module bbf-onu-management-proxy {

    yang-version 1.1;

    namespace
      "urn:bbf:yang:bbf-onu-management-proxy";

    prefix bbf-onu-mgmt-p;

    import bbf-network-function {
      prefix bbf-nf;
    }
    import bbf-network-function-client {
      prefix bbf-nfc;
    }
    import bbf-network-function-server {
      prefix bbf-nfs;
    }
    import bbf-network-function-types {
      prefix bbf-nft;
    }
    import bbf-voltmf-common {
      prefix bbf-voltmf-c;
    }
    import bbf-voltmf-message-monitor {
      prefix bbf-voltmf-msg-mon;
    }
    import bbf-vomci-common {
      prefix bbf-vomci-c;
    }
    import bbf-vomci-types {
      prefix bbf-vomcit;
    }
    import bbf-yang-types {
      prefix bbf-yang;
    }
    import ietf-yang-schema-mount {
      prefix yangmnt;
    }

    organization
      "Broadband Forum <https://www.broadband-forum.org>
SDN/NFV Work Area";

    contact
      "Comments or questions about this Broadband Forum YANG module
should be directed to <mailto:help@broadband-forum.org>.

Editor:      Tim Carey, Nokia

Editor:      Jeff Hartley, Commscope

WA Director: Mengmeng Li, China Mobile

WA Director: Bruno Cornaglia, Vodafone";

    description
      "This module contains a collection of YANG definitions for
supporting the Broadband Forum requirements for ONU
Management Proxy functionality as described in TR-451.

Copyright (c) 2019-2022, Broadband Forum

Redistribution and use in source and binary forms, with or
without modification, are permitted provided that the following
conditions are met:

1. Redistributions of source code must retain the above copyright
   notice, this list of conditions and the following disclaimer.

2. Redistributions in binary form must reproduce the above
   copyright notice, this list of conditions and the following
   disclaimer in the documentation and/or other materials
   provided with the distribution.

3. Neither the name of the copyright holder nor the names of its
   contributors may be used to endorse or promote products
   derived from this software without specific prior written
   permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

The above license is used as a license under copyright only.
Please reference the Forum IPR Policy for patent licensing terms
<https://www.broadband-forum.org/ipr-policy>.

Any moral rights which are necessary to exercise under the above
license grant are also deemed granted under this license.

This version of this YANG module is part of TR-451; see
the TR itself for full legal notices.";

    revision "2022-06-07" {
      description
        "Issue 1.
* Approval Date:    2022-06-07.
* Publication Date: 2022-06-07.";
      reference
        "TR-451: vOMCI Specification
        	<https://www.broadband-forum.org/technical/download/
        		 TR-451_Issue-1.pdf>";

    }


    feature nf-client {
      description
        "Indicates that client connectivity to network function
endpoints is supported.";
    }

    feature nf-server {
      description
        "Indicates that server connectivity to network function
endpoints is supported.";
    }

    container onu-management-proxy {
      description
        "Data nodes associated with the ONU Management Proxy.";
      leaf message-timeout {
        type uint16 {
          range "10..max";
        }
        units "seconds";
        default "900";
        description
          "The maximum number of seconds for a response to be received
to a transmitted message. The timeout is used to clean up
stale messages.";
      }

      container nf-topology {
        description
          "The VNFs, VNF instances and network function links that
cannot be discovered.

The network function has knowledge of:
  VNFs: vOMCI Function, vOMCI Proxy, ONU Management Proxy
  VNF Instances and links of Network Functions:
    vOMCI function, vOMCI Proxy, OLT.";
        leaf type {
          type identityref {
            base bbf-nft:nf-topology;
          }
          description
            "The type of deployment topology used by this network
function.";
        }

        leaf other-type {
          when
            "derived-from-or-self(../type,'bbf-nft:other-topology')" {
            description
              "Only valid when the topology type is 'other-topology'.";
          }
          type bbf-yang:string-ascii64;
          description
            "The other type of deployment topology used by this network
function, when 'type' is set to 'other-topology'.";
        }

        list vnf {
          key "name";
          description
            "Data nodes describing the VNF 'flavor' (not instance) being
used. For example, vendor or version info.";
          leaf name {
            type bbf-yang:string-ascii64;
            description
              "The VNF 'flavor' (not instance) being used.";
          }

          leaf vendor {
            type bbf-yang:string-ascii64;
            description
              "The vendor of the VNF.";
          }

          leaf software-version {
            type bbf-yang:string-ascii64;
            description
              "The software version of VNF.";
          }

          leaf nf-type {
            type identityref {
              base bbf-nft:vnf-type;
            }
            mandatory true;
            description
              "The type of the VNF within the solution context.
For example: ONU-Management-Proxy, vOMCI-function,
vOMCI-Proxy.";
          }
        }  // list vnf

        list vnf-instance {
          key "name";
          description
            "An instance of a VNF.";
          leaf name {
            type bbf-yang:string-ascii64;
            description
              "The name of the instance.";
          }

          leaf vnf {
            type leafref {
              path "../../vnf/name";
            }
            mandatory true;
            description
              "The VNF 'flavor' (not instance) being used.";
          }

          container data {
            yangmnt:mount-point "device-yang-library" {
              description "The YANG library associated with the device.";
            }
            description
              "The data nodes of the device's schema.";
          }  // container data
        }  // list vnf-instance

        list nf-link {
          key "name";
          description
            "A link to a network function. Depending on usage, this may
be to a physical or virtual NF, and may be one-ended or
two-ended.";
          leaf name {
            type bbf-yang:string-ascii64;
            description
              "The name of the link to the network function.";
          }

          list endpoint {
            key "nf-instance endpoint";
            max-elements 2;
            description
              "An endpoint at the network function.";
            leaf nf-instance {
              type bbf-yang:string-ascii64;
              description
                "The name of the instance of the network function at the
remote end of the link.

If the function is a PNF, then this value is the
device identifier of the PNF.";
            }

            leaf endpoint {
              type bbf-yang:string-ascii64;
              description
                "The name of the endpoint at the network function.";
            }

            leaf nf-type {
              type bbf-yang:string-ascii64;
              description
                "The type of the network function endpoint.";
            }
          }  // list endpoint
        }  // list nf-link
      }  // container nf-topology

      container onu-vomci-assignment-policy {
        description
          "The policy rules to use to associate an ONU with a list of
vOMCI functions.";
        list rule {
          key "name";
          ordered-by user;
          description
            "A rule to assign an ONU to vOMCI function types.

A rule contains a classification of resources that match a
criteria. The result is a list of vOMCI function types.

The rule is applied for a given ONU according to priority,
then list order as defined by the client for equal
priorities. Once a match is achieved, the search is
terminated and the list of vOMCI functions applied.";
          leaf name {
            type bbf-yang:string-ascii64;
            description "The rule name.";
          }

          leaf priority {
            type uint16 {
              range "1..max";
            }
            mandatory true;
            description
              "Indicates the priority for applying the match criteria of
this rule against the priority of match criteria of other
rules in this filter.

The higher the value, the lower the priority, i.e.
priority 1 is the highest priority.";
          }

          container match-criteria {
            description
              "Match criteria for ONU assignment policies. Specific match
criteria shall be provided using augments in a context
dependent way, e.g. match criteria can be augmented for
ONUs, or in another context match criteria can be
augmented for another resource.";
            leaf criteria-type {
              type identityref {
                base bbf-vomcit:onu-vomci-criteria;
              }
              default "bbf-vomcit:any-onu";
              description
                "The type of ONU vOMCI selection criteria to apply to
this rule.";
            }

            leaf onu-vendor {
              when
                "../criteria-type = 'bbf-vomcit:onu-vendor'";
              type bbf-vomcit:onu-vendor-id;
              mandatory true;
              description
                "ONU vendor as defined in the TC layer ONU-ID.";
            }

            leaf onu-software-version {
              when
                "(../criteria-type = 'bbf-vomcit:onu-vendor') or
(../criteria-type =
'bbf-vomcit:onu-software-version')";
              type bbf-vomcit:onu-software-version;
              mandatory true;
              description
                "ONU vendor's software version.";
            }
          }  // container match-criteria

          leaf-list vomci-function {
            type bbf-yang:string-ascii64;
            min-elements 1;
            description
              "Data nodes describing the VNF 'flavor' (not instance) being
used for the ONU. For example, vendor or version info.";
          }
        }  // list rule
      }  // container onu-vomci-assignment-policy

      container remote-nf {
        presence
          "Enables access to remote network functions";
        description
          "The remote network function (NF) configuration.";
        container nf-client {
          if-feature bbf-onu-mgmt-p:nf-client;
          description
            "Client network function configuration.";
          leaf enabled {
            type boolean;
            default "true";
            description
              "Administratively enable the use of client connectivity
capability to connect to network function endpoints.";
          }

          container initiate {
            description
              "Configures client initiating underlying connections. If
there are multiple remote-servers, they may be
connected to in parallel.";
            list remote-server {
              key "name";
              description
                "A remote server the client will connect to.";
              leaf name {
                type bbf-yang:string-ascii64;
                description
                  "An arbitrary name for the remote server.";
              }

              leaf nf-type {
                type identityref {
                  base bbf-nft:nf-type;
                }
                description
                  "The type of remote communication endpoint
(e.g, vOMCI-proxy, vOMCI-function, vOLTMF, OLT).";
              }

              leaf on-demand {
                type boolean;
                default "false";
                description
                  "Determines whether the client establishes a
connection to the endpoint only on-demand ('true')
or is establishes a connection permanently
('false').";
              }

              leaf local-service-endpoint {
                type bbf-yang:string-ascii64;
                description
                  "The name that the NF will use when reporting the
NF as an endpoint. For example, see sections
5.8.2.1 Hello vOMCI service and 5.7.1.2.1.1 Hello
Message (service-endpoint-name) in TR-451 for how
this parameter is used for vOMCI communication.";
                reference
                  "TR-451: vOMCI Specification, sections 5.8.2.1,
                  5.7.1.2.1.1";

              }

              choice transport {
                mandatory true;
                description
                  "Selects between available client transports.";
                case grpc {
                  description
                    "Selection for gRPC client transport.";
                  container grpc-client {
                    if-feature bbf-grpcc:grpc-client;
                    description
                      "A wrapper around the gRPC client parameters to avoid name
collisions.";
                    container channel {
                      description
                        "The gRPC channel properties.";
                      leaf ping-interval {
                        type uint32 {
                          range "0..max";
                        }
                        units "seconds";
                        default "300";
                        description
                          "Sets the amount of time after which a ping request is sent.
A value of 0 disables pings from being sent.";
                      }
                    }  // container channel

                    container connection-backoff {
                      if-feature bbf-grpcc:connection-backoff;
                      description
                        "The connection backoff directs how a client reconnects to a
remote endpoint after discovering its connection to the
remote endpoint has dropped.";
                      reference
                        "github.com/grpc/grpc/blob/master/doc/connection-backoff.md.";

                      leaf enable {
                        type boolean;
                        default "true";
                        description
                          "If 'true', connection-backoff is enabled.";
                      }

                      leaf initial-backoff {
                        type uint16 {
                          range "1..max";
                        }
                        units "seconds";
                        default "30";
                        description
                          "The initial wait period after the first failure before
retrying.";
                      }

                      leaf min-connect-timeout {
                        type uint16 {
                          range "1..max";
                        }
                        units "seconds";
                        default "20";
                        description
                          "The minimum time to wait for the connection attempts.";
                      }

                      leaf multiplier {
                        type decimal64 {
                          fraction-digits
                            2;
                        }
                        default "1.60";
                        description
                          "The factor with which to multiply the backoff after a
failed retry.";
                      }

                      leaf jitter {
                        type decimal64 {
                          fraction-digits
                            2;
                        }
                        default "0.20";
                        description
                          "The factor with which to randomize the backoff.";
                      }

                      leaf max-backoff {
                        type uint16 {
                          range "1..max";
                        }
                        default "10";
                        description
                          "The number of times the client tries to connect to a
specific endpoint before moving on to the next endpoint
in the list (round robin).";
                      }
                    }  // container connection-backoff

                    list access-point {
                      key "name";
                      min-elements 1;
                      ordered-by user;
                      description
                        "A user-ordered list of access points that the client will
attempt to connect to in the specified sequence. Defining
more than one enables high-availability.";
                      leaf name {
                        type bbf-yang:string-ascii64;
                        description
                          "An arbitrary name for the access point.";
                      }

                      container grpc-transport-parameters {
                        description
                          "gRPC agent transport parameters.";
                        choice tcp-client-options {
                          description
                            "Replicate some pre-standard IETF client/server
options in-file, and provide a place to add IETF
client/server stack options post-standard in the
future.";
                          container remote-port {
                            description
                              "The remote port identified by a client.";
                            leaf remote-port {
                              type inet:port-number;
                              default "8443";
                              description
                                "The client will attempt to connect to the
common port value for 'grpc' (8443) if no
value is specified.";
                            }
                          }  // container remote-port
                        }  // choice tcp-client-options
                      }  // container grpc-transport-parameters

                      notification remote-endpoint-status-change {
                        description
                          "A notification traceable to a client remote-endpoint
and access-point. This notification is sent when a
remote-endpoint is connected or disconnected.";
                        leaf connected {
                          type boolean;
                          mandatory true;
                          description
                            "New remote-endpoint status.";
                        }

                        leaf last-changed {
                          type yang:date-and-time;
                          mandatory true;
                          description
                            "The system date and time when the remote-endpoint was
connected or disconnected.";
                        }
                      }  // notification remote-endpoint-status-change
                    }  // list access-point
                  }  // container grpc-client
                }  // case grpc

                case kafka {
                  description
                    "Selection for Kafka client transport.";
                  container kafka-agent {
                    if-feature bbf-kafkaa:kafka-agent;
                    description
                      "A wrapper around the Kafka agent parameters to avoid name
collisions.";
                    leaf client-id {
                      type string;
                      mandatory true;
                      description
                        "The identifier that the client/consumer (agent) uses
to identify the source of a message.";
                    }

                    container publication-parameters {
                      if-feature bbf-kafkaa:message-publication;
                      description
                        "The Kafka agent publication properties.";
                      list topic {
                        key "name";
                        description
                          "The topics the agent will publish.";
                        leaf name {
                          type string;
                          mandatory true;
                          description
                            "The name of the topic.";
                        }

                        leaf purpose {
                          type string;
                          description
                            "The purpose of the topic (e.g., VOMCI_NOTIFICATION,
VOMCI_REQUEST, VOMCI_RESPONSE).";
                        }

                        leaf partition {
                          type string;
                          description
                            "For topics that are partitioned, the partition used for
production and consumption.";
                        }
                      }  // list topic
                    }  // container publication-parameters

                    container consumption-parameters {
                      if-feature bbf-kafkaa:message-consumption;
                      description
                        "The Kafka agent consumption properties.";
                      leaf group-id {
                        type string;
                        mandatory true;
                        description
                          "The identifier of the group that the consumer can
participate in.";
                      }

                      list topic {
                        key "name";
                        description
                          "The topics the agent will consume.";
                        leaf name {
                          type string;
                          mandatory true;
                          description
                            "The name of the topic.";
                        }

                        leaf purpose {
                          type string;
                          description
                            "The purpose of the topic (e.g., VOMCI_NOTIFICATION,
VOMCI_REQUEST, VOMCI_RESPONSE).";
                        }

                        leaf partition {
                          type string;
                          description
                            "For topics that are partitioned, the partition used for
production and consumption.";
                        }
                      }  // list topic
                    }  // container consumption-parameters

                    list access-point {
                      key "name";
                      min-elements 1;
                      ordered-by user;
                      description
                        "A user-ordered list of access points that the client will
attempt to connect to in the specified sequence. Defining
more than one enables high-availability.";
                      leaf name {
                        type bbf-yang:string-ascii64;
                        description
                          "An arbitrary name for the access point.";
                      }

                      container kafka-agent-transport-parameters {
                        description
                          "Kafka agent transport parameters.";
                        choice tcp-client-options {
                          description
                            "Replicate some pre-standard IETF client/server
options in-file, and provide a place to add IETF
client/server stack options post-standard in the
future.";
                          container remote-port {
                            description
                              "The remote port identified by a client.";
                            leaf remote-port {
                              type inet:port-number;
                              default "9092";
                              description
                                "The client will attempt to connect to the
common port value for 'kafka' (9092) if no
value is specified.";
                            }
                          }  // container remote-port
                        }  // choice tcp-client-options
                      }  // container kafka-agent-transport-parameters

                      notification remote-endpoint-status-change {
                        description
                          "A notification traceable to a client remote-endpoint
and access-point. This notification is sent when a
remote-endpoint is connected or disconnected.";
                        leaf connected {
                          type boolean;
                          mandatory true;
                          description
                            "New remote-endpoint status.";
                        }

                        leaf last-changed {
                          type yang:date-and-time;
                          mandatory true;
                          description
                            "The system date and time when the
remote-endpoint was connected or disconnected.";
                        }
                      }  // notification remote-endpoint-status-change
                    }  // list access-point
                  }  // container kafka-agent
                }  // case kafka
              }  // choice transport
            }  // list remote-server
          }  // container initiate
        }  // container nf-client

        container nf-server {
          if-feature bbf-onu-mgmt-p:nf-server;
          description
            "Server network function configuration.";
          leaf enabled {
            type boolean;
            default "true";
            description
              "Administratively enable the use of server connectivity
capability to connect to network function endpoints.";
          }

          container listen {
            presence
              "Enables server to listen for client connections.";
            description
              "Configures listen behavior.";
            leaf idle-timeout {
              type uint16;
              units "seconds";
              default "3600";
              description
                "The maximum number of seconds that a session may remain
idle. A session will be dropped if it is idle for an
interval longer than this number of seconds. If set to
zero, then the server will never drop a session because
it is idle. Sessions that have a notification subscription
active are never dropped.";
            }

            list listen-endpoint {
              key "name";
              min-elements 1;
              description
                "The endpoints to listen for connections.";
              leaf name {
                type bbf-yang:string-ascii64;
                description
                  "An arbitrary name for the listen endpoint.";
              }

              leaf local-service-endpoint {
                type bbf-yang:string-ascii64;
                description
                  "The name that this network function will use when
reporting itself as an endpoint. For example, see section
5.8.2.1 Hello vOMCI service in TR-451 for how this
parameter is used for vOMCI communication. The value in
this leaf is typically the same value as the name of the
'listen-endpoint' but could be different for certain
deployments. If this leaf is not configured the name of
the 'listen-endpoint' is used.";
                reference
                  "TR-451 section 5.8.2.1";

              }

              choice transport {
                mandatory true;
                description
                  "Selects between available transports.";
                case grpc {
                  description
                    "Selection for gRPC server transport.";
                  container grpc-server {
                    if-feature bbf-grpcs:grpc-server;
                    description
                      "A wrapper around the gRPC server parameters to avoid name
collisions.";
                    choice tcp-client-options {
                      description
                        "Replicate some pre-standard IETF client/server options
in-file, and provide a place to add IETF client/server
stack options post-standard in the future.";
                      leaf remote-port {
                        type inet:port-number;
                        default "8443";
                        description
                          "The client will attempt to connect to the well-known
port value for 'grpc' (8443) if no value is
specified.";
                      }
                    }  // choice tcp-client-options
                  }  // container grpc-server
                }  // case grpc
              }  // choice transport

              container remote-clients {
                config false;
                description
                  "Remote clients that are currently connected to the
server.";
                list remote-client {
                  key "local-service-endpoint";
                  description
                    "A remote client that is currently connected.";
                  leaf local-service-endpoint {
                    type bbf-yang:string-ascii64;
                    description
                      "Identity of the local service endpoint of the remote
endpoint as provided as part of the vOMCI hello
exchange when the connection to the remote endpoint
was established.";
                  }
                }  // list remote-client

                notification remote-client-status-change {
                  description
                    "A notification traceable to a server listen endpoint
and a remote endpoint associated with the listen
endpoint. This notification is sent when remote
endpoint is connected or disconnected to/from the
listen endpoint.";
                  leaf remote-client {
                    type leafref {
                      path "../../../remote-clients/remote-client/local-service-endpoint";
                      require-instance
                        false;
                    }
                    mandatory true;
                    description
                      "The remote endpoint that was connected or
disconnected.";
                  }

                  leaf connected {
                    type boolean;
                    mandatory true;
                    description
                      "If 'true', the remote endpoint was connected.";
                  }

                  leaf remote-endpoint-state-last-change {
                    type yang:date-and-time;
                    mandatory true;
                    description
                      "The system date and time when the remote endpoint was
connected or disconnected.";
                  }
                }  // notification remote-client-status-change
              }  // container remote-clients
            }  // list listen-endpoint
          }  // container listen
        }  // container nf-server
      }  // container remote-nf

      container statistics {
        config false;
        description
          "Counters for the YANG messages sent between the ONU
Management Proxy and the vOMCI function or vOMCI Proxy
that are not targeted to an ONU.";
        action reset {
          description
            "Reset the statistics counters.";
        }  // rpc reset

        leaf in-messages {
          type yang:counter64;
          units "messages";
          config false;
          description
            "The number of messages that have been received by the
entity.";
        }

        leaf out-messages {
          type yang:counter64;
          units "messages";
          config false;
          description
            "The number of messages that have been transmitted by the
entity.";
        }

        leaf in-errored-messages {
          type yang:counter64;
          units "messages";
          config false;
          description
            "The number of messages received by the entity that contain
errors.";
        }
      }  // container statistics

      container managed-onus {
        description
          "The ONUs that are being managed by this entity.";
        action create-onu {
          description
            "Create an ONU within the ONU Management Proxy.";
          input {
            leaf name {
              type bbf-vomcit:onu-name;
              description
                "The unique name of the ONU.";
            }

            leaf xpon-onu-type {
              type identityref {
                base bbf-vomcit:xpon-onu-type;
              }
              description
                "The ONU's xPON type.";
            }

            leaf vendor-id {
              type bbf-vomcit:onu-vendor-id;
              description
                "The vendor name of the ONU.";
            }

            leaf software-version {
              type bbf-vomcit:onu-software-version;
              description
                "The software version associated with the ONU.";
            }
          }
        }  // rpc create-onu

        list managed-onu {
          key "name";
          config false;
          description
            "An ONU that is being managed by this entity.";
          leaf name {
            type bbf-vomcit:onu-name;
            description
              "The unique name of the ONU.";
          }

          leaf xpon-onu-type {
            type identityref {
              base bbf-vomcit:xpon-onu-type;
            }
            description
              "The ONU's xPON type.";
          }

          action delete-onu {
            description
              "Delete an ONU within the ONU Proxy. Note that this is not
the YANG state data but the Managed Entities state data
used to manage the ONU (e.g., MIB data sync valule).";
            input {
              leaf delete-state-data {
                type boolean;
                default "true";
                description
                  "When 'true', the ONU state data is deleted.";
              }
            }
          }  // rpc delete-onu

          action delete-only-onu-state-data {
            description
              "Delete remaining state data for ONUs that have already
been deleted from the list of managed ONUS.  Note - Do
not execute this unless the ONU has already been deleted
with 'delete-onu' and with the 'delete-state-data' leaf
set to 'true'. Note that this is not the YANG state data
but the Managed Entities state data used to manage the
ONU (e.g., MIB data sync valule).";
          }  // rpc delete-only-onu-state-data

          action set-onu-communication {
            description
              "Dynamically configure the information necessary to
establish if an ONU can be communicated with by the vOMCI
Proxy along with remote endpoint to use.";
            input {
              list onu-management-chain {
                key "nf-type nf-instance";
                ordered-by user;
                description
                  "The ordered list of ONU Management Proxy, vOMCI
function, vOMCI Proxy and OLT instances to use for
this ONU's management.";
                leaf nf-type {
                  type identityref {
                    base bbf-nft:nf-type;
                  }
                  description
                    "The type of NF.";
                }

                leaf nf-instance {
                  type bbf-yang:string-ascii64;
                  description
                    "The name of the NF.";
                }
              }  // list onu-management-chain

              leaf onu-communication-available {
                type boolean;
                description
                  "When true, the ONU is able to be communicated with
across the ONU management chain of entities.";
              }

              container onu-attachment-point {
                description
                  "The current ONU attachment point";
                leaf olt-name {
                  type bbf-vomcit:olt-name;
                  description
                    "The OLT name where the ONU is attached";
                }

                leaf channel-termination-name {
                  type string;
                  description
                    "The channel termination name where the ONU is attached.";
                }

                leaf onu-id {
                  type bbf-xpon-types:onu-id;
                  description
                    "This is the TC layer ONU-ID identifier assigned to the
ONU by the OLT during ONU activation.";
                  reference
                    "ITU-T G.984.3 clause 5.5.2
                    ITU-T G.987.3 clause 6.4.2
                    ITU-T G.9807.1 clause C.6.1.5.6
                    ITU-T G.989.3 clause 6.1.5.6";

                }
              }  // container onu-attachment-point

              leaf software-version {
                type bbf-vomcit:onu-software-version;
                description
                  "The software version associated with the ONU.";
              }

              leaf onu-management-chain-selection {
                type enumeration {
                  enum "vomci-policy" {
                    value 0;
                    description
                      "Identifies that the ONU management chain is
computed using a policy to select the vOMCI
function instance.";
                  }
                  enum "configured" {
                    value 1;
                    description
                      "Identifies that the ONU management chain is
configured by an external entity.";
                  }
                }
                description
                  "The option used to determine the ONU management
chain.";
              }

              leaf xpon-onu-type {
                type identityref {
                  base bbf-vomcit:xpon-onu-type;
                }
                description
                  "The ONU's xPON type.";
              }
            }
          }  // rpc set-onu-communication

          notification onu-management-chain-updated {
            description
              "The notification that reports that an ONU's management
chain has been modified by the entity.";
            list current-onu-management-chain {
              key "nf-type nf-instance";
              ordered-by user;
              description
                "The ordered list of ONU Management Proxy, vOMCI
function, vOMCI Proxy and OLT instances to use for
this ONU's management.";
              leaf nf-type {
                type identityref {
                  base bbf-nft:vnf-type;
                }
                description
                  "The type of NF.";
              }

              leaf nf-instance {
                type bbf-yang:string-ascii64;
                description
                  "The name of the NF.";
              }
            }  // list current-onu-management-chain
          }  // notification onu-management-chain-updated

          container onu-attachment-point {
            description
              "The current ONU attachment point";
            leaf olt-name {
              type bbf-vomcit:olt-name;
              description
                "The OLT name where the ONU is attached";
            }

            leaf channel-termination-name {
              type string;
              description
                "The channel termination name where the ONU is attached.";
            }

            leaf onu-id {
              type bbf-xpon-types:onu-id;
              description
                "This is the TC layer ONU-ID identifier assigned to the
ONU by the OLT during ONU activation.";
              reference
                "ITU-T G.984.3 clause 5.5.2
                ITU-T G.987.3 clause 6.4.2
                ITU-T G.9807.1 clause C.6.1.5.6
                ITU-T G.989.3 clause 6.1.5.6";

            }
          }  // container onu-attachment-point

          leaf vendor-id {
            type bbf-vomcit:onu-vendor-id;
            description
              "The vendor name of the ONU.";
          }

          leaf software-version {
            type bbf-vomcit:onu-software-version;
            description
              "The software version associated with the ONU.";
          }

          leaf voltmf-remote-endpoint {
            type bbf-yang:string-ascii64;
            description
              "The name remote endpoint to use for transmitting YANG
messages toward the vOLTMF.";
          }

          list onu-management-chain {
            key "nf-type nf-instance";
            config false;
            ordered-by user;
            description
              "The ordered list of ONU Management Proxy, vOMCI function,
vOMCI Proxy and OLT instances to use for this ONU's
management.";
            leaf nf-type {
              type identityref {
                base bbf-nft:vnf-type;
              }
              description "The type of NF.";
            }

            leaf nf-instance {
              type bbf-yang:string-ascii64;
              description
                "The name of the NF.";
            }
          }  // list onu-management-chain

          container statistics {
            config false;
            description
              "Statistics for per ONU interactions sent between the
entity and vOMCI function or ONU Management Proxy.";
            action reset {
              description
                "Reset the counters of the statistics.";
            }  // rpc reset

            leaf in-messages {
              type yang:counter64;
              units "messages";
              config false;
              description
                "The number of messages that have been received by the
entity.";
            }

            leaf out-messages {
              type yang:counter64;
              units "messages";
              config false;
              description
                "The number of messages that have been transmitted by the
entity.";
            }

            leaf in-errored-messages {
              type yang:counter64;
              units "messages";
              config false;
              description
                "The number of messages received by the entity that contain
errors.";
            }
          }  // container statistics
        }  // list managed-onu
      }  // container managed-onus
    }  // container onu-management-proxy
  }  // module bbf-onu-management-proxy