The NSD class is a deployment template whose instances are used by the NFVO for the lifecycle management of NSs. For all attributes in this class, the Producer is SDC and the Consumer is SDC/UUI/VFC Identifier of this NSD class. It globally uniquely identifies an instance of the NSD Identifies the designer of the NSD. Identifies the version of the NSD. Provides the human readable name of the NSD. Identifies an NSD in a version independent manner. This attribute is invariant across versions of NSD. Specifies a rule to trigger a scaling action on a NS instantiated according to the NSD. NOTE 1: The rule is based on a combination of assertions on the values of virtualised resource-related performance metrics and VNF Indicators identified by the monitoredInfo attribute. NOTE 2: There may be multiple data sources (each identified as monitoredInfo) per rule Identifies either a virtualised resource-related performance metric or a VNF Indicator. Provides a life cycle management script written in a Domain Specific Language (DSL). Provides the constituent VLDs. Cardinality of 0 means that the NS is a NF set with unspecified connectivity. References the VNFD of a constituent VNF. References the PNFD of a constituent PNF. The NsVirtualLinkDesc class provides general information enabling the instantiation of virtual links. For all attributes in this class the Producer is SDC and the Consumer is SDC/UUI/VFC. Defines the organization generating the VLD. Specifies the version of the VLD. Specifies properties for instantiating a VL according to a specific flavour. The NsDf class specifies the properties of a variant of an NS. NOTE: Every VNF, VL and nested NS whose descriptor is referenced by the NS DF shall be involved in an NS instantiation level of the parent NS. If no instances of a given VNF/nested NS have to be deployed at NS instantiation time, the numberOfInstances attribute in the corresponding VnfToLevelMapping/NsToLevelMapping datatype shall be set to 0. Identifies this NsDf class. It identifies a NS DF within the NSD. Assurance parameter against which this flavour is being described. The key can be a combination of multiple assurance parameters with a logical relationship between them. The parameters should be present as a monitoredInfo attribute in the NSD. Identifies either a virtualised resource-related performance metric or a VNF Indicator. Describes the details of an NS level. NOTE: Every VNF, VL and nested NS whose descriptor is referenced by the NS DF shall be involved in an NS instantiation level of the parent NS. If no instances of a given VNF/nested NS have to be deployed at NS instantiation time, the numberOfInstances attribute in the corresponding VnfToLevelMapping/NsToLevelMapping datatype shall be set to 0. Specifies affinity or anti-affinity relationship applicable between the VNF instances created using different VNFDs, the Virtual Link instances created using different NsVirtualLinkDescs or the nested NS instances created using different NSDs in the same affinity or anti-affinity group. The scaling aspects supported by this DF of the NS. PNF profile to be used for the NS flavour. Specifies a NS Profile supported by this NS DF. VNF profile to be used for the NS flavour. Specifies the order in which instances of the VNFs and/or nested NSs have to be created. VL profile to be used for the NS flavour. The Vnffgd class specifies a topology of connectivity of a NS and optionally forwarding rules applicable to the traffic conveyed over this topology. Identifier of this Vnffgd information element. It uniquely identifies a VNFFGD. References the VNFD of a constituent VNF. NOTE 1: The list of constituent VNFs, PNFs, and nested NS SAPs of a VNFFG can be identical to the list of constituent VNFs, PNFs and nested NSs of the parent NSD, or can be a subset of it. NOTE 2: The presence of a VNFD or PNFD identifier in a VNFFGD does not imply that all connection points instantiated from all embedded CPDs are connected to the VNFFG instantiated using the VNFFGD. A reference to a pool of descriptors of connection points attached to one of the constituent VNFs and PNFs and/or one of the SAPs of the parent NS or of a nested NS. The network forwarding path associated to the VNFFG. References the PNFD of a constituent PNF. NOTE 1 : The list of constituent VNFs, PNFs, and nested NS SAPs of a VNFFG can be identical to the list of constituent VNFs, PNFs and nested NSs of the parent NSD, or can be a subset of it. NOTE 2: The presence of a VNFD or PNFD identifier in a VNFFGD does not imply that all connection points instantiated from all embedded CPDs are connected to the VNFFG instantiated using the VNFFGD. The SAPD class specifies the information used to instantiate the service access points of an NS. A Sapd inherits from the Cpd class. All attributes of the Cpd are also attributes of the Sapd. Specify whether the SAP address assignment is under the responsibility of management and orchestration functions or not. If it is set to True, management and orchestration functions are responsible for assigning addresses to the access points instantiated from this SAPD. References the descriptor of VNF or PNF external connection points the SAPs instantiated from this SAPD are mapped to. References the descriptor of the NS VL instance to which the SAP instantiated from this SAPD connects to. The Pnfd class is a deployment template enabling on-boarding PNFs and referencing them from an NSD. It focuses on connectivity aspects only. Identifier of this Pnfd class. It uniquely identifies the PNFD. Identifies the provider of the PNFD. NOTE: The provider of the PNFD might be different from the provider of the PNF. Identifies the version of the PNFD Provides a signature to prevent tampering. Specifies the characteristics of one or more connection points where to connect the PNF to a VL. A PnfExtCpd is a type of Cpd and describes the characteristics of an external interface, a.k.a external CP, where to connect the PNF to a VL. A PnfExtCpd inherits from the Cpd Class. The LifeCycleManagementScript information element specifies a script for the NS. Describes NS lifecycle event(s) or an external stimulus detected on an NFVO reference point. NOTE 1: A minimum set of NS lifecycle events triggered internally by the NFVO includes: start instantiation, end instantiation, start scaling, end scaling, start healing, end healing, start termination, end termination, start update, end update. NOTE 2: A minimum set of external stimulus includes: the receipt of request message of instantiation, scaling, healing, termination, update of NS. Includes an NS LCM script (e.g., written in a DSL) triggered to react to one of the events listed in the event attribute. The VirtualLinkDf datatype specifies properties for instantiating a VL according to a specific flavour. Identifies this VirtualLinkDF datatype within a VLD. Specifies quality of service parameters applicable to a VL. Specifies one of the three levels defined in ETSI GS NFV-REL 001: • Level 1 • Level 2 • Level 3 The NsQoS datatype specifies quality of service parameters applicable to a NS VL. Specifies the priority level in case of congestion on the underlying physical links. Specifies one of the three levels defined in ETSI GS NFV-REL 001: • Level 1 • Level 2 • Level 3 The MonitoredData datatype identifies information to be monitored during the lifetime of a network service instance.