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// SPDX-License-Identifier: BSD-2-Clause
module frr-eigrpd {
  yang-version 1.1;
  namespace "http://frrouting.org/yang/eigrpd";
  prefix frr-eigrpd;

  import ietf-inet-types {
    prefix inet;
  }
  import ietf-yang-types {
    prefix yang;
  }
  import frr-interface {
    prefix frr-interface;
  }
  import frr-vrf {
    prefix frr-vrf;
  }
  import frr-route-map {
    prefix frr-route-map;
  }
  import frr-route-types {
    prefix frr-route-types;
  }

  organization "FRRouting";
  contact
    "FRR Users List:       <mailto:frog@lists.frrouting.org>
     FRR Development List: <mailto:dev@lists.frrouting.org>";
  description
    "This module defines a model for managing FRR eigrpd daemon.

     Copyright 2020 FRRouting

     Redistribution and use in source and binary forms, with or without
     modification, are permitted provided that the following conditions
     are met:

     1. Redistributions of source code must retain the above copyright notice,
     this list of conditions and the following disclaimer.

     2. Redistributions in binary form must reproduce the above copyright
     notice, this list of conditions and the following disclaimer in the
     documentation and/or other materials provided with the distribution.

     THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     \"AS IS\" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.";

  revision 2019-09-09 {
    description
      "Changed interface references to use
      frr-interface:interface-ref typedef";
  }
  revision 2019-06-19 {
    description "Initial revision.";
    reference
      "RFC 7868: Cisco's Enhanced Interior Gateway Routing Protocol (EIGRP).";
  }

  /*
   * Types specification.
   */
  typedef autonomous-system {
    description "Administrative domain identification for a network";
    type uint16 {
      range 1..65535;
    }
  }

  typedef authentication-type {
    description "Authentication types";
    type enumeration {
      enum none {
        description "Don't authenticate";
        value 0;
      }

      enum text {
        description "User defined text";
        value 1;
      }

      enum md5 {
        description "MD5 algorithm";
        value 2;
      }

      enum hmac-sha-256 {
        description "HMAC SHA256 algorithm";
        value 3;
      }
    }
  }

  /*
   * EIGRP operational data.
   */
  container eigrpd {
    list instance {
      key "asn vrf";
      description "EIGRP autonomous system instance";

      leaf asn {
        description "Autonomous System Number";
        type autonomous-system;
      }

      leaf vrf {
        description "Virtual Routing Domain name";
        type frr-vrf:vrf-ref;
      }

      /*
       * Configurations.
       */
      leaf router-id {
        description "Router identification";
        type inet:ipv4-address;
      }

      leaf-list passive-interface {
        description "List of suppressed interfaces";
        type frr-interface:interface-ref;
      }

      leaf active-time {
        description "ACTIVE time limit in seconds (0 disables limit)";
        type uint16 {
          range "0..65535";
        }
        units seconds;
        default 180;
      }

      leaf variance {
        description "Control load balance variance";
        type uint8 {
          range "1..128";
        }
      }

      leaf maximum-paths {
        description "Most number of paths to forward packets to";
        type uint8 {
          range "1..32";
        }
      }

      container metric-weights {
        description
          "Metrics and parameters for advertisement.

           EIGRP calculates the composite metric with the following formula:

               metric = 256 * ({(K1*BW) + [(K2*BW)/(256-LOAD)] + (K3*DELAY)} *
                        (K5/(REL+K4)))

           Composite calculation:
                                                                         K5
               metric =[(K1*Net-Throughput) + Latency)+(K6*ExtAttr)] * ------
                                                                       K4+Rel

           RFC 7868 Sections 5.5 and 5.6.2.5.";

        leaf K1 {
          description "Bandwidth coefficient.";
          type uint8 {
            range "0..255";
          }
        }

        leaf K2 {
          description "Bandwidth on load coefficient.";
          type uint8 {
            range "0..255";
          }
        }

        leaf K3 {
          description "Delay or latency-based coefficient.";
          type uint8 {
            range "0..255";
          }
        }

        leaf K4 {
          description "Link quality coefficient.";
          type uint8 {
            range "0..255";
          }
        }

        leaf K5 {
          description "Packet loss coefficient.";
          type uint8 {
            range "0..255";
          }
        }

        leaf K6 {
          description "Jitter coefficient.";
          type uint8 {
            range "0..255";
          }
        }
      }

      leaf-list network {
        description "Enable EIGRP on the specific network";
        type inet:ipv4-prefix;
      }

      leaf-list neighbor {
        description "Specific EIGRP neighbor";
        type inet:ipv4-address;
      }

      list redistribute {
        description "Redistribute routes learned from other routing protocols";

        key "protocol";

        leaf protocol {
          description "Routing protocol";
          type frr-route-types:frr-route-types-v4;
          must '. != "eigrp"';
        }

        leaf route-map {
          description
            "Applies the conditions of the specified route-map to
             routes that are redistributed into the EIGRP routing
             instance";
          type frr-route-map:route-map-ref;
        }

        container metrics {
          description "Metric for the redistributed routes";

          leaf bandwidth {
            description "Bandwidth metric in Kbits per second";
            type uint32 {
              range "1..4294967295";
            }
          }

          leaf delay {
            description "Delay metric";
            units microseconds;
            type uint32 {
              range "0..4294967295";
            }
          }

          leaf reliability {
            description "Reliability metric";
            type uint32 {
              range "0..255";
            }
          }

          leaf load {
            description "Effective bandwidth usage";
            type uint32 {
              range "1..255";
            }
          }

          leaf mtu {
            description "Path Maximum Transmission Unit";
            type uint32 {
              range "1..65535";
            }
          }
        }
      }
    }
  }

  /*
   * EIGRP interface configurations.
   */
   augment "/frr-interface:lib/frr-interface:interface" {
     container eigrp {
       description "EIGRP interface parameters";

       leaf delay {
         description "Throughput delay";
         type uint32 {
           range "1..16777215";
         }
         default 10;
       }

       leaf bandwidth {
         description "Interface bandwidth value";
         type uint32 {
           range "1..10000000";
         }
         default 100000;
       }

       leaf hello-interval {
         description "Hello packet interval";
         type uint16 {
           range "1..65535";
         }
         units seconds;
         default 5;
       }

       leaf hold-time {
         description "Timeout amount to consider neighbor down";
         type uint16 {
           range "1..65535";
         }
         units seconds;
         default 15;
       }

       leaf split-horizon {
         description "Perform split horizon loop preventing technique";
         type boolean;
         default true;
       }

       /*
        * Per AS configuration.
        */
       list instance {
         description "Autonomous System specific configuration";

         key "asn";

         leaf asn {
           description "Autonomous System Number";
           type autonomous-system;
         }

         leaf-list summarize-addresses {
           description "Peform address summarization";
           type inet:ipv4-prefix;
         }

         leaf authentication {
           description "Authentication digest algorithm";
           type authentication-type;
           default "none";
         }

         leaf keychain {
           description "FRR key chain name to use with authentication";
           type string;
         }
       }
     }
   }
}