module Cisco-IOS-XE-isis-oper {

    yang-version 1;

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

    prefix isis-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
     ISIS operational data.
     Copyright (c) 2020 by Cisco Systems, Inc.
     All rights reserved.";

    revision "2020-11-01" {
      description "Initial revision";
      reference
        "1.0.0";

    }

    cisco-semver:module-version "1.0.0";

    typedef isis-level-type {
      type enumeration {
        enum "isis-level-1" {
          value 0;
          description "Level 1 adjacency";
        }
        enum "isis-level-2" {
          value 1;
          description "Level 2 adjacency";
        }
      }
      description "Level of ISIS adjacency";
    }

    typedef isis-neighbor-state {
      type enumeration {
        enum "isis-adj-up" {
          value 0;
          description
            "Adjacency is in UP state";
        }
        enum "isis-adj-down" {
          value 1;
          description
            "Adjacency is in DOWN state";
        }
        enum "isis-adj-init" {
          value 2;
          description
            "Adjacency is in INIT state";
        }
        enum "isis-adj-standby" {
          value 3;
          description
            "Adjacency is in STANDBY state";
        }
      }
      description
        "Current state of ISIS adjacency";
    }

    grouping isis-neighbor-key {
      description
        "Compound key that identifies a unique neighbor within an ISIS tag";
      leaf system-id {
        type yang:phys-address;
        description
          "System ID of the neighbor";
      }

      leaf level {
        type isis-level-type;
        description
          "Level of the adjacency formed";
      }

      leaf if-name {
        type string;
        description
          "Interface name on which adjacency is formed";
      }
    }  // grouping isis-neighbor-key

    grouping isis-neighbor-rec {
      description
        "Details of the adjacency formed";
      leaf ipv4-address {
        type inet:ip-address;
        description
          "IPv4 Address of the neighbor";
      }

      leaf ipv6-address {
        type inet:ip-address;
        description
          "IPv6 Address of the neighbor";
      }

      leaf state {
        type isis-neighbor-state;
        description
          "Current state of the adjacency";
      }

      leaf holdtime {
        type uint32;
        units "seconds";
        description
          "Holdtime of the adjacency";
      }
    }  // grouping isis-neighbor-rec

    grouping isis-tag-type {
      description
        "Each entry contains tag information of single IS-IS instance";
      leaf tag {
        type string;
        description "IS-IS router tag";
      }

      list isis-neighbor {
        key "system-id level if-name";
        description
          "List of neighbors for a specific tag";
        uses isis-ios-xe-oper:isis-neighbor-rec;

        uses isis-ios-xe-oper:isis-neighbor-key;
      }  // list isis-neighbor
    }  // grouping isis-tag-type

    container isis-oper-data {
      config false;
      description
        "Operational state of the IS-IS subsystem";
      list isis-instance {
        key "tag";
        description "List of ISIS routers";
        uses isis-ios-xe-oper:isis-tag-type;
      }  // list isis-instance
    }  // container isis-oper-data
  }  // module Cisco-IOS-XE-isis-oper