ietf-mpls.yang

module ietf-mpls {
  yang-version 1.1;
  namespace "urn:ietf:params:xml:ns:yang:ietf-mpls";

  /* Replace with IANA when assigned */
  prefix "mpls";

  import ietf-routing {
    prefix "rt";
    reference "RFC8349: A YANG Data Model for Routing Management";
  }

  import ietf-routing-types {
    prefix "rt-types";
    reference "RFC8294:Common YANG Data Types for the Routing Area";
  }

  import ietf-interfaces {
    prefix "if";
    reference "RFC7223: A YANG Data Model for Interface Management";
  }

  organization "IETF MPLS Working Group";

  contact
    "WG Web:   <http://tools.ietf.org/wg/mpls/>

     WG List:  <mailto:mpls@ietf.org>

     WG Chair: Loa Andersson
               <mailto:loa@pi.nu>

     WG Chair: Nic Leymann
               <mailto:N.Leymann@telekom.de>

     Editor:   Tarek Saad
               <mailto:tsaad@cisco.com>

     Editor:   Kamran Raza
               <mailto:skraza@cisco.com>

     Editor:   Rakesh Gandhi
               <mailto:rgandhi@cisco.com>

     Editor:   Xufeng Liu
               <mailto: xufeng.liu.ietf@gmail.com>

     Editor:   Vishnu Pavan Beeram
               <mailto:vbeeram@juniper.net>";

  description
    "This YANG module defines the essential components for the
     management of the MPLS subsystem. The model fully conforms
     to the Network Management Datastore Architecture (NMDA).

     Copyright (c) 2018 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 Simplified 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 XXXX; see
     the RFC itself for full legal notices.";

  // RFC Ed.: replace XXXX with actual RFC number and remove this
  // note.

  // RFC Ed.: update the date below with the date of RFC publication
  // and remove this note.

  revision "2019-02-24" {
    description
      "Latest revision:
        - Addressed review comments";
    reference "RFC XXXX: A YANG Data Model for base MPLS";
  }

  /* Identities */

  identity mpls {
    base rt:address-family;
    description
      "This identity represents the MPLS address family.";
  }

  identity label-block-alloc-mode {
    description
      "Base identity label-block allocation mode";
  }

  identity label-block-alloc-mode-manager {
    base label-block-alloc-mode;
    description
      "Label block allocation on reserved block
       is managed by label manager";
  }

  identity label-block-alloc-mode-application {
    base label-block-alloc-mode;
    description
      "Label block allocation on reserved block
       is managed by application";
  }

  /**
   * Typedefs
   */
  typedef mpls-operations-type {
    type enumeration {
      enum impose-and-forward {
        description
          "Operation impose outgoing label(s) and forward to
           next-hop";
      }
      enum pop-and-forward {
        description
          "Operation pop incoming label and forward to next-hop";
      }
      enum pop-impose-and-forward {
        description
          "Operation pop incoming label, impose one or more
           outgoing label(s) and forward to next-hop";
      }
      enum swap-and-forward {
        description
          "Operation swap incoming label, with outgoing label and
           forward to next-hop";
      }
      enum pop-and-lookup {
        description
          "Operation pop incoming label and perform a lookup";
      }
    }
    description "MPLS operations types";
  }

  typedef nhlfe-role {
    type enumeration {
      enum PRIMARY {
        description
          "Next-hop acts as primary traffic carrying";
      }
      enum BACKUP {
        description
          "Next-hop acts as backup";
      }
      enum PRIMARY_AND_BACKUP {
        description
          "Next-hop acts as primary and backup simultaneously";
      }
    }
    description "The next-hop role";
  }

  grouping nhlfe-single-contents {
    description
      "MPLS simple NHLFE contents";
    uses rt-types:mpls-label-stack;
  }

  grouping nhlfe-multiple-contents {
    description
      "MPLS NHLFE contents";
    leaf index {
      type string;
      description
        "A user-specified identifier utilised to uniquely
         reference the next-hop entry in the next-hop list.
         The value of this index has no semantic meaning
         other than for referencing the entry.";
    }

    leaf backup-index {
      type string;
      description
        "A user-specified identifier utilised to uniquely
         reference the backup next-hop entry in the NHLFE list.
         The value of this index has no semantic meaning
         other than for referencing the entry.";
    }

    leaf loadshare {
      type uint16;
      description
        "This value is used to compute a loadshare to perform un-equal
         load balancing when multiple outgoing next-hop(s) are
         specified. A share is computed as a ratio of this number to the
         total under all next-hops(s).";
    }

    leaf role {
      type nhlfe-role;
      description "NHLFE role";
    }

    uses nhlfe-single-contents;
  }

  grouping interface-mpls-properties {
    description "MPLS interface contents grouping";
    leaf enabled {
      type boolean;
      description
        "'true' if mpls encapsulation is enabled on the
         interface. 'false' if mpls encapsulation is enabled
         on the interface.";
    }
    leaf mtu {
      type uint32;
      description
        "MPLS Maximum Transmission Unit (MTU) in bytes";
    }
  }

  grouping interfaces-mpls {
    description "List of MPLS interfaces";
    list interface {
      key "name";
      description "List of MPLS interfaces";
      leaf name {
        type if:interface-ref;
        description
          "The name of a configured MPLS interface";
      }
      uses interface-mpls-properties;
    }
  }

  grouping label-block-properties {
    description "Label-block configuration items";
    leaf index {
      type string;
      description
        "A user-specified identifier utilised to uniquely
         reference an MPLS label block";
    }
    leaf start-label {
      type rt-types:mpls-label;
      description "Label-block start";
    }
    leaf end-label {
      type rt-types:mpls-label;
      description "Label-block end";
    }
    leaf block-allocation-mode {
      type identityref {
        base label-block-alloc-mode;
      }
      description "Label-block allocation mode";
    }
  }

  grouping label-block_state {
    description "Label-block state items";
    leaf free-labels-count {
      when "../../block-allocation-mode = " +
      "'label-block-alloc-mode-manager'";
      type uint32;
      description "Label-block free labels count";
    }
    leaf inuse-labels-count {
      when "../../block-allocation-mode = " +
      "'label-block-alloc-mode-manager'";
      type uint32;
      description "Label-block inuse labels count";
    }
  }

  grouping globals {
    description "MPLS global configuration grouping";
    leaf ttl-propagate {
      type boolean;
      default 'true';
      description "Propagate TTL between IP and MPLS";
    }
  }
  grouping label-blocks {
    description "Label-block allocation grouping";
    container label-blocks {
      description "Label-block allocation container";
      list label-block {
        must "start-label >= end-label" {
          error-message "start-label can not be less than end-label";
        }
        key index;
        unique "start-label end-label";
        description "List of MPLS label-blocks";
        uses label-block-properties;
        container state {
          config false;
          description "Holds state information";
          uses label-block_state;
        }
      }
    }
  }

  augment "/rt:routing" {
    description "MPLS augmentation.";
    container mpls {
      description
        "MPLS container, to be used as an augmentation target node
         other MPLS sub-features config, e.g. MPLS static LSP, MPLS
         LDP LSPs, and Trafic Engineering MPLS LSP Tunnels, etc.";
        uses globals;
        uses label-blocks;
        uses interfaces-mpls;
    }
  }

  /* MPLS routes augmentation */
  augment "/rt:routing/rt:ribs/rt:rib/rt:routes/rt:route" {
    description
      "This is augmentation for all MPLS routes.";
    leaf mpls-enabled {
      type boolean;
      default 'false';
      description
        "Indicates whether MPLS is enabled for this route";
    }
    leaf local-label {
      when "../mpls-enabled = 'true'";
      type rt-types:mpls-label;
      description "MPLS local label associated with the route.";
    }
  }

  /* MPLS simple-next-hop augmentation */
  augment "/rt:routing/rt:ribs/rt:rib/rt:routes/rt:route/"
        + "rt:next-hop/rt:next-hop-options/rt:simple-next-hop" {
    description
      "Augment 'simple-next-hop' case in IP unicast routes.";
    uses nhlfe-single-contents {
      when "/rt:routing/rt:ribs/rt:rib/rt:routes/rt:route" +
      "/mpls:mpls-enabled = 'true'";
    }
  }

  /* MPLS next-hop-list augmentation */
  augment "/rt:routing/rt:ribs/rt:rib/rt:routes/rt:route/"
        + "rt:next-hop/rt:next-hop-options/rt:next-hop-list/"
        + "rt:next-hop-list/rt:next-hop" {
    description
      "This leaf augments the 'next-hop-list' case of IP unicast
       routes.";
    uses nhlfe-multiple-contents {
      when "/rt:routing/rt:ribs/rt:rib/rt:routes/rt:route" +
      "/mpls:mpls-enabled = 'true'";
    }
  }

  /* MPLS RPC input augmentation */
  augment
    "/rt:routing/rt:ribs/rt:rib/rt:active-route/rt:input" {
    description
      "This augment adds the input parameter of the 'active-route'
       action.";
    leaf local-label {
      type rt-types:mpls-label;
      description
        "MPLS local label.";
    }
  }

  /* MPLS RPC output augmentation */
  augment "/rt:routing/rt:ribs/rt:rib/rt:active-route/"
        + "rt:output/rt:route/"
        + "rt:next-hop/rt:next-hop-options/rt:simple-next-hop" {
    description
      "This augment adds the destination prefix to the reply of the
       'active-route' action.";
    uses nhlfe-single-contents;
  }
  augment "/rt:routing/rt:ribs/rt:rib/rt:active-route/"
        + "rt:output/rt:route/"
        + "rt:next-hop/rt:next-hop-options/rt:next-hop-list/"
        + "rt:next-hop-list/rt:next-hop" {
    description
      "This augment adds the destination prefix to the reply of the
       'active-route' action.";
    uses nhlfe-multiple-contents;
  }
}