module ietf-rift {

    yang-version 1.1;

    namespace
      "urn:ietf:params:xml:ns:yang:ietf-rift";

    prefix rift;

    import ietf-inet-types {
      prefix inet;
      reference
        "RFC 6991: Common YANG Data Types";


    }
    import ietf-yang-types {
      prefix yang;
      reference
        "RFC 6991: Common YANG Data Types";


    }
    import ietf-routing {
      prefix rt;
      reference
        "RFC 8349: A YANG Data Model for Routing Management
        (NMDA Version)";


    }
    import ietf-interfaces {
      prefix if;
      reference
        "RFC 8343: A YANG Data Model for Interface Management";


    }
    import ietf-routing-types {
      prefix rt-types;
      reference
        "RFC 8294: Common YANG Data Types for the Routing Area";


    }
    import iana-routing-types {
      prefix iana-rt-types;
      reference
        "RFC 8294: Common YANG Data Types for the Routing Area";


    }
    import ietf-key-chain {
      prefix key-chain;
      reference
        "RFC 8177: YANG Data Model for Key Chains";


    }

    organization
      "IETF RIFT (Routing In Fat Trees) Working Group";

    contact
      "WG Web:   <https://datatracker.ietf.org/wg/rift/>
     WG List:  <mailto:rift@ietf.org>

     Author:   Zheng (Sandy) Zhang
               <mailto:zhang.zheng@zte.com.cn>

     Author:   Yuehua Wei
               <mailto:wei.yuehua@zte.com.cn>

     Author:   Shaowen Ma
               <mailto:mashaowen@gmail.com>

     Author:   Xufeng Liu
               <mailto:xufeng.liu.ietf@gmail.com>

     Author:   Bruno Rijsman
               <mailto:brunorijsman@gmail.com>";

    description
      "This YANG module defines the generic configuration and
     operational state for the RIFT protocol common to all
     vendor implementations.  It is intended that the module
     will be extended by vendors to define vendor-specific
     RIFT configuration parameters and policies --
     for example, route maps or route policies.

     Copyright (c) 2025 IETF Trust and the persons identified as
     authors of the code.  All rights reserved.

     Redistribution and use in source and binary forms, with or
     without modification, is permitted pursuant to, and subject to
     the license terms contained in, the Revised BSD License set
     forth in Section 4.c of the IETF Trust's Legal Provisions
     Relating to IETF Documents
     (https://trustee.ietf.org/license-info).

     This version of this YANG module is part of RFC 9719
     (https://www.rfc-editor.org/info/rfc9719); see the RFC itself
     for full legal notices.

     The key words 'MUST', 'MUST NOT', 'REQUIRED', 'SHALL', 'SHALL
     NOT', 'SHOULD', 'SHOULD NOT', 'RECOMMENDED', 'NOT RECOMMENDED',
     'MAY', and 'OPTIONAL' in this document are to be interpreted as
     described in BCP 14 (RFC 2119) (RFC 8174) when, and only when,
     they appear in all capitals, as shown here.";

    revision "2025-04-04" {
      description "Initial revision.";
      reference
        "RFC 9719: YANG Data Model for Routing in Fat Trees
        (RIFT).";

    }


    feature nonce-delta-adjust {
      description
        "Support weak nonce delta adjusting that is used in
       security.";
      reference
        "RFC 9692: RIFT: Routing in Fat Trees.
        Section 6.9.";

    }

    feature label-switching {
      description
        "Support label switching for instance distinguishing.";
      reference
        "RFC 9692: RIFT: Routing in Fat Trees.
        Section 6.8.8";

    }

    feature tie-security {
      description
        "Support security function for the TIE exchange.";
      reference
        "RFC 9692: RIFT: Routing in Fat Trees.
        Section 6.9.3.";

    }

    feature link-security {
      description
        "Support security function of link.";
      reference
        "RFC 9692: RIFT: Routing in Fat Trees.
        Section 6.9.";

    }

    typedef system-id {
      type string {
        pattern
          '[0-9A-Fa-f]{4}\.[0-9A-Fa-f]{4}\.[0-9A-Fa-f]{4}\.[0-9A-Fa-f]{4}';
      }
      description
        "This type defines the pattern for RIFT System IDs.
       An example of a System ID is 0021.2FFF.FEB5.6E10.";
    }

    typedef level {
      type uint8 {
        range "0 .. 24";
      }
      default "0";
      description
        "The value of node level.
       Clos and Fat Tree networks are topologically partially
       ordered graphs and 'level' denotes the set of nodes at
       the same height in such a network.
       Nodes at the top level (i.e., ToF) are at the level with
       the highest value and count down to the nodes
       at the bottom level (i.e., leaf) with the lowest value.
       In RIFT, level 0 always indicates that a node is a leaf,
       but does not have to be level 0.
       Level values can be configured manually or automatically
       derived.";
      reference
        "RFC 9692: RIFT: Routing in Fat Trees.
        Section 6.7.";

    }

    typedef ieee802-1as-timestamp {
      type uint64;
      units "seconds";
      description
        "Timestamp per IEEE802.1AS. It is advertised with prefix
       to achieve mobility.";
      reference
        "RFC 9692: RIFT: Routing in Fat Trees. Section 6.8.4.
        IEEE8021AS: Timing and Synchronization for Time-Sensitive
        	    Applications in Bridged Local Area Networks";

    }

    identity rift {
      base rt:routing-protocol;
      description
        "Identity for the RIFT routing protocol.";
      reference
        "RFC 9692: RIFT: Routing in Fat Trees";

    }

    grouping address-families {
      description
        "Containing address families on the interface.";
      leaf-list address-families {
        type iana-rt-types:address-family;
        description
          "Indication which address families are up on the
         interface.";
      }
    }  // grouping address-families

    grouping hierarchy-indications {
      description
        "Flags indicating node configuration in case of ZTP.";
      leaf hierarchy-indications {
        type enumeration {
          enum "leaf-only" {
            value 0;
            description
              "The node will never leave the
             'bottom of the hierarchy'.
             When this value is set, the 'configured-level'
             is the minimum level value.";
          }
          enum
            "leaf-only-and-leaf-2-leaf-procedures" {
            value 1;
            description
              "This means leaf to leaf.
             When this value is set, the 'configured-level'
             is the minimum level value.";
          }
          enum "top-of-fabric" {
            value 2;
            description
              "The node is 'top of fabric'.
             When this value is set, the 'configured-level'
             is the maximum level value.";
          }
        }
        description
          "The hierarchy indications of this node.";
      }
    }  // grouping hierarchy-indications

    grouping node-capability {
      description
        "The supported capabilities of this node.";
      leaf proto-minor-ver {
        type uint16;
        description
          "Represents the minor protocol encoding schema
         version of this node.";
      }

      leaf flood-reduction {
        type boolean;
        description
          "If the value is set to 'true', it means that
         this node enables the flood reduction function.";
      }

      container hierarchy-indications {
        config false;
        description
          "The hierarchy-indications of the node.";
        uses hierarchy-indications;
      }  // container hierarchy-indications
    }  // grouping node-capability

    grouping tie-type {
      description "The types of TIE.";
      leaf tie-type {
        type enumeration {
          enum "illegal" {
            value 0;
            description "The illegal TIE.";
          }
          enum "min-tie-type" {
            value 1;
            description "The minimum TIE.";
          }
          enum "node" {
            value 2;
            description "The node TIE.";
          }
          enum "prefix" {
            value 3;
            description "The prefix TIE.";
          }
          enum
            "positive-disaggregation-prefix" {
            value 4;
            description
              "The positive disaggregation prefix TIE.";
          }
          enum
            "negative-disaggregation-prefix" {
            value 5;
            description
              "The negative disaggregation prefix TIE.";
          }
          enum "pgp-prefix" {
            value 6;
            description
              "The policy guide prefix TIE.";
          }
          enum "key-value" {
            value 7;
            description "The key value TIE.";
          }
          enum "external-prefix" {
            value 8;
            description
              "The external prefix TIE.";
          }
          enum
            "positive-external-disaggregation-prefix" {
            value 9;
            description
              "The positive external disaggregation prefix TIE.";
          }
          enum "max-tie-type" {
            value 10;
            description "The maximum TIE.";
          }
        }
        description "The types of TIE.";
      }
    }  // grouping tie-type

    grouping prefix-attribute {
      description
        "The attributes of the prefix.";
      leaf metric {
        type uint32;
        description
          "The metric of this prefix.";
      }

      leaf-list tags {
        type uint64;
        description
          "The tags of this prefix.";
      }

      container monotonic-clock {
        description
          "The monotonic clock for mobile addresses.";
        container prefix-sequence-type {
          description
            "The prefix sequence attribute that can be advertised
           for mobility.";
          reference
            "RFC 9692: RIFT: Routing in Fat Trees.
            Section 6.8.4.";

          leaf timestamp {
            type ieee802-1as-timestamp;
            mandatory true;
            description
              "The timestamp per 802.1AS can be advertised
             with the desired prefix North TIEs.";
          }

          leaf transaction-id {
            type uint8;
            description
              "As per RFC 8505, a sequence number called a
             Transaction ID (TID) with a prefix can be
             advertised.";
            reference
              "RFC 8505: Registration Extensions for IPv6 over
              Low-Power Wireless Personal Area Network (6LoWPAN)
              Neighbor Discovery";

          }
        }  // container prefix-sequence-type
      }  // container monotonic-clock

      leaf loopback {
        type boolean;
        description
          "If the value is set to 'true', it
         indicates if the interface is a node loopback.
         The node's loopback address can be injected into
         Prefix North and Prefix South TIEs for node reachability.";
        reference
          "RFC 9692: RIFT: Routing in Fat Trees.
          Section 6.4.";

      }

      leaf directly-attached {
        type boolean;
        description
          "If the value is set to 'true', it indicates that the
         prefix is directly attached, i.e., should be routed to
         even if the node is in overload.";
      }

      leaf from-link {
        type uint32;
        description
          "In case of locally originated prefixes,
         i.e., interface addresses this can describe which
         link the address belongs to.";
      }

      leaf label {
        type uint32;
        description
          "Per prefix significant label.";
        reference
          "RFC 9692: RIFT: Routing in Fat Trees";

      }
    }  // grouping prefix-attribute

    grouping security {
      description "The security parameters.";
      leaf security-type {
        type enumeration {
          enum "public" {
            value 0;
            description
              "When using Public Key Infrastructure (PKI),
             the public and shared key can be used to verify
             the original packet exchanged with the neighbor.";
          }
          enum "private" {
            value 1;
            description
              "When using Public Key Infrastructure (PKI),
             the private key can be used by the Security
             fingerprint originating node to create the signature.";
          }
        }
        description "The security type.";
        reference
          "RFC 9692: RIFT: Routing in Fat Trees.
          Section 6.9.";

      }

      leaf shared {
        type boolean;
        description
          "When using Public Key Infrastructure (PKI),
         if the key is shared.";
        reference
          "RFC 9692: RIFT: Routing in Fat Trees.
          Section 6.9.";

      }

      choice auth-key-chain {
        description
          "Key chain or explicit key parameter specification.";
        leaf key-chain {
          type key-chain:key-chain-ref;
          description "key-chain name.";
          reference
            "RFC 8177: YANG Data Model for Key Chains";

        }

        case auth-key-explicit {
          leaf key {
            type string;
            description
              "Authentication key. The length of the key may be
             dependent on the cryptographic algorithm.";
          }

          leaf crypto-algorithm {
            type identityref {
              base key-chain:crypto-algorithm;
            }
            description
              "Cryptographic algorithm associated with key.";
            reference
              "RFC 8177: YANG Data Model for Key Chains";

          }
        }  // case auth-key-explicit
      }  // choice auth-key-chain
    }  // grouping security

    grouping base-node-info {
      description
        "The base information of a node.";
      leaf node-level {
        type level;
        config false;
        description
          "The level of this node.";
      }

      leaf system-id {
        type system-id;
        mandatory true;
        description
          "Each node is identified via a system-id that is 64
         bits wide.";
      }

      leaf fabric-id {
        type uint16;
        description
          "The optional id of the fabric.";
      }

      leaf pod {
        type uint32 {
          range "1..max";
        }
        description
          "The identifier of the Point of Delivery (PoD).
         A PoD is the self-contained vertical slice of a
         Clos or Fat Tree network containing normally only leaf
         nodes (level 0) and their immediate northbound
         neighbors. It communicates with nodes
         in other PoDs via the spine. Making this leaf
         unspecified indicates that the PoD is 'undefined'.";
      }
    }  // grouping base-node-info

    grouping link-capabilities {
      description
        "The features of neighbor.";
      leaf bfd-capable {
        type boolean;
        default "true";
        description
          "If this value is set to 'true', it means that
         BFD function is enabled on the neighbor.";
        reference
          "RFC 5881: Bidirectional Forwarding Detection (BFD)
          for IPv4 and IPv6 (Single Hop)";

      }

      leaf v4-forwarding-capable {
        type boolean;
        default "true";
        description
          "If this value is set to 'true', it means that
         the neighbor supports v4 forwarding.";
      }

      leaf mtu-size {
        type uint32;
        default "1400";
        description "MTU of the link.";
      }
    }  // grouping link-capabilities

    grouping addresses {
      description
        "IPv4 and/or IPv6 address to be used.";
      leaf ipv4 {
        type inet:ipv4-address-no-zone;
        description
          "IPv4 address to be used.";
      }

      leaf ipv6 {
        type inet:ipv6-address-no-zone;
        description
          "IPv6 address to be used.";
      }
    }  // grouping addresses

    grouping lie-elements {
      description
        "The elements set in the LIEs.";
      leaf label {
        if-feature label-switching;
        type uint32;
        description
          "A locally significant, downstream assigned by
         the neighbor, interface-specific label that may
         be advertised in its LIEs.";
        reference
          "RFC 9692: RIFT: Routing in Fat Trees.
          Section 6.8.8.";

      }

      leaf you-are-flood-repeater {
        type boolean;
        description
          "If the neighbor on this link is flooding repeater.
         When this value is set to 'true', the value can be
         carried in exchanged packet.";
        reference
          "RFC 9692: RIFT: Routing in Fat Trees.
          Section 6.3.9.";

      }

      leaf not-a-ztp-offer {
        type boolean;
        description
          "When this value is set to 'true', the flag can be
         carried in the LIE packet. When the value received
         in the LIE from neighbor, it indicates the level on
         the LIE MUST NOT be used to derive a ZTP level by
         the receiving node.";
        reference
          "RFC 9692: RIFT: Routing in Fat Trees.
          Section 6.7.";

      }

      leaf you-are-sending-too-quickly {
        type boolean;
        description
          "Can be optionally set to indicate to neighbor that
         packet losses are seen on reception based on packet
         numbers or the rate is too high. The receiver SHOULD
         temporarily slow down flooding rates. When this value
         is set to 'true', the flag can be carried in packet.";
      }
    }  // grouping lie-elements

    grouping link-id-pair {
      description
        "A pair of local and remote link-id to identify a link
       between two nodes.";
      leaf local-id {
        type uint32;
        description
          "The local-id of link connect to this neighbor.";
      }

      leaf remote-id {
        type uint32;
        description
          "The remote-id to reach this neighbor.";
      }

      leaf if-index {
        type uint32;
        description
          "The local index of this interface.";
      }

      leaf if-name {
        type if:interface-ref;
        description
          "The name of this interface.";
      }

      uses address-families;
    }  // grouping link-id-pair

    grouping neighbor-node {
      description
        "The neighbor information indicated in node TIE.";
      list link-id-pair {
        key "remote-id";
        description
          "The multiple parallel links to this neighbor.";
        uses link-id-pair;
      }  // list link-id-pair

      leaf cost {
        type uint32;
        description
          "The cost value advertised by the neighbor.";
      }

      leaf bandwidth {
        type uint32;
        units "bits";
        description
          "Total bandwidth to the neighbor, this will be
         normally sum of the bandwidths of all the
         parallel links.";
      }

      container received-link-capabilities {
        description
          "The link capabilities advertised by the neighbor.";
        uses link-capabilities;
      }  // container received-link-capabilities
    }  // grouping neighbor-node

    grouping neighbor {
      description
        "The neighbor information.";
      leaf proto-major-ver {
        type uint8;
        description
          "Represents protocol encoding schema major version of
         this neighbor.";
      }

      leaf proto-minor-ver {
        type uint16;
        description
          "Represents protocol encoding schema minor version of
         this neighbor.";
      }

      container sent-offer {
        description
          "The level sent to the neighbor in case the neighbor
         needs to be offered.";
        leaf level {
          type level;
          description "The level value.";
        }

        leaf not-a-ztp-offer {
          type boolean;
          description
            "If the value is set to 'true', it indicates the
           level on the LIE MUST NOT be used to derive a
           ZTP level by the neighbor.";
        }
      }  // container sent-offer

      container received-offer {
        description
          "The level offered to the interface from the neighbor.
         And if the level value is considered to be used.";
        leaf level {
          type level;
          description "The level value.";
        }

        leaf not-a-ztp-offer {
          type boolean;
          description
            "If the value is set to 'true', it indicates the
           level on the received LIE MUST NOT be used to
           derive a ZTP level.";
        }

        leaf best {
          type boolean;
          description
            "If the value is set to 'true', it means that
           the level is the best level received from all
           the neighbors.";
        }

        leaf removed-from-consideration {
          type boolean;
          description
            "If the value is set to 'true', it means that
           the level value is not considered to be used.";
        }

        leaf removal-reason {
          when
            "../removed-from-consideration='true'" {
            description
              "The level value is not considered to be used.";
          }
          type string;
          description
            "The reason why this value is not considered to
           be used.";
        }
      }  // container received-offer

      container received-source-addr {
        description
          "The source address of LIE and TIE packets from
         the neighbor.";
        uses addresses;
      }  // container received-source-addr

      uses neighbor-node;

      container received-in-lies {
        description
          "The attributes received from this neighbor.";
        uses lie-elements;
      }  // container received-in-lies

      leaf nbr-flood-port {
        type inet:port-number;
        default "915";
        description
          "The UDP port which is used by the neighbor to flood
         TIEs.";
      }

      leaf tx-flood-port {
        type inet:port-number;
        default "915";
        description
          "The UDP port which is used by the node to flood
         TIEs to the neighbor.";
      }

      leaf bfd-state {
        type enumeration {
          enum "up" {
            value 0;
            description
              "The link is protected by established BFD session.";
          }
          enum "down" {
            value 1;
            description
              "The link is not protected by established BFD session.";
          }
        }
        description
          "The link is protected by established BFD session or not.";
      }

      leaf outer-security-key-id {
        type uint8;
        description
          "The received security key id from the neighbor.";
        reference
          "RFC 9692: RIFT: Routing in Fat Trees.
          Section 6.9.3.";

      }
    }  // grouping neighbor

    grouping link-direction-type {
      description "The type of link.";
      leaf link-direction-type {
        type enumeration {
          enum "illegal" {
            value 0;
            description "Illegal direction.";
          }
          enum "south" {
            value 1;
            description
              "A link to a node one level down.";
          }
          enum "north" {
            value 2;
            description
              "A link to a node one level up.";
          }
          enum "east-west" {
            value 3;
            description
              "A link to a node in the same level.";
          }
          enum "max" {
            value 4;
            description
              "The max value of direction.";
          }
        }
        config false;
        description "The type of link.";
      }
    }  // grouping link-direction-type

    grouping tie-direction-type {
      description
        "The direction type of TIE.";
      leaf tie-direction-type {
        type enumeration {
          enum "illegal" {
            value 0;
            description "Illegal direction.";
          }
          enum "south" {
            value 1;
            description
              "The direction to a node one level down.";
          }
          enum "north" {
            value 2;
            description
              "The direction to a node one level up.";
          }
          enum "max" {
            value 3;
            description
              "The max value of direction.";
          }
        }
        config false;
        description
          "The direction type of TIE.";
      }
    }  // grouping tie-direction-type

    grouping spf-direction-type {
      description
        "The direction type of SPF calculation.";
      leaf spf-direction-type {
        type enumeration {
          enum "n-spf" {
            value 0;
            description
              "A reachability calculation that is progressing
             northbound, as example SPF that is using South
             Node TIEs only. Normally it progresses a single
             hop only and installs default routes.";
          }
          enum "s-spf" {
            value 1;
            description
              "A reachability calculation that is progressing
             southbound, as example SPF that is using North
             Node TIEs only.";
          }
        }
        config false;
        description
          "The direction type of SPF calculation.";
      }
    }  // grouping spf-direction-type

    grouping tie-header {
      description
        "TIEs are exchanged between RIFT nodes to describe parts
       of a network such as links and address prefixes.
       This is the TIE header information.";
      uses tie-direction-type;

      leaf originator {
        type system-id;
        description
          "The originator's system-id of this TIE.";
      }

      uses tie-type;

      leaf tie-number {
        type uint32;
        description
          "The number of this TIE.";
      }

      leaf seq {
        type uint64;
        description
          "The sequence number of a TIE.";
        reference
          "RFC 9692: RIFT: Routing in Fat Trees.
          Section 6.3.1.";

      }

      leaf size {
        type uint32;
        description "The size of this TIE.";
      }

      leaf origination-time {
        type ieee802-1as-timestamp;
        description
          "Absolute timestamp when the TIE was generated.
         This can be used on fabrics with synchronized
         clock to prevent lifetime modification attacks.";
      }

      leaf origination-lifetime {
        type uint32;
        units "seconds";
        description
          "Original lifetime when the TIE was generated.
         This can be used on fabrics with synchronized clock
         to prevent lifetime modification attacks.";
      }

      leaf remaining-lifetime {
        type uint32;
        units "seconds";
        description
          "The remaining lifetime of the TIE.";
      }
    }  // grouping tie-header

    augment /rt:routing/rt:control-plane-protocols/rt:control-plane-protocol {
      when
        "derived-from-or-self(rt:type, 'rift:rift')" {
        description
          "This augment is only valid when routing protocol
         instance type is 'RIFT'.";
      }
      description
        "RIFT ( Routing in Fat Trees ) YANG model.";
      list rift {
        key "name";
        description
          "RIFT configuration and state data.";
        leaf name {
          type string;
          description
            "The RIFT instance's name.";
        }

        container global {
          description
            "The global configuration and status of
           this RIFT protocol instance.";
          uses base-node-info;

          leaf fabric-prefix {
            type inet:ip-prefix;
            description
              "The configured fabric prefix.";
          }

          leaf fabric-prefix-advertise {
            type boolean;
            description
              "Whether the fabric-prefix can be advertised or not.
             If the value is set to 'true', it means that
             the fabric-prefix can be advertised to neighbors.";
          }

          leaf configured-level {
            type level;
            description
              "The configured level value of this node.";
          }

          container overload {
            description
              "If the overload in TIEs can be set
             and the timeout value with according type.";
            leaf overload {
              type boolean;
              description
                "If the value is set to 'true', it means that
               the overload bit in TIEs can be set.";
            }

            choice timeout-type {
              description
                "The value of timeout timer for overloading.
               This makes sense when overload is set to 'TRUE'.";
              leaf on-startup-timeout {
                type rt-types:timer-value-seconds16;
                description
                  "Node goes into overload until this timer
                   expires when starting up.";
              }
              leaf immediate-timeout {
                type rt-types:timer-value-seconds16;
                description
                  "Set overload and remove after the timeout
                   expired.";
              }
            }  // choice timeout-type
          }  // container overload

          leaf proto-major-ver {
            type uint8;
            config false;
            mandatory true;
            description
              "Represents protocol encoding schema major version.";
          }

          leaf proto-minor-ver {
            type uint16;
            config false;
            mandatory true;
            description
              "Represents protocol encoding schema minor version.";
          }

          container node-capabilities {
            description
              "The node's capabilities.";
            uses hierarchy-indications;

            leaf flood-reduction {
              type boolean;
              description
                "If the node supports flood reduction function.
               If this value is set to 'true',  it means that
               the flood reduction function is enabled.";
              reference
                "RFC 9692: RIFT: Routing in Fat Trees.
                Section 6.3.8.";

            }
          }  // container node-capabilities

          leaf maximum-nonce-delta {
            if-feature nonce-delta-adjust;
            type uint8 {
              range "1..5";
            }
            description
              "The configurable valid nonce delta value used for
             security. It is used as vulnerability window.
             If the nonces in received packet exceeds the range
             indicated by this value, the packet MUST be
             discarded.";
            reference
              "RFC 9692: RIFT: Routing in Fat Trees.
              Section 6.9.4.";

          }

          leaf nonce-increasing-interval {
            type uint16;
            units "seconds";
            description
              "The configurable nonce increasing interval.";
          }

          leaf adjusted-lifetime {
            type rt-types:timer-value-seconds16;
            units "seconds";
            description
              "The adjusted lifetime may affect the TIE stability.
             Be careful to change this parameter.
             This SHOULD be prohibited less than 2*purge-lifetime.";
          }

          container rx-lie-multicast-addr {
            description
              "The configurable LIE receiving IPv4/IPv6 multicast
             address.
             Different multicast addresses can be used for
             receiving and sending.";
            leaf ipv4 {
              type inet:ipv4-address;
              default "224.0.0.121";
              description
                "The configurable LIE receiving IPv4 multicast
               address.
               Different multicast addresses can be used for
               receiving and sending.";
            }

            leaf ipv6 {
              type inet:ipv6-address;
              default "ff02::a1f7";
              description
                "The configurable LIE receiving IPv6 multicast
               address.
               Different multicast addresses can be used for
               receiving and sending.";
            }
          }  // container rx-lie-multicast-addr

          container tx-lie-multicast-addr {
            description
              "The configurable LIE sending IPv4/IPv6 multicast
             address.
             Different multicast addresses can be used for
             receiving and sending.";
            leaf ipv4 {
              type inet:ipv4-address;
              description
                "The configurable LIE sending IPv4 multicast
               address.
               Different multicast addresses can be used for
               receiving and sending.";
            }

            leaf ipv6 {
              type inet:ipv6-address;
              description
                "The configurable LIE sending IPv6 multicast
               address.
               Different multicast addresses can be used for
               receiving and sending.";
            }
          }  // container tx-lie-multicast-addr

          leaf lie-tx-port {
            type inet:port-number;
            default "914";
            description
              "The UDP port of LIE packet sending. The default port
             number is 914. The value can be set to other value
             associated with different RIFT instance.";
          }

          container global-link-capabilities {
            description
              "The node default link capabilities. It can be
             overwritten by the configuration underneath interface
             and neighbor.";
            uses link-capabilities;
          }  // container global-link-capabilities

          leaf tide-generation-interval {
            type rt-types:timer-value-seconds16;
            units "seconds";
            description
              "The TIDE generation interval.";
          }

          list tie-security {
            if-feature tie-security;
            key "security-type";
            description
              "The security function used for the TIE exchange.";
            reference
              "RFC 9692: RIFT: Routing in Fat Trees.
              Section 6.9.3.";

            uses security;
          }  // list tie-security

          leaf inner-security-key-id {
            type uint8;
            description
              "The inner security key id for received packet
             checking.";
            reference
              "RFC 9692: RIFT: Routing in Fat Trees.
              Section 6.9.3.";

          }

          leaf algorithm-type {
            type enumeration {
              enum "spf" {
                value 0;
                description
                  "The algorithm is SPF.";
              }
              enum "all-path" {
                value 1;
                description
                  "The algorithm is all-path.";
              }
            }
            description
              "The possible algorithm types.";
          }

          container hal {
            config false;
            description
              "The highest defined level and the offered nodes set.";
            leaf hal-value {
              type level;
              description
                "The highest defined level value seen from all
               valid level offers received.";
            }

            leaf-list system-ids {
              type system-id;
              description
                "The node's system-id of the offered level comes
               from.";
            }
          }  // container hal

          leaf-list miscabled-links {
            type uint32;
            config false;
            description
              "List of miscabled links.";
          }

          leaf hop-limit {
            type uint8 {
              range "1 | 255";
            }
            default "1";
            description
              "The IPv4 TTL or IPv6 HL used for LIE and TIE
             sending/receiving.";
          }

          leaf maximum-clock-delta {
            type ieee802-1as-timestamp;
            description
              "The maximum drift for the timestamp comparing.";
            reference
              "RFC 9692: RIFT: Routing in Fat Trees.
              Section 6.8.4.";

          }
        }  // container global

        list interfaces {
          key "name";
          description
            "The interface information on this node.";
          leaf link-id {
            type uint32;
            config false;
            description
              "The local id of this interface.";
          }

          leaf name {
            type if:interface-ref;
            description
              "The interface's name.";
          }

          leaf cost {
            type uint32;
            description
              "The cost from this interface to the neighbor.";
          }

          leaf rx-flood-port {
            type inet:port-number;
            default "915";
            description
              "The UDP port which is used to receive flooded
             TIEs. The default port number is 915. The value
             can be set to other value associated with different
             RIFT instance.";
          }

          leaf holdtime {
            type rt-types:timer-value-seconds16;
            units "seconds";
            default "3";
            description
              "The holding time of LIE.";
          }

          uses address-families;

          container advertised-source-addr {
            description
              "The address used in the advertised LIE and TIE
             packets.";
            uses addresses;
          }  // container advertised-source-addr

          uses link-direction-type;

          leaf broadcast-capable {
            type boolean;
            description
              "If LIE can be received by broadcast address.";
            reference
              "RFC 9692: RIFT: Routing in Fat Trees.
              Section 6.2.";

          }

          leaf allow-horizontal-link {
            type boolean;
            description
              "If horizontal link adjacency is allowed.";
          }

          container security {
            if-feature link-security;
            description
              "The security function used for this interface.";
            reference
              "RFC 9692: RIFT: Routing in Fat Trees.
              Section 6.9.3.";

            uses security;
          }  // container security

          leaf security-checking {
            type enumeration {
              enum "no-checking" {
                value 0;
                description
                  "The security envelope does not be checked.";
              }
              enum "permissive" {
                value 1;
                description
                  "The security envelope checking is permissive.";
              }
              enum "loose" {
                value 2;
                description
                  "The security envelope checking is loose.";
              }
              enum "strict" {
                value 3;
                description
                  "The security envelope checking is strict.";
              }
            }
            description
              "The possible security checking types.
             Only one type can be set at the same time.";
          }

          leaf was-the-last-lie-accepted {
            type boolean;
            config false;
            description
              "If the value is set to 'true', it means that
             the most recently received LIE was accepted.
             If the LIE was rejected, the neighbor error
             notifications should be used to find the reason.";
          }

          leaf last-lie-reject-reason {
            type string;
            config false;
            description
              "Description for the reject reason of the last LIE.";
          }

          container advertised-in-lies {
            config false;
            description
              "The attributes advertised in the LIEs from
             this interface.";
            uses lie-elements;
          }  // container advertised-in-lies

          container link-capabilities {
            description
              "The interface's link capabilities.";
            uses link-capabilities;
          }  // container link-capabilities

          leaf state {
            type enumeration {
              enum "one-way" {
                value 0;
                description
                  "The initial state.";
              }
              enum "two-way" {
                value 1;
                description
                  "Valid LIE received but not a ThreeWay LIE.";
              }
              enum "three-way" {
                value 2;
                description
                  "Valid ThreeWay LIE received.";
              }
              enum "multiple-neighbors-wait" {
                value 3;
                description
                  "More than two neighbors found in the same link.";
              }
            }
            config false;
            mandatory true;
            description
              "The states of LIE finite state machine.";
            reference
              "RFC 9692: RIFT: Routing in Fat Trees.
              Section 6.2.1.";

          }

          list neighbors {
            key "system-id";
            config false;
            description
              "The neighbor's information.";
            uses base-node-info;

            uses neighbor;

            leaf local-nonce {
              type uint16;
              description
                "The exchanged local nonce with this neighbor.";
            }

            leaf remote-nonce {
              type uint16;
              description
                "The exchanged remote nonce to this neighbor.";
            }

            action clear-neighbor {
              description
                "Clears the connection to the neighbor.";
            }  // rpc clear-neighbor
          }  // list neighbors

          action clear-all-neighbors {
            description
              "Clears all the connections to the neighbors
             on this interface.";
          }  // rpc clear-all-neighbors
        }  // list interfaces

        container statistics {
          config false;
          description
            "The statistics collection.";
          container global {
            description
              "The global routes number.";
            leaf total-num-routes-north {
              type yang:zero-based-counter32;
              config false;
              description
                "The total number of north routes.";
            }

            leaf total-num-routes-south {
              type yang:zero-based-counter32;
              config false;
              description
                "The total number of south routes.";
            }
          }  // container global

          list spf-statistics {
            key "spf-direction-type";
            description
              "The statistics of SPF calculation.";
            uses spf-direction-type;

            leaf start-time {
              type yang:date-and-time;
              description
                "The last SPF calculation start time.";
            }

            leaf end-time {
              type yang:date-and-time;
              description
                "The last SPF calculation end time.";
            }

            container triggering-tie {
              description
                "The TIE that triggered the SPF.";
              uses tie-header;
            }  // container triggering-tie

            action clear-spf-statistics {
              description
                "Clears the statistics of this type of
               SPF calculation.";
            }  // rpc clear-spf-statistics
          }  // list spf-statistics

          list interfaces {
            key "name";
            description
              "The statistics of interfaces.";
            leaf name {
              type if:interface-ref;
              description
                "The interface's name.";
            }

            container intf-states-statistics {
              description
                "The states and statistics of this interface.";
              leaf intf-states-startup-time {
                type uint64;
                description
                  "The states and statistics record startup time
                 of the interface.";
              }

              leaf num-of-nbrs-3way {
                type yang:zero-based-counter32;
                description
                  "The number of neighbors which state is in
                 ThreeWay.";
              }

              leaf num-of-nbrs-down {
                type yang:zero-based-counter32;
                description
                  "The number of neighbors which state
                 changed to down.";
              }

              list nbrs-down-reasons {
                key "system-id";
                description
                  "The down neighbors and reasons.";
                leaf system-id {
                  type system-id;
                  description
                    "The system-id of neighbor.";
                }

                leaf last-down-reason {
                  type string;
                  description
                    "The last down reason of the neighbor.";
                }
              }  // list nbrs-down-reasons

              leaf num-local-level-change {
                type yang:zero-based-counter32;
                description
                  "The number of local level changes.";
              }

              leaf number-of-flaps {
                type yang:zero-based-counter32;
                config false;
                description
                  "The number of interface state flaps.";
              }

              leaf last-state-change {
                type yang:date-and-time;
                config false;
                description
                  "Time duration in the current state.";
              }

              leaf last-up {
                type yang:date-and-time;
                config false;
                description
                  "The last time of up.";
              }

              leaf last-down {
                type yang:date-and-time;
                config false;
                description
                  "The last time of down.";
              }

              container intf-lie-states {
                description
                  "The LIE's statistics of this interface.";
                leaf last-lie-sent-time {
                  type uint64;
                  description
                    "The time of the last LIE sent.";
                }

                leaf last-lie-received-time {
                  type uint64;
                  description
                    "The time of the last LIE received.";
                }

                leaf num-lie-received {
                  type yang:zero-based-counter32;
                  description
                    "The number of received LIEs.";
                }

                leaf num-lie-transmitted {
                  type yang:zero-based-counter32;
                  description
                    "The number of transmitted LIEs.";
                }

                leaf num-lie-drop-invalid-envelope {
                  type yang:zero-based-counter32;
                  description
                    "The number of dropped LIEs due to
                   invalid outer envelope.";
                }

                leaf num-lie-drop-invalid-nonce {
                  type yang:zero-based-counter32;
                  description
                    "The number of dropped LIEs due to
                   invalid nonce.";
                }

                leaf num-lie-corrupted {
                  type yang:zero-based-counter32;
                  description
                    "The number of corrupted LIEs received.";
                }
              }  // container intf-lie-states
            }  // container intf-states-statistics

            container flood-repeater-statistics {
              description
                "The flood repeater statistics.";
              leaf flood-repeater {
                type system-id;
                description
                  "The system-id of the current flood repeater.
                 If this leaf has no value, that means the neighbor
                 is not flood repeater.";
              }

              leaf num-flood-repeater-changes {
                type yang:zero-based-counter32;
                description
                  "The number of flood repeater changes.";
              }

              leaf last-flood-repeater-change-reason {
                type string;
                description
                  "The reason of the last flood repeater change.";
              }
            }  // container flood-repeater-statistics

            action clear-intf-statistics {
              description
                "Clears the statistics of this interface.";
            }  // rpc clear-intf-statistics
          }  // list interfaces

          list neighbors {
            key "system-id";
            description
              "The statistics of neighbors.";
            leaf system-id {
              type system-id;
              description
                "The system-id of the neighbor.";
            }

            container tie-state-statistics {
              description
                "The statistics of TIE, TIDE, TIRE
               exchanging with this neighbor.";
              leaf transmit-queue {
                type yang:zero-based-counter32;
                description
                  "The length of TIE transmit queue.";
              }

              container last-queued-tie {
                description
                  "The last queued TIE for transmit.";
                uses tie-header;

                leaf reason-queued {
                  type string;
                  description
                    "The queued reason of the last queued TIE.";
                }
              }  // container last-queued-tie

              leaf num-received-ties {
                type yang:zero-based-counter32;
                description
                  "The number of TIEs received.";
              }

              leaf num-transmitted-ties {
                type yang:zero-based-counter32;
                description
                  "The number of TIEs transmitted.";
              }

              leaf num-retransmitted-ties {
                type yang:zero-based-counter32;
                description
                  "The number of TIEs retransmitted.";
              }

              leaf num-flood-reduced-ties {
                type yang:zero-based-counter32;
                description
                  "The number of TIEs that were flood reduced.";
              }

              leaf num-received-tides {
                type yang:zero-based-counter32;
                description
                  "The number of TIDEs received.";
              }

              leaf num-transmitted-tides {
                type yang:zero-based-counter32;
                description
                  "The number of TIDEs transmitted.";
              }

              leaf num-received-tires {
                type yang:zero-based-counter32;
                description
                  "The number of TIREs received.";
              }

              leaf num-transmitted-tires {
                type yang:zero-based-counter32;
                description
                  "The number of TIREs transmitted.";
              }

              leaf num-request-locally {
                type yang:zero-based-counter32;
                description
                  "The number of TIEs requested locally.";
              }

              leaf num-request-remotely {
                type yang:zero-based-counter32;
                description
                  "The number of TIEs requested by the neighbor.";
              }

              leaf num-same-older-ties-received {
                type yang:zero-based-counter32;
                description
                  "The number of times of the same or older TIE
                 has been received.";
              }

              leaf num-seq-mismatch-pkts-received {
                type yang:zero-based-counter32;
                description
                  "The number of packets with sequence number
                 mismatches.";
              }

              container last-sent-tie {
                description
                  "The information of the last sent TIE.";
                uses tie-header;

                leaf last-tie-sent-time {
                  type yang:date-and-time;
                  description
                    "The time of the last TIE sent.";
                }
              }  // container last-sent-tie

              container last-recv-tie {
                description
                  "The information of the last received TIE.";
                uses tie-header;

                leaf last-tie-recv-time {
                  type yang:date-and-time;
                  description
                    "The time of the last TIE received.";
                }
              }  // container last-recv-tie

              container largest-tie {
                description
                  "The largest sent TIE, TIDE and TIRE.";
                container largest-tie-sent {
                  description
                    "The largest TIE sent.";
                  uses tie-header;
                }  // container largest-tie-sent

                container largest-tide-sent {
                  description
                    "The largest TIDE sent.";
                  uses tie-header;
                }  // container largest-tide-sent

                container largest-tire-sent {
                  description
                    "The largest TIRE sent.";
                  uses tie-header;
                }  // container largest-tire-sent
              }  // container largest-tie

              container num-tie-dropped {
                description
                  "The total number of TIEs dropped due to
                 security reasons.";
                leaf num-tie-outer-envelope {
                  type yang:zero-based-counter32;
                  description
                    "The total number of TIEs dropped due to
                   invalid outer envelope.";
                }

                leaf num-tie-inner-envelope {
                  type yang:zero-based-counter32;
                  description
                    "The total number of TIEs dropped due to
                   invalid inner envelope.";
                }

                leaf num-tie-nonce {
                  type yang:zero-based-counter32;
                  description
                    "The total number of TIEs dropped due to
                   invalid nonce.";
                }
              }  // container num-tie-dropped
            }  // container tie-state-statistics

            action clear-nbr-statistics {
              description
                "Clears the statistics of this neighbor.";
            }  // rpc clear-nbr-statistics
          }  // list neighbors
        }  // container statistics

        container database {
          config false;
          description
            "The TIEs information in database.";
          list ties {
            key "tie-direction-type originator tie-type tie-number";
            description
              "A list of TIEs (Topology Information Elements).";
            uses tie-header;

            container node {
              description
                "The node element information in this TIE.";
              leaf level {
                type level;
                config false;
                description
                  "The level of this node.";
              }

              list neighbors {
                key "system-id";
                description
                  "The node TIE information of a neighbor.";
                uses base-node-info;

                uses neighbor-node;
              }  // list neighbors

              uses node-capability;

              leaf overload-flag {
                type boolean;
                description
                  "If the value is set to 'true', it means that
                 the overload bit in TIEs is set.";
              }

              leaf name {
                type string;
                description
                  "The name of this node. It won't be used as the
                 key of node, just used for description.";
              }

              leaf pod {
                type uint32;
                description
                  "Point of Delivery. The self-contained vertical
                 slice of a Clos or Fat Tree network containing
                 normally only level 0 and level 1 nodes. It
                 communicates with nodes in other PoDs via the
                 spine. We number PoDs to distinguish them and
                 use PoD #0 to denote 'undefined' PoD.";
              }

              leaf startup-time {
                type uint64;
                description
                  "Startup time of the node.";
              }

              leaf-list miscabled-links {
                type uint32;
                config false;
                description
                  "List of miscabled links.";
              }

              leaf-list same-plane-tofs {
                type system-id;
                config false;
                description
                  "ToFs in the same plane. Only carried by ToF.
                 Multiple Node TIEs can carry disjoint sets of
                 ToFs which MUST be joined to form a single
                 set.";
              }

              leaf fabric-id {
                type uint32;
                config false;
                description
                  "The optional ID of the Fabric configured.";
              }
            }  // container node

            container prefixes {
              description
                "The prefix element information in this TIE.";
              list prefixes {
                key "prefix";
                description
                  "The prefix set information.";
                leaf prefix {
                  type inet:ip-prefix;
                  description
                    "The prefix information.";
                }

                uses tie-type;

                uses prefix-attribute;
              }  // list prefixes
            }  // container prefixes

            container key-value {
              description
                "The information used to distinguish a Key/Value
               pair. When the type of kv is set to 'node',
               node-element is making sense. When the type of
               kv is set to other values except 'node',
               prefix-info is making sense.";
              leaf key {
                type binary;
                description
                  "The type of key value combination.";
              }

              leaf value {
                type binary;
                description
                  "The value of key value combination.";
              }
            }  // container key-value
          }  // list ties
        }  // container database
      }  // list rift
    }

    notification error-set {
      description
        "The errors notification of RIFT.";
      container tie-level-error {
        description
          "The TIE errors notification of RIFT.";
        list rift {
          key "name";
          description "The TIE errors set.";
          leaf name {
            type string;
            description
              "The RIFT instance's name.";
          }

          list ties {
            key "originator";
            description
              "The level is undefined in the LIEs.";
            uses tie-header;
          }  // list ties
        }  // list rift
      }  // container tie-level-error

      container neighbor-error {
        description
          "The neighbor errors notification of RIFT.";
        list rift {
          key "name";
          description "The RIFT instance.";
          leaf name {
            type string;
            description
              "The RIFT instance's name.";
          }

          list interfaces {
            key "name";
            description
              "The interfaces with wrong level neighbor.";
            leaf link-id {
              type uint32;
              description
                "The local id of this interface.";
            }

            leaf name {
              type if:interface-ref;
              description
                "The interface's name.";
            }

            list neighbors {
              key "system-id";
              description
                "The level of the neighbor is wrong.";
              leaf system-id {
                type system-id;
                description
                  "Each node is identified via a system-id which is 64
                 bits wide.";
              }

              leaf node-level {
                type level;
                description
                  "The level of this node.";
              }
            }  // list neighbors
          }  // list interfaces
        }  // list rift
      }  // container neighbor-error
    }  // notification error-set
  }  // module ietf-rift