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Versions: 00 01 02 03 04 draft-ietf-dhc-dhcpv6-yang

DHC Working Group                                                 Y. Cui
Internet-Draft                                                   H. Wang
Intended status: Standards Track                                  L. Sun
Expires: January 4, 2016                             Tsinghua University
                                                                T. Lemon
                                                                 Nominum
                                                               I. Farrer
                                                     Deutsche Telekom AG
                                                            July 3, 2015


                YANG Data Model for DHCPv6 Configuration
                      draft-cui-dhc-dhcpv6-yang-03

Abstract

   There has no unified method to configure DHCPv6 server ,relay and
   client itself, always pre-configured manually by operators.

   IETF netmod WG has developed a general data model for NETCONF
   protocol, YANG data model [RFC6020].

   This document defines a YANG data model for the configuration and
   management of DHCPv6 server, DHCPv6 relay and DHCPv6 client.  With
   this model, the operators can configure and manage the devices by
   using NETCONF.

Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in [RFC2119].

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at http://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."




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   This Internet-Draft will expire on January 4, 2016.

Copyright Notice

   Copyright (c) 2015 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Objectives  . . . . . . . . . . . . . . . . . . . . . . . . .   3
     2.1.  DHCPv6 server . . . . . . . . . . . . . . . . . . . . . .   4
     2.2.  DHCPv6 relay  . . . . . . . . . . . . . . . . . . . . . .   4
     2.3.  DHCPv6 client . . . . . . . . . . . . . . . . . . . . . .   4
   3.  DHCPv6 Tree Diagrams  . . . . . . . . . . . . . . . . . . . .   4
     3.1.  DHCPv6 Server Tree Diagrams . . . . . . . . . . . . . . .   4
     3.2.  DHCPv6 Relay Tree Diagrams  . . . . . . . . . . . . . . .  12
     3.3.  DHCPv6 Client Tree Diagrams . . . . . . . . . . . . . . .  15
     3.4.  Notifications Mechanism for DHCPv6  . . . . . . . . . . .  20
   4.  DHCPv6 YANG Model . . . . . . . . . . . . . . . . . . . . . .  22
   5.  Security Considerations (TBD) . . . . . . . . . . . . . . . .  63
   6.  IANA Considerations (TBD) . . . . . . . . . . . . . . . . . .  63
   7.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  63
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  63
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .  63
     8.2.  Informative References  . . . . . . . . . . . . . . . . .  64
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  65

1.  Introduction

   This document defines a YANG data model for the configuration and
   management of DHCPv6 server, DHCPv6 relay and DHCPv6 client.  With
   this model, the operators can configure and manage the devices by
   using NETCONF.

   Model include three sub-modules:




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   o  DHCPv6 server

   o  DHCPv6 relay

   o  DHCPv6 client

   For DHCPv6 client configuration, it is worth noting that as DHCPv6
   itself a device configuration protocol, the intention of this
   document is not to replace client configuration of DHCPv6 options and
   parameters over the DHCPv6 protocol with the configuration of DHCPv6
   options and parameters over NETCONF/YANG.  The DHCPv6 client model is
   intended for the configuration of the DHCPv6 client function and also
   for obtaining read-only state data from the client which has been
   learnt via the normal DHCPv6 message flow.  This gives an operator a
   better method for managing DHCPv6 clients and simplifies
   troubleshooting.

1.1.  Terminology

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in [RFC2119].

   The reader should be familiar with the terms defined in DHCPv6
   [RFC3315] and relevant documents.

   DHCPv6 tree diagrams provide a concise representation of a YANG
   module to help readers understand the module structure.  The meaning
   if the symbols in these diagrams is as follows:

   o  Brackets "[" and "]" enclose list keys.

   o  Braces "{" and "}" enclose feature content.

   o  Parentheses "(" and ")" enclose choice and case nodes, and case
      nodes are also marked with a colon (":").

   o  Symbols after data node names: "?" means an optional node, and "*"
      denotes a list and leaf-list.

   o  Abbreviations before data node names: "rw" means configuration
      data (read-write), and "ro" means state data (read-only).

2.  Objectives

   This document defines a YANG data model that can be used to configure
   and manage DHCPv6 server, DHCPv6 relay and DHCPv6 client.




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2.1.  DHCPv6 server

   DHCPv6 server parameters.

2.2.  DHCPv6 relay

   DHCPv6 relay parameters.

2.3.  DHCPv6 client

   DHCPv6 client parameters.

3.  DHCPv6 Tree Diagrams

3.1.  DHCPv6 Server Tree Diagrams

     +--rw dhcpv6
        +--rw server                                {dhcpv6-server}?
           +--rw serv-attributes
           |  +--rw name                            string
           |  +--rw duid
           |  |  +--rw duid-type                    uint16
           |  |  +--rw duid-high-1                  uint32
           |  |  +--rw duid-high-2                  uint32
           |  |  +--rw duid-low-1                   uint32
           |  |  +--rw duid-low-2                   uint32
           |  +--rw enable                          boolean
           |  +--rw ipv6-address                    inet:ipv6-address
           |  +--rw description?                    string
           |  +--rw pd-function                     boolean
           |  +--rw stateless-service               boolean
           |  +--rw rapid-commit                    boolean
           |  +--rw store-client-link-layer?        boolean
           |  +--rw vendor-info
           |     +--rw ent-num                      uint32
           |     +--rw data*                        string
           +--rw option-sets
           |  +--rw option-set* [option-set-id]
           |     +--rw option-set-id                uint8
           |     +--rw user-class-value?            string
           |     +--rw enterprise-number?           uint32
           |     +--rw store-client-link-layer?     boolean
           |     +--rw preference-option
           |     |  +--rw enable                    boolean
           |     |  +--rw preference-value          uint8
           |     +--rw sip-server-option
           |     |  +--rw enable                    boolean
           |     |  +--rw sip-server* [sip-serv-id]



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           |     |     +--rw sip-serv-id            uint8
           |     |     +--rw sip-serv-domain-name   string
           |     |     +--rw sip-serv-addr          inet:ipv6-address
           |     +--rw dns-config-option
           |     |  +--rw enable                    boolean
           |     |  +--rw dns-server* [dns-serv-id]
           |     |  |  +--rw dns-serv-id            uint8
           |     |  |  +--rw dns-serv-addr          inet:ipv6-address
           |     |  +--rw domain-search-list        string
           |     +--rw nis-config-option
           |     |  +--rw enable                    boolean
           |     |  +--rw nis-server* [nis-serv-id]
           |     |     +--rw nis-serv-id            uint8
           |     |     +--rw nis-serv-addr          inet:ipv6-address
           |     +--rw nis-plus-config-option
           |     |  +--rw enable                    boolean
           |     |  +--rw nis-plus-server* [nis-plus-serv-id]
           |     |     +--rw nis-plus-serv-id       uint8
           |     |     +--rw nis-plus-serv-addr     inet:ipv6-address
           |     +--rw info-refresh-time-option
           |     |  +--rw enable                    boolean
           |     |  +--rw info-refresh-time         yang:timeticks
           |     +--rw cli-fqdn-option
           |     |  +--rw enable                    boolean
           |     |  +--rw server-initiate-update    boolean
           |     |  +--rw client-initiate-update    boolean
           |     |  +--rw modify-name-from-cli      boolean
           |     +--rw timezone-option
           |     |  +--rw enable                    boolean
           |     |  +--rw tz-posix                  string
           |     |  +--rw tz-database               string
           |     +--rw ntp-server-option
           |     |  +--rw enable                    boolean
           |     |  +--rw ntp-server* [ntp-serv-id]
           |     |     +--rw ntp-serv-id            uint8
           |     |     +--rw ntp-serv-addr          inet:ipv6-address
           |     |     +--rw ntp-serv-mul-addr      inet:ipv6-address
           |     |     +--rw ntp-serv-fqdn          string
           |     +--rw sntp-server-option
           |     |  +--rw enable                    boolean
           |     |  +--rw sntp-server* [sntp-serv-id]
           |     |     +--rw sntp-serv-id           uint8
           |     |     +--rw sntp-serv-addr         inet:ipv6-address
           |     +--rw network-boot-option
           |     |  +--rw enable                    boolean
           |     |  +--rw boot-file* [boot-file-id]
           |     |     +--rw boot-file-id           uint8
           |     |     +--rw suitable-arch-type*    uint16



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           |     |     +--rw suitable-net-if*       uint32
           |     |     +--rw boot-file-url          string
           |     |     +--rw boot-file-paras* [para-id]
           |     |        +--rw para-id             uint8
           |     |        +--rw parameter           string
           |     +--rw dslite-option
           |     |  +--rw enable                    boolean
           |     |  +--rw dslite-aftr-name          string
           |     +--rw kerberos-option
           |     |  +--rw enable                    boolean
           |     |  +--rw default-realm-name        string
           |     |  +--rw kdc-info* [kdc-id]
           |     |     +--rw kdc-id                 uint8
           |     |     +--rw priority               uint16
           |     |     +--rw weight                 uint16
           |     |     +--rw transport-type         uint8
           |     |     +--rw port-number            uint16
           |     |     +--rw kdc-ipv6-addr          inet:ipv6-address
           |     |     +--rw realm-name             string
           |     +--rw addr-selection-option
           |     |  +--rw enable                    boolean
           |     |  +--rw a-bit-set                 boolean
           |     |  +--rw p-bit-set                 boolean
           |     |  +--rw policy-table* [policy-id]
           |     |     +--rw policy-id              uint8
           |     |     +--rw label                  uint8
           |     |     +--rw precedence             uint8
           |     |     +--rw prefix-len             uint8
           |     |     +--rw prefix                 inet:ipv6-prefix
           |     +--rw sol-max-rt-option
           |     |  +--rw enable                    boolean
           |     |  +--rw sol-max-rt-value          yang:timeticks
           |     +--rw inf-max-rt-option
           |     |  +--rw enable                    boolean
           |     |  +--rw inf-max-rt-value          yang:timeticks
           |     +--rw pcp-server-option
           |     |  +--rw enable                    boolean
           |     |  +--rw pcp-server* [pcp-serv-id]
           |     |     +--rw pcp-serv-id            uint8
           |     |     +--rw pcp-serv-addr*         inet:ipv6-address
           |     +--rw s46-rule-option
           |     |  +--rw enable                    boolean
           |     |  +--rw s46-rule* [rule-id]
           |     |     +--rw rule-id                uint8
           |     |     +--rw rule-type              enumeration
           |     |     +--rw ea-len                 uint8
           |     |     +--rw prefix4-len            uint8
           |     |     +--rw ipv4-prefix            inet:ipv4-prefix



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           |     |     +--rw prefix6-len            uint8
           |     |     +--rw ipv6-prefix            inet:ipv6-prefix
           |     |     +--rw port-parameter
           |     |        +--rw offset              uint8
           |     |        +--rw psid-len            uint8
           |     |        +--rw psid                uint16
           |     +--rw s46-br-option
           |     |  +--rw enable                    boolean
           |     |  +--rw br* [br-id]
           |     |      +--rw br-id                 uint8
           |     |      +--rw br-ipv6-addr          inet:ipv6-address
           |     +--rw s46-dmr-option
           |     |  +--rw enable                    boolean
           |     |  +--rw dmr* [dmr-id]
           |     |     +--rw dmr-id                 uint8
           |     |     +--rw dmr-prefix6-len        uint8
           |     |     +--rw dmr-ipv6-prefix        inet:ipv6-prefix
           |     +--rw s46-v4-v6-binding-option
           |        +--rw enable                    boolean
           |        +--rw ce* [ce-id]
           |           +--rw ce-id                  uint8
           |           +--rw ipv4-addr              inet:ipv4-address
           |           +--rw bind-prefix6-len       uint8
           |           +--rw bind-ipv6-prefix       inet:ipv6-prefix
           |           +--rw port-parameter
           |              +--rw offset              uint8
           |              +--rw psid-len            uint8
           |              +--rw psid                uint16
           +--rw network-ranges
           |  +--rw option-set [option-set-id]
           |  +--rw network-range* [network-range-id]
           |     +--rw network-range-id             uint8
           |     +--rw network-description          string
           |     +--rw network-prefix               inet:ipv6-prefix
           |     +--rw inherit-option-set           boolean
           |     +--rw option-set [option-set-id]
           |     +--rw address-pools
           |     |  +--rw address-pool* [pool-id]
           |     |  |  +--rw pool-id                uint8
           |     |  |  +--rw pool-prefix            inet:ipv6-prefix
           |     |  |  +--rw start-address          inet:ipv6-address
           |     |  |  +--rw end-address            inet:ipv6-address
           |     |  |  +--rw preferred-lifetime     yang:timeticks
           |     |  |  +--rw valid-lifetime         yang:timeticks
           |     |  |  +--ro total-ipv6-count       uint64
           |     |  |  +--ro used-ipv6-count        uint64
           |     |  |  +--rw utilization-ratio      threshold
           |     |  |  +--rw inherit-option-set     boolean



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           |     |  |  +--rw option-set [option-set-id]
           |     |  |  +--rw reserved-addresses
           |     |  |     +--rw static-binding* [cli-id]
           |     |  |     |  +--rw cli-id           uint32
           |     |  |     |  +--rw duid
           |     |  |     |  |  +--rw duid-type     uint16
           |     |  |     |  |  +--rw duid-high-1   uint32
           |     |  |     |  |  +--rw duid-high-2   uint32
           |     |  |     |  |  +--rw duid-low-1    uint32
           |     |  |     |  |  +--rw duid-low-2    uint32
           |     |  |     |  +--rw reserv-addr*     inet:ipv6-address
           |     |  |     +--rw other-reserv-addr*  inet:ipv6-address
           |     |  +--ro binding-info* [cli-id]
           |     |     +--ro cli-id                 uint32
           |     |     +--ro duid
           |     |     |  +--ro duid-type           uint16
           |     |     |  +--ro duid-high-1         uint32
           |     |     |  +--ro duid-high-2         uint32
           |     |     |  +--ro duid-low-1          uint32
           |     |     |  +--ro duid-low-2          uint32
           |     |     +--ro cli-ia* [iaid]
           |     |        +--ro ia-type             string
           |     |        +--ro iaid                string
           |     |        +--ro cli-addr*           inet:ipv6-address
           |     |        +--ro pool-id?            uint8
           |     +--rw prefix-pools
           |     |  +--rw prefix-pool* [pool-id]
           |     |  |  +--rw pool-id                uint8
           |     |  |  +--rw prefix                 inet:ipv6-prefix
           |     |  |  +--rw prefix-length          uint8
           |     |  |  +--rw preferred-lifetime     yang:timeticks
           |     |  |  +--rw valid-lifetime         yang:timeticks
           |     |  |  +--rw utilization-ratio      threshold
           |     |  |  +--rw inherit-option-set     boolean
           |     |  |  +--rw option-set [option-set-id]
           |     |  |  +--rw reserved-prefixes
           |     |  |     +--rw static-binding* [cli-id]
           |     |  |     |  +--rw cli-id           uint32
           |     |  |     |  +--rw duid
           |     |  |     |  |  +--rw duid-type     uint16
           |     |  |     |  |  +--rw duid-high-1   uint32
           |     |  |     |  |  +--rw duid-high-2   uint32
           |     |  |     |  |  +--rw duid-low-1    uint32
           |     |  |     |  |  +--rw duid-low-2    uint32
           |     |  |     |  +--rw reserv-prefix-len  uint8
           |     |  |     |  +--rw reserv-prefix    inet:ipv6-prefix
           |     |  |     +--rw exclude-prefix-len  uint8
           |     |  |     +--rw exclude-prefix      inet:ipv6-prefix



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           |     |  |     +--rw other-reserv-prefix*  [reserv-id]
           |     |  |        +--rw reserv-id        uint8
           |     |  |        +--rw prefix-len       uint8
           |     |  |        +--rw prefix           inet:ipv6-prefix
           |     |  +--ro binding-info* [cli-id]
           |     |     +--ro cli-id                 uint32
           |     |     +--ro duid
           |     |     |  +--ro duid-type           uint16
           |     |     |  +--ro duid-high-1         uint32
           |     |     |  +--ro duid-high-2         uint32
           |     |     |  +--ro duid-low-1          uint32
           |     |     |  +--ro duid-low-2          uint32
           |     |     +--ro cli-iapd* [iaid]
           |     |        +--ro iaid                uint32
           |     |        +--ro cli-prefix*         uint32
           |     |        +--ro cli-prefix-len*     uint8
           |     |        +--ro pool-id?            uint8
           |     +--rw hosts
           |        +--rw host* [cli-id]
           |           +--rw cli-id                 uint32
           |           +--rw duid
           |           |  +--rw duid-type           uint16
           |           |  +--rw duid-high-1         uint32
           |           |  +--rw duid-high-2         uint32
           |           |  +--rw duid-low-1          uint32
           |           |  +--rw duid-low-2          uint32
           |           +--rw inherit-option-set     boolean
           |           +--rw option-set [option-set-id]
           |           +--rw nis-domain-name?       string
           |           +--rw nis-plus-domain-name?  string
           +--rw relay-opaque-paras
           |  +--rw relays* [relay-name]
           |     +--rw relay-name                   string
           |     +--rw interface-info* [if-name]
           |     |  +--rw if-name                   string
           |     |  +--rw interface-id              string
           |     +--rw subscribers* [subscriber]
           |     |  +--rw subscriber                uint8
           |     |  +--rw subscriber-id             string
           |     +--rw remote-host* [ent-num]
           |        +--rw ent-num                   uint32
           |        +--rw remote-id                 string
           +--rw rsoo-enabled-options
           |  +--rw rsoo-enable-option* [option-code]
           |     +--rw option-code                  uint16
           |     +--rw description                  string
           +--ro packet-stats
              +--ro solicit-count                   uint32



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              +--ro request-count                   uint32
              +--ro renew-count                     uint32
              +--ro rebind-count                    uint32
              +--ro decline-count                   uint32
              +--ro release-count                   uint32
              +--ro info-req-count                  uint32
              +--ro advertise-count                 uint32
              +--ro confirm-count                   uint32
              +--ro reply-count                     uint32
              +--ro reconfigure-count               uint32
              +--ro relay-forward-count             uint32
              +--ro relay-reply-count               uint32

                   Figure 1: DHCPv6 Data Model Structure

   Introduction of important nodes:

   o  serv-attributes: This container contains basic attributes of a
      DHCPv6 server such as DUID, server name and so on.  Some optional
      functions that can be provided by the server is also included.

   o  duid: Each server and client has only one DUID (DHCP Unique
      Identifier).  The DUID here identifies a unique DHCPv6 server for
      clients.  DUID consists of a two-octet type field and an arbitrary
      length (no more than 128 bits) content field.  This duid container
      includes a "duid-type" leaf to specify the type and following four
      leaf nodes to define the variable length content.

   o  pd-function: Whether the server can act as a delegating router to
      perform prefix delegation ([RFC3633]).

   o  stateless-service: A boolean value specifies whether the server
      support client-server exchanges involving two messages defined in
      ([RFC3315]).

   o  rapid-commit: Setting the value to '1' represents the server
      support the Solicit-Reply message exchange. '0' means the server
      will simply ignore the Rapid Commit option in Solicit message.

   o  option-sets: DHCPv6 employs various options to carry additional
      information and parameters in DHCP messages.  This container
      defines all the possible options that need to be configured at the
      server side.  The relevant RFCs that define those options include:
      [RFC3315], [RFC3319], [RFC3646], [RFC3898], [RFC4242], [RFC4704],
      [RFC4833], [RFC5908], [RFC5970], [RFC4075], [RFC6334], [RFC6784],
      [RFC7078], [RFC7083], [RFC7291], [I-D.ietf-softwire-map-dhcp].





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   o  option-set: A server may allow different option sets to be
      configured for different conditions (i.e. different networks,
      clients and etc).  This "option-set" list enables various sets of
      options being defined and configured in a single server.
      Different sets are distinguished by the key called "option-set-
      id".  All the possible options discussed above are defined in the
      list and each option is corresponding to a container.  Since all
      the options in the list are optional, each container in this list
      has a boolean parameter called "enable" to indicate whether this
      option (container) will be included in the current option set or
      not.

   o  network-ranges: This model supports a hierarchy to achieve dynamic
      configuration.  That is to say we could configure the server at
      different levels through this model.  The top level is a global
      level which is defined as the container "network-ranges".  The
      following levels are defined as sub-containers under it.  The
      "network-ranges" contains the parameters (e.g. option-sets) that
      would be allocated to all the clients served by this server.

   o  network-range: Under the "network-ranges" container, a "network-
      range" list is defined to configure the server at a network level
      which is also considered as the second level.  Different network
      are identified by the key "network-range-id".  This is because a
      server may have different configuration parameters (e.g. option
      sets) for different networks.

   o  address-pools: Under the "network-range" list, a container
      describes the DHCPv6 server's address pools for a specific network
      is defined.  This container supports the server to be configured
      at a pool level.

   o  address-pool: A DHCPv6 server can be configured with several
      address pools for a specific network.  This list defines such
      address pools which are distinguish by the key called "pool-id".

   o  binding-info: A list records a binding information for each DHCPv6
      client that has already been allocated IPv6 addresses.

   o  prefix-pools: If a server supports prefix delegation function,
      this container under the "network-range" list will be valid to
      define the delegating router's prefix pools for a specific
      network.  This container also supports the server to be configured
      at a pool level.

   o  prefix-pool: Similar to server's address pools, a delegating
      router can also be configured with multiple prefix pools specified
      by a list called "prefix-pool".



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   o  binding-info: A list records a binding information for each DHCPv6
      requesting router that has already been configured IPv6 prefixes.

   o  hosts: A server may also desire to be configured at a host level
      under some circumstances.  This container include a list called
      "host" to allow the server carrying different parameters (e.g.
      option sets) for different hosts.

   o  relay-opaque-paras: This container contains some opaque values in
      Relay Agent options that need to be configured on the server side
      only for value match.  Such Relay Agent options include Interface-
      Id option, Remote-Id option and Subscriber-Id option.

   o  rsoo-enabled-options: [RFC6422] requires that the server SHOULD
      have an administrator-configurable list of RSOO-enabled options.
      This container include a list called "rsoo-enable-option" to allow
      new RSOO-enabled options to be defined at the server side.

   o  packet-stats: A container presents the packet statistics related
      to the DHCPv6 server.

3.2.  DHCPv6 Relay Tree Diagrams

   +--rw dhcpv6
      +-- ...
      |
      +--rw relay                                 {dhcpv6-relay}?
         +--rw relay-attributes
         |  +--rw name                            string
         |  +--rw enable                          boolean
         |  +--rw ipv6-address                    inet:ipv6-address
         |  +--rw description?                    string
         |  +--rw dest-addrs*                     inet:ipv6-address
         |  +--rw subscribers* [subscriber]
         |  |  +--rw subscriber                   uint8
         |  |  +--rw subscriber-id                string
         |  +--rw remote-host* [entNum]
         |  |  +--rw ent-num                      uint32
         |  |  +--rw remote-id                    string
         |  +--rw vendor-info
         |     +--rw ent-num                      uint32
         |     +--rw data*                        string
         +--rw relay-supplied-options-option
         |  +--rw rsoo-set* [rsoo-set-id]
         |     +--rw rsoo-set-id               uint8
         |     +--rw erp-local-domain-name-option
         |        +--rw enable                 boolean
         |        +--rw erp-for-client* [cli-id]



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         |           +--rw cli-id              uint32
         |           +--rw duid
         |           |  +--rw duid-type        uint16
         |           |  +--rw duid-high-1      uint32
         |           |  +--rw duid-high-2      uint32
         |           |  +--rw duid-low-1       uint32
         |           |  +--rw duid-low-2       uint32
         |           +--rw erp-name            string
         +--rw relay-interfaces
         |  +--rw relay-if* [if-name]
         |     +--rw if-name                   string
         |     +--rw enable                    boolean
         |     +--rw interface-id?             string
         |     +--rw rsoo-set [rsoo-set-id]
         |     +--rw pd-route* [pd-route-id]
         |     |  +--rw pd-route-id            uint8
         |     |  +--rw requesting-router-id   uint32
         |     |  +--rw delegating-router-id   uint32
         |     |  +--rw next-router            inet:ipv6-address
         |     |  +--rw last-router            inet:ipv6-address
         |     +--rw next-entity* [dest-addr]
         |        +--rw dest-addr              inet:ipv6-address
         |        +--rw available              boolean
         |        +--rw multicast              boolean
         |        +--rw server                 boolean
         |        +--ro packet-stats
         |           +--ro cli-packet-rvd-count  uint32
         |           +--ro solicit-rvd-count     uint32
         |           +--ro request-rvd-count     uint32
         |           +--ro renew-rvd-count       uint32
         |           +--ro rebind-rvd-count      uint32
         |           +--ro decline-rvd-count     uint32
         |           +--ro release-rvd-count     uint32
         |           +--ro info-req-rvd-count    uint32
         |           +--ro relay-for-rvd-count   uint32
         |           +--ro relay-rep-rvd-count   uint32
         |           +--ro packet-to-cli-count   uint32
         |           +--ro adver-sent-count      uint32
         |           +--ro confirm-sent-count    uint32
         |           +--ro reply-sent-count      uint32
         |           +--ro reconfig-sent-count   uint32
         |           +--ro relay-for-sent-count  uint32
         |           +--ro relay-rep-sent-count  uint32
         +--ro relay-stats
            +--ro cli-packet-rvd-count            uint32
            +--ro relay-for-rvd-count             uint32
            +--ro relay-rep-rvd-count             uint32
            +--ro packet-to-cli-count             uint32



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            +--ro relay-for-sent-count            uint32
            +--ro relay-rep-sent-count            uint32
            +--ro discarded-packet-count          uint32

   Introduction of important nodes:

   o  relay-attributes: A container describes some basic attributes of
      the relay agent including some relay agent specific options data
      that need to be configured previously.  Such options include
      Remote-Id option and Subscriber-Id option.

   o  dest-addrs: Each DHCPv6 relay agent may be configured with a list
      of destination addresses.  This node defines such a list of IPv6
      addresses that may include unicast addresses, multicast addresses
      or other addresses.

   o  relay-supplied-options-option: DHCPv6 relay agent could provide
      some information that would be useful to DHCPv6 client.  Since
      relay agent cannot provide options directly to the client,
      [RFC6422] defines RSOO-enabled options to propose options for the
      server to send to the client.  This container modelled such RSOO-
      enabled options.

   o  rsoo-set: This list under the "relay-supplied-options-option"
      container is similar to the "option-set" defined in server
      feature.  It allows the relay to implement several sets of RSOO-
      enabled options for different interfaces.  The list only include
      the EAP Re-authentication Protocol (ERP) Local Domain Name DHCPv6
      Option defined in [RFC6440], since it is the only one RSOO-enabled
      options accepted by IANA so far.

   o  relay-interfaces: The "realy-interfaces" defines common
      configuration and state parameters of the interfaces belonging to
      a DHCPv6 relay agent.

   o  relay-if: A list under "relay-interfaces" container that describes
      a specific interface and its corresponding parameters.  Here we
      use a string called "ifName" as the key of list.

   o  pd-route: A sub-container of "relay-if" which describes the route
      for delegated prefixes into the provider edge router.

   o  next-entity: This node defines a list that is used to describe the
      next hop entity of this relay agent.  Different entities are
      distinguished by their addresses.

   o  packet-stats: A container shows packet state information of a
      specific data communication.



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   o  relay-stats: The "relayStats" container records and presents the
      overall packet statistics of the relay agent.

3.3.  DHCPv6 Client Tree Diagrams

   +--rw dhcpv6
      +-- ...
      |
      +--rw client                                {dhcpv6-client}?
         +--rw client-interfaces
            +--rw client-if* [if-name]
               +--rw if-name                      string
               +--rw cli-id                       uint32
               +--rw duid
               |  +--rw duid-type                 uint16
               |  +--rw duid-high-1               uint32
               |  +--rw duid-high-2               uint32
               |  +--rw duid-low-1                uint32
               |  +--rw duid-low-2                uint32
               +--rw enable                       boolean
               +--rw description?                 string
               +--rw pd-function                  boolean
               +--rw rapid-commit                 boolean
               +--rw mo-tab
               |  +--rw m-tab                     boolean
               |  +--rw o-tab                     boolean
               +--rw oro-options
               |  +--rw oro-option* [option-code]
               |     +--rw option-code            uint16
               |     +--rw description            string
               +--rw client-cofigured-options
               |  +--rw user-class-option
               |  |  +--rw enable                 boolean
               |  |  +--rw user-class* [user-class-id]
               |  |     +--rw user-class-id       uint8
               |  |     +--rw user-class-info     string
               |  +--rw vendor-class-option
               |  |  +--rw enable                 boolean
               |  |  +--rw ent-num                uint32
               |  |  +--rw data*                  string
               |  +--rw client-fqdn-option
               |  |  +--rw enable                 boolean
               |  |  +--rw fqdn                   string
               |  |  +--rw server-initiate-update boolean
               |  |  +--rw client-initiate-update boolean
               |  +--rw client-architecture-type-option
               |  |  +--rw enable                 boolean
               |  |  +--rw architecture-types* [type-id]



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               |  |  |  +--rw type-id             uint16
               |  |  |  +--rw most-preferred      boolean
               |  +--rw client-network-interface-option
               |  |  +--rw enable                 booelan
               |  |  +--rw type                   uint8
               |  |  +--rw major                  uint8
               |  |  +--rw minor                  uint8
               |  +--rw kerberos-principal-name-option
               |  |  +--rw enable                 boolean
               |  |  +--rw principal-name         string
               |  +--rw client-link-layer-addr-option
               |     +--rw enable                 boolean
               |     +--rw link-layer-type        uint16
               |     +--rw link-layer-addr        string
               +--ro identity-associations
               |  +--ro identity-association* [iaid]
               |     +--ro iaid                   uint32
               |     +--ro ia-type                string
               |     +--ro ipv6-addr*             inet:ipv6-address
               |     +--ro ipv6-prefix*           inet:ipv6-prefix
               |     +--ro prefix-length*         uint8
               |     +--ro t1-time                yang:date-and-time
               |     +--ro t2-time                yang:date-and-time
               |     +--ro preferred-lifetime     yang:timeticks
               |     +--ro valid-lifetime         yang:timeticks
               +--ro if-other-paras
               |  +--ro uni-dhcpv6-serv-addr      inet:ipv6-address
               |  +--ro dns-paras
               |  |  +--ro domain-search-list     string
               |  |  +--ro dns-servers* [dns-serv-id]
               |  |     +--ro dns-serv-id         uint8
               |  |     +--ro dns-serv-addr       inet:ipv6-address
               |  +--ro sip-paras
               |  |  +--ro sip-servers* [sip-serv-id]
               |  |     +--ro sip-serv-id         uint8
               |  |     +--ro sip-serv-addr       inet:ipv6-address
               |  |     +--ro sip-serv-domain-name  string
               |  +--ro nis-paras
               |  |  +--ro nis-domain-name        string
               |  |  +--ro nis-server* [nis-serv-id]
               |  |     +--ro nis-serv-id         uint8
               |  |     +--ro nis-serv-addr       inet:ipv6-address
               |  +--ro nis-plus-paras
               |  |  +--ro nis-plus-domain-name   string
               |  |  +--ro nis-plus-server* [nis-plus-serv-id]
               |  |     +--ro nis-plus-serv-id    uint8
               |  |     +--ro nis-plus-serv-addr  inet:ipv6-address
               |  +--ro info-refresh-time         yang:timeticks



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               |  +--ro time-zone-paras
               |  |  +--ro tz-posix               string
               |  |  +--ro tz-database            string
               |  +--ro cli-fqdn                  string
               |  +--ro ntp-paras
               |  |  +--ro ntp-server* [ntp-serv-id]
               |  |     +--ro ntp-serv-id         uint8
               |  |     +--ro ntp-serv-addr       inet:ipv6-address
               |  |     +--ro ntp-serv-mul-addr   inet:ipv6-address
               |  |     +--ro ntp-serv-fqdn       string
               |  +--ro sntp-paras
               |  |  +--ro sntp-server* [sntp-serv-id]
               |  |     +--ro sntp-serv-id         uint8
               |  |     +--ro sntp-serv-addr       inet:ipv6-address
               |  +--ro network-boot-paras
               |  |  +--ro boot-file* [boot-file-id]
               |  |     +--ro boot-file-id           uint8
               |  |     +--ro suitable-arch-type*    uint16
               |  |     +--ro suitable-net-if*       uint32
               |  |     +--ro boot-file-url          string
               |  |     +--ro boot-file-paras* [para-id]
               |  |        +--ro para-id             uint8
               |  |        +--ro parameter           string
               |  +--ro kerberos-paras
               |  |  +--ro default-realm-name        string
               |  |  +--ro kdc-info* [kdc-id]
               |  |     +--ro kdc-id                 uint8
               |  |     +--ro priority               uint16
               |  |     +--ro weight                 uint16
               |  |     +--ro transport-type         uint8
               |  |     +--ro port-number            uint16
               |  |     +--ro kdc-ipv6-addr          inet:ipv6-address
               |  |     +--ro realm-name             string
               |  +--ro addr-selection-paras
               |  |  +--ro automatic-row-add         boolean
               |  |  +--ro prefer-temporary-addr     boolean
               |  |  +--ro policy-table* [policy-id]
               |  |     +--ro policy-id              uint8
               |  |     +--ro label                  uint8
               |  |     +--ro precedence             uint8
               |  |     +--ro prefix-len             uint8
               |  |     +--ro prefix                 inet:ipv6-prefix
               |  +--ro sol-max-rt                   yang:timeticks
               |  +--ro inf-max-rt                   yang:timeticks
               |  +--ro pcp-paras
               |  |  +--ro pcp-server* [pcp-serv-id]
               |  |     +--ro pcp-serv-id            uint8
               |  |     +--ro pcp-serv-addr          inet:ipv6-address



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               |  +--ro s46-rule-paras
               |  |  +--ro s46-rule* [rule-id]
               |  |     +--ro rule-id                uint8
               |  |     +--ro rule-type              enumeration
               |  |     +--ro ea-len                 uint8
               |  |     +--ro prefix4-len            uint8
               |  |     +--ro ipv4-prefix            inet:ipv4-prefix
               |  |     +--ro prefix6-len            uint8
               |  |     +--ro ipv6-prefix            inet:ipv6-prefix
               |  |     +--ro port-parameter
               |  |        +--ro offset              uint8
               |  |        +--ro psid-len            uint8
               |  |        +--ro psid                uint16
               |  +--ro s46-br-paras
               |  |  +--ro br* [br-id]
               |  |     +--ro br-id                  uint8
               |  |     +--ro br-ipv6-addr           inet:ipv6-address
               |  +--ro s46-dmr-paras
               |  |  +--ro dmr* [dmr-id]
               |  |     +--ro dmr-id                 uint8
               |  |     +--ro dmr-prefix6-len        uint8
               |  |     +--ro dmr-ipv6-prefix        inet:ipv6-prefix
               |  +--ro s46-v4-v6-binding-paras
               |  |  +--ro ipv4-addr                 inet:ipv6-address
               |  |  +--ro bind-prefix6-len          uint8
               |  |  +--ro port-parameter
               |  |     +--ro offset                 uint8
               |  |     +--ro psid-len               uint8
               |  |     +--ro psid                   uint16
               |  +--ro erp-local-domain-name        string
               +--ro supported-options
               |  +--ro supported-option* [option-code]
               |     +--ro option-code            uint16
               |     +--ro description            string
               +--ro packet-stats
                  +--ro solicit-count             uint32
                  +--ro request-count             uint32
                  +--ro renew-count               uint32
                  +--ro rebind-count              uint32
                  +--ro decline-count             uint32
                  +--ro release-count             uint32
                  +--ro info-req-count            uint32
                  +--ro advertise-count           uint32
                  +--ro confirm-count             uint32
                  +--ro reply-count               uint32
                  +--ro reconfigure-count         uint32

   Introduction of important nodes:



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   o  client-interfaces: A client may have several interfaces, it is
      more reasonable to configure and manage parameters on the
      interface-level.  This container includes configuration and state
      data of a DHCPv6 client in a per-interface manner.

   o  client-if: The list defines a specific client interface and its
      data.  Different interfaces are distinguished by the "ifName" key
      which is a configurable string value.

   o  duid: Each server and client has only one DUID (DHCP Unique
      Identifier).  The DUID here will be carried in the Client ID
      option to identify a specific DHCPv6 client.  This container are
      same as the "duid" container in "dhcpv6-server" feature.

   o  pd-function: Whether the client can act as a requesting router to
      request prefixes using prefix delegation ([RFC3633]).

   o  rapid-commit: '1' indicates a client can initiate a Solicit-Reply
      message exchange by adding a Rapid Commit option in Solicit
      message. '0' means the client is not allowed to add a Rapid Commit
      option to request addresses in a two-message exchange pattern.

   o  mo-tab: The management tab label indicates the operation mode of
      the DHCPv6 client. 'm'=1 and 'o'=1 indicate the client will use
      DHCPv6 to obtain all the configuration data. 'm'=1 and 'o'=0 are a
      meaningless combination.  'm'=0 and 'o'=1 indicate the client will
      use stateless DHCPv6 to obtain configuration data apart from
      addresses/prefixes data. 'm'=0 and 'o'=0 represent the client will
      not use DHCPv6 but use SLAAC to achieve configuration.

   o  oro-options: This container provide a way to configure the list of
      options that the client will request in its ORO option.

   o  client-configured-options: Similar to the server, the client also
      need to configure some options to fulfil some desired functions.
      This container include all the potential options that need to be
      configured at the client side.  The relevant RFCs that define
      those options include: [RFC3315], [RFC4704], [RFC5970], [RFC6784],
      [RFC6939].

   o  identity-association: IA is a construct through which a server and
      a client can identify, group, and manage a set of related IPv6
      addresses.  The key of the "identity-association" list is a 4-byte
      number IAID defined in [RFC3315] .

   o  if-other-paras: A client can obtain extra configuration data other
      than address and prefix information through DHCPv6 options.  This
      container describes such data the client was configured through



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      DHCPv6.  The potential configuration data may include DNS server
      parameters, SIP server parameters and etc.

   o  supported-options: This state data container defines a list of
      options supported by the client for administrator to interrogate a
      client's capabilities.

   o  packet-stats: A container records all the packet status
      information of a specific interface.

3.4.  Notifications Mechanism for DHCPv6

   +--rw dhcpv6
      +-- ...
      |
      +--n notifications
         +--n dhcpv6-server-event                 {dhcpv6-server}?
         |  +--n pool-running-out
         |  |  +--ro utilization-ratio            uint16
         |  |  +--ro duid
         |  |  |  +--ro duid-type                 uint16
         |  |  |  +--ro duid-high-1               uint32
         |  |  |  +--ro duid-high-2               uint32
         |  |  |  +--ro duid-low-1                uint32
         |  |  |  +--ro duid-low-2                uint32
         |  |  +--ro serv-name?                   string
         |  |  +--ro pool-name                    string
         |  +--n invalid-client-detected
         |     +--ro duid
         |     |  +--ro duid-type                 uint16
         |     |  +--ro duid-high-1               uint32
         |     |  +--ro duid-high-2               uint32
         |     |  +--ro duid-low-1                uint32
         |     |  +--ro duid-low-2                uint32
         |     +--ro description?                 string
         +--n dhcpv6-relay-event                  {dhcpv6-relay}?
         |  +--n topo-changed
         |     +--ro relay-if-name                string
         |     +--ro first-hop                    boolean
         |     +--ro last-entity-addr             inet:ipv6-address
         +--n dhcpv6-client-event                 {dhcpv6-client}?
            +--n ia-lease-event
            |  +--ro event-type                   enumeration
            |  +--ro duid
            |  |  +--ro duid-type                 uint16
            |  |  +--ro duid-high-1               uint32
            |  |  +--ro duid-high-2               uint32
            |  |  +--ro duid-low-1                uint32



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            |  |  +--ro duid-low-2                uint32
            |  +--ro iaid                         uint32
            |  +--ro serv-name?                   string
            |  +--ro description?                 string
            +--n invalid-ia-detected
            |  +--ro duid
            |  |  +--ro duid-type                 uint16
            |  |  +--ro duid-high-1               uint32
            |  |  +--ro duid-high-2               uint32
            |  |  +--ro duid-low-1                uint32
            |  |  +--ro duid-low-2                uint32
            |  +--ro iaid                         uint32
            |  +--ro serv-name?                   string
            |  +--ro description?                 string
            +--n retransmission-failed
            |  +--ro duid
            |  |  +--ro duid-type                 uint16
            |  |  +--ro duid-high-1               uint32
            |  |  +--ro duid-high-2               uint32
            |  |  +--ro duid-low-1                uint32
            |  |  +--ro duid-low-2                uint32
            |  +--ro description                  enumeration
            +--n failed-status-turn-up
               +--ro duid
               |  +--ro duid-type                 uint16
               |  +--ro duid-high-1               uint32
               |  +--ro duid-high-2               uint32
               |  +--ro duid-low-1                uint32
               |  +--ro duid-low-2                uint32
               +--ro status-code                  enumeration

   Introduction of notifications:

   o  pool-running-out: raised when the address/prefix pool is going to
      run out.  A threshold for utilization ratio of the pool has been
      defined in the server feature so that it will notify the
      administrator when the utilization ratio reaches the threshold,
      and such threshold is a settable parameter.

   o  ia-lease-event: raised when the client was allocated a new IA from
      the server or it renew/rebind/release its current IA.

   o  invalid-client-detected: raised when the server has found a client
      which can be regarded as a potential attacker.  Some description
      could also be included.

   o  topo-changed: raised when the topology of the relay agent is
      changed.



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   o  invalid-ia-detected: raised when the identity association of the
      client can be proved to be invalid.  Possible condition includes
      duplicated address, illegal address, etc.

   o  retransmission-failed: raised when the retransmission mechanism
      defined in [RFC3315] is failed.

   o  failed-status-turn-up: raised when the client receives a message
      includes an unsuccessful Status Code option.

4.  DHCPv6 YANG Model

   This module imports typedefs from [RFC6991].

<CODE BEGINS> file "ietf-dhcpv6@2015-07-01.yang"

module ietf-dhcpv6 {
    namespace "urn:ietf:params:xml:ns:yang:dhc:dhcpv6";
    prefix "dhcpv6";

    import ietf-inet-types {
        prefix inet;
        revision-date "2013-07-15";
    }
    import ietf-yang-types {
        prefix yang;
        revision-date "2013-07-15";
    }

    organization "dhc wg";
    contact "yong@csnet1.cs.tsinghua.edu.cn
            wangh13@mails.tsinghua.edu.cn
            lh.sunlinh@gmail.com
            Ted.Lemon@nominum.com
            ian.farrer@telekom.de";

    description "This model defines a YANG data model that can be used to configure and manage DHCPv6 server, DHCPv6 relay and DHCPv6 client.";

    revision 2015-07-01 { description "version03: Correct grammar errors."; }
    revision 2015-04-13 { description "version02: Correct grammar errors."; }
    revision 2015-04-02 { description "version01: Correct grammar errors, Reuse groupings, Update 'dhcpv6-realy' feature, Add notifications.";}
    revision 2015-03-04 { description "Initial revision."; }

/*
 * Features
 */

    feature dhcpv6-server {



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        description
            "Server in DHCPv6.";
        reference
            "RFC3315";
    }

    feature dhcpv6-relay {
        description
            "Relay agent in DHCPv6.";
        reference
            "RFC3315";
    }

    feature dhcpv6-client {
        description
             "Client in DHCPv6.";
        reference
               "RFC3315";
    }
/*
 * Typedef
 */

    typedef threshold {
        description "Threshold value in percent";
        type union {
            type uint16 {
                range 0..100;
            }
            type enumeration {
                enum "disabled" {
                    description "No threshold";
                }
            }
        }
    }
/*
 * Grouping
 */

    grouping vendor-infor {
        container vendor-info {
            description "";
            leaf ent-num {
                mandatory true;
                type uint32;
            }
            leaf-list data {



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                type string;
            }
        }
    }

    grouping portset-para {
        container port-parameter {
            leaf offset {
                mandatory true;
                type uint8;
            }
            leaf psid-len {
                mandatory true;
                type uint8;
            }
            leaf psid {
                mandatory true;
                type uint16;
            }
        }
    }

    grouping duid-para {
        container duid {
            leaf duid-type {
                mandatory true;
                type uint16;
            }
            leaf duid-high-1 {
                mandatory true;
                type uint32;
            }
            leaf duid-high-2 {
                mandatory true;
                type uint32;
            }
            leaf duid-low-1 {
                mandatory true;
                type uint32;
            }
            leaf duid-low-2 {
                mandatory true;
                type uint32;
            }
        }
    }

/*



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 * Data Nodes
 */

    container server {
        if-feature dhcpv6-server;
        container serv-attributes {
            description "This container contains basic attributes of a DHCPv6 server such as DUID, server name and so on. Some optional functions that can be provided by the server is also included.";
            leaf name {
                mandatory true;
                type string;
            }
            container duid {
                leaf duid-type {
                    mandatory true;
                    type uint16;
                }
                leaf duid-high-1 {
                    mandatory true;
                    type uint32;
                }
                leaf duid-high-2 {
                    mandatory true;
                    type uint32;
                }
                leaf duid-low-1 {
                    mandatory true;
                    type uint32;
                }
                leaf duid-low-2 {
                    mandatory true;
                    type uint32;
                }
                leaf enable {
                    mandatory true;
                    type boolean;
                }
                leaf ipv6-address {
                    mandatory true;
                    type inet:ipv6-address;
                }
                leaf description {
                    type string;
                }
                leaf pd-function {
                    description "Whether the server can act as a delegating router to perform prefix delegation ([RFC3633]).";
                    mandatory true;
                    type boolean;
                }



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                leaf stateless-service {
                    description "A boolean value specifies whether the server support client-server exchanges involving two messages defined in ([RFC3315]).";
                    mandatory true;
                    type boolean;
                }
                leaf rapid-commit {
                    description "A boolean value specifies whether the server support client-server exchanges involving two messages defined in ([RFC3315]).";
                    mandatory true;
                    type boolean;
                }
                leaf store-client-link-layer {
                    description ".";
                    type boolean;
                }
                uses vendor-infor;
            }
            container option-sets {
                list option-set {
                    key option-set-id;
                    leaf option-set-id {
                        mandatory true;
                        type uint8;
                    }
                    leaf user-class-value {
                        type string;
                    }
                    leaf enterprise-number {
                        type uint32;
                    }
                    leaf store-client-link-layer {
                        type boolean;
                    }
                    container preference-option {
                        leaf enable {
                            mandatory true;
                            type boolean;
                        }
                        leaf preference-value {
                            mandatory true;
                            type uint8;
                        }
                    }
                    container sip-server-option {
                        leaf enable {
                            mandatory true;
                            type boolean;
                        }
                        list sip-server {



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                            key sip-serv-id;
                            leaf sip-serv-id {
                                mandatory true;
                                type uint8;
                            }
                            leaf sip-serv-domain-name {
                                mandatory true;
                                type string;
                            }
                            leaf sip-serv-addr {
                                mandatory true;
                                type inet:ipv6-address;
                            }
                        }
                    }
                    container dns-config-option {
                        leaf enable {
                            mandatory true;
                            type boolean;
                        }
                        list dns-server {
                            key dns-serv-id;
                            leaf dns-serv-id {
                                mandatory true;
                                type uint8;
                            }
                            leaf dns-serv-addr {
                                mandatory true;
                                type inet:ipv6-address;
                            }
                        }
                        leaf domain-search-list {
                            mandatory true;
                            type string;
                        }
                    }
                    container nis-config-option {
                        leaf enable {
                            mandatory true;
                            type boolean;
                        }
                        list nis-server {
                            key nis-serv-id;
                            leaf nis-serv-id {
                                mandatory true;
                                type uint8;
                            }
                            leaf nis-serv-addr {



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                                mandatory true;
                                type inet:ipv6-address;
                            }
                        }
                    }
                    container nis-plus-config-option {
                        leaf enable {
                            mandatory true;
                            type boolean;
                        }
                        list nis-plus-server {
                            key nis-plus-serv-id;
                            leaf nis-plus-serv-id {
                                mandatory true;
                                type uint8;
                            }
                            leaf nis-plus-serv-addr {
                                mandatory true;
                                type inet:ipv6-address;
                            }
                        }
                    }
                    container info-refresh-time-option {
                        leaf enable {
                            mandatory true;
                            type boolean;
                        }
                        leaf info-refresh-time {
                            mandatory true;
                            type yang:timeticks;
                        }
                    }
                    container cli-fqdn-option {
                        leaf enable {
                            mandatory true;
                            type boolean;
                        }
                        leaf server-initiate-update {
                            mandatory true;
                            type boolean;
                        }
                        leaf client-initiate-update {
                            mandatory true;
                            type boolean;
                        }
                        leaf modify-name-from-cli {
                            mandatory true;
                            type boolean;



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                        }
                    }
                    container timezone-option {
                        leaf enable {
                            mandatory true;
                            type boolean;
                        }
                        leaf tz-posix {
                            mandatory true;
                            type string;
                        }
                        leaf tz-database {
                            mandatory true;
                            type string;
                        }
                    }
                    container ntp-server-option {
                        leaf enable {
                            mandatory true;
                            type boolean;
                        }
                        list ntp-server {
                            key ntp-serv-id;
                            leaf ntp-serv-id {
                                mandatory true;
                                type uint8;
                            }
                            leaf ntp-serv-addr {
                                mandatory true;
                                type inet:ipv6-address;
                            }
                            leaf ntp-serv-mul-addr {
                                mandatory true;
                                type inet:ipv6-address;
                            }
                            leaf ntp-serv-fqdn {
                                mandatory true;
                                type string;
                            }
                        }
                    }
                    container sntp-server-option {
                        leaf enable {
                            mandatory true;
                            type boolean;
                        }
                        list sntp-server {
                            key sntp-serv-id;



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                            leaf sntp-serv-id {
                                mandatory true;
                                type uint8;
                            }
                            leaf sntp-serv-addr {
                                mandatory true;
                                type inet:ipv6-address;
                            }
                        }
                    }
                    container network-boot-option {
                        leaf enable {
                            mandatory true;
                            type boolean;
                        }
                        list boot-file {
                            key boot-file-id;
                            leaf boot-file-id {
                                mandatory true;
                                type uint8;
                            }
                            leaf-list suitable-arch-type {
                                type uint16;
                            }
                            leaf-list suitable-net-if {
                                type uint32;
                            }
                             leaf boot-file-url {
                                mandatory true;
                                type string;
                            }
                            list boot-file-paras {
                                key para-id;
                                leaf id {
                                    mandatory true;
                                    type uint8;
                                }
                                    leaf parameter {
                                    mandatory true;
                                    type string;
                                    }
                            }
                        }
                    }
                    container dslite-option {
                        leaf enable {
                            mandatory true;
                            type boolean;



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                        }
                        leaf dslite-aftr-name {
                            mandatory true;
                            type string;
                        }
                    }
                    container kerveros-option {
                        leaf enable {
                            mandatory true;
                            type boolean;
                        }
                        leaf default-realm-name {
                            mandatory true;
                            type string;
                        }
                        list kdc-info {
                            key kdc-id;
                            leaf kdc-id {
                                mandatory true;
                                type uint8;
                            }
                            leaf priority {
                                mandatory true;
                                type uint16;
                            }
                            leaf weight {
                                mandatory true;
                                type uint16;
                            }
                            leaf transport-type {
                                mandatory true;
                                type uint8;
                            }
                            leaf port-number {
                                mandatory true;
                                type uint16;
                            }
                            leaf kdc-ipv6-addr {
                                mandatory true;
                                type inet:ipv6-address;
                            }
                            leaf realm-name {
                                mandatory true;
                                type string;
                            }
                        }
                    }
                    container addr-selection-option {



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                        leaf enable {
                            mandatory true;
                            type boolean;
                        }
                        leaf a-bit-set {
                            description "";
                            mandatory true;
                            type boolean;
                        }
                        leaf p-bit-set {
                            mandatory true;
                            type boolean;
                        }
                        list policy-table {
                            key policy-id;
                            leaf policy-id {
                                mandatory true;
                                type uint8;
                            }
                            leaf label {
                                mandatory true;
                                type uint8;
                            }
                            leaf precedence {
                                mandatory true;
                                type uint8;
                            }
                            leaf prefix-len {
                                mandatory true;
                                type uint8;
                            }
                            leaf prefix {
                                mandatory true;
                                type inet:ipv6-prefix;
                            }
                        }
                    }
                    container sol-max-rt-option {
                        leaf enable {
                            mandatory true;
                            type boolean;
                        }
                        leaf sol-max-rt-value {
                            mandatory true;
                            type yang:timeticks;
                        }
                    }
                    container inf-max-rt-option {



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                        leaf enable {
                            mandatory true;
                            type boolean;
                        }
                        leaf inf-max-rt-value {
                            mandatory true;
                            type yang:timeticks;
                        }
                    }
                    container pcp-server-option {
                        leaf enable {
                            mandatory true;
                            type boolean;
                        }
                        list pcp-server {
                            key pcp-serv-id;
                            leaf pcp-serv-id {
                                mandatory true;
                                type uint8;
                            }
                            leaf pcp-serv-addr {
                                mandatory true;
                                type inet:ipv6-address;
                            }
                        }
                    }
                    container s46-rule-option {
                        leaf enable {
                            mandatory true;
                            type boolean;
                        }
                        list s46-rule {
                            key rule-id;
                            leaf rule-id {
                                mandatory true;
                                type uint8;
                            }
                            leaf rule-type {
                                mandatory true;
                                type enumeration {
                                enum "BMR";
                                enum "FMR";
                                }
                            }
                            leaf prefix4-len {
                                mandatory true;
                                type uint8;
                            }



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                            leaf ipv4-prefix {
                                mandatory true;
                                type inet:ipv4-prefix;
                            }
                            leaf prefix6-len {
                                mandatory true;
                                type uint8;
                            }
                            leaf ipv6-prefix {
                                mandatory true;
                                type inet:ipv6-prefix;
                            }
                            uses portset-para;
                        }
                    }
                    container s46-br-option {
                        leaf enable {
                            mandatory true;
                            type boolean;
                        }
                        list br {
                            key br-id;
                            leaf br-id {
                                mandatory true;
                                type uint8;
                            }
                            leaf br-ipv6-addr {
                                mandatory true;
                                type inet:ipv6-address;
                            }
                        }
                    }
                    container s46-dmr-option {
                        leaf enable {
                            description "";
                            mandatory true;
                            type boolean;
                        }
                        list dmr {
                            key dmr-id;
                            leaf dmr-id {
                                mandatory true;
                                type uint8;
                            }
                            leaf dmr-prefix-len {
                                mandatory true;
                                type uint8;
                            }



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                            leaf dmr-ipv6-prefix {
                                mandatory true;
                                type inet:ipv6-prefix;
                            }
                        }
                    }
                    container s46-v4-v6-binding-option {
                        leaf enable {
                            mandatory true;
                            type boolean;
                        }
                        list ce {
                            key ce-id;
                            leaf ce-id {
                                mandatory true;
                                type uint8;
                            }
                            leaf ipv4-addr {
                                mandatory true;
                                type inet:ipv4-address;
                            }
                            leaf bind-prefix6-len {
                                mandatory true;
                                type uint8;
                            }
                            leaf bind-ipv6-prefix {
                                mandatory true;
                                type inet:ipv6-prefix;
                            }
                            uses portset-para;
                        }
                    }
                 }
            }
            container network-range {
                leaf-list option-set {
                    type uint8;
                }
                list network-range {
                    key network-range-id;
                    leaf network-range-id {
                        mandatory true;
                        type uint8;
                    }
                    leaf network-description {
                        mandatory true;
                        type string;
                    }



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                    leaf network-prefix {
                        mandatory true;
                        type inet:ipv6-prefix;
                    }
                    leaf inherit-option-set {
                        mandatory true;
                        type boolean;
                    }
                    leaf-list option-set {
                        type uint8;
                    }
                    container address-pools {
                        description "A container describes the DHCPv6 server's address pools.";
                        list address-pool {
                            description "A DHCPv6 server can be configured with several address pools. This list defines such address pools which are distinguish by the key called 'pool-name'.";
                            key pool-id;
                            leaf pool-id {
                                mandatory true;
                                type uint8;
                            }
                            leaf pool-prefix {
                                mandatory true;
                                type inet:ipv6-prefix;
                            }
                            leaf start-address {
                                mandatory true;
                                type inet:ipv6-address-no-zone;
                            }
                            leaf end-address {
                                mandatory true;
                                type inet:ipv6-address-no-zone;
                            }
                            leaf preferred-lifetime {
                                mandatory true;
                                type yang:timeticks;
                            }
                            leaf valid-lifetime {
                                mandatory true;
                                type yang:timeticks;
                            }
                            leaf total-ipv6-count {
                                config "false";
                                mandatory true;
                                type uint64;
                            }
                            leaf used-ipv6-count {
                                config "false";
                                mandatory true;



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                                type uint64;
                            }
                            leaf utilization-ratio {
                                mandatory true;
                                type threshold;
                            }
                            leaf inherit-option-set {
                                mandatory true;
                                type boolean;
                            }
                            leaf-list option-set {
                                type uint8;
                            }
                            container reserved-addresses {
                                list static-binding {
                                    key cli-id;
                                    leaf cli-id {
                                        mandatory true;
                                        type uint32;
                                    }
                                    uses duid-para;
                                    leaf-list reserv-addr {
                                        type inet:ipv6-address;
                                    }
                                }
                                leaf-list other-reserv-addr {
                                    type inet:ipv6-address;
                                }
                            }
                        }
                        list binding-info {
                            config "false";
                            description "A list records a binding information for each DHCPv6 client that has already been allocated IPv6 addresses.";
                            key cli-id;
                            leaf cli-id {
                                mandatory true;
                                type uint32;
                            }
                            uses duid-para;
                            list cli-ia {
                                key iaid;
                                leaf ia-type {
                                    mandatory true;
                                    type string;
                                }
                                leaf iaid {
                                    mandatory true;
                                    type string;



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                                }
                                leaf-list cli-addr {
                                    type inet:ipv6-address;
                                }
                                leaf pool-id {
                                    mandatory true;
                                    type uint8;
                                }
                            }
                        }
                    }
                    container prefix-pools {
                        description "If a server supports prefix delegation function, this container will be used to define the delegating router's refix pools.";
                        list prefix-pool {
                            description "Similar to server's address pools, a delegating router can also be configured with multiple prefix pools specified by a list called 'prefix-pool'.";
                            key pool-id;
                            leaf pool-id {
                                mandatory true;
                                type uint8;
                            }
                            leaf prefix {
                                mandatory true;
                                type inet:ipv6-prefix;
                            }
                            leaf prefix-length {
                                mandatory true;
                                type uint8;
                            }
                            leaf preferred-lifetime {
                                mandatory true;
                                type yang:timeticks;
                            }
                            leaf valid-lifetime {
                                mandatory true;
                                type yang:timeticks;
                            }
                            leaf utilization-ratio {
                                mandatory true;
                                type threshold;
                            }
                            leaf inherit-option-set {
                                mandatory true;
                                type boolean;
                            }
                            leaf-list option-set {
                                type uint8;
                            }
                            container reserved-prefixes {



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                                list static-binding {
                                    key cli-id;
                                    leaf cli-id {
                                        mandatory true;
                                        type uint32;
                                    }
                                    uses duid-para;
                                    leaf reserv-prefix-len {
                                        mandatory true;
                                        type uint8;
                                    }
                                    leaf reserv-prefix {
                                        mandatory true;
                                        type inet:ipv6-prefix;
                                    }
                                }
                                leaf exclude-prefix-len {
                                    mandatory true;
                                    type uint8;
                                }
                                leaf exclude-prefix {
                                    mandatory true;
                                    type inet:ipv6-prefix;
                                }
                                list other-reserv-prefix {
                                    key reserv-id;
                                    leaf reserv-id {
                                        mandatory true;
                                        type uint8;
                                    }
                                    leaf prefix-len {
                                        mandatory true;
                                        type uint8;
                                    }
                                    leaf prefix {
                                        mandatory true;
                                        type inet:ipv6-prefix;
                                    }
                                }
                            }
                        }
                        list binding-info {
                            config "false";
                            description "A list records a binding information for each DHCPv6 client that has already been allocated IPv6 addresses.";
                            key cli-id;
                            leaf cli-id {
                                mandatory true;
                                type uint32;



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                            }
                            uses duid-para;
                            list cli-iapd {
                                key iaid;
                                leaf iaid {
                                    mandatory true;
                                    type uint8;
                                }
                                leaf-list cli-prefix {
                                    type inet:ipv6-prefix;
                                }
                                leaf-list cli-prefix-len {
                                    type uint8;
                                }
                                leaf pool-id {
                                    mandatory true;
                                    type uint8;
                                }
                            }
                        }
                    }
                    container hosts {
                        list host {
                            key cli-id;
                            leaf cli-id {
                                mandatory true;
                                type uint32;
                            }
                            uses duid-para;
                            leaf inherit-option-set {
                                mandatory true;
                                type boolean;
                            }
                            leaf-list option-set {
                                type uint8;
                            }
                            leaf nis-domain-name {
                                type string;
                            }
                            leaf nis-plus-domain-name {
                                type string;
                            }
                        }
                    }
                }
            }
            container relay-opaque-paras {
                description "This container contains some opaque values in Relay Agent options that need to be configured on the server side only for value match.



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                Such Relay Agent options include Interface-Id option, Remote-Id
                option and Subscriber-Id option.";
                list relays {
                    key relay-name;
                    leaf relay-name {
                        mandatory true;
                        type string;
                    }
                    list interface-info {
                        key if-name;
                        leaf if-name {
                            mandatory true;
                            type string;
                        }
                        leaf interface-id {
                            mandatory true;
                            type string;
                        }
                    }
                    list subscribers {
                        key subscriber;
                        leaf subscriber {
                            mandatory true;
                            type uint8;
                        }
                        leaf subscriber-id {
                            mandatory true;
                            type string;
                        }
                    }
                    list remote-host {
                        key ent-num;
                        leaf ent-num {
                            mandatory true;
                            type uint32;
                        }
                        leaf remote-id {
                            mandatory true;
                            type string;
                        }
                    }
                }
            }
            container rsoo-enabled-options {
                list rsoo-enable-option{
                    key option-code;
                    leaf option-code {
                        mandatory true;



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                        type uint16;
                    }
                    leaf description {
                        mandatory true;
                        type string;
                    }
                }
            }
            container packet-stats {
                config "false";
                description "A container presents the packet statistics related to the DHCPv6 server.";
                leaf solicit-count {
                    mandatory true;
                    type uint32;
                }
                leaf request-count {
                    mandatory true;
                    type uint32;
                }
                leaf renew-count {
                    mandatory true;
                    type uint32;
                }
                leaf rebind-count {
                    mandatory true;
                    type uint32;
                }
                leaf decline-count {
                    mandatory true;
                    type uint32;
                }
                leaf release-count {
                    mandatory true;
                    type uint32;
                }
                leaf info-req-count {
                    mandatory true;
                    type uint32;
                }
                leaf advertise-count {
                    mandatory true;
                    type uint32;
                }
                leaf confirm-count {
                    mandatory true;
                    type uint32;
                }
                leaf reply-count {



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                    mandatory true;
                    type uint32;
                }
                leaf reconfigure-count {
                    mandatory true;
                    type uint32;
                }
                leaf relay-forward-count {
                    mandatory true;
                    type uint32;
                }
                leaf relay-reply-count {
                    mandatory true;
                    type uint32;
                }
            }
        }
    }
    container relay {
        if-feature dhcpv6-relay;
        container relay-attributes {
            description "A container describes some basic attributes of the relay agent including some relay agent specific options data that need to be configured previously. Such options include Remote-Id option and Subscriber-Id option.";
            leaf name {
                mandatory true;
                type string;
            }
            leaf enable {
                mandatory true;
                type boolean;
            }
            leaf ipv6-address {
                mandatory true;
                type inet:ipv6-address;
            }
            leaf description {
                type string;
            }
            leaf-list dest-addrs {
                description "Each DHCPv6 relay agent may be configured with a list of destination addresses. This node defines such a list of IPv6 addresses that may include unicast addresses, multicast addresses or other addresses.";
                type inet:ipv6-address;
            }
            list subscribers {
                key subscriber;
                leaf subscriber {
                    mandatory true;
                    type uint8;
                }
                leaf subscriber-id {



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                    mandatory true;
                    type string;
                }
            }
            list remote-host {
                key ent-num;
                leaf ent-num {
                    mandatory true;
                    type uint32;
                }
                leaf remote-id {
                    mandatory true;
                    type string;
                }
            }
            uses vendor-infor;
            container relay-supplied-options-option {
                list rsoo-set {
                    key rsoo-set-id;
                    leaf rsoo-set-id {
                        mandatory true;
                        type uint8;
                    }
                    container erp-local-domain-name-option {
                        leaf enable {
                            mandatory true;
                            type boolean;
                        }
                        list erp-for-client {
                            key cli-id;
                            leaf cli-id {
                                mandatory true;
                                type uint32;
                            }
                            uses duid-para;
                            leaf erp-name {
                                mandatory true;
                                type string;
                            }
                        }
                    }
                }
            }
            container relay-interfaces {
                description "It is a container that defines common configuration and state parameters in the interfaces of a DHCPv6 relay agent. In this YANG data model for DHCPv6 relay agent, the parameters are configured in a per-interface manner.";
                list relay-if {
                    description "A list describes a specific interface and its corresponding parameters. Here we use a string called 'ifName' as the key of list.";
                    key if-name;



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                    leaf if-name {
                        mandatory true;
                        type string;
                    }
                    leaf enable {
                        mandatory true;
                        type boolean;
                    }
                    leaf interface-id {
                        type string;
                    }
                    leaf-list rsoo-set {
                        type uint8;
                    }
                    list pd-route {
                        key pd-route-id;
                        leaf pd-route-id {
                            mandatory true;
                            type uint8;
                        }
                        leaf requesting-router-id {
                            mandatory true;
                            type uint32;
                        }
                        leaf delegating-router-id {
                            mandatory true;
                            type uint32;
                        }
                        leaf next-router {
                            mandatory true;
                            type inet:ipv6-address;
                        }
                        leaf last-router {
                            mandatory true;
                            type inet:ipv6-address;
                        }
                    }
                    list next-entity {
                        description "This node defines a list that is used to describe the next hop entity of this relay distinguished by their addresses.";
                        key dest-addr;
                        leaf dest-addr {
                            mandatory true;
                            type inet:ipv6-address;
                        }
                        leaf available {
                            mandatory true;
                            type boolean;
                        }



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                        leaf multicast {
                            mandatory true;
                            type boolean;
                        }
                        leaf server {
                            mandatory true;
                            type boolean;
                        }
                        container packet-stats {
                            config "false";
                            leaf cli-packet-rvd-count {
                                mandatory true;
                                type uint32;
                            }
                            leaf solicit-rvd-count {
                                mandatory true;
                                type uint32;
                            }
                            leaf request-rvd-count {
                                mandatory true;
                                type uint32;
                            }
                            leaf renew-rvd-count {
                                mandatory true;
                                type uint32;
                            }
                            leaf rebind-rvd-count {
                                mandatory true;
                                type uint32;
                            }
                            leaf decline-rvd-count {
                                mandatory true;
                                type uint32;
                            }
                            leaf release-rvd-count {
                                mandatory true;
                                type uint32;
                            }
                            leaf info-req-rvd-count {
                                mandatory true;
                                type uint32;
                            }
                            leaf relay-for-rvd-count {
                                mandatory true;
                                type uint32;
                            }
                            leaf relay-rep-rvd-count {
                                mandatory true;



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                                type uint32;
                            }
                            leaf packet-to-cli-count {
                                mandatory true;
                                type uint32;
                            }
                            leaf adver-sent-count {
                                mandatory true;
                                type uint32;
                            }
                            leaf confirm-sent-count {
                                mandatory true;
                                type uint32;
                            }
                            leaf reply-sent-count {
                                mandatory true;
                                type uint32;
                            }
                            leaf reconfig-sent-count {
                                mandatory true;
                                type uint32;
                            }
                            leaf relay-for-sent-count {
                                mandatory true;
                                type uint32;
                            }
                            leaf relay-rep-sent-count {
                                mandatory true;
                                type uint32;
                            }
                        }
                    }
                }
            }
            container relay-stats {
                config "false";
                leaf cli-packet-rvd-count {
                    mandatory true;
                    type uint32;
                }
                leaf relay-for-rvd-count {
                    mandatory true;
                    type uint32;
                }
                leaf relay-rep-rvd-count {
                    mandatory true;
                    type uint32;
                }



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                leaf packet-to-cli-count {
                    mandatory true;
                    type uint32;
                }
                leaf relay-for-sent-count {
                    mandatory true;
                    type uint32;
                }
                leaf relay-rep-sent-count {
                    mandatory true;
                    type uint32;
                }
                leaf discarded-packet-count {
                    mandatory true;
                    type uint32;
                }
            }
        }
    }
    container client {
        if-feature dhcpv6-client;
        container client-interfaces {
            description "A client may have several interfaces, it is more reasonable to configure and manage parameters on the interface-level. This container includes configuration and state data of a DHCPv6 client in a per-interface manner.";
            list client-if {
                description "The list defines a specific client interface and its data. Different interfaces are distinguished by the key which is a configurable string value.";
                key if-name;
                leaf if-name {
                    mandatory true;
                    type string;
                }
                leaf cli-id {
                    mandatory true;
                    type uint32;
                }
                uses duid-para;
                leaf enable {
                    mandatory true;
                    type boolean;
                }
                leaf description {
                    type string;
                }
                leaf pd-function {
                    description "Whether the client can act as a requesting router to request prefixes using prefix delegation ([RFC3633]).";
                    mandatory true;
                    type boolean;
                }
                leaf rapid-commit {



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                    description "'1' indicates a client can initiate a Solicit-Reply message exchange by adding a Rapid Commit option in Solicit message. '0' means the client is not allowed to add a Rapid Commit option to request addresses in a two-message exchange pattern.";
                    mandatory true;
                    type boolean;
                }
                container mo-tab {
                    description "The management tab label indicates the operation mode of the DHCPv6 client. 'm'=1 and 'o'=1 indicate the client will use DHCPv6 to obtain all the configuration data. 'm'=1 and 'o'=0 are a meaningless combination. 'm'=0 and 'o'=1 indicate the client will use stateless DHCPv6 to obtain configuration data apart from addresses/prefixes data. 'm'=0 and 'o'=0 represent the client will not use DHCPv6 but use SLAAC to achieve configuration.";
                    leaf m-tab {
                        mandatory true;
                        type boolean;
                    }
                    leaf o-tab {
                        mandatory true;
                        type boolean;
                    }
                }
                container oro-options {
                    list oro-option {
                        key option-code;
                        leaf option-code {
                            mandatory true;
                            type uint16;
                        }
                        leaf description {
                            mandatory true;
                            type string;
                        }
                    }
                }
                container client-cofigured-options {
                    container user-class-option {
                        leaf enable {
                            mandatory true;
                            type boolean;
                        }
                        list user-class {
                            key user-class-id;
                            leaf user-class-id {
                                mandatory true;
                                type uint8;
                            }
                            leaf user-class-info {
                                mandatory true;
                                type string;
                            }
                        }
                    }
                    container vendor-class-option {
                        leaf enable {



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                            mandatory true;
                            type boolean;
                        }
                        leaf ent-num {
                            mandatory true;
                            type uint32;
                        }
                        leaf-list data {
                            type string;
                        }
                    }
                    container client-fqdn-option {
                        leaf enable {
                            mandatory true;
                            type boolean;
                        }
                        leaf fqdn {
                            mandatory true;
                            type string;
                        }
                        leaf server-initiate-update {
                            mandatory true;
                            type boolean;
                        }
                        leaf client-initiate-update {
                            mandatory true;
                            type boolean;
                        }
                    }
                    container client-architecture-type-option {
                        leaf enable {
                            mandatory true;
                            type boolean;
                        }
                        list architecture-types {
                            key type-id;
                            leaf type-id {
                                mandatory true;
                                type uint16;
                            }
                            leaf most-preferred {
                                mandatory true;
                                type boolean;
                            }
                        }
                    }
                    container client-network-interface-option {
                        leaf enable {



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                            mandatory true;
                            type boolean;
                        }
                        leaf type {
                            mandatory true;
                            type uint8;
                        }
                        leaf major {
                            mandatory true;
                            type uint8;
                        }
                        leaf minor {
                            mandatory true;
                            type uint8;
                        }
                    }
                    container kerberos-principal-name-option {
                        leaf enable {
                            mandatory true;
                            type boolean;
                        }
                        leaf principal-name {
                            mandatory true;
                            type string;
                        }
                    }
                    container client-link-layer-addr-option {
                        leaf enable {
                            mandatory true;
                            type boolean;
                        }
                        leaf link-layer-type {
                            mandatory true;
                            type uint16;
                        }
                        leaf link-layer-addr {
                            mandatory true;
                            type string;
                        }
                    }
                }
                container identity-associations {
                    config "false";
                    description "IA is a construct through which a server and a client can identify, group, and manage a set of related IPv6 addresses. The key of the list is a 4-byte number IAID defined in [RFC3315] .";
                    list identity-association {
                        key iaid;
                        leaf iaid {
                            mandatory true;



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                            type uint32;
                        }
                        leaf ia-type {
                            mandatory true;
                            type string;
                        }
                        leaf-list ipv6-addr {
                            type inet:ipv6-address;
                        }
                        leaf-list ipv6-prefix {
                            type inet:ipv6-prefix;
                        }
                        leaf-list prefix-length {
                            type uint8;
                        }
                        leaf t1-time {
                            mandatory true;
                            type yang:date-and-time;
                        }
                        leaf t2-time {
                            mandatory true;
                            type yang:date-and-time;
                        }
                        leaf preferred-lifetime {
                            mandatory true;
                            type yang:timeticks;
                        }
                        leaf valid-lifetime {
                            mandatory true;
                            type yang:timeticks;
                        }
                    }
                }
                container if-other-paras {
                    config "false";
                    description "A client can obtain extra configuration data other than address and prefix information through DHCPv6. This container describes such data the client was configured. The potential configuration data may include DNS server addresses, SIP server domain names, etc.";
                    leaf-list uni-dhcpv6-serv-addr {
                        type inet:ipv6-address;
                    }
                    container dns-paras {
                        leaf domain-search-list {
                            mandatory true;
                            type string;
                        }
                        list dns-servers {
                            key dns-serv-id;
                            leaf dns-serv-id {
                                mandatory true;



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                                type uint8;
                            }
                            leaf dns-serv-addr {
                                mandatory true;
                                type inet:ipv6-address;
                            }
                        }
                    }
                    container sip-paras {
                        list sip-servers {
                            key sip-serv-id;
                            leaf sip-serv-id {
                                mandatory true;
                                type uint8;
                            }
                            leaf sip-serv-addr {
                                mandatory true;
                                type inet:ipv6-address;
                            }
                            leaf sip-serv-domain-name {
                                mandatory true;
                                type string;
                            }
                        }
                    }
                    container nis-paras {
                        leaf nis-domain-name {
                            mandatory true;
                            type string;
                        }
                        list nis-server {
                            key nis-serv-id;
                            leaf nip-serv-id {
                                mandatory true;
                                type uint8;
                            }
                            leaf nip-serv-addr {
                                mandatory true;
                                type inet:ipv6-address;
                            }
                        }
                    }
                    container nis-plus-paras {
                        leaf nis-plus-domain-name {
                            mandatory true;
                            type string;
                        }
                        list nis-plus-server {



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                            key nis-plus-serv-id;
                            leaf nip-plus-serv-id {
                                mandatory true;
                                type uint8;
                            }
                            leaf nip-plus-serv-addr {
                                mandatory true;
                                type inet:ipv6-address;
                            }
                        }
                    }
                    leaf info-refresh-time {
                        type yang:timeticks;
                    }
                    container time-zone-paras {
                        leaf tz-posix {
                            mandatory true;
                            type string;
                        }
                        leaf tz-database {
                            mandatory true;
                            type string;
                        }
                    }
                    leaf cli-fqdn {
                        type string;
                    }
                    container ntp-paras {
                        list ntp-server {
                            key ntp-serv-id;
                            leaf ntp-serv-id {
                                mandatory true;
                                type uint8;
                            }
                            leaf ntp-serv-addr {
                                mandatory true;
                                type inet:ipv6-address;
                            }
                            leaf ntp-serv-mul-addr {
                                mandatory true;
                                type inet:ipv6-address;
                            }
                            leaf ntp-serv-fqdn {
                                mandatory true;
                                type string;
                            }
                        }
                    }



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                    container sntp-paras {
                        list sntp-server {
                            key sntp-serv-id;
                            leaf sntp-serv-id {
                                mandatory true;
                                type uint8;
                            }
                            leaf sntp-serv-addr {
                                mandatory true;
                                type inet:ipv6-address;
                            }
                        }
                    }
                    container network-boot-paras {
                        list boot-file {
                            key boot-file-id;
                            leaf boot-file-id {
                                mandatory true;
                                type uint8;
                            }
                            leaf-list suitable-arch-type {
                                type uint16;
                            }
                            leaf-list suitable-net-if {
                                type uint32;
                            }
                            leaf boot-file-url {
                                mandatory true;
                                type string;
                            }
                            list boot-file-paras {
                                key para-id;
                                leaf para-id {
                                    mandatory true;
                                    type uint8;
                                }
                                leaf parameter {
                                    mandatory true;
                                    type string;
                                }
                            }
                        }
                    }
                    container kerveros-paras {
                        leaf default-realm-name {
                            mandatory true;
                            type string;
                        }



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                        list kdc-info {
                            key kdc-id;
                            leaf kdc-id {
                                mandatory true;
                                type uint8;
                            }
                            leaf priority {
                                mandatory true;
                                type uint16;
                            }
                            leaf weight {
                                mandatory true;
                                type uint16;
                            }
                            leaf transport-type {
                                mandatory true;
                                type uint8;
                            }
                            leaf port-number {
                                mandatory true;
                                type uint16;
                            }
                            leaf kdc-ipv6-addr {
                                mandatory true;
                                type inet:ipv6-address;
                            }
                            leaf realm-name {
                                mandatory true;
                                type string;
                            }
                        }
                    }
                    container addr-selection-paras {
                        leaf automatic-row-add {
                            mandatory true;
                            type boolean;
                        }
                        leaf prefer-temporary-addr {
                            mandatory true;
                            type boolean;
                        }
                        list policy-table {
                            key policy-id;
                            leaf policy-id {
                                mandatory true;
                                type uint8;
                            }
                            leaf label {



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                                mandatory true;
                                type uint8;
                            }
                            leaf precedence {
                                mandatory true;
                                type uint8;
                            }
                            leaf prefix-len {
                                mandatory true;
                                type uint8;
                            }
                            leaf prefix {
                                mandatory true;
                                type inet:ipv6-prefix;
                            }
                        }
                    }
                    leaf sol-max-rt {
                        mandatory true;
                        type yang:timeticks;
                    }
                    leaf inf-max-rt {
                        mandatory true;
                        type yang:timeticks;
                    }
                    container pcp-server-paras {
                        list pcp-server {
                            key pcp-serv-id;
                            leaf pcp-serv-id {
                                mandatory true;
                                type uint8;
                            }
                            leaf pcp-serv-addr {
                                mandatory true;
                                type inet:ipv6-address;
                            }
                        }
                    }
                    container s46-rule-paras {
                        list s46-rule {
                            key rule-id;
                            leaf rule-id {
                                mandatory true;
                                type uint8;
                            }
                            leaf rule-type {
                                mandatory true;
                                type enumeration {



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                                enum "BMR";
                                enum "FMR";
                                }
                            }
                            leaf ea-len {
                                mandatory true;
                                type uint8;
                            }
                            leaf prefix4-len {
                                mandatory true;
                                type uint8;
                            }
                            leaf ipv4-prefix {
                                mandatory true;
                                type inet:ipv4-prefix;
                            }
                            leaf prefix6-len {
                                mandatory true;
                                type uint8;
                            }
                            leaf ipv6-prefix {
                                mandatory true;
                                type inet:ipv6-prefix;
                            }
                            uses portset-para;
                        }
                    }
                    container s46-br-paras {
                        list br {
                            key br-id;
                            leaf br-id {
                                mandatory true;
                                type uint8;
                            }
                            leaf br-ipv6-addr {
                                mandatory true;
                                type inet:ipv6-address;
                            }
                        }
                    }
                    container s46-dmr-paras {
                        list dmr {
                            key dmr-id;
                            leaf dmr-id {
                                mandatory true;
                                type uint8;
                            }
                            leaf dmr-prefix-len {



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                                mandatory true;
                                type uint8;
                            }
                            leaf dmr-ipv6-prefix {
                                mandatory true;
                                type inet:ipv6-prefix;
                            }
                        }
                    }
                    container s46-v4-v6-binding-paras {
                        leaf ipv4-addr {
                            mandatory true;
                            type inet:ipv4-address;
                        }
                        leaf bind-prefix6-len {
                            mandatory true;
                            type uint8;
                        }
                        uses portset-para;
                        leaf erp-local-domain-name {
                            mandatory true;
                            type string;
                        }
                    }
                    container supported-options {
                        list supported-option {
                            key option-code;
                            leaf option-code {
                                mandatory true;
                                type uint16;
                            }
                            leaf description {
                                mandatory true;
                                type string;
                            }
                        }
                    }
                }
                container packet-stats {
                    config "false";
                    description "A container records all the packet status information of a specific interface.";
                    leaf solicit-count {
                        mandatory true;
                        type uint32;
                    }
                    leaf request-count {
                        mandatory true;
                        type uint32;



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                    }
                    leaf renew-count {
                        mandatory true;
                        type uint32;
                    }
                    leaf rebind-count {
                        mandatory true;
                        type uint32;
                    }
                    leaf decline-count {
                        mandatory true;
                        type uint32;
                    }
                    leaf release-count {
                        mandatory true;
                        type uint32;
                    }
                    leaf info-req-count {
                        mandatory true;
                        type uint32;
                    }
                    leaf advertise-count {
                        mandatory true;
                        type uint32;
                    }
                    leaf confirm-count {
                        mandatory true;
                        type uint32;
                    }
                    leaf reply-count {
                        mandatory true;
                        type uint32;
                    }
                    leaf reconfigure-count {
                        mandatory true;
                        type uint32;
                    }
                }
            }
        }
    }

/*
 * Notifications
 */

    notification notifications {
        container dhcpv6-server-event {



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            if-feature dhcpv6-server;
            container pool-running-out {
                leaf utilization-ratio {
                    mandatory true;
                    type uint16;
                }
                uses duid-para;
                leaf serv-name {
                    type string;
                }
                leaf pool-name {
                    mandatory true;
                    type string;
                }
            }
            container invalid-client-detected {
                uses duid-para;
                leaf description {
                    type string;
                }
            }
        }
        container dhcpv6-relay-event {
            if-feature dhcpv6-relay;
            container topo-changed {
                leaf relay-if-name {
                    mandatory true;
                    type string;
                }
                leaf first-hop {
                    mandatory true;
                    type boolean;
                }
                leaf last-entity-addr {
                    mandatory true;
                    type inet:ipv6-address;
                }
            }
        }
        container dhcpv6-client-event {
            if-feature dhcpv6-client;
            container ia-lease-event {
                leaf event-type {
                    mandatory true;
                    type enumeration{
                    enum "allocation";
                    enum "rebind";
                    enum "renew";



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                    enum "release";
                    }
                }
                uses duid-para;
                leaf iaid {
                    mandatory true;
                    type uint32;
                }
                leaf serv-name {
                    type string;
                }
                leaf description {
                    type string;
                }
            }
            container invalid-ia-detected {
                uses duid-para;
                leaf cli-duid {
                    mandatory true;
                    type uint32;
                }
                leaf iaid {
                    mandatory true;
                    type uint32;
                }
                leaf serv-name {
                    type string;
                }
                leaf description {
                    type string;
                }
            }
            container retransmission-failed {
                uses duid-para;
                leaf description {
                    mandatory true;
                    type enumeration {
                        enum "MRC failed";
                        enum "MRD failed";
                    }
                }
            }
            container failed-status-turn-up {
                uses duid-para;
                leaf status-code {
                    mandatory true;
                    type enumeration {
                        enum "1" {



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                            description "UnspecFail";
                        }
                        enum "2" {
                            description "NoAddrAvail";
                        }
                        enum "3" {
                            description "NoBinding";
                        }
                        enum "4" {
                            description "NotOnLink";
                        }
                        enum "5" {
                            description "UseMulticast";
                        }
                    }
                }
            }
        }
    }
}
<CODE ENDS>

5.  Security Considerations (TBD)

   TBD

6.  IANA Considerations (TBD)

   TBD

7.  Acknowledgements

   The authors would like to thank Qi Sun, Lishan Li and Sladjana Zoric
   for their valuable contributions to this work.

8.  References

8.1.  Normative References

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119, March 1997.

   [RFC3315]  Droms, R., Bound, J., Volz, B., Lemon, T., Perkins, C.,
              and M. Carney, "Dynamic Host Configuration Protocol for
              IPv6 (DHCPv6)", RFC 3315, July 2003.






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   [RFC3633]  Troan, O. and R. Droms, "IPv6 Prefix Options for Dynamic
              Host Configuration Protocol (DHCP) version 6", RFC 3633,
              December 2003.

   [RFC6020]  Bjorklund, M., "YANG - A Data Modeling Language for the
              Network Configuration Protocol (NETCONF)", RFC 6020,
              October 2010.

   [RFC6087]  Bierman, A., "Guidelines for Authors and Reviewers of YANG
              Data Model Documents", RFC 6087, January 2011.

   [RFC6991]  Schoenwaelder, J., "Common YANG Data Types", RFC 6991,
              July 2013.

8.2.  Informative References

   [I-D.ietf-softwire-map-dhcp]
              Mrugalski, T., Troan, O., Farrer, I., Perreault, S., Dec,
              W., Bao, C., Yeh, L., and X. Deng, "DHCPv6 Options for
              configuration of Softwire Address and Port Mapped
              Clients", draft-ietf-softwire-map-dhcp-12 (work in
              progress), March 2015.

   [RFC3319]  Schulzrinne, H. and B. Volz, "Dynamic Host Configuration
              Protocol (DHCPv6) Options for Session Initiation Protocol
              (SIP) Servers", RFC 3319, July 2003.

   [RFC3646]  Droms, R., "DNS Configuration options for Dynamic Host
              Configuration Protocol for IPv6 (DHCPv6)", RFC 3646,
              December 2003.

   [RFC3898]  Kalusivalingam, V., "Network Information Service (NIS)
              Configuration Options for Dynamic Host Configuration
              Protocol for IPv6 (DHCPv6)", RFC 3898, October 2004.

   [RFC4075]  Kalusivalingam, V., "Simple Network Time Protocol (SNTP)
              Configuration Option for DHCPv6", RFC 4075, May 2005.

   [RFC4242]  Venaas, S., Chown, T., and B. Volz, "Information Refresh
              Time Option for Dynamic Host Configuration Protocol for
              IPv6 (DHCPv6)", RFC 4242, November 2005.

   [RFC4704]  Volz, B., "The Dynamic Host Configuration Protocol for
              IPv6 (DHCPv6) Client Fully Qualified Domain Name (FQDN)
              Option", RFC 4704, October 2006.

   [RFC4833]  Lear, E. and P. Eggert, "Timezone Options for DHCP", RFC
              4833, April 2007.



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   [RFC5908]  Gayraud, R. and B. Lourdelet, "Network Time Protocol (NTP)
              Server Option for DHCPv6", RFC 5908, June 2010.

   [RFC5970]  Huth, T., Freimann, J., Zimmer, V., and D. Thaler, "DHCPv6
              Options for Network Boot", RFC 5970, September 2010.

   [RFC6334]  Hankins, D. and T. Mrugalski, "Dynamic Host Configuration
              Protocol for IPv6 (DHCPv6) Option for Dual-Stack Lite",
              RFC 6334, August 2011.

   [RFC6422]  Lemon, T. and Q. Wu, "Relay-Supplied DHCP Options", RFC
              6422, December 2011.

   [RFC6440]  Zorn, G., Wu, Q., and Y. Wang, "The EAP Re-authentication
              Protocol (ERP) Local Domain Name DHCPv6 Option", RFC 6440,
              December 2011.

   [RFC6784]  Sakane, S. and M. Ishiyama, "Kerberos Options for DHCPv6",
              RFC 6784, November 2012.

   [RFC6939]  Halwasia, G., Bhandari, S., and W. Dec, "Client Link-Layer
              Address Option in DHCPv6", RFC 6939, May 2013.

   [RFC7078]  Matsumoto, A., Fujisaki, T., and T. Chown, "Distributing
              Address Selection Policy Using DHCPv6", RFC 7078, January
              2014.

   [RFC7083]  Droms, R., "Modification to Default Values of SOL_MAX_RT
              and INF_MAX_RT", RFC 7083, November 2013.

   [RFC7291]  Boucadair, M., Penno, R., and D. Wing, "DHCP Options for
              the Port Control Protocol (PCP)", RFC 7291, July 2014.

Authors' Addresses

   Yong Cui
   Tsinghua University
   Beijing  100084
   P.R.China

   Phone: +86-10-6260-3059
   Email: yong@csnet1.cs.tsinghua.edu.cn









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   Hao Wang
   Tsinghua University
   Beijing  100084
   P.R.China

   Phone: +86-10-6278-5822
   Email: wangh13@mails.tsinghua.edu.cn


   Linhui Sun
   Tsinghua University
   Beijing  100084
   P.R.China

   Phone: +86-10-6278-5822
   Email: lh.sunlinh@gmail.com


   Ted Lemon
   Nominum, Inc.
   950 Charter St.
   Redwood City, CA  94043
   USA

   Email: Ted.Lemon@nominum.com


   Ian Farrer
   Deutsche Telekom AG
   CTO-ATI, Landgrabenweg 151
   Bonn, NRW  53227
   Germany

   Email: ian.farrer@telekom.de

















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