ietf-interfaces

This module contains a collection of YANG definitions for managing network interfaces. Copyright (c) 2014 IETF Trust and the pe...

  • Version: 2014-05-08

    ietf-interfaces@2014-05-08


    
      module ietf-interfaces {
    
        yang-version 1;
    
        namespace
          "urn:ietf:params:xml:ns:yang:ietf-interfaces";
    
        prefix if;
    
        import ietf-yang-types {
          prefix yang;
        }
    
        organization
          "IETF NETMOD (NETCONF Data Modeling Language) Working Group";
    
        contact
          "WG Web:   <http://tools.ietf.org/wg/netmod/>
    WG List:  <mailto:netmod@ietf.org>
    
    WG Chair: Thomas Nadeau
    	  <mailto:tnadeau@lucidvision.com>
    
    WG Chair: Juergen Schoenwaelder
    	  <mailto:j.schoenwaelder@jacobs-university.de>
    
    Editor:   Martin Bjorklund
    	  <mailto:mbj@tail-f.com>";
    
        description
          "This module contains a collection of YANG definitions for
    managing network interfaces.
    
    Copyright (c) 2014 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
    (http://trustee.ietf.org/license-info).
    
    This version of this YANG module is part of RFC 7223; see
    the RFC itself for full legal notices.";
    
        revision "2014-05-08" {
          description "Initial revision.";
          reference
            "RFC 7223: A YANG Data Model for Interface Management";
    
        }
    
    
        typedef interface-ref {
          type leafref {
            path "/if:interfaces/if:interface/if:name";
          }
          description
            "This type is used by data models that need to reference
    configured interfaces.";
        }
    
        typedef interface-state-ref {
          type leafref {
            path "/if:interfaces-state/if:interface/if:name";
          }
          description
            "This type is used by data models that need to reference
    the operationally present interfaces.";
        }
    
        identity interface-type {
          description
            "Base identity from which specific interface types are
    derived.";
        }
    
        feature arbitrary-names {
          description
            "This feature indicates that the device allows user-controlled
    interfaces to be named arbitrarily.";
        }
    
        feature pre-provisioning {
          description
            "This feature indicates that the device supports
    pre-provisioning of interface configuration, i.e., it is
    possible to configure an interface whose physical interface
    hardware is not present on the device.";
        }
    
        feature if-mib {
          description
            "This feature indicates that the device implements
    the IF-MIB.";
          reference
            "RFC 2863: The Interfaces Group MIB";
    
        }
    
        container interfaces {
          description
            "Interface configuration parameters.";
          list interface {
            key "name";
            description
              "The list of configured interfaces on the device.
    
    The operational state of an interface is available in the
    /interfaces-state/interface list.  If the configuration of a
    system-controlled interface cannot be used by the system
    (e.g., the interface hardware present does not match the
    interface type), then the configuration is not applied to
    the system-controlled interface shown in the
    /interfaces-state/interface list.  If the configuration
    of a user-controlled interface cannot be used by the system,
    the configured interface is not instantiated in the
    /interfaces-state/interface list.";
            leaf name {
              type string;
              description
                "The name of the interface.
    
    A device MAY restrict the allowed values for this leaf,
    possibly depending on the type of the interface.
    For system-controlled interfaces, this leaf is the
    device-specific name of the interface.  The 'config false'
    list /interfaces-state/interface contains the currently
    existing interfaces on the device.
    
    If a client tries to create configuration for a
    system-controlled interface that is not present in the
    /interfaces-state/interface list, the server MAY reject
    the request if the implementation does not support
    pre-provisioning of interfaces or if the name refers to
    an interface that can never exist in the system.  A
    NETCONF server MUST reply with an rpc-error with the
    error-tag 'invalid-value' in this case.
    
    If the device supports pre-provisioning of interface
    configuration, the 'pre-provisioning' feature is
    advertised.
    
    If the device allows arbitrarily named user-controlled
    interfaces, the 'arbitrary-names' feature is advertised.
    
    When a configured user-controlled interface is created by
    the system, it is instantiated with the same name in the
    /interface-state/interface list.";
            }
    
            leaf description {
              type string;
              description
                "A textual description of the interface.
    
    A server implementation MAY map this leaf to the ifAlias
    MIB object.  Such an implementation needs to use some
    mechanism to handle the differences in size and characters
    allowed between this leaf and ifAlias.  The definition of
    such a mechanism is outside the scope of this document.
    
    Since ifAlias is defined to be stored in non-volatile
    storage, the MIB implementation MUST map ifAlias to the
    value of 'description' in the persistently stored
    datastore.
    
    Specifically, if the device supports ':startup', when
    ifAlias is read the device MUST return the value of
    'description' in the 'startup' datastore, and when it is
    written, it MUST be written to the 'running' and 'startup'
    datastores.  Note that it is up to the implementation to
    
    decide whether to modify this single leaf in 'startup' or
    perform an implicit copy-config from 'running' to
    'startup'.
    
    If the device does not support ':startup', ifAlias MUST
    be mapped to the 'description' leaf in the 'running'
    datastore.";
              reference
                "RFC 2863: The Interfaces Group MIB - ifAlias";
    
            }
    
            leaf type {
              type identityref {
                base interface-type;
              }
              mandatory true;
              description
                "The type of the interface.
    
    When an interface entry is created, a server MAY
    initialize the type leaf with a valid value, e.g., if it
    is possible to derive the type from the name of the
    interface.
    
    If a client tries to set the type of an interface to a
    value that can never be used by the system, e.g., if the
    type is not supported or if the type does not match the
    name of the interface, the server MUST reject the request.
    A NETCONF server MUST reply with an rpc-error with the
    error-tag 'invalid-value' in this case.";
              reference
                "RFC 2863: The Interfaces Group MIB - ifType";
    
            }
    
            leaf enabled {
              type boolean;
              default "true";
              description
                "This leaf contains the configured, desired state of the
    interface.
    
    Systems that implement the IF-MIB use the value of this
    leaf in the 'running' datastore to set
    IF-MIB.ifAdminStatus to 'up' or 'down' after an ifEntry
    has been initialized, as described in RFC 2863.
    
    
    
    Changes in this leaf in the 'running' datastore are
    reflected in ifAdminStatus, but if ifAdminStatus is
    changed over SNMP, this leaf is not affected.";
              reference
                "RFC 2863: The Interfaces Group MIB - ifAdminStatus";
    
            }
    
            leaf link-up-down-trap-enable {
              if-feature if-mib;
              type enumeration {
                enum "enabled" {
                  value 1;
                }
                enum "disabled" {
                  value 2;
                }
              }
              description
                "Controls whether linkUp/linkDown SNMP notifications
    should be generated for this interface.
    
    If this node is not configured, the value 'enabled' is
    operationally used by the server for interfaces that do
    not operate on top of any other interface (i.e., there are
    no 'lower-layer-if' entries), and 'disabled' otherwise.";
              reference
                "RFC 2863: The Interfaces Group MIB -
                	  ifLinkUpDownTrapEnable";
    
            }
    
            list diffserv-target-entry {
              key "direction policy-name";
              description
                "policy target for inbound or outbound direction";
              leaf direction {
                type identityref {
                  base direction;
                }
                description
                  "Direction fo the traffic flow either inbound or outbound";
              }
    
              leaf policy-name {
                type string;
                description "Policy entry name";
              }
    
              leaf service-policy-type {
                type identityref {
                  base policy-types:policy-type;
                }
                default "policy-types:qos";
                description
                  "Type of the service-policy";
              }
            }  // list diffserv-target-entry
    
            container ipv4 {
              presence
                "Enables IPv4 unless the 'enabled' leaf
    (which defaults to 'true') is set to 'false'";
              description
                "Parameters for the IPv4 address family.";
              leaf enabled {
                type boolean;
                default "true";
                description
                  "Controls whether IPv4 is enabled or disabled on this
    interface.  When IPv4 is enabled, this interface is
    connected to an IPv4 stack, and the interface can send
    and receive IPv4 packets.";
              }
    
              leaf forwarding {
                type boolean;
                default "false";
                description
                  "Controls IPv4 packet forwarding of datagrams received by,
    but not addressed to, this interface.  IPv4 routers
    forward datagrams.  IPv4 hosts do not (except those
    source-routed via the host).";
              }
    
              leaf mtu {
                type uint16 {
                  range "68..max";
                }
                units "octets";
                description
                  "The size, in octets, of the largest IPv4 packet that the
    interface will send and receive.
    The server may restrict the allowed values for this leaf,
    depending on the interface's type.
    If this leaf is not configured, the operationally used MTU
    depends on the interface's type.";
                reference
                  "RFC 791: Internet Protocol";
    
              }
    
              list address {
                key "ip";
                description
                  "The list of configured IPv4 addresses on the interface.";
                leaf ip {
                  type inet:ipv4-address-no-zone;
                  description
                    "The IPv4 address on the interface.";
                }
    
                choice subnet {
                  mandatory true;
                  description
                    "The subnet can be specified as a prefix-length, or,
    if the server supports non-contiguous netmasks, as
    a netmask.";
                  leaf prefix-length {
                    type uint8 {
                      range "0..32";
                    }
                    description
                      "The length of the subnet prefix.";
                  }
                  leaf netmask {
                    if-feature ipv4-non-contiguous-netmasks;
                    type yang:dotted-quad;
                    description
                      "The subnet specified as a netmask.";
                  }
                }  // choice subnet
              }  // list address
    
              list neighbor {
                key "ip";
                description
                  "A list of mappings from IPv4 addresses to
    link-layer addresses.
    Entries in this list are used as static entries in the
    ARP Cache.";
                reference
                  "RFC 826: An Ethernet Address Resolution Protocol";
    
                leaf ip {
                  type inet:ipv4-address-no-zone;
                  description
                    "The IPv4 address of the neighbor node.";
                }
    
                leaf link-layer-address {
                  type yang:phys-address;
                  mandatory true;
                  description
                    "The link-layer address of the neighbor node.";
                }
              }  // list neighbor
            }  // container ipv4
    
            container ipv6 {
              presence
                "Enables IPv6 unless the 'enabled' leaf
    (which defaults to 'true') is set to 'false'";
              description
                "Parameters for the IPv6 address family.";
              leaf enabled {
                type boolean;
                default "true";
                description
                  "Controls whether IPv6 is enabled or disabled on this
    interface.  When IPv6 is enabled, this interface is
    connected to an IPv6 stack, and the interface can send
    and receive IPv6 packets.";
              }
    
              leaf forwarding {
                type boolean;
                default "false";
                description
                  "Controls IPv6 packet forwarding of datagrams received by,
    but not addressed to, this interface.  IPv6 routers
    forward datagrams.  IPv6 hosts do not (except those
    source-routed via the host).";
                reference
                  "RFC 4861: Neighbor Discovery for IP version 6 (IPv6)
                  	  Section 6.2.1, IsRouter";
    
              }
    
              leaf mtu {
                type uint32 {
                  range "1280..max";
                }
                units "octets";
                description
                  "The size, in octets, of the largest IPv6 packet that the
    interface will send and receive.
    The server may restrict the allowed values for this leaf,
    depending on the interface's type.
    If this leaf is not configured, the operationally used MTU
    depends on the interface's type.";
                reference
                  "RFC 2460: Internet Protocol, Version 6 (IPv6) Specification
                  	  Section 5";
    
              }
    
              list address {
                key "ip";
                description
                  "The list of configured IPv6 addresses on the interface.";
                leaf ip {
                  type inet:ipv6-address-no-zone;
                  description
                    "The IPv6 address on the interface.";
                }
    
                leaf prefix-length {
                  type uint8 {
                    range "0..128";
                  }
                  mandatory true;
                  description
                    "The length of the subnet prefix.";
                }
              }  // list address
    
              list neighbor {
                key "ip";
                description
                  "A list of mappings from IPv6 addresses to
    link-layer addresses.
    Entries in this list are used as static entries in the
    Neighbor Cache.";
                reference
                  "RFC 4861: Neighbor Discovery for IP version 6 (IPv6)";
    
                leaf ip {
                  type inet:ipv6-address-no-zone;
                  description
                    "The IPv6 address of the neighbor node.";
                }
    
                leaf link-layer-address {
                  type yang:phys-address;
                  mandatory true;
                  description
                    "The link-layer address of the neighbor node.";
                }
              }  // list neighbor
    
              leaf dup-addr-detect-transmits {
                type uint32;
                default "1";
                description
                  "The number of consecutive Neighbor Solicitation messages
    sent while performing Duplicate Address Detection on a
    tentative address.  A value of zero indicates that
    Duplicate Address Detection is not performed on
    tentative addresses.  A value of one indicates a single
    transmission with no follow-up retransmissions.";
                reference
                  "RFC 4862: IPv6 Stateless Address Autoconfiguration";
    
              }
    
              container autoconf {
                description
                  "Parameters to control the autoconfiguration of IPv6
    addresses, as described in RFC 4862.";
                reference
                  "RFC 4862: IPv6 Stateless Address Autoconfiguration";
    
                leaf create-global-addresses {
                  type boolean;
                  default "true";
                  description
                    "If enabled, the host creates global addresses as
    described in RFC 4862.";
                  reference
                    "RFC 4862: IPv6 Stateless Address Autoconfiguration
                    	  Section 5.5";
    
                }
    
                leaf create-temporary-addresses {
                  if-feature ipv6-privacy-autoconf;
                  type boolean;
                  default "false";
                  description
                    "If enabled, the host creates temporary addresses as
    described in RFC 4941.";
                  reference
                    "RFC 4941: Privacy Extensions for Stateless Address
                    	  Autoconfiguration in IPv6";
    
                }
    
                leaf temporary-valid-lifetime {
                  if-feature ipv6-privacy-autoconf;
                  type uint32;
                  units "seconds";
                  default "604800";
                  description
                    "The time period during which the temporary address
    is valid.";
                  reference
                    "RFC 4941: Privacy Extensions for Stateless Address
                    	  Autoconfiguration in IPv6
                    	  - TEMP_VALID_LIFETIME";
    
                }
    
                leaf temporary-preferred-lifetime {
                  if-feature ipv6-privacy-autoconf;
                  type uint32;
                  units "seconds";
                  default "86400";
                  description
                    "The time period during which the temporary address is
    preferred.";
                  reference
                    "RFC 4941: Privacy Extensions for Stateless Address
                    	  Autoconfiguration in IPv6
                    	  - TEMP_PREFERRED_LIFETIME";
    
                }
              }  // container autoconf
    
              container ipv6-router-advertisements {
                description
                  "Configuration of IPv6 Router Advertisements.";
                leaf send-advertisements {
                  type boolean;
                  default "false";
                  description
                    "A flag indicating whether or not the router sends periodic
    Router Advertisements and responds to Router
    Solicitations.";
                  reference
                    "RFC 4861: Neighbor Discovery for IP version 6 (IPv6) -
                    AdvSendAdvertisements.";
    
                }
    
                leaf max-rtr-adv-interval {
                  type uint16 {
                    range "4..1800";
                  }
                  units "seconds";
                  default "600";
                  description
                    "The maximum time allowed between sending unsolicited
    multicast Router Advertisements from the interface.";
                  reference
                    "RFC 4861: Neighbor Discovery for IP version 6 (IPv6) -
                    MaxRtrAdvInterval.";
    
                }
    
                leaf min-rtr-adv-interval {
                  type uint16 {
                    range "3..1350";
                  }
                  units "seconds";
                  must
                    ". <= 0.75 * ../max-rtr-adv-interval" {
                    description
                      "The value MUST NOT be greater than 75 % of
    'max-rtr-adv-interval'.";
                  }
                  description
                    "The minimum time allowed between sending unsolicited
    multicast Router Advertisements from the interface.
    
    The default value to be used operationally if this leaf is
    not configured is determined as follows:
    
    - if max-rtr-adv-interval >= 9 seconds, the default value
      is 0.33 * max-rtr-adv-interval;
    
    - otherwise it is 0.75 * max-rtr-adv-interval.";
                  reference
                    "RFC 4861: Neighbor Discovery for IP version 6 (IPv6) -
                    MinRtrAdvInterval.";
    
                }
    
                leaf managed-flag {
                  type boolean;
                  default "false";
                  description
                    "The value to be placed in the 'Managed address
    configuration' flag field in the Router Advertisement.";
                  reference
                    "RFC 4861: Neighbor Discovery for IP version 6 (IPv6) -
                    AdvManagedFlag.";
    
                }
    
                leaf other-config-flag {
                  type boolean;
                  default "false";
                  description
                    "The value to be placed in the 'Other configuration' flag
    field in the Router Advertisement.";
                  reference
                    "RFC 4861: Neighbor Discovery for IP version 6 (IPv6) -
                    AdvOtherConfigFlag.";
    
                }
    
                leaf link-mtu {
                  type uint32;
                  default "0";
                  description
                    "The value to be placed in MTU options sent by the router.
    A value of zero indicates that no MTU options are sent.";
                  reference
                    "RFC 4861: Neighbor Discovery for IP version 6 (IPv6) -
                    AdvLinkMTU.";
    
                }
    
                leaf reachable-time {
                  type uint32 {
                    range "0..3600000";
                  }
                  units "milliseconds";
                  default "0";
                  description
                    "The value to be placed in the Reachable Time field in the
    Router Advertisement messages sent by the router. A value
    of zero means unspecified (by this router).";
                  reference
                    "RFC 4861: Neighbor Discovery for IP version 6 (IPv6) -
                    AdvReachableTime.";
    
                }
    
                leaf retrans-timer {
                  type uint32;
                  units "milliseconds";
                  default "0";
                  description
                    "The value to be placed in the Retrans Timer field in the
    Router Advertisement messages sent by the router. A value
    of zero means unspecified (by this router).";
                  reference
                    "RFC 4861: Neighbor Discovery for IP version 6 (IPv6) -
                    AdvRetransTimer.";
    
                }
    
                leaf cur-hop-limit {
                  type uint8;
                  description
                    "The value to be placed in the Cur Hop Limit field in the
    Router Advertisement messages sent by the router. A value
    of zero means unspecified (by this router).
    
    If this parameter is not configured, the device SHOULD use
    the value specified in IANA Assigned Numbers that was in
    effect at the time of implementation.";
                  reference
                    "RFC 4861: Neighbor Discovery for IP version 6 (IPv6) -
                    AdvCurHopLimit.
                    IANA: IP Parameters,
                    http://www.iana.org/assignments/ip-parameters";
    
                }
    
                leaf default-lifetime {
                  type uint16 {
                    range "0..9000";
                  }
                  units "seconds";
                  description
                    "The value to be placed in the Router Lifetime field of
    Router Advertisements sent from the interface, in seconds.
    It MUST be either zero or between max-rtr-adv-interval and
    9000 seconds. A value of zero indicates that the router is
    not to be used as a default router. These limits may be
    overridden by specific documents that describe how IPv6
    operates over different link layers.
    
    If this parameter is not configured, the device SHOULD use
    a value of 3 * max-rtr-adv-interval.";
                  reference
                    "RFC 4861: Neighbor Discovery for IP version 6 (IPv6) -
                    AdvDefaultLifeTime.";
    
                }
    
                container prefix-list {
                  description
                    "Configuration of prefixes to be placed in Prefix
    Information options in Router Advertisement messages sent
    from the interface.
    
    Prefixes that are advertised by default but do not have
    their entries in the child 'prefix' list are advertised
    with the default values of all parameters.
    
    The link-local prefix SHOULD NOT be included in the list
    of advertised prefixes.";
                  reference
                    "RFC 4861: Neighbor Discovery for IP version 6 (IPv6) -
                    AdvPrefixList.";
    
                  list prefix {
                    key "prefix-spec";
                    description
                      "Configuration of an advertised prefix entry.";
                    leaf prefix-spec {
                      type inet:ipv6-prefix;
                      description
                        "IPv6 address prefix.";
                    }
    
                    choice control-adv-prefixes {
                      default "advertise";
                      description
                        "The prefix either may be explicitly removed from the
    set of advertised prefixes, or parameters with which
    it is advertised may be specified (default case).";
                      leaf no-advertise {
                        type empty;
                        description
                          "The prefix will not be advertised.
    
    This can be used for removing the prefix from the
    default set of advertised prefixes.";
                      }
    
                      case advertise {
                        leaf valid-lifetime {
                          type uint32;
                          units "seconds";
                          default "2592000";
                          description
                            "The value to be placed in the Valid Lifetime in
    the Prefix Information option. The designated
    value of all 1's (0xffffffff) represents
    infinity.";
                          reference
                            "RFC 4861: Neighbor Discovery for IP version 6
                            (IPv6) - AdvValidLifetime.";
    
                        }
    
                        leaf on-link-flag {
                          type boolean;
                          default "true";
                          description
                            "The value to be placed in the on-link flag
    ('L-bit') field in the Prefix Information
    option.";
                          reference
                            "RFC 4861: Neighbor Discovery for IP version 6
                            (IPv6) - AdvOnLinkFlag.";
    
                        }
    
                        leaf preferred-lifetime {
                          type uint32;
                          units "seconds";
                          must
                            ". <= ../valid-lifetime" {
                            description
                              "This value MUST NOT be greater than
    valid-lifetime.";
                          }
                          default "604800";
                          description
                            "The value to be placed in the Preferred Lifetime
    in the Prefix Information option. The designated
    value of all 1's (0xffffffff) represents
    infinity.";
                          reference
                            "RFC 4861: Neighbor Discovery for IP version 6
                            (IPv6) - AdvPreferredLifetime.";
    
                        }
    
                        leaf autonomous-flag {
                          type boolean;
                          default "true";
                          description
                            "The value to be placed in the Autonomous Flag
    field in the Prefix Information option.";
                          reference
                            "RFC 4861: Neighbor Discovery for IP version 6
                            (IPv6) - AdvAutonomousFlag.";
    
                        }
                      }  // case advertise
                    }  // choice control-adv-prefixes
                  }  // list prefix
                }  // container prefix-list
              }  // container ipv6-router-advertisements
            }  // container ipv6
    
            container pw-neighbor {
              if-feature pw-interface;
              description
                "Pseudowire neighbor configurations.";
              leaf neighbor-ip-address {
                type inet:ip-address;
                description
                  "IPv4 or IPv6 address of the neighbor.";
              }
    
              leaf vc-id {
                type uint32 {
                  range "1..4294967295";
                }
                description "Pseudowire VC ID";
              }
    
              container static-label {
                description
                  "Statically configured labels, signalling should be none";
                leaf local-label {
                  type uint32 {
                    range "16..1048575";
                  }
                  description
                    "Local MPLS label ID";
                }
    
                leaf remote-label {
                  type uint32 {
                    range "16..1048575";
                  }
                  description
                    "Remote MPLS label ID";
                }
              }  // container static-label
    
              leaf source-template {
                type pw-template-ref;
                description
                  "Specify template for PW configuration";
              }
    
              leaf encapsulation {
                type identityref {
                  base pw-encapsulation-type;
                }
                description
                  "Encapsulation used for PW";
              }
    
              leaf control-word {
                when
                  "../encapsulation = 'pw-encap-mpls'" {
                  description
                    "Pseudowire encapsulation must be of mpls type to enable
    control word in MPLS pseudowire header.";
                }
                type boolean;
                description
                  "Use control word in the MPLS PW header.";
              }
    
              leaf signaling-protocol {
                type identityref {
                  base pw-signaling-protocol-type;
                }
                description
                  "Signaling protocol to use.";
              }
    
              container load-balance {
                if-feature pw-load-balancing;
                description
                  "Load balancing mechanism.";
                choice flow {
                  if-feature pw-class-flow-setting;
                  default "ethernet";
                  description
                    "Load-balancing options for a pseudowire.";
                  leaf ethernet {
                    type identityref {
                      base pw-lb-ethernet-type;
                    }
                    default
                      "pw-lb-eth-src-dst-mac";
                    description
                      "Ethernet mac address based load balancing";
                  }
                  leaf ip {
                    type identityref {
                      base pw-lb-ip-type;
                    }
                    description
                      "IP address based load balancing";
                  }
                }  // choice flow
    
                container flow-label {
                  description
                    "Enable Flow Aware Label (FAT) PW - the capability to
    carry flow label on PW";
                  leaf direction {
                    type enumeration {
                      enum "transmit" {
                        value 1;
                        description "TODO";
                      }
                      enum "receive" {
                        value 2;
                        description "TODO";
                      }
                      enum "both" {
                        value 3;
                        description "TODO";
                      }
                    }
                    description
                      "Directions to enable Flow Aware Label PW";
                  }
    
                  leaf tlv-code-17 {
                    if-feature flow-label-tlv-code17;
                    type boolean;
                    description
                      "Carry code 0x17 as Flow Aware Label (FAT) PW signalled
    sub-tlv id";
                  }
    
                  leaf static {
                    if-feature flow-label-static-config;
                    type boolean;
                    default "false";
                    description
                      "Use statically configured flow label on traffic
    flowing on the PW";
                  }
                }  // container flow-label
              }  // container load-balance
    
              container preferred-path {
                if-feature pw-preferred-path;
                description
                  "Preferred path for the PW";
                choice path {
                  description
                    "Choice of tunnel interface or peer";
                  leaf interface {
                    type interface-ref;
                    description
                      "Reference to a tunnel interface.";
                  }
    
                  case address {
                    if-feature preferred-path-peer;
                    leaf address {
                      type inet:ip-address;
                      description "TODO";
                    }
                  }  // case address
    
                  case hostname {
                    if-feature preferred-path-peer;
                    leaf hostname {
                      type string;
                      description "TODO";
                    }
                  }  // case hostname
                }  // choice path
    
                leaf disable-fallback {
                  type boolean;
                  description
                    "Disable fall back to alternative route";
                }
              }  // container preferred-path
    
              container sequencing {
                if-feature pw-sequencing;
                description "Sequencing options";
                leaf direction {
                  type identityref {
                    base pw-sequencing-type;
                  }
                  description "TODO";
                }
    
                leaf resync {
                  type int32 {
                    range "5..65535";
                  }
                  description "TODO";
                }
              }  // container sequencing
    
              leaf vc-type {
                type identityref {
                  base pw-vc-type;
                }
                description
                  "Type of VC in the PW.";
              }
    
              leaf switching-tlv {
                type boolean;
                description "Send switching TLV";
              }
    
              container vccv {
                if-feature pw-vccv;
                description "VCCV configuration";
                leaf control-word {
                  type boolean;
                  description
                    "Enable VCCV verification type";
                }
              }  // container vccv
    
              container switchover-delay {
                if-feature pw-class-switchover-delay;
                description
                  "Timer configuration related to pseudowire redundancy
    switchover and restoring to primary";
                leaf switchover-timer {
                  type uint8 {
                    range "0..120";
                  }
                  description
                    "Specifies how long the backup pseudowire should wait before
    taking over";
                }
    
                choice restore-timer-or-never {
                  description
                    "Restore timer configuration options.";
                  leaf timer {
                    type uint8 {
                      range "0..180";
                    }
                    description
                      "Specifies how long the primary pseudowire should wait
    after it becomes active to take over for the backup
    pseudowire";
                  }
                  leaf never {
                    type boolean;
                    default "false";
                    description
                      "The primary pseudowire never takes over for the backup";
                  }
                }  // choice restore-timer-or-never
              }  // container switchover-delay
    
              leaf source-ip {
                if-feature pw-class-source-ip;
                type inet:ipv4-address;
                description
                  "The local source IPv4 address";
              }
    
              leaf tag-rewrite-ingress-vlan {
                if-feature pw-class-tag-rewrite;
                type uint16 {
                  range "1..4094";
                }
                description
                  "Configure ingress tag rewrite vlan.";
              }
    
              leaf mac-withdraw {
                if-feature pw-mac-withdraw-config;
                type boolean;
                default "false";
                description
                  "Send Mac-withdraw message when PW becomes active.";
              }
    
              container status {
                description "TODO";
                leaf decoupled {
                  if-feature pw-class-status;
                  type boolean;
                  default "false";
                  description
                    "Reflect standby status of the attachment circuit as up on
    the pseudowire.";
                }
    
                leaf disable {
                  if-feature pw-class-status;
                  type boolean;
                  default "false";
                  description
                    "Do not send pseudowire status to peer.";
                }
    
                leaf peer-topo-dual-homed {
                  type boolean;
                  description
                    "Our peer(s) are participating in a redundant solution with
    some form of redundancy protocol running between the peer
    routers. Only one of the remote peers will advertise a
    status of UP at a time. The other will advertise standby.
    Change our configuration so we can send a status of UP on
    both active and redundant pseudowires.";
                }
    
                leaf route-watch-disable {
                  if-feature pw-class-status;
                  type boolean;
                  default "false";
                  description
                    "Disable listening for routing events to trigger redundancy
    status changes";
                }
    
                leaf redundancy-master {
                  if-feature pw-class-status;
                  type boolean;
                  default "false";
                  description
                    "Make the PE as master to enables Pseudowire Preferential
    Forwarding feature to display the status of  the active
    and backup pseudowires.";
                }
              }  // container status
            }  // container pw-neighbor
          }  // list interface
        }  // container interfaces
    
        container interfaces-state {
          config false;
          description
            "Data nodes for the operational state of interfaces.";
          list interface {
            key "name";
            description
              "The list of interfaces on the device.
    
    System-controlled interfaces created by the system are
    always present in this list, whether they are configured or
    not.";
            leaf name {
              type string;
              description
                "The name of the interface.
    
    A server implementation MAY map this leaf to the ifName
    MIB object.  Such an implementation needs to use some
    mechanism to handle the differences in size and characters
    allowed between this leaf and ifName.  The definition of
    such a mechanism is outside the scope of this document.";
              reference
                "RFC 2863: The Interfaces Group MIB - ifName";
    
            }
    
            leaf type {
              type identityref {
                base interface-type;
              }
              mandatory true;
              description
                "The type of the interface.";
              reference
                "RFC 2863: The Interfaces Group MIB - ifType";
    
            }
    
            leaf admin-status {
              if-feature if-mib;
              type enumeration {
                enum "up" {
                  value 1;
                  description
                    "Ready to pass packets.";
                }
                enum "down" {
                  value 2;
                  description
                    "Not ready to pass packets and not in some test mode.";
                }
                enum "testing" {
                  value 3;
                  description
                    "In some test mode.";
                }
              }
              mandatory true;
              description
                "The desired state of the interface.
    
    This leaf has the same read semantics as ifAdminStatus.";
              reference
                "RFC 2863: The Interfaces Group MIB - ifAdminStatus";
    
            }
    
            leaf oper-status {
              type enumeration {
                enum "up" {
                  value 1;
                  description
                    "Ready to pass packets.";
                }
                enum "down" {
                  value 2;
                  description
                    "The interface does not pass any packets.";
                }
                enum "testing" {
                  value 3;
                  description
                    "In some test mode.  No operational packets can
    be passed.";
                }
                enum "unknown" {
                  value 4;
                  description
                    "Status cannot be determined for some reason.";
                }
                enum "dormant" {
                  value 5;
                  description
                    "Waiting for some external event.";
                }
                enum "not-present" {
                  value 6;
                  description
                    "Some component (typically hardware) is missing.";
                }
                enum "lower-layer-down" {
                  value 7;
                  description
                    "Down due to state of lower-layer interface(s).";
                }
              }
              mandatory true;
              description
                "The current operational state of the interface.
    
    This leaf has the same semantics as ifOperStatus.";
              reference
                "RFC 2863: The Interfaces Group MIB - ifOperStatus";
    
            }
    
            leaf last-change {
              type yang:date-and-time;
              description
                "The time the interface entered its current operational
    state.  If the current state was entered prior to the
    last re-initialization of the local network management
    subsystem, then this node is not present.";
              reference
                "RFC 2863: The Interfaces Group MIB - ifLastChange";
    
            }
    
            leaf if-index {
              if-feature if-mib;
              type int32 {
                range "1..2147483647";
              }
              mandatory true;
              description
                "The ifIndex value for the ifEntry represented by this
    interface.";
              reference
                "RFC 2863: The Interfaces Group MIB - ifIndex";
    
            }
    
            leaf phys-address {
              type yang:phys-address;
              description
                "The interface's address at its protocol sub-layer.  For
    example, for an 802.x interface, this object normally
    contains a Media Access Control (MAC) address.  The
    interface's media-specific modules must define the bit
    
    
    and byte ordering and the format of the value of this
    object.  For interfaces that do not have such an address
    (e.g., a serial line), this node is not present.";
              reference
                "RFC 2863: The Interfaces Group MIB - ifPhysAddress";
    
            }
    
            leaf-list higher-layer-if {
              type interface-state-ref;
              description
                "A list of references to interfaces layered on top of this
    interface.";
              reference
                "RFC 2863: The Interfaces Group MIB - ifStackTable";
    
            }
    
            leaf-list lower-layer-if {
              type interface-state-ref;
              description
                "A list of references to interfaces layered underneath this
    interface.";
              reference
                "RFC 2863: The Interfaces Group MIB - ifStackTable";
    
            }
    
            leaf speed {
              type yang:gauge64;
              units "bits/second";
              description
                "An estimate of the interface's current bandwidth in bits
    per second.  For interfaces that do not vary in
    bandwidth or for those where no accurate estimation can
    be made, this node should contain the nominal bandwidth.
    For interfaces that have no concept of bandwidth, this
    node is not present.";
              reference
                "RFC 2863: The Interfaces Group MIB -
                	  ifSpeed, ifHighSpeed";
    
            }
    
            container statistics {
              description
                "A collection of interface-related statistics objects.";
              leaf discontinuity-time {
                type yang:date-and-time;
                mandatory true;
                description
                  "The time on the most recent occasion at which any one or
    more of this interface's counters suffered a
    discontinuity.  If no such discontinuities have occurred
    since the last re-initialization of the local management
    subsystem, then this node contains the time the local
    management subsystem re-initialized itself.";
              }
    
              leaf in-octets {
                type yang:counter64;
                description
                  "The total number of octets received on the interface,
    including framing characters.
    
    Discontinuities in the value of this counter can occur
    at re-initialization of the management system, and at
    other times as indicated by the value of
    'discontinuity-time'.";
                reference
                  "RFC 2863: The Interfaces Group MIB - ifHCInOctets";
    
              }
    
              leaf in-unicast-pkts {
                type yang:counter64;
                description
                  "The number of packets, delivered by this sub-layer to a
    higher (sub-)layer, that were not addressed to a
    multicast or broadcast address at this sub-layer.
    
    Discontinuities in the value of this counter can occur
    at re-initialization of the management system, and at
    other times as indicated by the value of
    'discontinuity-time'.";
                reference
                  "RFC 2863: The Interfaces Group MIB - ifHCInUcastPkts";
    
              }
    
              leaf in-broadcast-pkts {
                type yang:counter64;
                description
                  "The number of packets, delivered by this sub-layer to a
    higher (sub-)layer, that were addressed to a broadcast
    address at this sub-layer.
    
    Discontinuities in the value of this counter can occur
    at re-initialization of the management system, and at
    other times as indicated by the value of
    'discontinuity-time'.";
                reference
                  "RFC 2863: The Interfaces Group MIB -
                  	  ifHCInBroadcastPkts";
    
              }
    
              leaf in-multicast-pkts {
                type yang:counter64;
                description
                  "The number of packets, delivered by this sub-layer to a
    higher (sub-)layer, that were addressed to a multicast
    address at this sub-layer.  For a MAC-layer protocol,
    this includes both Group and Functional addresses.
    
    Discontinuities in the value of this counter can occur
    at re-initialization of the management system, and at
    other times as indicated by the value of
    'discontinuity-time'.";
                reference
                  "RFC 2863: The Interfaces Group MIB -
                  	  ifHCInMulticastPkts";
    
              }
    
              leaf in-discards {
                type yang:counter32;
                description
                  "The number of inbound packets that were chosen to be
    discarded even though no errors had been detected to
    prevent their being deliverable to a higher-layer
    protocol.  One possible reason for discarding such a
    packet could be to free up buffer space.
    
    Discontinuities in the value of this counter can occur
    at re-initialization of the management system, and at
    other times as indicated by the value of
    'discontinuity-time'.";
                reference
                  "RFC 2863: The Interfaces Group MIB - ifInDiscards";
    
              }
    
              leaf in-errors {
                type yang:counter32;
                description
                  "For packet-oriented interfaces, the number of inbound
    packets that contained errors preventing them from being
    deliverable to a higher-layer protocol.  For character-
    oriented or fixed-length interfaces, the number of
    inbound transmission units that contained errors
    preventing them from being deliverable to a higher-layer
    protocol.
    
    Discontinuities in the value of this counter can occur
    at re-initialization of the management system, and at
    other times as indicated by the value of
    'discontinuity-time'.";
                reference
                  "RFC 2863: The Interfaces Group MIB - ifInErrors";
    
              }
    
              leaf in-unknown-protos {
                type yang:counter32;
                description
                  "For packet-oriented interfaces, the number of packets
    received via the interface that were discarded because
    of an unknown or unsupported protocol.  For
    character-oriented or fixed-length interfaces that
    support protocol multiplexing, the number of
    transmission units received via the interface that were
    discarded because of an unknown or unsupported protocol.
    For any interface that does not support protocol
    multiplexing, this counter is not present.
    
    Discontinuities in the value of this counter can occur
    at re-initialization of the management system, and at
    other times as indicated by the value of
    'discontinuity-time'.";
                reference
                  "RFC 2863: The Interfaces Group MIB - ifInUnknownProtos";
    
              }
    
              leaf out-octets {
                type yang:counter64;
                description
                  "The total number of octets transmitted out of the
    interface, including framing characters.
    
    Discontinuities in the value of this counter can occur
    at re-initialization of the management system, and at
    other times as indicated by the value of
    'discontinuity-time'.";
                reference
                  "RFC 2863: The Interfaces Group MIB - ifHCOutOctets";
    
              }
    
              leaf out-unicast-pkts {
                type yang:counter64;
                description
                  "The total number of packets that higher-level protocols
    requested be transmitted, and that were not addressed
    to a multicast or broadcast address at this sub-layer,
    including those that were discarded or not sent.
    
    Discontinuities in the value of this counter can occur
    at re-initialization of the management system, and at
    other times as indicated by the value of
    'discontinuity-time'.";
                reference
                  "RFC 2863: The Interfaces Group MIB - ifHCOutUcastPkts";
    
              }
    
              leaf out-broadcast-pkts {
                type yang:counter64;
                description
                  "The total number of packets that higher-level protocols
    requested be transmitted, and that were addressed to a
    broadcast address at this sub-layer, including those
    that were discarded or not sent.
    
    Discontinuities in the value of this counter can occur
    at re-initialization of the management system, and at
    other times as indicated by the value of
    'discontinuity-time'.";
                reference
                  "RFC 2863: The Interfaces Group MIB -
                  	  ifHCOutBroadcastPkts";
    
              }
    
              leaf out-multicast-pkts {
                type yang:counter64;
                description
                  "The total number of packets that higher-level protocols
    requested be transmitted, and that were addressed to a
    multicast address at this sub-layer, including those
    that were discarded or not sent.  For a MAC-layer
    protocol, this includes both Group and Functional
    addresses.
    
    Discontinuities in the value of this counter can occur
    at re-initialization of the management system, and at
    other times as indicated by the value of
    'discontinuity-time'.";
                reference
                  "RFC 2863: The Interfaces Group MIB -
                  	  ifHCOutMulticastPkts";
    
              }
    
              leaf out-discards {
                type yang:counter32;
                description
                  "The number of outbound packets that were chosen to be
    discarded even though no errors had been detected to
    prevent their being transmitted.  One possible reason
    for discarding such a packet could be to free up buffer
    space.
    
    Discontinuities in the value of this counter can occur
    at re-initialization of the management system, and at
    other times as indicated by the value of
    'discontinuity-time'.";
                reference
                  "RFC 2863: The Interfaces Group MIB - ifOutDiscards";
    
              }
    
              leaf out-errors {
                type yang:counter32;
                description
                  "For packet-oriented interfaces, the number of outbound
    packets that could not be transmitted because of errors.
    For character-oriented or fixed-length interfaces, the
    number of outbound transmission units that could not be
    transmitted because of errors.
    
    
    
    
    Discontinuities in the value of this counter can occur
    at re-initialization of the management system, and at
    other times as indicated by the value of
    'discontinuity-time'.";
                reference
                  "RFC 2863: The Interfaces Group MIB - ifOutErrors";
    
              }
            }  // container statistics
    
            list diffserv-target-entry {
              key "direction policy-name";
              description
                "policy target for inbound or outbound direction";
              leaf direction {
                type identityref {
                  base direction;
                }
                description
                  "Direction fo the traffic flow either inbound or outbound";
              }
    
              leaf policy-name {
                type string;
                description "Policy entry name";
              }
    
              list diffserv-target-classifier-statistics {
                key "classifier-entry-name parent-path";
                description
                  "Statistics for each Classifier Entry in a Policy";
                leaf classifier-entry-name {
                  type string;
                  description
                    "Classifier Entry Name";
                }
    
                leaf parent-path {
                  type string;
                  description
                    "Path of the Classifier Entry in a hierarchial policy ";
                }
    
                container classifier-entry-statistics {
                  config false;
                  description
                    "
    This group defines the classifier filter statistics of
    each classifier entry
    
    ";
                  leaf classified-pkts {
                    type uint64;
                    description
                      " Number of total packets which filtered
     to the classifier-entry";
                  }
    
                  leaf classified-bytes {
                    type uint64;
                    description
                      " Number of total bytes which filtered
     to the classifier-entry";
                  }
    
                  leaf classified-rate {
                    type uint64;
                    units "bits-per-second";
                    description
                      " Rate of average data flow through the
     classifier-entry";
                  }
                }  // container classifier-entry-statistics
    
                list meter-statistics {
                  key "meter-id";
                  description "Meter statistics";
                  leaf meter-id {
                    type uint16;
                    description
                      "Meter Identifier";
                  }
    
                  leaf meter-succeed-pkts {
                    type uint64;
                    description
                      "Number of packets which succeed the meter";
                  }
    
                  leaf meter-succeed-bytes {
                    type uint64;
                    description
                      "Bytes of packets which succeed the meter";
                  }
    
                  leaf meter-failed-pkts {
                    type uint64;
                    description
                      "Number of packets which failed the meter";
                  }
    
                  leaf meter-failed-bytes {
                    type uint64;
                    description
                      "Bytes of packets which failed the meter";
                  }
                }  // list meter-statistics
    
                container queuing-statistics {
                  description
                    "queue related statistics ";
                  leaf output-pkts {
                    type uint64;
                    description
                      "Number of packets transmitted from queue ";
                  }
    
                  leaf output-bytes {
                    type uint64;
                    description
                      "Number of bytes transmitted from queue ";
                  }
    
                  leaf queue-size-pkts {
                    type uint64;
                    description
                      "Number of packets currently buffered ";
                  }
    
                  leaf queue-size-bytes {
                    type uint64;
                    description
                      "Number of bytes currently buffered ";
                  }
    
                  leaf drop-pkts {
                    type uint64;
                    description
                      "Total number of packets dropped ";
                  }
    
                  leaf drop-bytes {
                    type uint64;
                    description
                      "Total number of bytes dropped ";
                  }
    
                  container wred-stats {
                    description
                      "Container for WRED statistics";
                    leaf early-drop-pkts {
                      type uint64;
                      description
                        "Early drop packets ";
                    }
    
                    leaf early-drop-bytes {
                      type uint64;
                      description
                        "Early drop bytes ";
                    }
                  }  // container wred-stats
                }  // container queuing-statistics
              }  // list diffserv-target-classifier-statistics
            }  // list diffserv-target-entry
    
            container ipv4 {
              presence
                "Present if IPv4 is enabled on this interface";
              config false;
              description
                "Interface-specific parameters for the IPv4 address family.";
              leaf forwarding {
                type boolean;
                description
                  "Indicates whether IPv4 packet forwarding is enabled or
    disabled on this interface.";
              }
    
              leaf mtu {
                type uint16 {
                  range "68..max";
                }
                units "octets";
                description
                  "The size, in octets, of the largest IPv4 packet that the
    interface will send and receive.";
                reference
                  "RFC 791: Internet Protocol";
    
              }
    
              list address {
                key "ip";
                description
                  "The list of IPv4 addresses on the interface.";
                leaf ip {
                  type inet:ipv4-address-no-zone;
                  description
                    "The IPv4 address on the interface.";
                }
    
                choice subnet {
                  description
                    "The subnet can be specified as a prefix-length, or,
    if the server supports non-contiguous netmasks, as
    a netmask.";
                  leaf prefix-length {
                    type uint8 {
                      range "0..32";
                    }
                    description
                      "The length of the subnet prefix.";
                  }
                  leaf netmask {
                    if-feature ipv4-non-contiguous-netmasks;
                    type yang:dotted-quad;
                    description
                      "The subnet specified as a netmask.";
                  }
                }  // choice subnet
    
                leaf origin {
                  type ip-address-origin;
                  description
                    "The origin of this address.";
                }
              }  // list address
    
              list neighbor {
                key "ip";
                description
                  "A list of mappings from IPv4 addresses to
    link-layer addresses.
    This list represents the ARP Cache.";
                reference
                  "RFC 826: An Ethernet Address Resolution Protocol";
    
                leaf ip {
                  type inet:ipv4-address-no-zone;
                  description
                    "The IPv4 address of the neighbor node.";
                }
    
                leaf link-layer-address {
                  type yang:phys-address;
                  description
                    "The link-layer address of the neighbor node.";
                }
    
                leaf origin {
                  type neighbor-origin;
                  description
                    "The origin of this neighbor entry.";
                }
              }  // list neighbor
            }  // container ipv4
    
            container ipv6 {
              presence
                "Present if IPv6 is enabled on this interface";
              config false;
              description
                "Parameters for the IPv6 address family.";
              leaf forwarding {
                type boolean;
                default "false";
                description
                  "Indicates whether IPv6 packet forwarding is enabled or
    disabled on this interface.";
                reference
                  "RFC 4861: Neighbor Discovery for IP version 6 (IPv6)
                  	  Section 6.2.1, IsRouter";
    
              }
    
              leaf mtu {
                type uint32 {
                  range "1280..max";
                }
                units "octets";
                description
                  "The size, in octets, of the largest IPv6 packet that the
    interface will send and receive.";
                reference
                  "RFC 2460: Internet Protocol, Version 6 (IPv6) Specification
                  	  Section 5";
    
              }
    
              list address {
                key "ip";
                description
                  "The list of IPv6 addresses on the interface.";
                leaf ip {
                  type inet:ipv6-address-no-zone;
                  description
                    "The IPv6 address on the interface.";
                }
    
                leaf prefix-length {
                  type uint8 {
                    range "0..128";
                  }
                  mandatory true;
                  description
                    "The length of the subnet prefix.";
                }
    
                leaf origin {
                  type ip-address-origin;
                  description
                    "The origin of this address.";
                }
    
                leaf status {
                  type enumeration {
                    enum "preferred" {
                      value 0;
                      description
                        "This is a valid address that can appear as the
    destination or source address of a packet.";
                    }
                    enum "deprecated" {
                      value 1;
                      description
                        "This is a valid but deprecated address that should
    no longer be used as a source address in new
    communications, but packets addressed to such an
    address are processed as expected.";
                    }
                    enum "invalid" {
                      value 2;
                      description
                        "This isn't a valid address, and it shouldn't appear
    as the destination or source address of a packet.";
                    }
                    enum "inaccessible" {
                      value 3;
                      description
                        "The address is not accessible because the interface
    to which this address is assigned is not
    operational.";
                    }
                    enum "unknown" {
                      value 4;
                      description
                        "The status cannot be determined for some reason.";
                    }
                    enum "tentative" {
                      value 5;
                      description
                        "The uniqueness of the address on the link is being
    verified.  Addresses in this state should not be
    used for general communication and should only be
    used to determine the uniqueness of the address.";
                    }
                    enum "duplicate" {
                      value 6;
                      description
                        "The address has been determined to be non-unique on
    the link and so must not be used.";
                    }
                    enum "optimistic" {
                      value 7;
                      description
                        "The address is available for use, subject to
    restrictions, while its uniqueness on a link is
    being verified.";
                    }
                  }
                  description
                    "The status of an address.  Most of the states correspond
    to states from the IPv6 Stateless Address
    Autoconfiguration protocol.";
                  reference
                    "RFC 4293: Management Information Base for the
                    	  Internet Protocol (IP)
                    	  - IpAddressStatusTC
                     RFC 4862: IPv6 Stateless Address Autoconfiguration";
    
                }
              }  // list address
    
              list neighbor {
                key "ip";
                description
                  "A list of mappings from IPv6 addresses to
    link-layer addresses.
    This list represents the Neighbor Cache.";
                reference
                  "RFC 4861: Neighbor Discovery for IP version 6 (IPv6)";
    
                leaf ip {
                  type inet:ipv6-address-no-zone;
                  description
                    "The IPv6 address of the neighbor node.";
                }
    
                leaf link-layer-address {
                  type yang:phys-address;
                  description
                    "The link-layer address of the neighbor node.";
                }
    
                leaf origin {
                  type neighbor-origin;
                  description
                    "The origin of this neighbor entry.";
                }
    
                leaf is-router {
                  type empty;
                  description
                    "Indicates that the neighbor node acts as a router.";
                }
    
                leaf state {
                  type enumeration {
                    enum "incomplete" {
                      value 0;
                      description
                        "Address resolution is in progress, and the link-layer
    address of the neighbor has not yet been
    determined.";
                    }
                    enum "reachable" {
                      value 1;
                      description
                        "Roughly speaking, the neighbor is known to have been
    reachable recently (within tens of seconds ago).";
                    }
                    enum "stale" {
                      value 2;
                      description
                        "The neighbor is no longer known to be reachable, but
    until traffic is sent to the neighbor no attempt
    should be made to verify its reachability.";
                    }
                    enum "delay" {
                      value 3;
                      description
                        "The neighbor is no longer known to be reachable, and
    traffic has recently been sent to the neighbor.
    Rather than probe the neighbor immediately, however,
    delay sending probes for a short while in order to
    give upper-layer protocols a chance to provide
    reachability confirmation.";
                    }
                    enum "probe" {
                      value 4;
                      description
                        "The neighbor is no longer known to be reachable, and
    unicast Neighbor Solicitation probes are being sent
    to verify reachability.";
                    }
                  }
                  description
                    "The Neighbor Unreachability Detection state of this
    entry.";
                  reference
                    "RFC 4861: Neighbor Discovery for IP version 6 (IPv6)
                    	  Section 7.3.2";
    
                }
              }  // list neighbor
            }  // container ipv6
    
            container pseudowire {
              description
                "Pseudowire-specific interface operational state";
              leaf neighbor-ip-address {
                type inet:ip-address;
                description
                  "IPv4 or IPv6 address of the neighbor.";
              }
    
              leaf vc-id {
                type uint32 {
                  range "1..4294967295";
                }
                description "Pseudowire VC ID";
              }
            }  // container pseudowire
    
            leaf routing-instance {
              type string;
              must
                "../if:name=/rt:routing-state/rt:routing-instance[rt:name=current()]/rt:interfaces/rt:interface" {
                error-message
                  "The interface is not assigned to the routing instance.";
                description
                  "The reference must mirror a corresponding assignment under
    routing-instance.";
              }
              description
                "The name of the routing instance to which the interface is
    assigned.";
            }
          }  // list interface
        }  // container interfaces-state
      }  // module ietf-interfaces
    

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