module ietf-bfd-mpls {

    yang-version 1.1;

    namespace
      "urn:ietf:params:xml:ns:yang:ietf-bfd-mpls";

    prefix bfd-mpls;

    import ietf-bfd-types {
      prefix bfd-types;
      reference
        "RFC 9314: YANG Data Model for Bidirectional Forwarding
        Detection (BFD)";


    }
    import ietf-bfd {
      prefix bfd;
      reference
        "RFC 9314: YANG Data Model for Bidirectional Forwarding
        Detection (BFD)";


    }
    import ietf-inet-types {
      prefix inet;
      reference
        "RFC 6991: Common YANG Data Types";


    }
    import ietf-routing {
      prefix rt;
      reference
        "RFC 8349: A YANG Data Model for Routing Management
        (NMDA Version)";


    }

    organization "IETF BFD Working Group";

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

     Editor:   Reshad Rahman
               <mailto:reshad@yahoo.com>

     Editor:   Lianshu Zheng
               <mailto:veronique_cheng@hotmail.com>

     Editor:   Mahesh Jethanandani
               <mailto:mjethanandani@gmail.com>";

    description
      "This module contains the YANG definition for BFD parameters for
     MPLS LSPs as per RFC 5884.

     Copyright (c) 2022 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 Revised 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 9314; see the
     RFC itself for full legal notices.";

    reference
      "RFC 5884: Bidirectional Forwarding Detection (BFD)
      for MPLS Label Switched Paths (LSPs)
       RFC 9314: YANG Data Model for Bidirectional Forwarding
      Detection (BFD)";


    revision "2022-09-22" {
      description
        "Updates to use base-cfg-parms instead of client-cfg-parms,
       and add the enabled flag.";
      reference
        "RFC 9314: YANG Data Model for Bidirectional Forwarding
        Detection (BFD).";

    }

    revision "2021-10-21" {
      description "Initial revision.";
      reference
        "RFC 9127: YANG Data Model for Bidirectional Forwarding
        Detection (BFD)";

    }


    identity encap-gach {
      base bfd-types:encap-type;
      description
        "BFD with Generic Associated Channel (G-ACh) encapsulation
       as per RFC 5586.";
      reference
        "RFC 5586: MPLS Generic Associated Channel";

    }

    identity encap-ip-gach {
      base bfd-types:encap-type;
      description
        "BFD with IP and G-ACh encapsulation as per RFC 5586.";
    }

    notification mpls-notification {
      description
        "Notification for BFD-over-MPLS FEC session state change.
       An implementation may rate-limit notifications, e.g., when a
       session is continuously changing state.";
      leaf local-discr {
        type discriminator;
        description
          "BFD local discriminator.";
      }

      leaf remote-discr {
        type discriminator;
        description
          "BFD remote discriminator.";
      }

      leaf new-state {
        type state;
        description "Current BFD state.";
      }

      leaf state-change-reason {
        type iana-bfd-types:diagnostic;
        description
          "Reason for the BFD state change.";
      }

      leaf time-of-last-state-change {
        type yang:date-and-time;
        description
          "Calendar time of the most recent previous state change.";
      }

      leaf dest-addr {
        type inet:ip-address;
        description "BFD peer address.";
      }

      leaf source-addr {
        type inet:ip-address;
        description "BFD local address.";
      }

      leaf session-index {
        type uint32;
        description
          "An index used to uniquely identify BFD sessions.";
      }

      leaf path-type {
        type identityref {
          base path-type;
        }
        description "BFD path type.";
      }

      leaf mpls-dest-address {
        type inet:ip-address;
        description
          "Destination address as per RFC 5884.
         Needed if IP encapsulation is used.";
      }
    }  // notification mpls-notification
  }  // module ietf-bfd-mpls