module openconfig-segment-routing-types {

    yang-version 1;

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

    prefix oc-srt;

    import openconfig-extensions {
      prefix oc-ext;
    }
    import openconfig-mpls-types {
      prefix oc-mplst;
    }
    import openconfig-inet-types {
      prefix oc-inet;
    }

    organization "OpenConfig working group";

    contact
      "OpenConfig working group
www.openconfig.net";

    description
      "Types associated with a network instance";

    revision "2020-02-04" {
      description
        "Consistent prefix for openconfig-mpls-types.";
      reference
        "0.2.0";

    }

    revision "2019-09-24" {
      description
        "Initial revision of the SR types.";
      reference
        "0.1.0";

    }

    oc-ext:openconfig-version "0.2.0";

    typedef sr-dataplane-type {
      type enumeration {
        enum "MPLS" {
          value 0;
          description
            "The entity uses MPLS labels as Segment Identifiers.";
        }
        enum "IPV6" {
          value 1;
          description
            "The entity uses IPv6 prefixes as Segment Identifiers.";
        }
      }
      description
        "Types of data plane that can be used to instantiate a Segment
Routing block of SIDs.";
    }

    typedef sr-sid-type {
      type union {
        type oc-mplst:mpls-label;
        type oc-inet:ipv6-address;
      }
      description
        "The defined value of a segment identifier.";
    }

    typedef srte-protocol-type {
      type enumeration {
        enum "PCEP" {
          value 10;
          description
            "Path Computation Element Protocol.";
        }
        enum "BGP" {
          value 20;
          description "BGP SR policy.";
        }
        enum "CONFIG" {
          value 30;
          description "Local configuration.";
        }
      }
      description
        "The component or protocol that originates or signals the
candidate path.";
      reference
        "Section 2.3 of draft-ietf-spring-segment-routing-policy.";

    }

    typedef srte-endpoint-type {
      type oc-inet:ip-address;
      description
        "SR-TE endpoint is the policy destination which can be either an
IPv4 or IPv6 address.";
      reference
        "draft-ietf-spring-segment-routing-policy";

    }

    typedef srte-invalid-sl-reason {
      type enumeration {
        enum "EMPTY_SL" {
          value 0;
          description
            "Segment-list is empty.";
        }
        enum "ZERO_WEIGHT" {
          value 1;
          description
            "Segment-list weight is 0.";
        }
        enum "FIRST_SID_UNRESOLVABLE" {
          value 2;
          description
            "The headend is unable to perform path resolution for the
first SID into one or more outgoing interface(s) and
next-hop(s).";
        }
        enum "OTHER_SID_UNRESOLVABLE" {
          value 3;
          description
            "The headend is unable to perform SID resolution for any
non-first SID of type 3-through-11 into an MPLS label or
an SRv6 SID.";
        }
        enum "VERIFICATION_FAIL" {
          value 4;
          description
            "The headend verification fails for any SID for which
verification has been explicitly requested.";
        }
      }
      description
        "The list of segment-list invalid reasons.";
      reference
        "draft-ietf-spring-segment-routing-policy";

    }

    typedef enlp-type {
      type enumeration {
        enum "PUSH_IPV4_EXPLICIT_NULL" {
          value 0;
          description
            "Push an IPv4 Explicit NULL label on an unlabeled IPv4
packet but not IPv6 one.";
        }
        enum "PUSH_IPV6_EXPLICIT_NULL" {
          value 1;
          description
            "Push an IPv6 Explicit NULL label on an unlabeled IPv4
packet but not IPv4 one.";
        }
        enum "PUSH_IPV46_EXPLICIT_NULL" {
          value 2;
          description
            "Push an IPv4 Explicit NULL label on both unlabeled IPv4
packet and IPv6 packet.";
        }
        enum "NO_EXPLICIT_NULL" {
          value 3;
          description
            "Do not push an Explicit NULL label.";
        }
      }
      description
        "The list of possible ENLP(Explicit NULL Label Policy) values.";
      reference
        "draft-ietf-idr-segment-routing-te-policy";

    }
  }  // module openconfig-segment-routing-types