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 NsScalingAspect class describes the details of an NS scaling aspect. An NS scaling aspect is an abstraction representing a particular "dimension" or "property" along which a given NS can be scaled. Defining NS levels, in this context also known as NS scale levels, within an NS scaling aspect allows to scale NS instances "by steps", i.e. to increase/decrease their capacity in a discrete manner moving from one NS scale level to another. Scaling by a single step does not imply that exactly one instance of each entity involved in the NS scale level is created or removed. Identifier of this NsScalingAspect class. It Uniquely identifies the NS scaling aspect in an NSD. Provides a human readable name of the NS scaling aspect. Provides a human readable description of the NS scaling aspect. Describes the details of an NS level. NOTE: Only a subset of the VNFs, VLs and nested NSs whose descriptor is referenced by the NS DF may be involved in an NS scale level of the parent NS. The NsLevel class describes the details of an NS level. An NS level consists of a list of involved entities, i.e. VNFs, VLs and/or nested NSs. For each involved VNF/nested NS, the number of instances required by the NS level is specified. For each involved VL, the bitrate requirements corresponding to the NS level are specified. NS levels shall be used in the context of NS instantiation and in this case they are referred to as NS instantiation levels. 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. NS levels may be used in the context of NS scaling and in this case they are referred to as NS scale levels. Only a subset of the VNFs, VLs and nested NSs whose descriptor is referenced by the NS DF may be involved in an NS scale level of the parent NS. Identifier of this NsLevel class. It uniquely identifies an NS level within the DF. Human readable description of the NS level. Specifies the profile of the VNFs involved in this NS level and, for each of them, the required number of instances. Specifies the profile of the VLs involved in this NS level and, for each of them, the needed bandwidth. Specifies the profile of the nested NSs involved in this NS level and, for each of them, the required number of instances. The NsProfile class specifies the profile to be used for a nested NS. Identifies an NS profile. Minimum number of nested NS instances based on the referenced NSD that is permitted to exist for this NsProfile. Maximum number of nested NS instances based on the referenced NSD that is permitted to exist for this NsProfile. Identifies an affinity or anti-affinity group the NSs created according to this NsProfile belong to. Identifies the applicable NS DF within the scope of the NSD. Identifies the NS level within the referenced NS DF to be used in the context of the parent NS instantiation. If not present, the default NS instantiation level as declared in the referenced NSD shall be used. Identifies the NSD applicable to NS instantiated according to this profile. This class provides run-time information about an NS VL instance. Virtualised network resource(s) realizing this VL. Respresents the port of a NS VL. 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. The NsToLevelMapping datatype specifies the profile to be used for a nested NS involved in a given NS level and the required number of instances. Identifies the profile to be used for a nested NS involved in the NS level. Specifies the number of nested NS instances required for the NS scale level. NOTE 1: It shall be in the range of minNumberOfInstances-maxNumberOfInstances, as specified in the referenced NsProfile. NOTE 2: When the corresponding NS level is used in the context of NS instantiation, the numberOfInstances attribute specifies the number of nested NS instances to be deployed. NOTE 3: When the corresponding NS level is used in the context of NS scaling, the numberOfInstances attribute does not specify the number of nested NS instances to be added/removed when reaching that NS scale level. The actual number of nested NS instances to be added/removed can be derived by subtracting the numberOfInstances declared in the source NS scale level from the numberOfInstances declared in the target NS level of the scaling request. The NsVirtuallLinkConnectivity datatype describes connection information between a connection point and a NS virtual Link. Reference an NS VL profile. References the descriptor of a connection point on a VNF/PNF or a SAP which connects to virtual links instantiated from the profile identified in the virtualLinkProfileId attribute.