Release 0 Data Model Details

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Overview

OSM supports descriptors for Virtual Network Functions and Network Services. The data models for these descriptors are aligned with ETSI MANO [1].

Virtual Network Function Descriptor [VNFD] defines the resources required for realizing the VNF. The descriptor includes various components that are part of the VNF. In addition, it also defines the VNF level configuration information.

Network Service Descriptor [NSD] defines a set of interconnected VNFs to realize a network service spanning multiple VNFs. In addition, NSD also defines the NS level configuration information.

Network Service Descriptor

The NSD connects VNFs using the Virtual Links (VLs) as shown in the following diagram:
Network service.png
The VNFs attach to the VLs using the Connection Points (CPs). So the NSD captures the list of VNFs and the VLs that connect the VNFs. The following diagram illustrates the high level objects in an NSD:
Nsd objects.png

An example NS containing an IMS VNF is here.

Virtual Network Function Descriptor (VNFD)

The VNFD connects Virtual Deployment Units (VDUs) using the internal Virtual Links (VLs). Each VDU represents a VM/Container. The following diagram illustrates the internal structure of VNFD:
Vnf internal.png

The VDUs attach to the internal VLs using the internal Connection Points (CPs). So the VNFD captures the list of VDUs and the internal VLs that connect the VDUs. Note that for a VNF containing a single VDU, there may not be any internal VLs. The following diagram illustrates the high level objects in an VNFD:
Vnfd objects.png

An example IMS VNF is here.

Data Modeling Language and Format

The VNF and NS descriptors are modeled using YANG. The input format for descriptor is YAML. The descriptors are validated against the YANG schema when the VNF/NS packages are on-boarded. For details about the YANG schema and descriptors refer to the "Detailed Documents/Information" section below.

Packages

The NSD and VNFD are on-boarded using NS and VNF packages respectively. At the time of instantiation additional artifacts such as images, icons, scripts, and charms are needed in addition to the descriptors. To provide a simple and one click on-boarding experience the packages encapsulate all necessary artifacts in addition to the descriptors. The packages are distributed in the tar.gz format.

NS Package

The NS package may contain the following files and directories:
| - nsd.yaml
| - README
| - checksum.txt
| - scripts\
| - icons\
| - config\

VNF Package

The VNF package may contain the following files and directories:
| - vnfd.yaml
| - README
| - checksum.txt
| - imagess\
| - scripts\
| - icons\
| - charms\

Detailed Documents/Information

Data Model Document: Media:OSM_Release0_Data_Models.doc
UML representation of Network Service Descriptor: Media:Nsd.png
UML representation of VNF Descriptor Media:Vnfd.png

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