module ietf-routing {

    yang-version 1.1;

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

    prefix rt;

    import ietf-yang-types {
      prefix yang;
    }
    import ietf-interfaces {
      prefix if;
      description
        "An 'ietf-interfaces' module version that is compatible with
the Network Management Datastore Architecture (NMDA)
is required.";
    }

    organization
      "IETF NETMOD (Network Modeling) Working Group";

    contact
      "WG Web:   <https://datatracker.ietf.org/wg/netmod/>
WG List:  <mailto:rtgwg@ietf.org>

Editor:   Ladislav Lhotka
	  <mailto:lhotka@nic.cz>
	  Acee Lindem
	  <mailto:acee@cisco.com>
	  Yingzhen Qu
	  <mailto:yingzhen.qu@huawei.com>";

    description
      "This YANG module defines essential components for the management
of a routing 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 8349; see
the RFC itself for full legal notices.";

    revision "2018-03-13" {
      description
        "Network Management Datastore Architecture (NMDA) revision.";
      reference
        "RFC 8349: A YANG Data Model for Routing Management
        	  (NMDA Version)";

    }

    revision "2016-11-04" {
      description "Initial revision.";
      reference
        "RFC 8022: A YANG Data Model for Routing Management";

    }


    feature multiple-ribs {
      description
        "This feature indicates that the server supports
user-defined RIBs.

Servers that do not advertise this feature SHOULD provide
exactly one system-controlled RIB per supported address family
and also make it the default RIB.  This RIB then appears as an
entry in the list '/routing/ribs/rib'.";
    }

    feature router-id {
      description
        "This feature indicates that the server supports an explicit
32-bit router ID that is used by some routing protocols.

Servers that do not advertise this feature set a router ID
algorithmically, usually to one of the configured IPv4
addresses.  However, this algorithm is implementation
specific.";
    }

    identity address-family {
      description
        "Base identity from which identities describing address
families are derived.";
    }

    identity ipv4 {
      base address-family;
      description
        "This identity represents an IPv4 address family.";
    }

    identity ipv6 {
      base address-family;
      description
        "This identity represents an IPv6 address family.";
    }

    identity control-plane-protocol {
      description
        "Base identity from which control-plane protocol identities are
derived.";
    }

    identity routing-protocol {
      base control-plane-protocol;
      description
        "Identity from which Layer 3 routing protocol identities are
derived.";
    }

    identity direct {
      base routing-protocol;
      description
        "Routing pseudo-protocol that provides routes to directly
connected networks.";
    }

    identity static {
      base routing-protocol;
      description
        "'Static' routing pseudo-protocol.";
    }

    typedef route-preference {
      type uint32;
      description
        "This type is used for route preferences.";
    }

    grouping address-family {
      description
        "This grouping provides a leaf identifying an address
family.";
      leaf address-family {
        type identityref {
          base address-family;
        }
        mandatory true;
        description "Address family.";
      }
    }  // grouping address-family

    grouping router-id {
      description
        "This grouping provides a router ID.";
      leaf router-id {
        type yang:dotted-quad;
        description
          "A 32-bit number in the form of a dotted quad that is used by
some routing protocols identifying a router.";
        reference
          "RFC 2328: OSPF Version 2";

      }
    }  // grouping router-id

    grouping special-next-hop {
      description
        "This grouping provides a leaf with an enumeration of special
next hops.";
      leaf special-next-hop {
        type enumeration {
          enum "blackhole" {
            value 0;
            description
              "Silently discard the packet.";
          }
          enum "unreachable" {
            value 1;
            description
              "Discard the packet and notify the sender with an error
message indicating that the destination host is
unreachable.";
          }
          enum "prohibit" {
            value 2;
            description
              "Discard the packet and notify the sender with an error
message indicating that the communication is
administratively prohibited.";
          }
          enum "receive" {
            value 3;
            description
              "The packet will be received by the local system.";
          }
        }
        description
          "Options for special next hops.";
      }
    }  // grouping special-next-hop

    grouping next-hop-content {
      description
        "Generic parameters of next hops in static routes.";
      choice next-hop-options {
        mandatory true;
        description
          "Options for next hops in static routes.

It is expected that further cases will be added through
augments from other modules.";
        case simple-next-hop {
          description
            "This case represents a simple next hop consisting of the
next-hop address and/or outgoing interface.

Modules for address families MUST augment this case with a
leaf containing a next-hop address of that address
family.";
          leaf outgoing-interface {
            type if:interface-ref;
            description
              "Name of the outgoing interface.";
          }
        }  // case simple-next-hop

        case special-next-hop {
          uses special-next-hop;
        }  // case special-next-hop
        container next-hop-list {
          description
            "Container for multiple next hops.";
          list next-hop {
            key "index";
            description
              "An entry in a next-hop list.

Modules for address families MUST augment this list
with a leaf containing a next-hop address of that
address family.";
            leaf index {
              type string;
              description
                "A user-specified identifier utilized 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 outgoing-interface {
              type if:interface-ref;
              description
                "Name of the outgoing interface.";
            }
          }  // list next-hop
        }  // container next-hop-list
      }  // choice next-hop-options
    }  // grouping next-hop-content

    grouping next-hop-state-content {
      description
        "Generic state parameters of next hops.";
      choice next-hop-options {
        mandatory true;
        description
          "Options for next hops.

It is expected that further cases will be added through
augments from other modules, e.g., for recursive
next hops.";
        case simple-next-hop {
          description
            "This case represents a simple next hop consisting of the
next-hop address and/or outgoing interface.

Modules for address families MUST augment this case with a
leaf containing a next-hop address of that address
family.";
          leaf outgoing-interface {
            type if:interface-ref;
            description
              "Name of the outgoing interface.";
          }
        }  // case simple-next-hop

        case special-next-hop {
          uses special-next-hop;
        }  // case special-next-hop
        container next-hop-list {
          description
            "Container for multiple next hops.";
          list next-hop {
            description
              "An entry in a next-hop list.

Modules for address families MUST augment this list
with a leaf containing a next-hop address of that
address family.";
            leaf outgoing-interface {
              type if:interface-ref;
              description
                "Name of the outgoing interface.";
            }
          }  // list next-hop
        }  // container next-hop-list
      }  // choice next-hop-options
    }  // grouping next-hop-state-content

    grouping route-metadata {
      description "Common route metadata.";
      leaf source-protocol {
        type identityref {
          base routing-protocol;
        }
        mandatory true;
        description
          "Type of the routing protocol from which the route
originated.";
      }

      leaf active {
        type empty;
        description
          "The presence of this leaf indicates that the route is
preferred among all routes in the same RIB that have the
same destination prefix.";
      }

      leaf last-updated {
        type yang:date-and-time;
        description
          "Timestamp of the last modification of the route.  If the
route was never modified, it is the time when the route was
inserted into the RIB.";
      }
    }  // grouping route-metadata

    container routing {
      description
        "Configuration parameters for the routing subsystem.";
      uses router-id {
        if-feature router-id;
        description
          "Support for the global router ID.  Routing protocols
that use a router ID can use this parameter or override it
with another value.";
      }

      container interfaces {
        config false;
        description
          "Network-layer interfaces used for routing.";
        leaf-list interface {
          type if:interface-ref;
          description
            "Each entry is a reference to the name of a configured
network-layer interface.";
        }
      }  // container interfaces

      container control-plane-protocols {
        description
          "Support for control-plane protocol instances.";
        list control-plane-protocol {
          key "type name";
          description
            "Each entry contains a control-plane protocol instance.";
          leaf type {
            type identityref {
              base control-plane-protocol;
            }
            description
              "Type of the control-plane protocol -- an identity
derived from the 'control-plane-protocol'
base identity.";
          }

          leaf name {
            type string;
            description
              "An arbitrary name of the control-plane protocol
instance.";
          }

          leaf description {
            type string;
            description
              "Textual description of the control-plane protocol
instance.";
          }

          container static-routes {
            when
              "derived-from-or-self(../type, 'rt:static')" {
              description
                "This container is only valid for the 'static' routing
protocol.";
            }
            description
              "Support for the 'static' pseudo-protocol.

Address-family-specific modules augment this node with
their lists of routes.";
          }  // container static-routes
        }  // list control-plane-protocol
      }  // container control-plane-protocols

      container ribs {
        description "Support for RIBs.";
        list rib {
          key "name";
          description
            "Each entry contains a configuration for a RIB identified
by the 'name' key.

Entries having the same key as a system-controlled entry
in the list '/routing/ribs/rib' are used for
configuring parameters of that entry.  Other entries
define additional user-controlled RIBs.";
          leaf name {
            type string;
            description
              "The name of the RIB.

For system-controlled entries, the value of this leaf
must be the same as the name of the corresponding entry
in the operational state.

For user-controlled entries, an arbitrary name can be
used.";
          }

          uses address-family {
            description
              "The address family of the system-controlled RIB.";
          }

          leaf default-rib {
            if-feature multiple-ribs;
            type boolean;
            default "true";
            config false;
            description
              "This flag has the value of 'true' if and only if the RIB
is the default RIB for the given address family.

By default, control-plane protocols place their routes
in the default RIBs.";
          }

          container routes {
            config false;
            description
              "Current contents of the RIB.";
            list route {
              description
                "A RIB route entry.  This data node MUST be augmented
with information specific to routes of each address
family.";
              leaf route-preference {
                type route-preference;
                description
                  "This route attribute, also known as 'administrative
distance', allows for selecting the preferred route
among routes with the same destination prefix.  A
smaller value indicates a route that is
more preferred.";
              }

              container next-hop {
                description
                  "Route's next-hop attribute.";
                uses next-hop-state-content;
              }  // container next-hop

              uses route-metadata;
            }  // list route
          }  // container routes

          action active-route {
            description
              "Return the active RIB route that is used for the
destination address.

Address-family-specific modules MUST augment input
parameters with a leaf named 'destination-address'.";
            output {
              container route {
                description
                  "The active RIB route for the specified destination.

If no route exists in the RIB for the destination
address, no output is returned.

Address-family-specific modules MUST augment this
container with appropriate route contents.";
                container next-hop {
                  description
                    "Route's next-hop attribute.";
                  uses next-hop-state-content;
                }  // container next-hop

                uses route-metadata;
              }  // container route
            }
          }  // rpc active-route

          leaf description {
            type string;
            description
              "Textual description of the RIB.";
          }
        }  // list rib
      }  // container ribs
    }  // container routing

    container routing-state {
      config false;
      status obsolete;
      description
        "State data of the routing subsystem.";
      uses router-id {
        status obsolete;
        description
          "Global router ID.

It may be either configured or assigned algorithmically by
the implementation.";
      }

      container interfaces {
        status obsolete;
        description
          "Network-layer interfaces used for routing.";
        leaf-list interface {
          type if:interface-state-ref;
          status obsolete;
          description
            "Each entry is a reference to the name of a configured
network-layer interface.";
        }
      }  // container interfaces

      container control-plane-protocols {
        status obsolete;
        description
          "Container for the list of routing protocol instances.";
        list control-plane-protocol {
          key "type name";
          status obsolete;
          description
            "State data of a control-plane protocol instance.

An implementation MUST provide exactly one
system-controlled instance of the 'direct'
pseudo-protocol.  Instances of other control-plane
protocols MAY be created by configuration.";
          leaf type {
            type identityref {
              base control-plane-protocol;
            }
            status obsolete;
            description
              "Type of the control-plane protocol.";
          }

          leaf name {
            type string;
            status obsolete;
            description
              "The name of the control-plane protocol instance.

For system-controlled instances, this name is
persistent, i.e., it SHOULD NOT change across
reboots.";
          }
        }  // list control-plane-protocol
      }  // container control-plane-protocols

      container ribs {
        status obsolete;
        description "Container for RIBs.";
        list rib {
          key "name";
          min-elements 1;
          status obsolete;
          description
            "Each entry represents a RIB identified by the 'name'
key.  All routes in a RIB MUST belong to the same address
family.

An implementation SHOULD provide one system-controlled
default RIB for each supported address family.";
          leaf name {
            type string;
            status obsolete;
            description
              "The name of the RIB.";
          }

          uses address-family {
            status obsolete;
            description
              "The address family of the RIB.";
          }

          leaf default-rib {
            if-feature multiple-ribs;
            type boolean;
            default "true";
            status obsolete;
            description
              "This flag has the value of 'true' if and only if the
RIB is the default RIB for the given address family.

By default, control-plane protocols place their routes
in the default RIBs.";
          }

          container routes {
            status obsolete;
            description
              "Current contents of the RIB.";
            list route {
              status obsolete;
              description
                "A RIB route entry.  This data node MUST be augmented
with information specific to routes of each address
family.";
              leaf route-preference {
                type route-preference;
                status obsolete;
                description
                  "This route attribute, also known as 'administrative
distance', allows for selecting the preferred route
among routes with the same destination prefix.  A
smaller value indicates a route that is
more preferred.";
              }

              container next-hop {
                status obsolete;
                description
                  "Route's next-hop attribute.";
                uses next-hop-state-content {
                  status obsolete;
                  description
                    "Route's next-hop attribute operational state.";
                }
              }  // container next-hop

              uses route-metadata {
                status obsolete;
                description
                  "Route metadata.";
              }
            }  // list route
          }  // container routes

          action active-route {
            status obsolete;
            description
              "Return the active RIB route that is used for the
destination address.

Address-family-specific modules MUST augment input
parameters with a leaf named 'destination-address'.";
            output {
              container route {
                status obsolete;
                description
                  "The active RIB route for the specified
destination.

If no route exists in the RIB for the destination
address, no output is returned.

Address-family-specific modules MUST augment this
container with appropriate route contents.";
                container next-hop {
                  status obsolete;
                  description
                    "Route's next-hop attribute.";
                  uses next-hop-state-content {
                    status obsolete;
                    description
                      "Active route state data.";
                  }
                }  // container next-hop

                uses route-metadata {
                  status obsolete;
                  description
                    "Active route metadata.";
                }
              }  // container route
            }

            input {
            }
          }  // rpc active-route
        }  // list rib
      }  // container ribs
    }  // container routing-state
  }  // module ietf-routing