module ietf-vrrp {

    yang-version 1.1;

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

    prefix vrrp;

    import ietf-inet-types {
      prefix inet;
    }
    import ietf-yang-types {
      prefix yang;
    }
    import ietf-interfaces {
      prefix if;
    }
    import ietf-ip {
      prefix ip;
    }

    organization
      "IETF Routing Area Working Group (RTGWG)";

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

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

     Editor:   Athanasios Kyparlis
               <mailto:Athanasios_Kyparlis@jabil.com>
     Editor:   Ravi Parikh
               <mailto:parikhr@vmware.com>

     Editor:   Acee Lindem
               <mailto:acee@cisco.com>

     Editor:   Mingui Zhang
               <mailto:zhangmingui@huawei.com>";

    description
      "This YANG module defines a model for managing Virtual Router
     Redundancy Protocol (VRRP) versions 2 and 3.

     Copyright (c) 2018 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 Simplified 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 8347; see the
     RFC itself for full legal notices.";

    revision "2018-03-13" {
      description "Initial revision.";
      reference
        "RFC 8347: A YANG Data Model for the Virtual Router Redundancy
        	  Protocol (VRRP)
         RFC 2787: Definitions of Managed Objects for the Virtual
        	  Router Redundancy Protocol
         RFC 3768: Virtual Router Redundancy Protocol (VRRP)
         RFC 5798: Virtual Router Redundancy Protocol (VRRP)
        	  Version 3 for IPv4 and IPv6
         RFC 6527: Definitions of Managed Objects for the Virtual
        	  Router Redundancy Protocol Version 3 (VRRPv3)";

    }


    feature validate-interval-errors {
      description
        "This feature indicates that the system validates that the
       advertisement interval from advertisement packets received
       is the same as the interval configured for the local
       VRRP router.";
    }

    feature validate-address-list-errors {
      description
        "This feature indicates that the system validates that
       the address list from received packets matches the
       locally configured list for the VRRP router.";
    }

    typedef new-master-reason-type {
      type enumeration {
        enum "not-master" {
          value 0;
          description
            "The virtual router has never transitioned to master
           state.";
        }
        enum "priority" {
          value 1;
          description "Priority was higher.";
        }
        enum "preempted" {
          value 2;
          description
            "The master was preempted.";
        }
        enum "no-response" {
          value 3;
          description
            "Previous master did not respond.";
        }
      }
      description
        "Indicates why the virtual router has transitioned to
       master state.";
    }

    identity vrrp-event-type {
      description
        "Indicates the type of a VRRP protocol event.";
    }

    identity vrrp-event-none {
      base vrrp-event-type;
      description
        "Indicates a non-meaningful event.";
    }

    identity vrrp-event-startup {
      base vrrp-event-type;
      description
        "Indicates that a VRRP router has initiated the protocol.";
    }

    identity vrrp-event-shutdown {
      base vrrp-event-type;
      description
        "Indicates that a VRRP router has closed down the protocol.";
    }

    identity vrrp-event-higher-priority-backup {
      base vrrp-event-type;
      description
        "Indicates that a backup router has a higher priority than
       the current master.";
    }

    identity vrrp-event-master-timeout {
      base vrrp-event-type;
      description
        "Indicates that the current master has not sent an
       advertisement within the limit of master-down-interval.";
    }

    identity vrrp-event-interface-up {
      base vrrp-event-type;
      description
        "Indicates that the VRRP-enabled interface has become
       'operational up'.";
    }

    identity vrrp-event-interface-down {
      base vrrp-event-type;
      description
        "Indicates that the VRRP-enabled interface has become
       'operational down'.";
    }

    identity vrrp-event-no-primary-ip-address {
      base vrrp-event-type;
      description
        "Indicates that the primary IP address on the VRRP-enabled
       interface has become unavailable.";
    }

    identity vrrp-event-primary-ip-address {
      base vrrp-event-type;
      description
        "Indicates that the primary IP address on the VRRP-enabled
       interface has become available.";
    }

    identity vrrp-event-no-virtual-ip-addresses {
      base vrrp-event-type;
      description
        "Indicates that there are no virtual IP addresses on the
       virtual router.";
    }

    identity vrrp-event-virtual-ip-addresses {
      base vrrp-event-type;
      description
        "Indicates that there are virtual IP addresses on the
       virtual router.";
    }

    identity vrrp-event-preempt-hold-timeout {
      base vrrp-event-type;
      description
        "Indicates that the configured preemption hold time has
       passed.";
    }

    identity vrrp-event-lower-priority-master {
      base vrrp-event-type;
      description
        "Indicates that there is a lower-priority VRRP master.";
    }

    identity vrrp-event-owner-preempt {
      base vrrp-event-type;
      description
        "Indicates that the owner has preempted another router to
       become the master.";
    }

    identity vrrp-error-global {
      description
        "Indicates the type of a VRRP error that occurred
       for a packet before it reaches a VRRP router.";
    }

    identity checksum-error {
      base vrrp-error-global;
      description
        "A packet has been received with an invalid VRRP checksum
       value.";
    }

    identity ip-ttl-error {
      base vrrp-error-global;
      description
        "A packet has been received with IP TTL (Time-To-Live)
       not equal to 255.";
    }

    identity version-error {
      base vrrp-error-global;
      description
        "A packet has been received with an unknown or unsupported
       version number.";
    }

    identity vrid-error {
      base vrrp-error-global;
      description
        "A packet has been received with a Virtual Router Identifier
       (VRID) that is not valid for any virtual router on this
       router.";
    }

    identity vrrp-error-virtual-router {
      description
        "Indicates the type of a VRRP error that occurred
       after a packet reaches a VRRP router.";
    }

    identity address-list-error {
      base vrrp-error-virtual-router;
      description
        "A packet has been received with an address list that
       does not match the locally configured address list for
       the virtual router.";
    }

    identity interval-error {
      base vrrp-error-virtual-router;
      description
        "A packet has been received with an advertisement interval
       different than the interval configured for the local
       virtual router.";
    }

    identity packet-length-error {
      base vrrp-error-virtual-router;
      description
        "A packet has been received with a packet length less
       than the length of the VRRP header.";
    }

    identity vrrp-state-type {
      description
        "Indicates the state of a virtual router.";
    }

    identity initialize {
      base vrrp-state-type;
      description
        "Indicates that the virtual router is waiting
       for a startup event.";
    }

    identity backup {
      base vrrp-state-type;
      description
        "Indicates that the virtual router is monitoring the
       availability of the master router.";
    }

    identity master {
      base vrrp-state-type;
      description
        "Indicates that the virtual router is forwarding
       packets for IP addresses that are associated with
       this virtual router.";
    }

    identity vrrp-version {
      description "The version of VRRP.";
    }

    identity vrrp-v2 {
      base vrrp-version;
      description
        "Indicates version 2 of VRRP.";
    }

    identity vrrp-v3 {
      base vrrp-version;
      description
        "Indicates version 3 of VRRP.";
    }

    grouping vrrp-common-attributes {
      description
        "Group of VRRP attributes common to versions 2 and 3.";
      leaf vrid {
        type uint8 {
          range "1..255";
        }
        description
          "Virtual Router ID (i.e., VRID).";
      }

      leaf version {
        type identityref {
          base vrrp:vrrp-version;
        }
        mandatory true;
        description
          "Version 2 or 3 of VRRP.";
      }

      leaf log-state-change {
        type boolean;
        default "false";
        description
          "Generates VRRP state change messages each time the
         VRRP instance changes state (from 'up' to 'down'
         or 'down' to 'up').";
      }

      container preempt {
        description
          "Enables a higher-priority VRRP backup router to preempt a
         lower-priority VRRP master.";
        leaf enabled {
          type boolean;
          default "true";
          description
            "'true' if preemption is enabled.";
        }

        leaf hold-time {
          type uint16;
          units "seconds";
          default '0';
          description
            "Hold time, in seconds, for which a higher-priority VRRP
           backup router must wait before preempting a lower-priority
           VRRP master.";
        }
      }  // container preempt

      leaf priority {
        type uint8 {
          range "1..254";
        }
        default '100';
        description
          "Configures the VRRP election priority for the backup
         virtual router.";
      }

      leaf accept-mode {
        when
          "derived-from-or-self(current()/../version, 'vrrp-v3')" {
          description
            "Applicable only to version 3.";
        }
        type boolean;
        default "false";
        description
          "Controls whether a virtual router in master state will
         accept packets addressed to the address owner's IPvX address
         as its own if it is not the IPvX address owner.  The default
         is 'false'.  Deployments that rely on, for example, pinging
         the address owner's IPvX address may wish to configure
         accept-mode to 'true'.

         Note: IPv6 Neighbor Solicitations and Neighbor
         Advertisements MUST NOT be dropped when accept-mode
         is 'false'.";
      }
    }  // grouping vrrp-common-attributes

    grouping vrrp-ipv4-attributes {
      description
        "Group of VRRP attributes for IPv4.";
      uses vrrp-common-attributes;

      choice advertise-interval-choice {
        description
          "The options for the advertisement interval at which VRRPv2
         or VRRPv3 advertisements are sent from the specified
         interface.";
        case v2 {
          when
            "derived-from-or-self(version, 'vrrp-v2')" {
            description
              "Applicable only to version 2.";
          }
          leaf advertise-interval-sec {
            type uint8 {
              range "1..254";
            }
            units "seconds";
            default '1';
            description
              "Configures the interval that VRRPv2 advertisements
             are sent from the specified interface.";
          }
        }  // case v2

        case v3 {
          when
            "derived-from-or-self(version, 'vrrp-v3')" {
            description
              "Applicable only to version 3.";
          }
          leaf advertise-interval-centi-sec {
            type uint16 {
              range "1..4095";
            }
            units "centiseconds";
            default '100';
            description
              "Configures the interval that VRRPv3 advertisements
             are sent from the specified interface.";
          }
        }  // case v3
      }  // choice advertise-interval-choice

      container track {
        description
          "Enables the specified VRRP instance to track interfaces
         or networks.";
        container interfaces {
          description
            "Enables the specified VRRPv2 or VRRPv3 instance to track
           interfaces.  Interface tracking prevents traffic loss by
           detecting the availability of interfaces.  The operational
           states of other interfaces are associated with the
           priority of a VRRP router.  When a tracked interface
           becomes unavailable (or 'operational down'), the priority
           of the VRRP router decrements.  When an unavailable
           interface becomes available again, the priority of the
           VRRP router is incremented by the same amount.";
          list interface {
            key "interface";
            description
              "Interface to track.";
            leaf interface {
              type if:interface-ref;
              must
                "/if:interfaces/if:interface[if:name=current()]/"
                  + "ip:ipv4" {
                description
                  "Interface is IPv4.";
              }
              description
                "Interface to track.";
            }

            leaf priority-decrement {
              type uint8 {
                range "1..254";
              }
              default '10';
              description
                "Specifies how much to decrement the priority of the
               VRRP instance if the interface goes down.";
            }
          }  // list interface
        }  // container interfaces

        container networks {
          description
            "Enables the VRRPv2 or VRRPv3 router instance to track the
           specified networks through their IPv4 network prefixes.
           Network tracking prevents traffic loss by detecting
           network connectivity failure.  The states of
           connectivity to some networks are associated with the
           priority of a VRRP router.  When connectivity to a
           tracked network represented by its prefix is lost, the
           priority of the VRRP router decrements.  When an
           unavailable network is again reachable, the priority of
           the VRRP router is incremented by the same amount.";
          list network {
            key "prefix";
            description
              "Enables the specified VRRPv2 or VRRPv3 instance to
             track an IPv4 network by specifying the prefix of the
             IPv4 network.";
            leaf prefix {
              type inet:ipv4-prefix;
              description
                "The IPv4 prefix of the network to track.";
            }

            leaf priority-decrement {
              type uint8 {
                range "1..254";
              }
              default '10';
              description
                "Specifies how much to decrement the priority of the
               VRRP router if there is a failure in the IPv4
               network.";
            }
          }  // list network
        }  // container networks
      }  // container track

      container virtual-ipv4-addresses {
        description
          "Configures the virtual IPv4 address for the
         VRRP interface.";
        list virtual-ipv4-address {
          key "ipv4-address";
          max-elements 16;
          description
            "Virtual IPv4 addresses for a single VRRP instance.  For a
           VRRP owner router, the virtual address must match one
           of the IPv4 addresses configured on the interface
           corresponding to the virtual router.";
          leaf ipv4-address {
            type inet:ipv4-address;
            description
              "An IPv4 address associated with a virtual router.";
            reference
              "RFC 5798: Virtual Router Redundancy Protocol (VRRP)
              	  Version 3 for IPv4 and IPv6.  Section 1.2";

          }
        }  // list virtual-ipv4-address
      }  // container virtual-ipv4-addresses
    }  // grouping vrrp-ipv4-attributes

    grouping vrrp-ipv6-attributes {
      description
        "Group of VRRP attributes for IPv6.";
      uses vrrp-common-attributes;

      leaf advertise-interval-centi-sec {
        type uint16 {
          range "1..4095";
        }
        units "centiseconds";
        default '100';
        description
          "Configures the interval that VRRPv3 advertisements
         are sent from the specified interface.";
      }

      container track {
        description
          "Enables the specified VRRP instance to track interfaces
         or networks.";
        container interfaces {
          description
            "Enables the specified VRRPv2 or VRRPv3 instance to track
           interfaces.  Interface tracking prevents traffic loss by
           detecting the availability of interfaces.  The operational
           states of other interfaces are associated with the
           priority of a VRRP router.  When a tracked interface
           becomes unavailable (or 'operational down'), the priority
           of the VRRP router decrements.  When an unavailable
           interface becomes available again, the priority of the
           VRRP router is incremented by the same amount.";
          list interface {
            key "interface";
            description
              "Interface to track.";
            leaf interface {
              type if:interface-ref;
              must
                "/if:interfaces/if:interface[if:name=current()]/"
                  + "ip:ipv6" {
                description
                  "Interface is IPv6.";
              }
              description
                "Interface to track.";
            }

            leaf priority-decrement {
              type uint8 {
                range "1..254";
              }
              default '10';
              description
                "Specifies how much to decrement the priority of the
               VRRP instance if the interface goes down.";
            }
          }  // list interface
        }  // container interfaces

        container networks {
          description
            "Enables the VRRPv2 or VRRPv3 router instance to track the
           specified networks through their IPv6 network prefixes.
           Network tracking prevents traffic loss by detecting
           network connectivity failure.  The states of
           connectivity to some networks are associated with the
           priority of a VRRP router.  When connectivity to a
           tracked network represented by its prefix is lost, the
           priority of the VRRP router decrements.  When an
           unavailable network is again reachable, the priority of
           the VRRP router is incremented by the same amount.";
          list network {
            key "prefix";
            description
              "Enables the specified VRRPv2 or VRRPv3 instance to
             track an IPv6 network by specifying the prefix of the
             IPv6 network.";
            leaf prefix {
              type inet:ipv6-prefix;
              description
                "The IPv6 prefix of the network to track.";
            }

            leaf priority-decrement {
              type uint8 {
                range "1..254";
              }
              default '10';
              description
                "Specifies how much to decrement the priority of the
               VRRP router if there is a failure in the IPv6
               network.";
            }
          }  // list network
        }  // container networks
      }  // container track

      container virtual-ipv6-addresses {
        description
          "Configures the virtual IPv6 address for the
         VRRP interface.";
        list virtual-ipv6-address {
          key "ipv6-address";
          max-elements 2;
          description
            "Two IPv6 addresses are allowed.  The first address must
           be a link-local address.  The second address can be a
           link-local or global address.";
          leaf ipv6-address {
            type inet:ipv6-address;
            description
              "An IPv6 address associated with a virtual router.";
            reference
              "RFC 5798: Virtual Router Redundancy Protocol (VRRP)
              	  Version 3 for IPv4 and IPv6.  Section 1.3";

          }
        }  // list virtual-ipv6-address
      }  // container virtual-ipv6-addresses
    }  // grouping vrrp-ipv6-attributes

    grouping vrrp-state-attributes {
      description
        "Group of VRRP state attributes.";
      leaf state {
        type identityref {
          base vrrp:vrrp-state-type;
        }
        config false;
        description "Operational state.";
      }

      leaf is-owner {
        type boolean;
        config false;
        description
          "Set to 'true' if this virtual router is the owner.";
      }

      leaf last-adv-source {
        type inet:ip-address;
        config false;
        description
          "Last advertised IPv4/IPv6 source address.";
      }

      leaf up-datetime {
        type yang:date-and-time;
        config false;
        description
          "The date and time when this virtual router
         transitioned out of 'init' state.";
      }

      leaf master-down-interval {
        type uint32;
        units "centiseconds";
        config false;
        description
          "Time interval for the backup virtual router to declare
         'master down'.";
      }

      leaf skew-time {
        type uint32;
        units "microseconds";
        config false;
        description
          "Calculated based on the priority and advertisement
         interval configuration command parameters.  See RFC 3768.";
      }

      leaf last-event {
        type identityref {
          base vrrp:vrrp-event-type;
        }
        config false;
        description "Last reported event.";
      }

      leaf new-master-reason {
        type new-master-reason-type;
        config false;
        description
          "Indicates why the virtual router has transitioned to
         master state.";
      }

      container statistics {
        config false;
        description "VRRP statistics.";
        leaf discontinuity-datetime {
          type yang:date-and-time;
          description
            "The time on the most recent occasion at which any one or
           more of the VRRP statistics counters suffered a
           discontinuity.  If no such discontinuities have occurred
           since the last re-initialization of the local management
           subsystem, then this node contains the time that the
           local management subsystem re-initialized itself.";
        }

        leaf master-transitions {
          type yang:counter32;
          description
            "The total number of times that this virtual router's
           state has transitioned to 'master'.";
        }

        leaf advertisement-rcvd {
          type yang:counter64;
          description
            "The total number of VRRP advertisements received by
           this virtual router.";
        }

        leaf advertisement-sent {
          type yang:counter64;
          description
            "The total number of VRRP advertisements sent by
           this virtual router.";
        }

        leaf interval-errors {
          if-feature validate-interval-errors;
          type yang:counter64;
          description
            "The total number of VRRP advertisement packets received
           with an advertisement interval different than the
           interval configured for the local virtual router.";
        }

        leaf priority-zero-pkts-rcvd {
          type yang:counter64;
          description
            "The total number of VRRP packets received by the
           virtual router with a priority of 0.";
        }

        leaf priority-zero-pkts-sent {
          type yang:counter64;
          description
            "The total number of VRRP packets sent by the
           virtual router with a priority of 0.";
        }

        leaf invalid-type-pkts-rcvd {
          type yang:counter64;
          description
            "The number of VRRP packets received by the virtual
           router with an invalid value in the 'type' field.";
        }

        leaf address-list-errors {
          if-feature validate-address-list-errors;
          type yang:counter64;
          description
            "The total number of packets received with an
           address list that does not match the locally
           configured address list for the virtual router.";
        }

        leaf packet-length-errors {
          type yang:counter64;
          description
            "The total number of packets received with a packet
           length less than the length of the VRRP header.";
        }
      }  // container statistics
    }  // grouping vrrp-state-attributes

    grouping vrrp-global-state-attributes {
      description
        "Group of VRRP global state attributes.";
      leaf virtual-routers {
        type uint32;
        description
          "Number of configured virtual routers.";
      }

      leaf interfaces {
        type uint32;
        description
          "Number of interfaces with VRRP configured.";
      }

      container statistics {
        description
          "VRRP global statistics.";
        leaf discontinuity-datetime {
          type yang:date-and-time;
          description
            "The time on the most recent occasion at which any
           one or more of checksum-errors, version-errors,
           vrid-errors, or ip-ttl-errors suffered a
           discontinuity.

           If no such discontinuities have occurred since the last
           re-initialization of the local management subsystem,
           then this node contains the time that the local management
           subsystem re-initialized itself.";
        }

        leaf checksum-errors {
          type yang:counter64;
          description
            "The total number of VRRP packets received with an invalid
           VRRP checksum value.";
          reference
            "RFC 5798: Virtual Router Redundancy Protocol (VRRP)
            	  Version 3 for IPv4 and IPv6.  Section 5.2.8";

        }

        leaf version-errors {
          type yang:counter64;
          description
            "The total number of VRRP packets received with an unknown
           or unsupported version number.";
          reference
            "RFC 5798: Virtual Router Redundancy Protocol (VRRP)
            	  Version 3 for IPv4 and IPv6.  Section 5.2.1";

        }

        leaf vrid-errors {
          type yang:counter64;
          description
            "The total number of VRRP packets received with a VRID that
           is not valid for any virtual router on this router.";
          reference
            "RFC 5798: Virtual Router Redundancy Protocol (VRRP)
            	  Version 3 for IPv4 and IPv6.  Section 5.2.3";

        }

        leaf ip-ttl-errors {
          type yang:counter64;
          description
            "The total number of VRRP packets received by the
           virtual router with IP TTL (IPv4) or Hop Limit (IPv6)
           not equal to 255.";
          reference
            "RFC 5798: Virtual Router Redundancy Protocol (VRRP)
            	  Version 3 for IPv4 and IPv6.
            	  Sections 5.1.1.3 and 5.1.2.3";

        }
      }  // container statistics
    }  // grouping vrrp-global-state-attributes

    augment /if:interfaces/if:interface/ip:ipv4 {
      description "Augments IPv4 interface.";
      container vrrp {
        description
          "Configures VRRP version 2 or 3 for IPv4.";
        list vrrp-instance {
          key "vrid";
          description
            "Defines a virtual router, identified by a VRID, within the
           IPv4 address space.";
          uses vrrp-ipv4-attributes;

          uses vrrp-state-attributes;
        }  // list vrrp-instance
      }  // container vrrp
    }

    augment /if:interfaces/if:interface/ip:ipv6 {
      description "Augments IPv6 interface.";
      container vrrp {
        description
          "Configures VRRP version 3 for IPv6.";
        list vrrp-instance {
          must
            "derived-from-or-self(version, 'vrrp-v3')" {
            description
              "IPv6 is only supported by version 3.";
          }
          key "vrid";
          description
            "Defines a virtual router, identified by a VRID, within the
           IPv6 address space.";
          uses vrrp-ipv6-attributes;

          uses vrrp-state-attributes;
        }  // list vrrp-instance
      }  // container vrrp
    }

    container vrrp {
      config false;
      description
        "VRRP data at the global level.";
      uses vrrp-global-state-attributes;
    }  // container vrrp

    notification vrrp-new-master-event {
      description
        "Notification event for the election of a new VRRP master.";
      leaf master-ip-address {
        type inet:ip-address;
        mandatory true;
        description
          "IPv4 or IPv6 address of the new master.";
      }

      leaf new-master-reason {
        type new-master-reason-type;
        mandatory true;
        description
          "Indicates why the virtual router has transitioned to
         master state.";
      }
    }  // notification vrrp-new-master-event

    notification vrrp-protocol-error-event {
      description
        "Notification event for a VRRP protocol error.";
      leaf protocol-error-reason {
        type identityref {
          base vrrp:vrrp-error-global;
        }
        mandatory true;
        description
          "Indicates the reason for the protocol error.";
      }
    }  // notification vrrp-protocol-error-event

    notification vrrp-virtual-router-error-event {
      description
        "Notification event for an error that happened on a
       virtual router.";
      leaf interface {
        type if:interface-ref;
        mandatory true;
        description
          "Indicates the interface on which the event has occurred.";
      }

      choice ip-version {
        mandatory true;
        description
          "The error may have happened on either an IPv4 virtual
         router or an IPv6 virtual router.  The information
         related to a specific IP version is provided by one of
         the following cases.";
        case ipv4 {
          description "IPv4.";
          container ipv4 {
            description
              "Error information for IPv4.";
            leaf vrid {
              type leafref {
                path "/if:interfaces/if:interface[if:name = current()/../../vrrp:interface]/ip:ipv4/vrrp:vrrp/vrrp:vrrp-instance/vrrp:vrid";
              }
              mandatory true;
              description
                "Indicates the virtual router on which the event has
               occurred.";
            }
          }  // container ipv4
        }  // case ipv4

        case ipv6 {
          description "IPv6.";
          container ipv6 {
            description
              "Error information for IPv6.";
            leaf vrid {
              type leafref {
                path "/if:interfaces/if:interface[if:name = current()/../../vrrp:interface]/ip:ipv6/vrrp:vrrp/vrrp:vrrp-instance/vrrp:vrid";
              }
              mandatory true;
              description
                "Indicates the virtual router on which the event has
               occurred.";
            }
          }  // container ipv6
        }  // case ipv6
      }  // choice ip-version

      leaf virtual-router-error-reason {
        type identityref {
          base vrrp:vrrp-error-virtual-router;
        }
        mandatory true;
        description
          "Indicates the reason for the virtual router error.";
      }
    }  // notification vrrp-virtual-router-error-event
  }  // module ietf-vrrp