module huawei-bras-dhcpv6-server {

    yang-version 1;

    namespace
      "urn:huawei:yang:huawei-bras-dhcpv6-server";

    prefix bras-dhcpv6-server;

    import huawei-ifm {
      prefix ifm;
    }
    import huawei-extension {
      prefix ext;
    }
    import huawei-network-instance {
      prefix ni;
    }
    import huawei-l3vpn {
      prefix l3vpn;
    }
    import ietf-inet-types {
      prefix inet;
    }

    organization
      "Huawei Technologies Co., Ltd.";

    contact
      "Huawei Industrial Base
Bantian, Longgang
Shenzhen 518129
People's Republic of China
Website: http://www.huawei.com
Email: support@huawei.com";

    description
      "Configure the DHCPv6 server.";

    revision "2020-02-22" {
      description
        "Description modification.";
      reference
        "Huawei private.";

    }

    revision "2019-10-17" {
      description "Second revision.";
      reference
        "Huawei private.";

    }

    revision "2019-09-27" {
      description "Init revision.";
      reference
        "Huawei private.";

    }

    ext:task-name "ipv6pool";

    typedef dhcpv6-server-algorithm-type {
      type enumeration {
        enum "master-backup" {
          value 1;
          description
            "Configure the algorithm for selecting DHCPv6 servers as master/backup.";
        }
        enum "loading-share" {
          value 2;
          description
            "Configure the algorithm for selecting DHCPv6 servers as load balancing.";
        }
        enum "polling" {
          value 3;
          description
            "Configure the algorithm for selecting DHCPv6 servers as polling.";
        }
      }
      description
        "DHCPv6 server algorithm type.";
    }

    grouping dhcpv6-server-property {
      description
        "Configure a status (Up/Down) switchover for a DHCPv6 server.";
      leaf dead-count {
        type uint8 {
          range "1..64";
        }
        default "1";
        description
          "Specify the maximum number of times at which the DHCPv6 server does not send response packets.";
      }

      leaf time-out {
        type uint8 {
          range "1..60";
        }
        units "s";
        default "25";
        description
          "Specify a timeout period. If a device receives no response from the DHCPv6 server within the timeout period, it re-sends request packets.";
      }

      leaf dead-time {
        type uint16 {
          range "1..65535";
        }
        units "min";
        default "3";
        description
          "Specify a period within which the DHCPv6 server is down. After the dead-time, the DHCPv6 server is set to up.";
      }
    }  // grouping dhcpv6-server-property

    grouping send-solicit-speed {
      description
        "Configure the rate at which Solicit packets are sent to the DHCPv6 server.";
      container send-solicit-speed {
        must
          "(./packet-number and ./time) or (not(./packet-number) and not(./time))";
        description
          "Configure the rate at which Solicit packets are sent to the DHCPv6 server.";
        leaf packet-number {
          type uint16 {
            range "1..65535";
          }
          description
            "Specify the number of Solicit packets that can be sent within a period.";
        }

        leaf time {
          type uint8 {
            range "1..10";
          }
          units "s";
          description
            "Specify a period of time.";
        }
      }  // container send-solicit-speed
    }  // grouping send-solicit-speed

    container bras-dhcpv6-server {
      description
        "Configure the DHCPv6 server.";
      container dhcpv6-server {
        must
          "count(ips/ip) + count(interfaces/interface) <= 4094";
        description
          "Configure DHCPv6 server.";
        container ips {
          description
            "List of IPv6 addresses for DHCPv6 server.";
          list ip {
            must
              "/bras-dhcpv6-server:bras-dhcpv6-server/bras-dhcpv6-server:dhcpv6-server-groups/bras-dhcpv6-server:dhcpv6-server-group/bras-dhcpv6-server:bind-servers/bras-dhcpv6-server:destination-ips/bras-dhcpv6-server:destination-ip[ipv6-address=current()/ipv6-address][vpn-instance=current()/vpn-instance]";
            key "ipv6-address vpn-instance";
            description
              "Configure IPv6 addresses for a DHCPv6 server.";
            leaf ipv6-address {
              type inet:ipv6-address-no-zone;
              description
                "Specify the IPv6 address for a DHCPv6 server.";
            }

            leaf vpn-instance {
              type leafref {
                path "/ni:network-instance/ni:instances/ni:instance/ni:name";
              }
              must
                "/ni:network-instance/ni:instances/ni:instance[ni:name=current()]/l3vpn:afs/l3vpn:af[l3vpn:type='ipv6-unicast']";
              description
                "Specify the name of a VPN instance. If DHCPv6 server belongs to the public network, vpn-instance can be defined as '_public_'.";
            }

            uses send-solicit-speed;
          }  // list ip
        }  // container ips

        container interfaces {
          description
            "List of outbound interface for DHCPv6 server.";
          list interface {
            must
              "/bras-dhcpv6-server:bras-dhcpv6-server/bras-dhcpv6-server:dhcpv6-server-groups/bras-dhcpv6-server:dhcpv6-server-group/bras-dhcpv6-server:bind-servers/bras-dhcpv6-server:interfaces/bras-dhcpv6-server:interface[name=current()/name]";
            key "name";
            description
              "Configure the outbound interface for DHCPv6 server.";
            leaf name {
              type leafref {
                path "/ifm:ifm/ifm:interfaces/ifm:interface/ifm:name";
              }
              must
                "/ifm:ifm/ifm:interfaces/ifm:interface[ifm:name=current()]/ifm:type='GigabitEthernet' or
/ifm:ifm/ifm:interfaces/ifm:interface[ifm:name=current()]/ifm:type='10GE' or
/ifm:ifm/ifm:interfaces/ifm:interface[ifm:name=current()]/ifm:type='XGigabitEthernet' or
/ifm:ifm/ifm:interfaces/ifm:interface[ifm:name=current()]/ifm:type='100GE' or
/ifm:ifm/ifm:interfaces/ifm:interface[ifm:name=current()]/ifm:type='Virtual-Ethernet' or
/ifm:ifm/ifm:interfaces/ifm:interface[ifm:name=current()]/ifm:type='50GE' or
/ifm:ifm/ifm:interfaces/ifm:interface[ifm:name=current()]/ifm:type='50|100GE' or
/ifm:ifm/ifm:interfaces/ifm:interface[ifm:name=current()]/ifm:type='FlexE' or
/ifm:ifm/ifm:interfaces/ifm:interface[ifm:name=current()]/ifm:type='25GE' or
/ifm:ifm/ifm:interfaces/ifm:interface[ifm:name=current()]/ifm:type='Ethernet' or
/ifm:ifm/ifm:interfaces/ifm:interface[ifm:name=current()]/ifm:type='Eth-Trunk' or
/ifm:ifm/ifm:interfaces/ifm:interface[ifm:name=current()]/ifm:type='LoopBack' or
/ifm:ifm/ifm:interfaces/ifm:interface[ifm:name=current()]/ifm:type='PW-VE' or
/ifm:ifm/ifm:interfaces/ifm:interface[ifm:name=current()]/ifm:type='40GE' or
/ifm:ifm/ifm:interfaces/ifm:interface[ifm:name=current()]/ifm:type='200GE' or
/ifm:ifm/ifm:interfaces/ifm:interface[ifm:name=current()]/ifm:type='400GE' or
/ifm:ifm/ifm:interfaces/ifm:interface[ifm:name=current()]/ifm:type='Vlanif'";
              description
                "Specify the outbound interface for a DHCPv6 server.";
            }

            uses send-solicit-speed;
          }  // list interface
        }  // container interfaces
      }  // container dhcpv6-server

      container dhcpv6-server-groups {
        description
          "List of DHCPv6 server groups.";
        list dhcpv6-server-group {
          key "name";
          max-elements 4096;
          description
            "Configure a DHCPv6 server group.";
          leaf name {
            ext:case-sensitivity "lower-only";
            type string {
              length "1..32";
              pattern '[a-z0-9._-]{1,32}';
            }
            must
              "../name != '-' and ../name != '--'";
            description
              "Specify the name of the DHCPv6 server group.";
          }

          container bind-servers {
            must
              "count(destination-ips/destination-ip) + count(interfaces/interface) <= 8";
            description
              "Configure IPv6 addresses or outbound interfaces and the load balancing weight for a DHCPv6 server.";
            container destination-ips {
              description
                "List of IPv6 addresses and the load balancing weight for a DHCPv6 server.";
              list destination-ip {
                key "ipv6-address vpn-instance";
                description
                  "Configure an IPv6 address and the load balancing weight for a DHCPv6 server.";
                leaf ipv6-address {
                  type leafref {
                    path "/bras-dhcpv6-server:bras-dhcpv6-server/bras-dhcpv6-server:dhcpv6-server/bras-dhcpv6-server:ips/bras-dhcpv6-server:ip/bras-dhcpv6-server:ipv6-address";
                  }
                  description
                    "Specify the IPv6 address for a destination DHCPv6 server.";
                }

                leaf vpn-instance {
                  type leafref {
                    path "/bras-dhcpv6-server:bras-dhcpv6-server/bras-dhcpv6-server:dhcpv6-server/bras-dhcpv6-server:ips/bras-dhcpv6-server:ip[ipv6-address=current()/../ipv6-address]/bras-dhcpv6-server:vpn-instance";
                  }
                  description
                    "Specify the name of a VPN instance. public network vpn-name value is '_public_'.";
                }

                leaf weight {
                  type uint8 {
                    range "0..100";
                  }
                  default "0";
                  description
                    "Specify the load balancing weight for a DHCPv6 server.";
                }
              }  // list destination-ip
            }  // container destination-ips

            container interfaces {
              description
                "List of outbound interface and the load balancing weight for a DHCPv6 server.";
              list interface {
                key "name";
                description
                  "Configure an outbound interface and the load balancing weight for a DHCPv6 server.";
                leaf name {
                  type leafref {
                    path "/bras-dhcpv6-server:bras-dhcpv6-server/bras-dhcpv6-server:dhcpv6-server/bras-dhcpv6-server:interfaces/bras-dhcpv6-server:interface/bras-dhcpv6-server:name";
                  }
                  description
                    "Specify the outbound interface for DHCPv6 packets.";
                }

                leaf weight {
                  type uint8 {
                    range "0..100";
                  }
                  default "0";
                  description
                    "Specify the load balancing weight for a DHCPv6 server.";
                }
              }  // list interface
            }  // container interfaces
          }  // container bind-servers

          container server-source {
            description
              "Configure the source address for packets to be sent to the DHCPv6 server group.";
            choice source-address {
              description
                "Configure the source address for packets to be sent to the DHCPv6 server group.";
              case link-address {
                description
                  "Configures the source address, which is a link address of the prefix pool bound to a remote address pool.";
                leaf link-address {
                  type empty;
                  description
                    "Indicate that the source address is a link address of the prefix pool bound to a remote address pool.";
                }
              }  // case link-address

              case if-name {
                description
                  "Configures the type and number of the interface whose address is the source address.";
                leaf if-name {
                  type leafref {
                    path "/ifm:ifm/ifm:interfaces/ifm:interface/ifm:name";
                  }
                  must
                    "/ifm:ifm/ifm:interfaces/ifm:interface[ifm:name=current()]/ifm:type='GigabitEthernet' or
/ifm:ifm/ifm:interfaces/ifm:interface[ifm:name=current()]/ifm:type='10GE' or
/ifm:ifm/ifm:interfaces/ifm:interface[ifm:name=current()]/ifm:type='XGigabitEthernet' or
/ifm:ifm/ifm:interfaces/ifm:interface[ifm:name=current()]/ifm:type='100GE' or
/ifm:ifm/ifm:interfaces/ifm:interface[ifm:name=current()]/ifm:type='400GE' or
/ifm:ifm/ifm:interfaces/ifm:interface[ifm:name=current()]/ifm:type='Virtual-Ethernet' or
/ifm:ifm/ifm:interfaces/ifm:interface[ifm:name=current()]/ifm:type='50GE' or
/ifm:ifm/ifm:interfaces/ifm:interface[ifm:name=current()]/ifm:type='50|100GE' or
/ifm:ifm/ifm:interfaces/ifm:interface[ifm:name=current()]/ifm:type='FlexE' or
/ifm:ifm/ifm:interfaces/ifm:interface[ifm:name=current()]/ifm:type='25GE' or
/ifm:ifm/ifm:interfaces/ifm:interface[ifm:name=current()]/ifm:type='Ethernet' or
/ifm:ifm/ifm:interfaces/ifm:interface[ifm:name=current()]/ifm:type='Eth-Trunk' or
/ifm:ifm/ifm:interfaces/ifm:interface[ifm:name=current()]/ifm:type='LoopBack'";
                  description
                    "Indicate the type and number of the interface whose address is the source address.";
                }
              }  // case if-name
            }  // choice source-address
          }  // container server-source

          container server-algorithm {
            description
              "Configure the algorithm for selecting DHCPv6 servers.";
            leaf type {
              type dhcpv6-server-algorithm-type;
              default "master-backup";
              description
                "Specify the algorithm type.";
            }

            leaf check-loose {
              when "../type='polling'";
              type boolean;
              default "false";
              description
                "Enable/disable the loose check function.";
            }
          }  // container server-algorithm

          container retransmit {
            description
              "Configure the device to transparently transmit retransmitted messages from users to the DHCPv6 server.";
            leaf solicit {
              type boolean;
              default "false";
              description
                "Enable/disable a BRAS to transparently transmit retransmitted Solicit messages from users to a DHCPv6 server while waiting for Advertise messages from the DHCPv6 server.";
            }

            leaf request {
              type boolean;
              default "false";
              description
                "Enable/disable a BRAS to transparently transmit retransmitted Request messages from users to a DHCPv6 server while waiting for Reply messages from the DHCPv6 server.";
            }
          }  // container retransmit

          container release-agent {
            description
              "Configure the function of sending DHCPv6 release packets.";
            leaf enable {
              type boolean;
              default "true";
              description
                "Enable/disable the function of sending DHCPv6 release packets.";
            }
          }  // container release-agent
        }  // list dhcpv6-server-group
      }  // container dhcpv6-server-groups

      container server-global-property {
        description
          "Configure a status (Up/Down) switchover for global DHCPv6 server.";
        uses dhcpv6-server-property;
      }  // container server-global-property
    }  // container bras-dhcpv6-server
  }  // module huawei-bras-dhcpv6-server