ietf-mpls.yang

module ietf-mpls {

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

  prefix "mpls";

  import ietf-routing {
    prefix "rt";
  }

  import ietf-interfaces {
    prefix "if";
  }

  import ietf-routing-types {
    prefix "rt-types";
  }

  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: Ross Callon
               <mailto:rcallon@juniper.net>

     WG Chair: George Swallow
               <mailto:swallow.ietf@gmail.com>

     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>

     Editor:   Himanshu Shah
               <mailto:hshah@ciena.com>

     Editor:   Igor Bryskin
               <mailto: Igor.Bryskin@huawei.com>

     Editor:   Xia Chen
               <mailto:jescia.chenxia@huawei.com>

     Editor:   Raqib Jones
               <mailto:raqib@Brocade.com>

     Editor:   Bin Wen
               <mailto:Bin_Wen@cable.comcast.com>";

  description
    "This YANG module defines the essential components for the
     management of the MPLS subsystem.";

  revision "2017-03-11" {
    description
      "Latest revision:
        - Addressed MPLS-RT review comments";
    reference "RFC 3031: 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";
  }

  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-simple-contents {
    description
      "MPLS simple NHLFE contents";
    leaf-list remote-labels {
      type rt-types:mpls-label;
      description "The MPLS label stack";
    }
  }

  grouping nhlfe-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-simple-contents;
  }

  grouping interface-mpls_config {
    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)";
    }
  }

  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";
      }
      container config {
        description "Holds intended configuration";
        uses interface-mpls_config;
      }
      container state {
        config false;
        description "Holds inuse configuration";
        uses interface-mpls_config;
      }
    }
  }

  grouping label-block_config {
    description "Label-block configuration items";
    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 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_config {
    description "MPLS global configuration leafs grouping";
    leaf ttl-propagate {
      type boolean;
      default 'true';
      description "Propagate TTL between IP and MPLS";
    }
  }

  grouping globals {
    description "MPLS global configuration grouping";
    container config {
      description "Holds intended configuration";
      uses globals_config;
    }
    container state {
      config false;
      description "Holds inuse configuration";
      uses globals_config;
    }
  }
  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";
        leaf index {
          type leafref {
            path "../config/index";
          }
          description "Label-block index";
        }
        leaf start-label {
          type leafref {
            path "../config/start-label";
          }
          description
            "Label-block start label reference";
        }
        leaf end-label {
          type leafref {
            path "../config/end-label";
          }
          description
            "Label-block end label reference";
        }
        description "List of MPLS label-blocks";
        container config {
          description "Holds intended configuration";
          uses label-block_config;
        }
        container state {
          config false;
          description "Holds inuse configuration";
          uses label-block_config;
          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;
    }
  }

  /* State data */
  augment "/rt:routing-state/rt:ribs/rt:rib/rt:routes/rt:route" {
    description
      "This leaf augments an IPv4 unicast route.";
    leaf local-label {
      type rt-types:mpls-label;
      description
        "MPLS local label.";
    }
  }

  augment "/rt:routing-state/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 IPv4 unicast routes.";
    uses nhlfe-simple-contents;
  }

  augment "/rt:routing-state/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 IPv4 unicast
       routes.";
    uses nhlfe-contents;
  }

  augment
    "/rt:routing-state/rt:ribs/rt:rib/rt:active-route/rt:input" {
    description
      "This augment adds the input parameter of the 'active-route'
       action.";
    uses nhlfe-contents;
  }

  augment "/rt:routing-state/rt:ribs/rt:rib/rt:active-route/"
        + "rt:output/rt:route" {
    description
      "This augment adds the destination prefix to the reply of the
       'active-route' action.";
    uses nhlfe-contents;
  }
}