etsi-nfv-vnf.yang 80.4 KB
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            "Identifies the virtualisation environments
             (e.g. hypervisor) compatible with this software
             image.";
          reference
            "GS NFV IFA011: Section 7.1.6.5, SwImageDesc
             information element.";
        }
      }

      list int-virtual-link-desc {
        key "id";
        description
          "Represents the type of network connectivity mandated by the
           VNF provider between two or more CPs which includes at
           least one internal CP.";
        reference
          "GS NFV IFA011: Section 7.1.2, Vnfd information element.";
        leaf id {
          type string;
          description
            "Unique identifier of this internal VLD in VNFD.";
          reference
            "GS NFV IFA011: Section 7.1.7.2, VnfVirtualLinkDesc
             Information elements.";
        }

        list desc-flavor {
          key "id";
          description
            "Describes a specific flavour of the VL with specific
             bitrate requirements.";
          reference
            "GS NFV IFA011: Section 7.1.7.2, VnfVirtualLinkDesc
             Information elements.";

          leaf id {
            type string;
            description
              "Identifies a flavour within a VnfVirtualLinkDesc.";
            reference
              "GS NFV IFA011: Section 7.1.8.5, VirtualLinkDescFlavor
               information element.";
          }
          container qos {
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	    presence "VL QoS parameters";
            description
              "QoS of the VL.";
            reference
              "GS NFV IFA011: Section 7.1.8.5, VirtualLinkDescFlavor
               information element.";

            leaf latency {
              type uint32;
              units "ms";
              mandatory true;
              description
                "Specifies the maximum latency in ms.";
              reference
                "GS NFV IFA011: Section 7.1.8.10, QoS information
                 element.";
            }

            leaf packet-delay-variation {
              type uint32;
              units "ms";
              mandatory true;
              description
                "Specifies the maximum jitter in ms.";
              reference
                "GS NFV IFA011: Section 7.1.8.10, QoS information
                 element.";
            }

            leaf packet-loss-ratio {
              type decimal64 {
                fraction-digits "2";
                range "0..1.00";
              }
              description
                "Specifies the maximum packet loss ratio.";
              reference
                "GS NFV IFA011: Section 7.1.8.10, QoS information
                 element.";
            }
          }
        }
        uses connectivity-type;
        leaf-list test-access {
          type string;
          description
            "Specifies test access facilities expected on the VL
             (e.g. none, passive monitoring, or active (intrusive)
             loopbacks at endpoints.";
          reference
            "GS NFV IFA011: Section 7.1.7.2, VnfVirtualLinkDesc
             information element.";
        }
        leaf description {
          type string;
          description
            "Provides human-readable information on the purpose of
             the VL (e.g. control plane traffic).";
          reference
            "GS NFV IFA011: Section 7.1.7.2, VnfVirtualLinkDesc
             information element.";
        }
        list monitoring-parameters {
          key "id";
          leaf id {
            type string;
            description
              "Unique identifier of the monitoring parameter.";
          reference
            "GS NFV IFA011: Section 7.1.11.3, MonitoringParameter
             information element.";
          }
          uses monitoring-parameter;
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      list security-group-rule {
        key "id";

        leaf id {
          type string;
          description
            "Identifier of this SecurityGroupRule information
             element.";
          reference
            "GS NFV IFA011: Section 7.1.6.9, SecurityGroupRule
             information element.";
        }

        leaf description {
          type string;
          description
            "Human readable description of the security group rule.";
          reference
            "GS NFV IFA011: Section 7.1.6.9, SecurityGroupRule
             information element.";
        }

        leaf direction {
          type enumeration {
            enum ingress;
            enum egress;
          }
          default "ingress";
          description
            "The direction in which the security group rule is applied.
             Permitted values: INGRESS, EGRESS. Defaults to INGRESS.";
          reference
            "GS NFV IFA011: Section 7.1.6.9, SecurityGroupRule
             information element.";
        }

        leaf ether-type {
          type enumeration {
            enum ipv4;
            enum ipv6;
          }
          default "ipv4";
          description
            "Indicates the protocol carried over the Ethernet layer.
             Permitted values: IPV4, IPV6. Defaults to IPV4.";
          reference
            "GS NFV IFA011: Section 7.1.6.9, SecurityGroupRule
             information element.";
        }

        leaf protocol {
          type enumeration {
            enum tcp;
            enum udp;
            enum icmp;
          }
          default "tcp";
          description
            "Indicates the protocol carried over the IP layer.
             Permitted values: any protocol defined in the IANA
             protocol registry, e.g. TCP, UDP, ICMP, etc. Defaults
             to TCP.";
          reference
            "GS NFV IFA011: Section 7.1.6.9, SecurityGroupRule
             information element.";
        }

        leaf port-range-min {
          must ". <= ../port-range-max";
          type uint16;
          default "0";
          description
            "Indicates minimum port number in the range that is
             matched by the security group rule. Defaults to 0.";
          reference
            "GS NFV IFA011: Section 7.1.6.9, SecurityGroupRule
             information element.";
        }

        leaf port-range-max {
          must ". >= ../port-range-min";
          type uint16;
          default "65535";
          description
            "Indicates maximum port number in the range that is
             matched by the security group rule. Defaults to 65535.";
          reference
            "GS NFV IFA011: Section 7.1.6.9, SecurityGroupRule
             information element.";
        }

        description
          "Defines security group rules to be used by the VNF.";
        reference
          "GS NFV IFA011: Section 7.1.2, VNFD information element.";
      }

      list ext-cpd {
        key "id";
        min-elements 1;

        description
          "Describes an external interface exposed by this VNF enabling
           connection with a Virual Link";
        reference
          "GS NFV IFA011: Section 7.1.2, VNFD information element.";
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	choice cp-connection {
          leaf int-virtual-link-desc {
            description
              "Reference to the internal Virtual Link Descriptor (VLD)
               to which CPs instantiated from this external CP
               Descriptor (CPD) connect. Either intVirtualLinkDesc or
               intCpd shall be present.";
            type leafref {
              path "../../nfv:int-virtual-link-desc/nfv:id";
            }
          }
          container int-cpd {
            leaf vdu-id {
              type leafref {
                path "../../../vdu/id";
              }
            }
            leaf cpd {
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              type leafref {
                path "deref(../vdu-id)/../int-cpd/id";
              }
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            }
          }
        }
        uses virtual-network-interface-requirements;
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        uses cpd;

        leaf security-group-rule-id {
          type leafref {
            path "../../security-group-rule/id";
          }
          description
            "Reference of the security group rules bound to this
             CPD.";
          reference
            "GS NFV IFA011: Section 7.1.6.3 Cpd information element";
	}
        must "nfv:default-instantiation-level or " +
             "count(nfv:instantiation-level) = 1";
        key "id";
        min-elements 1;
        description
          "Describes a specific Deployment Flavour (DF) of a VNF with
           specific requirements for capacity and performance.";
        reference
          "GS NFV IFA011: Section 7.1.2, VNFD information element.";
        leaf id {
          type string;
          description
            "Identifier of this DF within the VNFD.";
          reference
            "GS NFV IFA011: Section 7.1.8, Information elements
             to the DeploymentFlavor.";
        }
        leaf description {
          type string;
          description
            "Human readable description of the deployment flavor";
          reference
            "GS NFV IFA011: Section 7.1.8, Information elements
             to the DeploymentFlavor.";
        }
        list vdu-profile {
          key "id";
          min-elements 1;
          description
            "The Vduprofile describes additional instantiation data for
             a given VDU used in a deployment flavour.";
          reference
            "GS NFV IFA011: Section 7.1.8, Information elements
             to the DeploymentFlavor.";
          leaf id {
            type leafref {
              path "../../../nfv:vdu/nfv:id";
            }
            reference
              "GS NFV IFA011: Section 7.1.8.3, VduProfile information
               element.";
          }
          leaf min-number-of-instances {
            type uint16;
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            default 1;
            description
              "Minimum number of instances of the VNFC based on this
               VDU that is permitted to exist for this flavour.";
            reference
              "GS NFV IFA011: Section 7.1.8.3, VduProfile information
               element.";
          }
          leaf max-number-of-instances {
            type uint16;
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            default 1;
            must ". >= ../nfv:min-number-of-instances";
            reference
              "GS NFV IFA011: Section 7.1.8.3, VduProfile information
               element.";
          }
          uses local-affinity-or-anti-affinity-rule;
          list affinity-or-anti-affinity-group {
            key "id";
            description
              "Identifier(s) of the affinity or anti-affinity
               group(s) the VDU belongs to.";
            reference
              "GS NFV IFA011: Section 7.1.8.3, VduProfile information
               element.";
            leaf id {
              type leafref {
                path "../../../" +
                     "nfv:affinity-or-anti-affinity-group/" +
                     "nfv:id";
              }
              description
                "Identifies an affinity or anti-affinity group to
                  which the affinity or anti-affinity rule applies.";
              reference
                "GS NFV IFA011: Section 7.1.8.12, AffinityOrAntiAffinity
                 information element.";
            }
            leaf type {
              type enumeration {
                enum affinity;
                enum anti-affinity;
              }
              description
                "Specifies whether the rule is an affinity rule or an
                 anti-affinity rule.";
              reference
                "GS NFV IFA011: Section 7.1.8.12, AffinityOrAntiAffinity
                 information element.";
            }
            leaf scope {
              type affinity-scope;
              description
                "Specifies the scope of the rule, possible values are
                 'NFVI-PoP', 'Zone', 'ZoneGroup', 'NFVI-node'";
              reference
                "GS NFV IFA011: Section 7.1.8.12, AffinityOrAntiAffinity
                 information element.";
            }
          }
        }
        list virtual-link-profile {
          key "id flavor";
          description
            "Defines the internal VLD along with additional data which
             is used in this DF.";
          reference
            "GS NFV IFA011: Section 7.1.8.2, VnfDf information
             element.";

          leaf id {
            type leafref {
              path "../../../nfv:int-virtual-link-desc/nfv:id";
            }
            description
              "Uniquely identifies a Vnf VLD.";
            reference
              "GS NFV IFA011: Section 7.1.8.4, VirtualLinkProfile
               information element.";
          }
          leaf flavor {
            type leafref {
              path "deref(../../../ext-cpd/int-virtual-link-desc)" +
                   "/../desc-flavor/id";
            }
            description
              "Identifies a flavour within the VnfVirtualLinkDesc.";
            reference
              "GS NFV IFA011: Section 7.1.8.4, VirtualLinkProfile
               information element.";
          }
          uses local-affinity-or-anti-affinity-rule;
          list affinity-or-anti-affinity-group {
            key "id";
            leaf id {
              type leafref {
                path "../../../" +
                     "nfv:affinity-or-anti-affinity-group/" +
                     "nfv:id";
              }
            }
            description
              "Identifier(s) of the affinity or anti-affinity
               group(s) the VnfVirtualLinkDesc belongs to.";
            reference
              "GS NFV IFA011: Section 7.1.8.4, VirtualLinkProfile
               information element.";
          }
        }
        list instantiation-level {
          key "id";
          min-elements 1;
          description
            "Describes the various levels of resources that can be
             used to instantiate the VNF using this flavour.
             Examples: Small, Medium, Large. If there is only one
             'instantiationLevel' entry, it shall be treated as the
             default instantiation level for this DF.

             The InstantiationLevel information element describes a
             given level of resources to be instantiated within a
             deployment flavour in term of the number of VNFC instances
             to be created from each VDU.
             All the VDUs referenced in the level shall be part of the
             corresponding deployment flavour and their number shall
             be within the range (min/max) for this deployment flavour.";
          reference
            "GS NFV IFA011: Section 7.1.8.2 VnfDf information element";
          leaf id {
            type string;
            description
              "Uniquely identifies a level with the DF.";
            reference
              "GS NFV IFA011: Section 7.1.8.7 InstantiationLevel
               information element";
          }
          leaf description {
            type string;
            description
              "Human readable description of the instantiation level";
            reference
              "GS NFV IFA011: Section 7.1.8.7 InstantiationLevel
               information element";
          }
          list vdu-level {
            key "id";
            min-elements 1;
            description
              "Sets the number of instances for the VDU in this
               instantiation level.";
            reference
              "GS NFV IFA011: Section 7.1.8.7 InstantiationLevel
               information element";
            leaf id {
              type leafref {
                path "../../../../nfv:vdu/nfv:id";
              }
              description
                "Uniquely identifies a VDU.";
              reference
                "GS NFV IFA011: Section 7.1.8.9 VduLevel information
                 element";
            }
            leaf number-of-instances {
              type uint16;
              must ". <= ../../../../nfv:df/" +
                   "nfv:vdu-profile[id=current()/../nfv:id]/" +
                   "nfv:max-number-of-instances";
              must ". >= ../../../../nfv:df/" +
                   "nfv:vdu-profile[id=current()/../nfv:id]/" +
                   "nfv:min-number-of-instances";
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              default 1;
              description
                "Number of instances of VNFC based on this VDU to
                 deploy for this level.";
              reference
                "GS NFV IFA011: Section 7.1.8.9 VduLevel information
                 element";
            }
          }
          list scaling-info {
            key "id";
            description
              "The InstantiationLevel information element describes a
               given level of resources to be instantiated within a
               DF in term of the number of VNFC instances to be
               created from each VDU.";
            reference
              "GS NFV IFA011: Section 7.1.8.7 InstantiationLevel
               information element";
            leaf id {
              type leafref {
                path "../../../nfv:scaling-aspect/nfv:id";
              }
              description
                "Identifier of the scaling aspect.";
              reference
                "GS NFV IFA011: Section 7.1.8.8 ScaleInfo information
                 element";
            }
            leaf scale-level {
              type uint32;
              description
                "The scale level, greater than or equal to 0.";
              reference
                "GS NFV IFA011: Section 7.1.8.8 ScaleInfo information
                 element";
            }
          }
        }
        leaf default-instantiation-level {
          type leafref {
            path "../nfv:instantiation-level/nfv:id";
          }
          description
            "This attribute references the 'instantiationLevel'
             entry which defines the default instantiation level for
             this DF. It shall be present if there are multiple
             'instantiationLevel' entries.";
          reference
            "GS NFV IFA011: Section 7.1.8.2 VnfDf information
                 element";
        }
        leaf-list supported-operation {
          type identityref {
            base supported-operation;
          }
          description
            "Indicates which operations are available for this DF via
             the VNF LCM interface. Instantiate VNF, Query VNF and
             Terminate VNF are supported in all DF and therefore
             need not be included in this list.";
          reference
            "GS NFV IFA011: Section 7.1.8.2 VnfDf information
                 element";
        }
        container lcm-operations-configuration {
          description
            "This information element is a container for all
             attributes that affect the invocation of the VNF
             Lifecycle Management operations, structured by
             operation.";
          reference
            "GS NFV IFA011: Section 7.1.8.2 VnfDf information
             element";
          leaf instantiate-vnf-op-config {
            type string;
            description
              "Configuration parameters for the InstantiateVnf
               operation.";
            reference
              "GS NFV IFA011: Section 7.1.5.2
               VnfLcmOperationsConfiguration information element";
          }
          container scale-vnf-op-config {
            description
              "Configuration parameters for the ScaleVnf operation.";
            reference
              "GS NFV IFA011: Section 7.1.5.2
               VnfLcmOperationsConfiguration information element";

            list parameter {
              key "key";
              leaf key {
                type string;
              }
              leaf value {
                type string;
              }
              description
                "VNF-specific parameter to be passed when invoking
                 the ScaleVnf operation.";
              reference
                "GS NFV IFA011: Section 7.1.5.4 ScaleVnfOpConfig
                 information element";
            }
            leaf scaling-by-more-than-one-step-supported {
              type boolean;
              default false;
              description
                "Signals whether passing a value larger than one in
                 the numScalingSteps parameter of the ScaleVnf
                 operation is supported by this VNF.
                 Default is FALSE, i.e. 'not supported'.";
              reference
                "GS NFV IFA011: Section 7.1.5.4
                 ScaleVnfOpConfig information element";
            }
          }
          container scale-vnf-to-level-op-config {
            description
              "This information element defines attributes that
               affect the invocation of the ScaleVnfToLevel
               operation.";
            reference
              "GS NFV IFA011: Section 7.1.5.2
               VnfLcmOperationsConfiguration information element";

            list parameter {
              key "key";
              leaf key {
                type string;
              }
              leaf value {
                type string;
              }
              description
                "VNF-specific parameter to be passed when invoking
                 the ScaleVnfToLevel operation.";
              reference
                "GS NFV IFA011: Section 7.1.5.5
                 ScaleVnfToLevelOpConfig information element";
            }
            leaf arbitrary-target-levels-supported {
              type boolean;
              description
                "Signals whether scaling according to the parameter
                 'scaleInfo' is supported by this VNF.";
              reference
                "GS NFV IFA011: Section 7.1.5.5
                 ScaleVnfToLevelOpConfig information element";
            }
          }
          container heal-vnf-op-config {
            description
              "This information element defines attributes that
               affect the invocation of the HealVnf operation.";
            reference
              "GS NFV IFA011: Section 7.1.5.2
               VnfLcmOperationsConfiguration information element";

            leaf parameter {
              type string;
              description
                "VNF-specific parameter to be passed when invoking
                 the HealVnf operation.";
              reference
                "GS NFV IFA011: Section 7.1.5.6 HealVnfOpConfig
                 information element";
            }
            leaf cause {
              type string;
              description
                "Supported 'cause' parameter values.";
              reference
                "GS NFV IFA011: Section 7.1.5.6 HealVnfOpConfig
                 information element";
            }
          }
          container terminate-vnf-op-config {
            description
              "This information element defines attributes that
               affect the invocation of the TerminateVnf operation.";
            reference
              "GS NFV IFA011: Section 7.1.5.2
               VnfLcmOperationsConfiguration information element";
            leaf min-graceful-termination {
              type yang:timeticks;
              description
                "Minimum timeout value for graceful termination of
                 a VNF instance.";
              reference
                "GS NFV IFA011: Section 7.1.5.7
                 TerminateVnfOpConfig information element";
            }
            leaf max-recommended-graceful-termination {
              type yang:timeticks;
              description
                "Maximum recommended timeout value that can be needed
                 to gracefully terminate a VNF instance of a
                 particular type under certain conditions, such as
                 maximum load condition. This is provided by VNF
                 provider as information for the operator
                 facilitating the selection of optimal timeout value.
                 This value is not used as constraint.";
              reference
                "GS NFV IFA011: Section 7.1.5.7
                 TerminateVnfOpConfig information element";
            }
          }
          container operate-vnf-op-config {
            description
              "This information element defines attributes that
               affect the invocation of the OperateVnf operation.";
            reference
              "GS NFV IFA011: Section 7.1.5.2
               VnfLcmOperationsConfiguration information element";

            leaf min-graceful-stop-timeout {
              type yang:timeticks;
              description
                "Minimum timeout value for graceful stop of a VNF
                 instance.";
              reference
                "GS NFV IFA011: Section 7.1.5.8
                 OperateVnfOpConfig information element";
            }
            leaf max-recommended-graceful-stop-timeout {
              type yang:timeticks;
              description
                "Maximum recommended timeout value that can be
                 needed to gracefully stop a VNF instance of a
                 particular type under certain conditions, such as
                 maximum load condition. This is provided by VNF
                 provider as information for the operator facilitating
                 the selection of optimal timeout value. This value
                 is not used as constraint.";
              reference
                "GS NFV IFA011: Section 7.1.5.8
                 OperateVnfOpConfig information element";
            }
          }
        }
        list affinity-or-anti-affinity-group {
          key "id";
          description
            "The AffinityOrAntiAffinityGroup describes the affinity
             or anti-affinity relationship applicable between the
             virtualization containers to be created based on
             different VDUs, or between internal VLs to be created
             based on different VnfVirtualLinkDesc(s).

             Per VNF, the affinity/anti-affinity rules defined using
             this information element, using the
             LocalAffinityOrAntiAffinityRule information element, and
             using the placement constraints in the
             GrantLifecycleOperation as defined in ETSI GS NFV-IFA
             007 [i.3] should be conflict-free. In case of conflicts,
             the placement constraints in the
             GrantLifecycleOperation shall take precedence.";

          reference
            "GS NFV IFA011: Section 7.1.8.2 VnfDf information
             element";

          leaf id {
            type string;
            description
              "Identifies an affinity or anti-affinity group to which
               the affinity or anti-affinity rule applies.";
            reference
              "GS NFV IFA011: Section 7.1.8.12
               AffinityOrAntiAffinityGroup information element";
          }

          leaf type {
            mandatory true;
            type affinity-type;
            description
              "Specifies whether the rule is an affinity rule or an
               anti-affinity rule.";
            reference
              "GS NFV IFA011: Section 7.1.8.12
               AffinityOrAntiAffinityGroup information element";
          }

          leaf scope {
            mandatory true;
            type affinity-scope;
            description
              "Specifies the scope of the rule, possible values are
               'NFVI-PoP', 'Zone', 'ZoneGroup', 'NFVI-node'.";
            reference
              "GS NFV IFA011: Section 7.1.8.12
               AffinityOrAntiAffinityGroup information element";
          }
        }
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        list indicator {
          key "id";

          leaf id {
            type string;
            description
              "Unique identifier.";
            reference
              "GS NFV IFA011: Section 7.1.11.2 VnfIndicator
               information element";
          }

          leaf name {
            type string;
            description
              "The human readable name of the VnfIndicator.";
            reference
              "GS NFV IFA011: Section 7.1.11.2 VnfIndicator
               information element";
          }

          leaf indicator-value {
            type string;
            description
              "Defines the allowed values or value ranges of this
               indicator.";
            reference
              "GS NFV IFA011: Section 7.1.11.2 VnfIndicator
               information element";
          }

          leaf source {
            type enumeration {
              enum vnf;
              enum em;
              enum both;
            }
            description
              "Describe the source of the indicator. The possible
               values are:
               • VNF.
               • EM.
               • Both.

               This tells the consumer where to send the subscription
               request.";
            reference
              "GS NFV IFA011: Section 7.1.11.2 VnfIndicator
               information element";
          }

          description
            "Declares the VNF indicators that are supported by this
             VNF (specific to this DF).";
          reference
            "GS NFV IFA011: Section 7.1.8.2 VnfDf information
             element";
        }

        list supported-vnf-interfaces {
          key "name";

          leaf name {
            type enumeration {
              enum vnf-configuration;
              enum vnf-indicator;
            }
            description
              "Identifies an interface produced by the VNF. Valid
               values:
               - VNF_CONFIGURATION
               - VNF_INDICATOR";
            reference
              "GS NFV IFA011: Section 7.1.8.16 VnfInterfaceDetails
               information element";
          }

          leaf-list cpd-id {
            type leafref {
              path "../../../ext-cpd/id";
            }
            description
              "References one or more CPDs from which to instantiate
               external CPs through which interface endpoints on the
               VNF side can be reached by the VNFM.";
            reference
              "GS NFV IFA011: Section 7.1.8.16 VnfInterfaceDetails
               information element";
          }

          list interface-details {
            key "key";

            leaf key {
              type string;
            }

            leaf value {
              type string;
            }
          }

          description
            "Indicates which interfaces the VNF produces and provides
             additional details on how to access the interface
             endpoints.";
          reference
            "GS NFV IFA011: Section 7.1.8.2 VnfDf information
             element";
        }

        list monitoring-parameter {
          key "id";

          description
            "Defines the virtualised resources monitoring parameters
             on VNF level.";
          reference
            "GS NFV IFA011: Section 7.1.8.2 VnfDf information
             element";

          leaf id {
            type string;
            description
              "Unique identifier of the monitoring parameter.";
            reference
              "GS NFV IFA011: Section 7.1.11.3 MonitoringParameter
               information element";
          }
          uses monitoring-parameter;
        }

        list scaling-aspect {
          key "id";

          description
            "The scaling aspects supported by this DF of the VNF.
             scalingAspect shall be present if the VNF supports
             scaling.";
          reference
            "GS NFV IFA011: Section 7.1.8.2 VnfDf information
             element";

          leaf id {
            type string;
            description
              "Unique identifier of this aspect in the VNFD.";
            reference
              "GS NFV IFA011: Section 7.1.10.2 ScalingAspect
               information element";
          }
          leaf name {
            type string;
            description
              "Human readable name of the aspect.";
            reference
              "GS NFV IFA011: Section 7.1.10.2 ScalingAspect
               information element";
          }
          leaf description {
            type string;
            description
              "Human readable description of the aspect.";
            reference
              "GS NFV IFA011: Section 7.1.10.2 ScalingAspect
               information element";
          }
          leaf max-scale-level {
            type uint32 {
              range "1..max";
              "The maximum scaleLevel for total number of scaling
               steps that can be applied w.r.t. this aspect. The
               value of this attribute corresponds to the number of
               scaling steps can be applied to this aspect when
               scaling it from the minimum scale level (i.e. 0) to the
               maximum scale level defined by this attribute.";
            reference
              "GS NFV IFA011: Section 7.1.10.2 ScalingAspect
               information element";
          }

          container aspect-delta-details {
            list deltas {
              key "id";
              min-elements 1;

              leaf id {
                type string;
                description
                  "Identifier of this scaling delta.";
                reference
                  "GS NFV IFA011: Section 7.1.10.4 ScalingDelta
                   information element";
              }

              list vdu-delta {
                key "id";

                leaf id {
                  type leafref {
                    path "/nfv/vnfd/vdu/id";
                  }
                  description
                    "Uniquely identifies a VDU.";
                  reference
                    "GS NFV IFA011: Section 7.1.8.9 VduLevel
                     information element";
                }

                leaf number-of-instances {
                  type uint32 {
                    range "0..max";
                  }
                  description
                    "Number of instances of VNFC based on this VDU to
                     deploy for an instantiation level or for a