module openconfig-aft-types {

    yang-version 1;

    namespace
      "http://openconfig.net/yang/fib-types";

    prefix oc-aftt;

    import openconfig-extensions {
      prefix oc-ext;
    }

    organization "OpenConfig Working Group";

    contact
      "OpenConfig Working Group
    www.openconfig.net";

    description
      "Types related to the OpenConfig Abstract Forwarding
    Table (AFT) model";

    revision "2017-01-13" {
      description
        "Updated revision for external review";
      reference
        "0.2.1";

    }

    revision "2016-09-07" {
      description
        "Initial revision for external review";
      reference
        "0.2.0";

    }

    oc-ext:openconfig-version "0.2.1";

    typedef encapsulation-header-type {
      type enumeration {
        enum "GRE" {
          value 0;
          description
            "The encapsulation header is a Generic Routing Encapsulation
          header.";
        }
        enum "IPV4" {
          value 1;
          description
            "The encapsulation header is an IPv4 packet header";
        }
        enum "IPV6" {
          value 2;
          description
            "The encapsulation header is an IPv6 packet header";
        }
        enum "MPLS" {
          value 3;
          description
            "The encapsulation header is one or more MPLS labels indicated
          by the pushed and popped label stack lists.";
        }
      }
      description
        "Types of tunnel encapsulation that are supported by systems as either
      head- or tail-end.";
    }

    identity AFT_ADDRESS_FAMILY {
      description
        "A base identity that is used for address families that have
      distinct Abstract Forwarding Tables (AFTs).";
    }

    identity IPV4_UNICAST {
      base AFT_ADDRESS_FAMILY;
      description
        "The AFT entries within the corresponding table relate to unicast
      IPv4 forwarding entries.";
    }

    identity IPV6_UNICAST {
      base AFT_ADDRESS_FAMILY;
      description
        "The AFT entries within the corresponding table relate to unicast
      IPv6 forwarding entries.";
    }

    identity MPLS {
      base AFT_ADDRESS_FAMILY;
      description
        "The AFT entries within the corresponding table relate to labelled
      forwarding entries using MPLS labels.";
    }

    identity L2_ETHERNET {
      base AFT_ADDRESS_FAMILY;
      description
        "The AFT entries within the corresponding table relate to Ethernet
      switched forwarding entries.";
    }
  }  // module openconfig-aft-types