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:      Andre Brizido, Altice Labs

PS Leader:   Ken Kerpez, DZS

WA Director: Mengmeng Li, China Mobile

WA Director: Bruno Cornaglia, Vodafone

WA Director: Haomian Zheng, Huawei";

    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) 2019-2025, 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-451a1; see
the TR itself for full legal notices.";

    revision "2025-02-03" {
      description
        "Amendment 1.
* Approval Date:    2025-02-03.
* Publication Date: 2025-02-03.";
      reference
        "TR-451a1: vOMCI Specification
        	<https://www.broadband-forum.org/technical/download/
        		 TR-451_Amendment-1.pdf>";

    }

    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.";
        }

        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, if 'type' is set
to 'other-topology'.";
        }

        list vnf {
          key "name";
          description
            "A 'flavor' of VNF (not instance) intended to be used within
the network. For example, 'flavor' can be based on vendor or
version info.";
          leaf name {
            type bbf-yang:string-ascii64;
            description
              "The name of the 'flavor' of VNF.";
          }

          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 VNF instance.";
          }

          leaf vnf {
            type leafref {
              path "../../vnf/name";
            }
            mandatory true;
            description
              "The name of the 'flavor' of VNF intended to be used within
the network.";
          }

          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
            "An intended link between network functions within the
network. Depending on usage, endpoints of a link may be at a
physical and/or a virtual NF.";
          leaf name {
            type bbf-yang:string-ascii64;
            description
              "The name of the link.";
          }

          list endpoint {
            key "nf-instance endpoint";
            max-elements 2;
            description
              "A service endpoint at an instance of a network function
forming one end of a link between network functions.";
            leaf nf-instance {
              type bbf-yang:string-ascii64;
              description
                "The name of the instance of the network function.

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 service endpoint at the instance of the
network function.";
            }

            leaf nf-type {
              type bbf-yang:string-ascii64;
              description
                "The type of network function.";
            }
          }  // 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'" {
                description
                  "Only applies to ONUs.";
              }
              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')" {
                description
                  "Only applies to ONU vendor or 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 connections the client is to initiate.

If multiple remote servers are configured, they are handled
independently.";
            list remote-server {
              key "name";
              description
                "A remote server the client is to 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 network function associated with the remote
endpoint (e.g, vOMCI-proxy, vOMCI-function, vOLTMF, OLT).

This may be used to verify whether the endpoint when
connected is of the appropriate type.";
              }

              leaf on-demand {
                type boolean;
                default "false";
                description
                  "Determines whether the client is to establish a
connection to the endpoint only on-demand ('true'),
i.e., only when and if the connection is needed, or
whether the client is to establish a persistent
connection ('false').";
              }

              leaf local-service-endpoint {
                type bbf-yang:string-ascii64;
                description
                  "The service endpoint name the NF is to use to identify
this endpoint when establishing a session to the remote
endpoint.";
              }

              choice transport {
                mandatory true;
                description
                  "Selects between available client transports.";
                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 Kafka agent is to use as a Kafka
client to identify itself as a consumer or producer of
messages (events).";
                    }

                    container publication-parameters {
                      if-feature bbf-kafkaa:message-publication;
                      description
                        "The Kafka agent publication properties.";
                      list topic {
                        key "name";
                        description
                          "A topic the Kafka agent is to 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
                            "The partition of the topic to be used for publication and
consumption of messages.

The name of the partition is required if the Kafka topic is
divided into several partitions, meaning that the topic is
spread over a number of 'buckets' located on different Kafka
brokers.";
                        }
                      }  // 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 consumer Group Id that is to associate this consumer
with a consumer group, whereby each consumer within the
group will ideally read from one partition of the topic.";
                      }

                      list topic {
                        key "name";
                        description
                          "A topic the Kafka agent is to 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
                            "The partition of the topic to be used for publication and
consumption of messages.

The name of the partition is required if the Kafka topic is
divided into several partitions, meaning that the topic is
spread over a number of 'buckets' located on different Kafka
brokers.";
                        }
                      }  // list topic
                    }  // container consumption-parameters

                    list access-point {
                      key "name";
                      min-elements 1;
                      ordered-by user;
                      description
                        "An access point to a Kafka broker that a Kafka agent
operating as a Kafka client may attempt to connect to in
the order defined by the user.

Defining more than one access point enables high-
availability.";
                      leaf name {
                        type bbf-yang:string-ascii64;
                        description
                          "An arbitrary name for the access point.";
                      }

                      container kafka-agent-transport-parameters {
                        description
                          "Parameters to establish a transport layer from the Kafka
agent (Kafka client) to the Kafka broker.";
                        choice tcp-client-options {
                          description
                            "Selects between possible TCP transport layer
configuration options.";
                          container remote-port {
                            description
                              "The port of the remote host over which a TCP
session is to be established to the Kafka broker.";
                            leaf remote-port {
                              type inet:port-number;
                              default "9092";
                              description
                                "The destination port on the remote host to which
the Kafka agent as Kafka client is to attempt to
establish a TCP session with the Kafka broker.";
                            }
                          }  // 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

              container statistics {
                config false;
                description
                  "Statistics associated with the remote server.";
                action reset {
                  description
                    "Reset 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 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 gRPC channel may have
no outstanding RPCs, after which the server will close the
connection.

If set to zero, then the server is not to close the
connection, if it is idle.

Note that connections for which sessions have a
notification subscription active are never closed.";
            }

            list listen-endpoint {
              key "name";
              min-elements 1;
              description
                "An endpoint 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 service endpoint name the NF is to use to identify
this listen endpoint when a remote endpoint attempts to
establish a session to it.";
              }

              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
                        "Selects between possible TCP transport layer configuration
options.";
                      leaf remote-port {
                        type inet:port-number;
                        default "8443";
                        description
                          "The destination port used by the remote gRPC client to
connect to this gRPC server to establish a TCP session
and then start an HTTP/2 connection to establish a
gRPC channel.

The local gRPC server listens for incoming TCP
connections on this port.";
                      }
                    }  // 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-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.

If 'false', the remote endpoint was disconnected.";
                  }

                  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

              container statistics {
                config false;
                description
                  "Statistics associated with the local server endpoint.";
                action reset {
                  description
                    "Reset 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 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