etsi-nfv-ns.yang 49.2 KB
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submodule etsi-nfv-ns {
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  yang-version 1.1;
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  belongs-to etsi-nfv {
    prefix nfv;
  }

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  include etsi-nfv-common;
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  include etsi-nfv-vnf;
  include etsi-nfv-pnf;

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  description
    "Models for NS according to ETSI GS NFV-IFA 014.";

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  revision 2019-03-18 {
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    description
      "Initial revision
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       Common data structure to support NSD according to:
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       ETSI GS NFV-IFA 014 Ed261v252";
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    reference
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      "ETSI GS NFV-IFA 014 Ed261v252";
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  }

  grouping resource-handle {
    leaf vim-id {
      type string;
    }
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    leaf resource-provider-id {
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      type string;
    }
    leaf resource-id {
      type string;
    }
  }

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  grouping nsd {
    list nsd {
      key "id";
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      leaf id {
        type string;
        description
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          "Identifier of this NSD information element. It Globally
           uniquely identifies an instance of the NSD.";
        reference
          "GS NFV IFA014: Section 6.2.2.2 Network Service Descriptor
           information element";
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      }
      leaf designer {
        type string;
        description
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          "Identifies the designer of the NSD.";
        reference
          "GS NFV IFA014: Section 6.2.2.2 Network Service Descriptor
           information element";
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      }
      leaf version {
        type string;
        description
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          "Identifies the version of the NSD.";
        reference
          "GS NFV IFA014: Section 6.2.2.2 Network Service Descriptor
           information element";
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      }
      leaf name {
        type string;
        description
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          "Provides the human readable name of the NSD.";
        reference
          "GS NFV IFA014: Section 6.2.2.2 Network Service Descriptor
           information element";
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      }
      leaf invariant-id {
        type string;
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        description
          "Identifies an NSD in a version independent manner. This
           attribute is invariant across versions of the network
           service descriptor.";
        reference
          "GS NFV IFA014: Section 6.2.2.2 Network Service Descriptor
           information element";
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      }

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      leaf-list nested-nsd-id {
        must ". != ../id";
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        type leafref {
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          path "../../nsd/id";
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        }
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        description
          "References the NSD of a constituent nested NS.";
        reference
          "GS NFV IFA014: Section 6.2.2.2 Network Service Descriptor
           information element";
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      }

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      leaf-list vnfd-id {
        type leafref {
          path "../../vnfd/id";
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        }
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        description
          "References the VNFD of a constituent VNF.";
        reference
          "GS NFV IFA014: Section 6.2.2.2 Network Service Descriptor
           information element";
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      }
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      leaf-list pnfd-id {
	type leafref {
	  path "../../pnfd/id";
	}
        description
          "References the PNFD of a constituent PNF.";
        reference
          "GS NFV IFA014: Section 6.2.2.2 Network Service Descriptor
           information element";
      }

      list sapd {
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        key "id";
        description
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          "Provides the descriptor of a service access point of the
           network service.";
        reference
          "GS NFV IFA014: Section 6.2.2.2 Network Service Descriptor
           information element";

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        leaf id {
          type string;
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          description
            "Identifier of this Cpd information element.";
          reference
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            "GS NFV IFA014: Section 6.6.3.1 Cpd information element";
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        }

        leaf address-assignment {
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          type boolean;
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          description
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            "Specify whether the SAP address assignment is under the
             responsibility of management and orchestration functions
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             or not. If it is set to True, management and
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             orchestration functions are responsible for assigning
             addresses to the access points instantiated from this
             SAPD.";
          reference
            "GS NFV IFA014: Section 6.2.3.2 Sapd information element";
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        }
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        leaf virtual-link-desc {
          type leafref {
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            path "../../virtual-link-desc/id";
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          }
          description
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            "References the descriptor of the NS VL instance to
             which the SAP instantiated from this SAPD connects to.";
          reference
            "GS NFV IFA014: Section 6.2.3.2 Sapd information element";
        }

        choice associated-cpd-id {
          container vnf {
            leaf vnfd-id {
              mandatory true;
              type leafref {
                path "../../../../nfv:vnfd/nfv:id";
              }
              must "boolean(../../../vnfd-id[.=current()])";
            }

            leaf ext-cpd-id {
              mandatory true;
              type leafref {
                path "deref(../vnfd-id)/../nfv:ext-cpd/nfv:id";
              }
            }
          }
          container pnf {
            leaf pnfd-id {
              mandatory true;
                type leafref {
                path "../../../../nfv:pnfd/nfv:id";
              }
              must "boolean(../pnfd-id[.=current()])";
            }

            leaf ext-cpd-id {
              mandatory true;
              type leafref {
                path "deref(../pnfd-id)/../nfv:ext-cpd/nfv:id";
              }
            }
          }
          container ns {
            leaf nsd-id {
            mandatory true;
              type leafref {
                path "../../../../nfv:nsd/nfv:id";
              }
              must "boolean(../nsd-id[.=current()])";
	    }

            leaf ext-cpd-id {
              mandatory true;
              type leafref {
                path "deref(../nsd-id)/../nfv:sapd/nfv:id";
              }
            }
          }
        }
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      }
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      list virtual-link-desc {
        key "id";
        description
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          "Provides the constituent VLDs.";
        reference
          "GS NFV IFA014: Section 6.2.2.2 Network Service Descriptor
           information element";
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        leaf id {
          type string;
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          description
            "Identifier of the NsVirtualLinkDesc information element.
             It uniquely identifies a VLD.";
          reference
            "GS NFV IFA014: Section 6.5.2.2 NsVirtualLinkDesc
             information element";
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        }
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        uses connectivity-type;
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        list df {
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          key "id";
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          description
            "The VirtualLinkDf information element specifies
             properties for instantiating a VL according to a
             specific flavour.";
          reference
            "GS NFV IFA014: Section 6.5.2.2 NsVirtualLinkDesc
             information element";

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          leaf id {
            type string;
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            description
              "Identifies this VirtualLinkDf information element
               within a VLD.";
            reference
              "GS NFV IFA014: Section 6.5.4.2 VirtualLinkDf
               information element";
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          }

          container qos {
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            description
              "The QoS information element specifies quality of
               service parameters applicable to a VL.";
            reference
              "GS NFV IFA014: Section 6.5.4.2 VirtualLinkDf
               information element";

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            leaf latency {
              mandatory true;
              type uint32;
              units "ms";
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              description
                "Specifies the maximum latency in ms.";
              reference
                "GS NFV IFA014: Section 6.5.6.2 QoS information
                 element";
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            }

            leaf packet-delay-variation {
              mandatory true;
              type uint32;
              units "ms";
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              description
                "Specifies the maximum jitter in ms.";
              reference
                "GS NFV IFA014: Section 6.5.6.2 QoS information
                 element";
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            }

            leaf packet-loss-ratio {
              type decimal64 {
                fraction-digits "2";
                range "0..1.00";
              }
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              description
                "Specifies the maximum packet loss ratio.";
              reference
                "GS NFV IFA014: Section 6.5.6.2 QoS information
                 element";
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            }
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            leaf priority {
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              type uint32;
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              description
                "Specifies the priority level in case of
                 congestion on the underlying physical links.";
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              reference
                "GS NFV IFA014: Section 6.5.6.2 QoS information
                 element";
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            }
          }
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          leaf service-availability-level {
            type enumeration {
              enum "level-1";
              enum "level-2";
              enum "level-3";
            }
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            description
              "Specifies one of the three levels defined in ETSI
               ETSI GS NFV-REL 001 [i.5]
                 * Level 1.
                 * Level 2.
                 * Level 3.";
            reference
              "GS NFV IFA014: Section 6.5.4.2 VirtualLinkDf
               information element";
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          }
        }

        leaf test-access {
          type enumeration {
            enum none;
            enum passive-monitoring;
            enum active;
          }
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          description
            "Specifies test access facilities expected on the VL.";
          reference
            "GS NFV IFA014: Section 6.5.2.2 NsVirtualLinkDesc
             information element";
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        }

        leaf description {
          type string;
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          description
            "Provides human-readable information on the purpose of
             the virtual link (e.g. VL for control plane traffic).";
          reference
            "GS NFV IFA014: Section 6.5.2.2 NsVirtualLinkDesc
             information element";
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        }
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        uses security-parameters;
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      }
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      list vnffgd {
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        key "id";
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        description
          "Provides the descriptors of the applicable forwarding
           graphs.";
        reference
          "GS NFV IFA014: Section 6.2.2.2 Network Service Descriptor
           information element";

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        leaf id {
          type string;
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          description
            "Identifier of this Vnffgd information element. It
             uniquely identifies a VNFFGD.";
          reference
            "GS NFV IFA014: Section 6.4.2.2 Vnffgd information
             element";
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        }

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        leaf-list vnf-profile-id {
          type leafref {
            path "../../df/vnf-profile/id";
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          }
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          description
            "References the VnfProfile of a constituent VNF.";
          reference
            "GS NFV IFA014: Section 6.4.2.2 Vnffgd information
             element";
        }

        leaf-list pnf-profile-id {
          type leafref {
            path "../../df/pnf-profile/id";
          }
          description
            "References the PnfProfile of a constituent PNF.";
          reference
            "GS NFV IFA014: Section 6.4.2.2 Vnffgd information
             element";
        }

        leaf-list nested-ns-profile-id {
          type leafref {
            path "../../df/ns-profile/id";
          }
          description
            "References the NsProfile of a nestedNS.";
          reference
            "GS NFV IFA014: Section 6.4.2.2 Vnffgd information
             element";
        }

        leaf virtual-link-profile-id {
          type leafref {
            path "../../df/virtual-link-profile/id";
          }
          description
            "References the Virtual Link Profile of a constituent
             VL.";
          reference
            "GS NFV IFA014: Section 6.4.2.2 Vnffgd information
             element";
        }

        list cpd-pool {
          key "id";

          description
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            "Describes 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.";
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          reference
            "GS NFV IFA014: Section 6.4.2.2 Vnffgd information
             element";

          leaf id {
            type string;
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          }

          choice constituent-base-element-id {
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            mandatory "true";
            container vnf-profile {
              leaf vnf-profile-id {
                must ". = deref(../../vnfd-profile-id)" {
                }
                type leafref {
                  path "/nfv/nsd/df/vnf-profile/id";
                }
              }
            }
            container pnf-profile {
              leaf pnf-profile-id {
                must ". = deref(../../pnfd-profile-id)" {
                }
                type leafref {
                  path "/nfv/nsd/df/pnf-profile/id";
                }
              }
            }
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	    container ns-profile {
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              leaf ns-profile-id {
                must ". = deref(../../ns-profile-id)" {
                }
                type leafref {
                  path "/nfv/nsd/df/ns-profile/id";
                }
              }
            }
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            description
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              "Reference to the profile of an NS constituent.";
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            reference
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              "GS NFV IFA014: Section 6.4.8 CpdInConstituentElement
               information element";
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          }

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          choice constituent-cpd-id {
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            container vnf {
              leaf vnfd-id {
                must ". = deref(../../vnfd-profile-id)/../vnfd-id" {
                }
                type leafref {
                  path "/nfv/vnfd/id";
                }
              }
              leaf cpd-id {
                type leafref {
                  path "deref(../vnfd-id)/../nfv:ext-cpd/nfv:id";
                }
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              }
            }
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            container pnf {
              leaf pnfd-id {
                must ". = deref(../../pnfd-profile-id)/../pnfd-id" {
                }
                type leafref {
                  path "/nfv/pnfd/id";
                }
              }
              leaf pnf-cpd-id {
                type leafref {
                  path "deref(../pnfd-id)/../nfv:ext-cpd/nfv:id";
                }
              }
            }
            container ns {
              leaf nsd-id {
                must ". = deref(../../ns-profile-id)/../nsd-id" {
                }

                type leafref {
                  path "/nfv/nsd/id";
                }
              }
              leaf sap-cpd-id {
                type leafref {
                  path "deref(../nsd-id)/../nfv:sapd/nfv:id";
                }
              }
            }
            description
              "A reference to the descriptor of a connection point
               attached to one of the constituent VNFs and PNFs or to
               the descriptor of a NS SAP.";
            reference
              "GS NFV IFA014: Section 6.4.4.2 CpdPool information
               element";
          }
        }

        list nfpd {
          key "id";

          description
            "The network forwarding path associated to the VNFFG.";
          reference
            "GS NFV IFA014: Section 6.4.2.2 Vnffgd information
             element";

          leaf id {
            type string;
            description
              "Identifies this nfpd information element within a
               VNFFGD.";
            reference
              "GS NFV IFA014: Section 6.4.3.2 Nfpd information
               element";
          }

          leaf rule {
            type string;
            description
              "Provides an NFP classification and selection rule.
               The rule may be expressed as a criteria constructed
               out of atomic assertions linked by Boolean operators
               AND, OR and NOT.";
            reference
              "GS NFV IFA014: Section 6.4.3.2 Nfpd information
               element";
          }

          list position-desc-id {
            key "id";

            description
              "Describes a position in the NFP in terms of one or
               more CP profiles and rules for distributing the
               traffic among CP and SAP instances created from the
               CPD or SAPD associated to these profiles. This shall
               be connection point profile, which is either a CPD
               associated with the VnfProfile of a constituent VNF,
               or a CPD associated with the PnfProfile of a
               constituent PNF, or a SAPD associated with the
               NsProfile of a nested NS. The related VnfProfile,
               PnfProfile and NsProfile shall be included in the
               parent VNFFGD.";
            reference
              "GS NFV IFA014: Section 6.4.3.2 Nfpd information
               element";

            leaf id {
              type string;
              description
                "Identifier of this NfpPositionDesc element.";
              reference
                "GS NFV IFA014: Section 6.4.5.2 NfpPositionDesc
                 information element";
            }

            list cp-profile-id {
              key "id";

              description
                "References the profile of a connection point to be
                 traversed by the traffic flows matching the criteria.
                 This shall be a connection point attached to one of
                 the constituent VNFs and PNFs of the parent VNFFG,
                 or a SAP of one of the constituent nested NSs of the
                 parent VNFFG.";
              reference
                "GS NFV IFA014: Section 6.4.5.2 NfpPositionDesc
                 information element";

              leaf id {
                type string;
                description
                  "Identifier of this CpProfile information element.
                   It uniquely identifies a CpProfile.";
                reference
                  "GS NFV IFA014: Section 6.4.6.2 CpProfile
                   information element";
              }

              list constituent-profile-elements {
                key "id";

                description
                  "Specifies the constituents of the CpProfile.";
                reference
                  "GS NFV IFA014: Section 6.4.6.2 CpProfile
                   information element";

                leaf id {
                  type string;
                  description
                    "Specifies the constituents of the CpProfile.";
                  reference
                    "GS NFV IFA014: Section 6.4.7.2
                     ConstituentProfileElements information element";
                }

                leaf cpd-id {
                  type string;
                  description
                    "References the VNF external CPD for a given
                     VnfProfile, or the PNF external CPD for a given
                     PnfProfile, or a NS SAPD for a give NsProfile
                     identified by the constituentBasedElementId.";
                  reference
                    "GS NFV IFA014: Section 6.4.7.2
                     ConstituentProfileElements information element";
                }
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              }
            }
          }
        }
      }
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      leaf-list autoscale-rule {
        type string;
      }
      list lifecycle-management-script {
        key "event";
        leaf event {
          type string;
        }
        leaf script {
          type string;
        }
      }
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      list df {
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        min-elements 1;
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        must "default-instantiation-level or " +
          "count(ns-instantiation-level) = 1" {
          error-message
            "default-instantiation-level must be present if there " +
            "multiple instantion-level";
          reference
            "GS NFV IFA014: Section 6.3.2.2 NsDf information element";
        }

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        key "id";
        description
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          "Identifies a DF within the scope of an NSD.";
        reference
          "GS NFV IFA014: Section 6.2.2.2 Network Service Descriptor
           information element";
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        leaf id {
          type string;
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          description
            "Identifies this NsDf information element. It identifies
             a NS DF within the NSD.";
          reference
            "GS NFV IFA014: Section 6.3.2.2 NsDf information element";
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        }

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        leaf flavour-key {
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          type leafref {
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            path "../monitored-info/id";
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          }
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          description
            "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.";
          reference
            "GS NFV IFA014: Section 6.3.2.2 NsDf information element";
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        }

        list vnf-profile {
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          must "min-number-of-instances <= max-number-of-instances";
          must "boolean(../../vnfd-id[.=current()/vnfd-id])" {
            error-message "VNFDs in the profile has to be listed as a " +
              "dependency of the network service " +
              "descriptor.";
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          }
          key "id";
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          description
            "VNF profile to be used for the NS flavour.";
          reference
            "GS NFV IFA014: Section 6.3.2.2 NsDf information element";
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          leaf id {
            type string;
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            description
              "Identifier of this vnfProfile information element. It
               uniquely identifies a VnfProfile.";
            reference
              "GS NFV IFA014: Section 6.3.3.2 VnfProfile information
               element";
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          }

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          leaf vnfd-id {
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            mandatory true;
            type leafref {
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              path "/nfv/vnfd/id";
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            }
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            description
              "References a VNFD.";
            reference
              "GS NFV IFA014: Section 6.3.3.2 VnfProfile information
               element";
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          }

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          leaf flavour-id {
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            mandatory true;
            type leafref {
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              path "deref(../vnfd-id)/../df/id";
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            }
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            description
              "Identifies a flavour within the VNFD.";
            reference
              "GS NFV IFA014: Section 6.3.3.2 VnfProfile information
               element";
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          }

          leaf instantiation-level {
            mandatory true;
            type leafref {
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              path "deref(../flavour-id)/../instantiation-level/id";
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            }
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            description
              "Identifier of the instantiation level of the VNF DF
               to be used for instantiation. If not present, the
               default instantiation level as declared in the VNFD
               shall be used.";
            reference
              "GS NFV IFA014: Section 6.3.3.2 VnfProfile information
               element";
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          }

          leaf min-number-of-instances {
            mandatory true;
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            type uint16;
            description
              "Minimum number of instances of the VNF based on this
               VNFD that is permitted to exist for this VnfProfile.";
            reference
              "GS NFV IFA014: Section 6.3.3.2 VnfProfile information
               element";
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          }
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          leaf max-number-of-instances {
            mandatory true;
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            type uint16;
            description
              "Maximum number of instances of the VNF based on this
               VNFD that is permitted to exist for this VnfProfile.";
            reference
              "GS NFV IFA014: Section 6.3.3.2 VnfProfile information
               element";
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          }

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          uses local-affinity-or-anti-affinity-rule;
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          list affinity-or-anti-affinity-group {
            key "id";

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            description
              "Identifier(s) of the affinity or anti-affinity
               group(s) the VnfProfile belongs to.";
            reference
              "GS NFV IFA014: Section 6.3.3.2 VnfProfile information
               element";

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            leaf id {
              type leafref {
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                path "../../../affinity-or-anti-affinity-group/id";
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              }
            }
          }

          list virtual-link-connectivity {
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            key "virtual-link-profile-id";

            description
              "Defines the connection information of the VNF, it
               contains connection relationship between a VNF
               connection point and a NS Virtual Link.";
            reference
              "GS NFV IFA014: Section 6.3.3.2 VnfProfile information
               element";
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            leaf virtual-link-profile-id {
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              type leafref {
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                path "../../../virtual-link-profile/id";
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              }
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              description
                "Reference an NS VL profile.";
              reference
                "GS NFV IFA014: Section 6.3.7.2, NsVirutalLinkConnectivity
                 information element.";
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            }

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            list constituent-cpd-id {
              key "constituent-base-element-id";

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              description
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                "Describes a connection point on a VNF/PNF or a SAP
                 which connects to virtual links instantiated from
                 the profile identified in the virtualLinkProfileId
                 attribute.";
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              reference
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                "GS NFV IFA014: Section 6.3.7
                 NsVirtualLinkConnectivity information element";

              leaf constituent-base-element-id {
                type leafref {
                  path "../../../id";
                }
                description
                  "Reference to the profile of an NS constituent.";
                reference
                  "GS NFV IFA014: Section 6.4.8
                   CpdInConstituentElement information element";
              }

              leaf constituent-cpd-id {
                type leafref {
                  path "deref(../../../vnfd-id)/../nfv:ext-cpd/nfv:id";
                }
                description
                  "A reference to the descriptor of a connection point
                   attached to one of the constituent VNFs and PNFs or to
                   the descriptor of a NS SAP.";
                reference
                  "GS NFV IFA014: Section 6.4.4.2 CpdPool information
                   element";
              }
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            }
          }
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        }
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        list pnf-profile {
          key "id";
          must "boolean(../../pnfd-id[.=current()/pnfd-id])" {
            error-message "PNFDs in the profile has to be listed as a " +
              "dependency of the network service " +
              "descriptor.";
          }
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          leaf id {
            type string;
            description
              "Identifier of this PnfProfile information element.
               It uniquely identifies a PnfProfile.";
            reference
              "GS NFV IFA014: Section 6.3.6.2 PnfProfile information
               element";
          }

          leaf pnfd-id {
            type leafref {
              path "/nfv/pnfd/id";
            }
            description
              "References a PNFD.";
            reference
              "GS NFV IFA014: Section 6.3.6.2 PnfProfile information
               element";
          }

          list virtual-link-connectivity {
            key "virtual-link-profile-id";

            description
              "Defines the connection information of the PNF, it
               contains connection relationship between a PNF
               connection point and a NS Virtual Link.";
            reference
              "GS NFV IFA014: Section 6.3.6.2 PnfProfile information
               element";

            leaf virtual-link-profile-id {
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              type leafref {
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                path "../../../virtual-link-profile/id";
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              }
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              description
                "Reference an NS VL profile.";
              reference
                "GS NFV IFA014: Section 6.3.7.2, NsVirutalLinkConnectivity
                 information element.";
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            }

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            list constituent-cpd-id {
              key "constituent-base-element-id";

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              description
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                "Describes a connection point on a VNF/PNF or a SAP
                 which connects to virtual links instantiated from
                 the profile identified in the virtualLinkProfileId
                 attribute.";
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              reference
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                "GS NFV IFA014: Section 6.3.7
                 NsVirtualLinkConnectivity information element";

              leaf constituent-base-element-id {
                type leafref {
                  path "../../../id";
                }
                description
                  "Reference to the profile of an NS constituent.";
                reference
                  "GS NFV IFA014: Section 6.4.8
                   CpdInConstituentElement information element";
              }

              leaf constituent-cpd-id {
                type leafref {
                  path "deref(../../../pnfd-id)/../nfv:ext-cpd/nfv:id";
                }
                description
                  "A reference to the descriptor of a connection point
                   attached to one of the constituent VNFs and PNFs or to
                   the descriptor of a NS SAP.";
                reference
                  "GS NFV IFA014: Section 6.4.4.2 CpdPool information
                   element";
              }
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            }
          }
        }

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        list virtual-link-profile {
          key "id";

          description
            "VL profile to be used for the NS flavour.";
          reference
            "GS NFV IFA014: Section 6.3.2.2 NsDf information element";

          leaf id {
            type string;
            description
              "Uniquely identifies this VirtualLinkProfile
               information element.";
            reference
              "GS NFV IFA014: Section 6.3.2.2 VirtualLinkProfile
               information element";
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          }

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          leaf virtual-link-desc-id {
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            mandatory true;
            type leafref {
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              path "../../../virtual-link-desc/id";
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            }
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            description
              "Uniquely references a VLD.";
            reference
              "GS NFV IFA014: Section 6.3.2.2 VirtualLinkProfile
               information element";
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          }

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          leaf flavour-id {
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            mandatory true;
            type leafref {
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              path "deref(../virtual-link-desc-id)/../df/id";
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            }
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            description
              "Identifies a flavour within the VLD.";
            reference
              "GS NFV IFA014: Section 6.3.2.2 VirtualLinkProfile
               information element";
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          }

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          uses local-affinity-or-anti-affinity-rule;
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          list affinity-or-anti-affinity-group {
            key "id";

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            description
              "Identifies an affinity or anti-affinity group the
               VLs instantiated according to the VlProfile belong
               to.";
            reference
              "GS NFV IFA014: Section 6.3.4.2 VirtualLinkProfile
               information element";

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            leaf id {
              type leafref {
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                path "../../../affinity-or-anti-affinity-group/id";
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              }
            }
          }

          container max-bitrate-requirements {
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            description
              "Specifies the maximum bitrate requirements for a VL
               instantiated according to this profile.";
            reference
              "GS NFV IFA014: Section 6.3.4.2 VirtualLinkProfile
               information element";
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            uses link-bitrate-requirements;
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          }
          container min-bitrate-requirements {
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            description
              "Specifies the minimum bitrate requirements for a VL
               instantiated according to this profile.";
            reference
              "GS NFV IFA014: Section 6.3.4.2 VirtualLinkProfile
               information element";
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            uses link-bitrate-requirements;
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          }
        }

        list scaling-aspect {
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          key "id";

          description
            "The scaling aspects supported by this DF of the NS.";
          reference
            "GS NFV IFA014: Section 6.3.2.2 NsDf information element";

          leaf id {
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            type string;
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            description
              "Identifier of this NsScalingAspect information element.
               It uniquely identifies the NS scaling aspect in an
               NSD.";
            reference
              "GS NFV IFA014: Section 6.7.2.2 NsScalingAspect
               information element";
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          }
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          leaf name {
            type string;
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            description
              "Provides a human readable name of the NS scaling
               aspect.";
            reference
              "GS NFV IFA014: Section 6.7.2.2 NsScalingAspect
               information element";
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          }
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          leaf description {
            type string;
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            description
              "Provides a human readable description of the NS
               scaling aspect.";
            reference
              "GS NFV IFA014: Section 6.7.2.2 NsScalingAspect
               information element";
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          }
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          leaf scaling-level {
            type leafref {
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              path "../../ns-instantiation-level/id";
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            }
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            description
              "Describes the details of an NS level.";
            reference
              "GS NFV IFA014: Section 6.7.2.2 NsScalingAspect
               information element";
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          }
        }

        list affinity-or-anti-affinity-group {
          key "id";

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          description
            "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.";
          reference
            "GS NFV IFA014: Section 6.3.2.2 NsDf information element";

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          leaf id {
            type string;
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            description
              "Identifier of Identifier of this 
               AffinityOrAntiAffinityGroup information element.";
            reference
              "GS NFV IFA014: Section 6.3.5.2 AffinityOrAntiAffinity
               information element";
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          }

          leaf affinity-type {
            mandatory true;
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            type affinity-type;
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            description
              "Specifies the type of relationship that the members of
               the group have: 'affinity' or 'anti-affinity.'";
            reference
              "GS NFV IFA014: Section 6.3.5.2 AffinityOrAntiAffinity
               information element";
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          }

          leaf affinity-scope {
            mandatory true;
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            type affinity-scope;
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            description
              "Specifies the scope of the affinity or anti-affinity
               relationship e.g. a NFVI node, an NFVI PoP, etc.";
            reference
              "GS NFV IFA014: Section 6.3.5.2 AffinityOrAntiAffinity
               information element";
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          }
        }

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        list ns-instantiation-level {
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          min-elements 1;
          key "id";
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          description
            "Describes the details of an NS level.";
          reference
            "GS NFV IFA014: Section 6.3.2.2 NsDf information element
             GS NFV IFA014: Section 6.7.2.2 NsScaling information
             element";

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          leaf id {
            type string;
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            description
              "Identifier of this NsLevel information element. It
               uniquely identifies an NS level within the DF.";
            reference
              "GS NFV IFA014: Section 6.3.9.2 NsLevel information
               element";
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          }

          leaf description {
            type string;
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            description
              "Human readable description of the NS level.";
            reference
              "GS NFV IFA014: Section 6.3.9.2 NsLevel information
               element";
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          }

          list vnf-to-level-mapping {
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            key "vnf-profile-id";

            description
              "Specifies the profile of the VNFs involved in this NS
               level and, for each of them, the required number of
               instances.";
            reference
              "GS NFV IFA014: Section 6.3.9.2 NsLevel information
               element";
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            leaf vnf-profile-id {
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              type leafref {
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                path "../../../vnf-profile/id";
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              }
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              description
                "Identifies the profile to be used for a VNF
                 involved in an NS level.";
              reference
                "GS NFV IFA014: Section 6.7.4.2 VnfToLevelMapping
                 information element";
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            }

            leaf number-of-instances {
              mandatory true;
              type uint32;
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              description
                "Specifies the number of VNF instances required for
                 an NS level.";
              reference
                "GS NFV IFA014: Section 6.7.4.2 VnfToLevelMapping
                 information element";
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            }
          }

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          list virtual-link-to-level-mapping {
            key "virtual-link-profile-id";

            description
              "Specifies the profile of the VLs involved in this NS
               level and, for each of them, the needed bandwidth.";
            reference
              "GS NFV IFA014: Section 6.3.9.2 NsLevel information
               element";
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            leaf virtual-link-profile-id {
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              type leafref {
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                path "../../../virtual-link-profile/id";
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              }
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              description
                "Identifies the profile to be used for a VL involved
                 in an NS level.";
              reference
                "GS NFV IFA014: Section 6.7.5.2
                 VirtualLinkToLevelMapping information element";
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            }

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            uses link-bitrate-requirements;
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          }

          list ns-to-level-mapping {
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            key "ns-profile-id";

            description
              "Specifies the profile of the nested NSs involved in
               this NS level and, for each of them, the required
               number of instances.";
            reference
              "GS NFV IFA014: Section 6.3.9.2 NsLevel information
               element";

            leaf ns-profile-id {
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              type leafref {
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                path "../../../ns-profile/id";
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              }
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              description
                "Identifies the profile to be used for a nested NS
                 involved in the NS level.";
              reference
                "GS NFV IFA014: Section 6.7.6.2 NsToLevel information
                 element";
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            }

            leaf number-of-instances {
              mandatory true;
              type uint32;
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              description
                "Specifies the number of nested NS instances required
                 for the NS scale level.";
              reference
                "GS NFV IFA014: Section 6.7.6.2 NsToLevel information
                 element";
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          }
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          must "(count(vnf-to-level-mapping) + " +
            "count(virtual-link-to-level-mapping) + " +
            "count(ns-to-level-mapping)) > 0" {
            error-message "At least one attribute between " +
              "vnf-to-level-mapping, " +
              "virtual-link-to-level-mapping and " +
              "ns-to-level-mapping shall be present.";
            description
              "At least one attribute between vnfToLevelMapping,
              vlirtualLinkToLevelMapping and nsToLevelMapping shall
                be present.";
            reference
              "GS NFV IFA014: Section 6.3.9.2 NsLevel information
              element";
          }
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        }

        leaf default-instantiation-level {
          type leafref {
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            path "../ns-instantiation-level/id";
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          }
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          description
            "Identifies the NS level which represents the default NS
             instantiation level for this DF. It shall be present if
             there are multiple 'nsIinstantiationLevel' entries.";
          reference
            "GS NFV IFA014: Section 6.3.2.2 NsDf information element";
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        }

        list ns-profile {
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          must "min-number-of-instances <= max-number-of-instances" {
            error-message
              "min-number-of-instances has to be less than or equal" +
              "max-number-of-instances.";
          }
          must "boolean(../../nested-nsd-id[.=current()/nsd-id])" {
            error-message "PNFDs in the profile has to be listed as a " +
              "dependency of the network service " +
              "descriptor.";
          }
          key "id";

          description
            "Specifies a NS Profile supported by this NS DF.";
          reference
            "GS NFV IFA014: Section 6.3.2.2 NsDf information element";

          leaf id {
            type string;
            description
              "Identifies an NS profile.";
            reference
              "GS NFV IFA014: Section 6.3.11.2 NsProfile information
               element";
          }
          leaf nsd-id {
            mandatory true;
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            type leafref {
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              path "/nfv/nsd/id";
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            }
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            description
              "Identifies the NSD applicable to NS instantiated
               according to this profile.";
            reference
              "GS NFV IFA014: Section 6.3.11.2 NsProfile information
               element";
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          }
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          leaf ns-df-id {
            mandatory true;
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            type leafref {
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              path "deref(../nsd-id)/../df/id";
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            }
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            description
              "Identifies the applicable network service DF within
               the scope of the NSD.";
            reference
              "GS NFV IFA014: Section 6.3.11.2 NsProfile information
               element";
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          }
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          leaf instantiation-level-id {
            mandatory true;
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            type leafref {
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              path "deref(../ns-df-id)/../ns-instantiation-level/id";
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            }
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            description
              "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.";
            reference
              "GS NFV IFA014: Section 6.3.11.2 NsProfile information
               element";
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          }
          leaf min-number-of-instances {
            type uint16;
            mandatory true;
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            description
              "Minimum number of nested NS instances based on the
               referenced NSD that is permitted to exist for this
               NsProfile.";
            reference
              "GS NFV IFA014: Section 6.3.11.2 NsProfile information
               element";
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          }
          leaf max-number-of-instances {
            type uint16;
            mandatory true;
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            description
              "Maximum number of nested NS instances based on the
               referenced NSD that is permitted to exist for this
               NsProfile.";
            reference
              "GS NFV IFA014: Section 6.3.11.2 NsProfile information
               element";
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          }
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          list affinity-or-anti-affinity-group-id {
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            key "id";

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            description
              "Identifies an affinity or anti-affinity group the NSs
               created according to this NsProfile belongs to.";
            reference
              "GS NFV IFA014: Section 6.3.11.2 NsProfile information
               element";

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            leaf id {
              type leafref {
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                path "../../../affinity-or-anti-affinity-group/id";
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              }
            }
          }
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          list virtual-link-connectivity {
            key "virtual-link-profile-id";

            leaf virtual-link-profile-id {
              type leafref {
                path "../../../virtual-link-profile/id";
              }
              description
                "Reference an NS VL profile.";
              reference
                "GS NFV IFA014: Section 6.3.7.2, NsVirutalLinkConnectivity
                 information element.";
            }
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            list constituent-cpd-id {
              key "constituent-base-element-id";

              description
                "Describes a connection point on a VNF/PNF or a SAP
                 which connects to virtual links instantiated from
                 the profile identified in the virtualLinkProfileId
                 attribute.";
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              reference
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                "GS NFV IFA014: Section 6.3.7
                 NsVirtualLinkConnectivity information element";

              leaf constituent-base-element-id {
                type leafref {
                  path "../../../id";
                }
                description
                  "Reference to the profile of an NS constituent.";
                reference
                  "GS NFV IFA014: Section 6.4.8
                   CpdInConstituentElement information element";
              }

              leaf constituent-cpd-id {
                type leafref {
                  path "deref(../../../nsd-id)/../nfv:sapd/nfv:id";
                }
                description
                  "A reference to the descriptor of a connection point
                   attached to one of the constituent VNFs and PNFs or to
                   the descriptor of a NS SAP.";
                reference
                  "GS NFV IFA014: Section 6.4.4.2 CpdPool information
                   element";
              }
            }
	  }
	}
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        list dependencies {
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          key "id";
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          description
            "Specifies the order in which instances of the VNFs and/or
             nested NSs have to be created.";
          reference
            "GS NFV IFA014: Section 6.3.2.2 NsDf information element";