's requirements
- figure out where to model the necessary QoS requirements

These efforts would result in a set of domain-specific Type definitions for NFV

> Using TOSCA template to describe the NFV forwarding graph
> ---------------------------------------------------------
>
>                 Key: TOSCA-187
>                 URL: https://issues.oasis-open.org/browse/TOSCA-187
>             Project: OASIS Topology and Orchestration Specification for Cloud Applications (TOSCA) TC
>          Issue Type: New Feature
>            Reporter: Shitao Li
>            Assignee: Shitao Li
>
> NFV (network function virtualization) will study the gap between NS description in NFV and tosca template. 
> VNFFG(VNF forwarding graph) is one of the gap that may need TOSCA to add some more features to fit the requirements.



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