module Cisco-IOS-XE-ipv6-oper {

    yang-version 1;

    namespace
      "http://cisco.com/ns/yang/Cisco-IOS-XE-ipv6-oper";

    prefix ipv6-ios-xe-oper;

    import ietf-inet-types {
      prefix inet;
    }
    import ietf-yang-types {
      prefix yang;
    }
    import cisco-semver {
      prefix cisco-semver;
    }

    organization "Cisco Systems, Inc.";

    contact
      "Cisco Systems, Inc.
     Customer Service

     Postal: 170 W Tasman Drive
     San Jose, CA 95134

     Tel: +1 1800 553-NETS

     E-mail: cs-yang@cisco.com";

    description
      "This module contains a collection of YANG definitions
     for IPv6 operational data.
     Copyright (c) 2017, 2019 by Cisco Systems, Inc.
     All rights reserved.";

    revision "2019-05-01" {
      description "Added semantic version";
      reference
        "1.2.0";

    }

    revision "2018-10-29" {
      description
        "Cleaned up spelling errors in descriptions.";
      reference
        "1.1.0";

    }

    revision "2017-11-01" {
      description "Initial revision";
      reference
        "1.0.0";

    }

    cisco-semver:module-version "1.2.0";
    cisco-semver:module-version "1.1.0";
    cisco-semver:module-version "1.0.0";

    typedef ipv6-nd-tdl-state {
      type enumeration {
        enum "ipv6-nd-incomplete" {
          value 0;
          description
            "Address resolution is in progress and the
           link-layer address of the neighbor has not
           yet been determined.";
        }
        enum "ipv6-nd-reachable" {
          value 1;
          description
            "The neighbor is known to have been reachable
           recently (within tens of seconds ago).";
        }
        enum "ipv6-nd-stale" {
          value 2;
          description
            "The neighbor is no longer known to be reachable
           but until traffic is sent to the neighbor, no
           attempt should be made to verify its reachability";
        }
        enum "ipv6-nd-glean" {
          value 3;
          description
            "Received updated link-layer information.
           Behaviour like STALE.";
        }
        enum "ipv6-nd-delay" {
          value 4;
          description
            "The neighbor is no longer known to be reachable, and traffic
           has recently been sent to the neighbor. Rather than probe the
           neighbor immediately, however, delay sending probes for a short
           while in order to give upper layer protocols a chance to provide
           reachability confirmation.";
        }
        enum "ipv6-nd-probe" {
          value 5;
          description
            "The neighbor is no longer known to be reachable, and unicast
           Neighbor Solicitation probes are being sent to verify
           reachability.";
        }
        enum "ipv6-nd-delete" {
          value 6;
          description "Entry is deleted.";
        }
      }
      description
        "Indicate the current state of
       the Neighbor-Discovery entry.";
    }

    grouping nd6-info-key {
      description
        "Key for IPv6 neighbor information table";
      leaf vrf-name {
        type string;
        description
          "The Virtual Router and Forwarding instance that
         this neighbor information is associated with";
      }

      leaf if-name {
        type string;
        description "The Interface name.";
      }

      leaf ip {
        type inet:ip-address;
        description
          "IPv6 address of this neighbor entry";
      }
    }  // grouping nd6-info-key

    grouping nd6-info {
      description
        "Value for IPv6 neighbor info table entry";
      leaf mac-address {
        type yang:mac-address;
        description "MAC address";
      }

      leaf state {
        type ipv6-nd-tdl-state;
        description "State of the entry";
      }

      leaf idle-timer {
        type uint32;
        description
          "Time before expiration, in seconds.";
      }

      leaf uptime {
        type uint32;
        description
          "Indicates how long this neighbor entry has
         been active, in seconds";
      }
    }  // grouping nd6-info

    container ipv6-data {
      config false;
      description
        "Operational state of IPv6";
      list nd6-info {
        key "vrf-name if-name ip";
        description "List of IPv6 neighbors";
        uses ipv6-ios-xe-oper:nd6-info-key;

        uses ipv6-ios-xe-oper:nd6-info;
      }  // list nd6-info
    }  // container ipv6-data
  }  // module Cisco-IOS-XE-ipv6-oper