module Cisco-IOS-XR-ipv6-nd-cfg {

    yang-version 1;

    namespace
      "http://cisco.com/ns/yang/Cisco-IOS-XR-ipv6-nd-cfg";

    prefix ipv6-nd-cfg;

    import ietf-inet-types {
      prefix inet;
    }
    import ietf-yang-types {
      prefix yang;
    }
    import Cisco-IOS-XR-types {
      prefix xr;
    }
    import cisco-semver {
      prefix semver;
    }
    import Cisco-IOS-XR-ifmgr-cfg {
      prefix a1;
    }

    organization "Cisco Systems, Inc.";

    contact
      "Cisco Systems, Inc.
     Customer Service
     
     Postal: 170 West Tasman Drive
     San Jose, CA 95134
     
     Tel: +1 800 553-NETS
     
     E-mail: cs-yang@cisco.com";

    description
      "This module contains a collection of YANG definitions
     for Cisco IOS-XR ipv6-nd package configuration.
     
     This module contains definitions
     for the following management objects:
       ipv6-neighbor: IPv6 neighbor or neighbor discovery
         configuration
     
     This YANG module augments the
       Cisco-IOS-XR-ifmgr-cfg
     module with configuration data.
     
     Copyright (c) 2013-2019 by Cisco Systems, Inc.
     All rights reserved.";

    revision "2019-10-31" {
      description "Added mandatory nodes.";
    }

    revision "2019-04-05" {
      description
        "Establish semantic version baseline.";
    }

    revision "2017-05-01" {
      description
        "Fixing backward compatibility error in module.";
    }

    revision "2015-11-09" {
      description "IOS XR 6.0 revision.";
    }

    semver:module-version "2.0.0";
    semver:module-version "1.0.0";

    typedef Ipv6srp-encapsulation {
      type enumeration {
        enum "srpa" {
          value 5;
          description
            "Encapsulation type SRP, prefer side A";
        }
        enum "srpb" {
          value 6;
          description
            "Encapsulation type SRP, prefer side B";
        }
      }
      description "Ipv6srp encapsulation";
    }

    typedef Ipv6nd-month {
      type enumeration {
        enum "january" {
          value 0;
          description "January";
        }
        enum "february" {
          value 1;
          description "February";
        }
        enum "march" {
          value 2;
          description "March";
        }
        enum "april" {
          value 3;
          description "April";
        }
        enum "may" {
          value 4;
          description "May";
        }
        enum "june" {
          value 5;
          description "June";
        }
        enum "july" {
          value 6;
          description "July";
        }
        enum "august" {
          value 7;
          description "August";
        }
        enum "september" {
          value 8;
          description "September";
        }
        enum "october" {
          value 9;
          description "October";
        }
        enum "november" {
          value 10;
          description "November";
        }
        enum "december" {
          value 11;
          description "December";
        }
      }
      description "Ipv6nd month";
    }

    typedef Ipv6-nd-router-pref {
      type enumeration {
        enum "high" {
          value 1;
          description "High preference";
        }
        enum "medium" {
          value 2;
          description "Medium preference";
        }
        enum "low" {
          value 3;
          description "Low preference";
        }
      }
      description "Ipv6 nd router pref";
    }

    container ipv6-neighbor {
      description
        "IPv6 neighbor or neighbor discovery configuration";
      container neighbors {
        description "IPv6 neighbors";
        list neighbor {
          key "neighbor-address interface-name";
          description
            "IPv6 neighbor configuration";
          leaf neighbor-address {
            type inet:ipv6-address-no-zone;
            description "IPv6 address";
          }

          leaf interface-name {
            type xr:Interface-name;
            description "Interface name";
          }

          leaf zone {
            type string;
            mandatory true;
            description "IPv6 address zone";
          }

          leaf mac-address {
            type yang:mac-address;
            mandatory true;
            description
              "48-bit hardware address H.H.H";
          }

          leaf encapsulation {
            type Ipv6srp-encapsulation;
            description
              "Encapsulation type only if interface type is
             SRP";
          }
        }  // list neighbor
      }  // container neighbors

      leaf scavenge-timeout {
        type uint32 {
          range "1..43200";
        }
        units "second";
        description
          "Set lifetime for stale neighbor";
      }

      leaf cos {
        type uint32 {
          range "0..7";
        }
        description
          "Set cos value for both outer vlan and inner vlan
         (if present) in all ougoing ND control packets";
      }
    }  // container ipv6-neighbor
  }  // module Cisco-IOS-XR-ipv6-nd-cfg