ietf-softwire-br

This document defines a YANG module for the configuration and management of A+P Softwire Border Routers. It covers Lightweight ...

  • Version: 2019-11-16

    ietf-softwire-br@2019-11-16


    
      module ietf-softwire-br {
    
        yang-version 1.1;
    
        namespace
          "urn:ietf:params:xml:ns:yang:ietf-softwire-br";
    
        prefix softwire-br;
    
        import ietf-inet-types {
          prefix inet;
          reference
            "RFC 6991: Common YANG Data Types, Section 4";
    
    
        }
        import ietf-yang-types {
          prefix yang;
          reference
            "RFC 6991: Common YANG Data Types, Section 3";
    
    
        }
        import ietf-softwire-common {
          prefix softwire-common;
          reference
            "RFC 8676: YANG Modules for IPv4-in-IPv6 Address plus Port
            (A+P) Softwires";
    
    
        }
    
        organization
          "IETF Softwire Working Group";
    
        contact
          "WG Web:   <https://datatracker.ietf.org/wg/softwire/>
         WG List:  <mailto:softwire@ietf.org>
    
         Author:  Qi Sun
                  <mailto:sunqi.ietf@gmail.com>
    
         Author:  Linhui Sun
                  <mailto:lh.sunlinh@gmail.com>
    
         Author:  Yong Cui
                  <mailto:yong@csnet1.cs.tsinghua.edu.cn>
    
         Editor:  Ian Farrer
                  <mailto:ian.farrer@telekom.de>
    
         Author:  Sladjana Zoric
                  <mailto:sladjana.zoric@telekom.de>
    
         Editor:  Mohamed Boucadair
                  <mailto:mohamed.boucadair@orange.com>
    
         Author:  Rajiv Asati
                   <mailto:rajiva@cisco.com>";
    
        description
          "This document defines a YANG module for the configuration and
         management of A+P Softwire Border Routers.  It covers
         Lightweight 4over6, MAP-E, and MAP-T mechanisms.
    
         Copyright (c) 2019 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 8676; see
         the RFC itself for full legal notices.";
    
        revision "2019-11-16" {
          description "Initial revision.";
          reference
            "RFC 8676: YANG Modules for IPv4-in-IPv6 Address plus Port
            (A+P) Softwires";
    
        }
    
    
        feature binding-mode {
          description
            "Binding is used for configuring the Lightweight 4over6
           mechanism.
    
           Binding-based softwire mechanisms are IPv4-over-IPv6 tunneling
           transition mechanisms specifically intended for complete
           independence between the IPv6 subnet prefix (and IPv6 address)
           and IPv4 address, with or without IPv4 address sharing.
    
           This is accomplished by maintaining state for each softwire
           (per-subscriber state) in the central Border Relay (BR) and
           using a hub-and-spoke forwarding architecture.  In order to
           delegate the NAPT function and achieve IPv4 address sharing,
           port-restricted IPv4 addresses needs to be allocated to CEs.
    
           This feature indicates that the network element can function
           as one or more binding-based softwire instances.";
          reference
            "RFC 7596: Lightweight 4over6: An Extension to the Dual-Stack
            Lite Architecture
             RFC 7597: Mapping of Address and Port with Encapsulation
            (MAP-E)
             RFC 7599: Mapping of Address and Port using Translation
            (MAP-T)";
    
        }
    
        feature map-e {
          description
            "MAP-E is an IPv6 transition mechanism for transporting IPv4
           packets across an IPv6 network using IP encapsulation.  MAP-E
           allows for a reduction of the amount of centralized state
           using rules to express IPv4/IPv6 address mappings.  This
           introduces an algorithmic relationship between the IPv6 subnet
           and IPv4 address.
    
           This feature indicates that the network element can function
           as one or more MAP-E softwire instances.";
          reference
            "RFC 7597: Mapping of Address and Port with Encapsulation
            (MAP-E)";
    
        }
    
        feature map-t {
          description
            "MAP-T is an IPv6 transition mechanism for transporting IPv4
           packets across an IPv6 network using IP translation.  It
           leverages a double stateless NAT64-based solution as well
           as the stateless algorithmic address and transport layer
           port mapping algorithm defined for MAP-E.
    
           This feature indicates that the network element can function
           as one or more MAP-T softwire instances.";
          reference
            "RFC 7599: Mapping of Address and Port using Translation
            (MAP-T)";
    
        }
    
        container br-instances {
          description
            "BR instances enabled in a network element.";
          choice br-type {
            description
              "Select binding or algorithmic BR functionality.";
            case binding {
              if-feature binding-mode;
              container binding {
                description
                  "binding mechanism (binding table) configuration.";
                list bind-instance {
                  key "name";
                  description
                    "A set of binding instances to be configured.";
                  leaf name {
                    type string;
                    mandatory true;
                    description
                      "The name for the binding BR.  It is used to uniquely
                     distinguish a binding instance by its name.";
                  }
    
                  container binding-table-versioning {
                    description
                      "binding table's version";
                    leaf version {
                      type uint64;
                      description
                        "Version number for this binding table.";
                    }
    
                    leaf date {
                      type yang:date-and-time;
                      description
                        "Timestamp when the binding table was activated.
    
                       A binding instance may be provided with binding
                       entries that may change in time (e.g., increase
                       the size of the port set).  When a party who is
                       the victim of abuse presents an external IP
                       address/port, the version of the binding table
                       is important because, depending on the version,
                       a distinct customer may be identified.
    
                       The timestamp is used as a key to find the
                       appropriate binding table that was put into effect
                       when an abuse occurred.";
                      reference
                        "RFC 7422: Deterministic Address Mapping to Reduce
                        Logging in Carrier-Grade NAT Deployments";
    
                    }
                  }  // container binding-table-versioning
    
                  leaf softwire-num-max {
                    type uint32 {
                      range "1..max";
                    }
                    mandatory true;
                    description
                      "The maximum number of softwires that can be created
                     on the binding BR.";
                  }
    
                  leaf softwire-payload-mtu {
                    type uint16;
                    units "bytes";
                    mandatory true;
                    description
                      "The payload IPv4 MTU for binding softwire.";
                  }
    
                  leaf softwire-path-mru {
                    type uint16;
                    units "bytes";
                    mandatory true;
                    description
                      "The path MRU for binding softwire";
                    reference
                      "RFC 4213: Basic Transition Mechanisms for IPv6 Hosts
                      	  and Routers";
    
                  }
    
                  leaf enable-hairpinning {
                    type boolean;
                    default "true";
                    description
                      "Enables/disables support for locally forwarding
                     (hairpinning) traffic between two CEs";
                    reference
                      "RFC 7596: Lightweight 4over6: An Extension to
                      the Dual-Stack Lite Architecture, Section 6.2";
    
                  }
    
                  container binding-table {
                    description "binding table";
                    list binding-entry {
                      key "binding-ipv6info";
                      description
                        "binding entry";
                      leaf binding-ipv6info {
                        type union {
                          type inet:ipv6-address;
                          type inet:ipv6-prefix;
                        }
                        description
                          "The IPv6 information for a CE binding entry.
    When the IPv6 prefix type is used,
    the IPv6 source address of the CE is constructed
    according to the description in RFC 7596;
    if the IPv6 address type is used, the CE can use
    any valid /128 address from a prefix assigned to
    the CE.";
                        reference
                          "RFC 7596: Lightweight 4over6: An Extension to the Dual-Stack
                          Lite Architecture";
    
                      }
    
                      leaf binding-ipv4-addr {
                        type inet:ipv4-address;
                        description
                          "The IPv4 address assigned to the binding CE,
    which is used as the IPv4 external address
    for binding CE local NAPT44.";
                      }
    
                      container port-set {
                        description
                          "For Lightweight 4over6, the default value
    for offset should be 0, to configure one contiguous
    port range.";
                        leaf psid-offset {
                          type uint8 {
                            range "0..16";
                          }
                          description
                            "The number of offset bits.  In Lightweight 4over6,
    the default value is 0 for assigning one contiguous
    port range.  In MAP-E/T, the default value is 6,
    which means the system ports (0-1023) are excluded by
    default and the assigned port ranges are distributed across
    the entire port space, depending on either psid-len or the
    number of contiguous ports.";
                        }
    
                        leaf psid-len {
                          type uint8 {
                            range "0..15";
                          }
                          mandatory true;
                          description
                            "The length of PSID, representing the sharing
    ratio for an IPv4 address.  This, along with ea-len, can
    be used to calculate the number of contiguous ports per
    port range";
                        }
    
                        leaf psid {
                          type uint16;
                          mandatory true;
                          description
                            "Port Set Identifier (PSID) value, which
    identifies a set of ports algorithmically.";
                        }
                      }  // container port-set
    
                      leaf br-ipv6-addr {
                        type inet:ipv6-address;
                        description
                          "The IPv6 address for binding BR.";
                      }
                    }  // list binding-entry
                  }  // container binding-table
    
                  container icmp-policy {
                    description
                      "The binding BR can be configured to process or drop
                     incoming ICMP messages and to generate outgoing ICMP
                     error messages.";
                    container icmpv4-errors {
                      description
                        "ICMPv4 error processing configuration";
                      leaf allow-incoming-icmpv4 {
                        type boolean;
                        default "true";
                        description
                          "Enables the processing of incoming ICMPv4
                         packets.";
                        reference
                          "RFC 7596: Lightweight 4over6: An Extension to
                          the Dual-Stack Lite Architecture";
    
                      }
    
                      leaf icmpv4-rate {
                        type uint32;
                        description
                          "Rate limit threshold in messages per second
                         for processing incoming ICMPv4 errors messages";
                      }
    
                      leaf generate-icmpv4-errors {
                        type boolean;
                        default "true";
                        description
                          "Enables the generation of outgoing ICMPv4 error
                         messages on receipt of an inbound IPv4 packet
                         with no matching binding table entry.";
                        reference
                          "RFC 7596: Lightweight 4over6:
                          An Extension to the Dual-Stack Lite
                          Architecture, Section 5.2";
    
                      }
                    }  // container icmpv4-errors
    
                    container icmpv6-errors {
                      description
                        "ICMPv6 error processing configuration";
                      leaf generate-icmpv6-errors {
                        type boolean;
                        default "true";
                        description
                          "Enables the generation of ICMPv6 error messages
                         if no matching binding table entry is found for
                         a received packet.";
                        reference
                          "RFC 7596: Lightweight 4over6:
                          An Extension to the Dual-Stack Lite
                          Architecture, Section 6.2";
    
                      }
    
                      leaf icmpv6-rate {
                        type uint32;
                        description
                          "Rate limit threshold in messages per second
                         for sending ICMPv6 errors messages";
                        reference
                          "RFC 7596: Lightweight 4over6: An Extension
                          to the Dual-Stack Lite Architecture, Section 9";
    
                      }
                    }  // container icmpv6-errors
                  }  // container icmp-policy
    
                  container traffic-stat {
                    config false;
                    description
                      "Traffic statistics information for the BR.";
                    leaf discontinuity-time {
                      type yang:date-and-time;
                      mandatory true;
                      description
                        "The time of the most recent occasion on which the
                       BR instance suffered a discontinuity.  This must
                       be initialized when the BR instance is configured
                       or rebooted.";
                    }
    
                    leaf sent-ipv4-packets {
                      type yang:zero-based-counter64;
                      description
                        "Number of decapsulated and forwarded IPv4 packets.
    
    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'.";
                    }
    
                    leaf sent-ipv4-bytes {
                      type yang:zero-based-counter64;
                      description
                        "Decapsulated/translated IPv4 traffic sent, in bytes.
    
    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'.";
                    }
    
                    leaf sent-ipv6-packets {
                      type yang:zero-based-counter64;
                      description
                        "Number of encapsulated IPv6 packets 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'.";
                    }
    
                    leaf sent-ipv6-bytes {
                      type yang:zero-based-counter64;
                      description
                        "Encapsulated IPv6 traffic sent, in bytes.
    
    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'.";
                    }
    
                    leaf rcvd-ipv4-packets {
                      type yang:zero-based-counter64;
                      description
                        "Number of IPv4 packets received.
    
    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'.";
                    }
    
                    leaf rcvd-ipv4-bytes {
                      type yang:zero-based-counter64;
                      description
                        "IPv4 traffic received, in bytes.
    
    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'.";
                    }
    
                    leaf rcvd-ipv6-packets {
                      type yang:zero-based-counter64;
                      description
                        "Number of IPv4-in-IPv6 packets received.
    
    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'.";
                    }
    
                    leaf rcvd-ipv6-bytes {
                      type yang:zero-based-counter64;
                      description
                        "IPv4-in-IPv6 traffic received, in bytes.
    
    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'.";
                    }
    
                    leaf dropped-ipv4-packets {
                      type yang:zero-based-counter64;
                      description
                        "Number of IPv4 packets dropped at the
    Internet-facing interface.
    
    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'.";
                    }
    
                    leaf dropped-ipv4-bytes {
                      type yang:zero-based-counter64;
                      description
                        "IPv4 traffic dropped at the Internet-facing
    interface, in bytes.
    
    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'.";
                    }
    
                    leaf dropped-ipv6-packets {
                      type yang:zero-based-counter64;
                      description
                        "Number of IPv4-in-IPv6 packets dropped.
    
    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'.";
                    }
    
                    leaf dropped-ipv6-bytes {
                      type yang:zero-based-counter64;
                      description
                        "IPv4-in-IPv6 traffic dropped, in bytes.
    
    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'.";
                    }
    
                    leaf dropped-ipv4-fragments {
                      type yang:zero-based-counter64;
                      description
                        "Number of fragmented IPv4 packets dropped.
    
    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'.";
                    }
    
                    leaf dropped-ipv4-fragment-bytes {
                      type yang:zero-based-counter64;
                      description
                        "Fragmented IPv4 traffic dropped, in bytes.
    
    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'.";
                    }
    
                    leaf ipv6-fragments-reassembled {
                      type yang:zero-based-counter64;
                      description
                        "Number of IPv6 fragments successfully reassembled.
    
    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'.";
                    }
    
                    leaf ipv6-fragments-bytes-reassembled {
                      type yang:zero-based-counter64;
                      description
                        "IPv6 fragments successfully reassembled, in bytes.
    
    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'.";
                    }
    
                    leaf out-icmpv4-error-packets {
                      type yang:zero-based-counter64;
                      description
                        "Internally generated ICMPv4 error packets.
    
    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'.";
                    }
    
                    leaf out-icmpv4-error-bytes {
                      type yang:zero-based-counter64;
                      description
                        "Internally generated ICMPv4 error messages, in bytes.
    
    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'.";
                    }
    
                    leaf out-icmpv6-error-packets {
                      type yang:zero-based-counter64;
                      description
                        "Internally generated ICMPv6 error packets.
    
    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'.";
                    }
    
                    leaf out-icmpv6-error-bytes {
                      type yang:zero-based-counter64;
                      description
                        "Internally generated ICMPv6 error messages, in bytes.
    
    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'.";
                    }
    
                    leaf dropped-icmpv4-packets {
                      type yang:zero-based-counter64;
                      description
                        "ICMPv4 packets that are dropped as a result
                       of the ICMP policy.  Typically, this can be any
                       incoming ICMPv4 packets if ICMPv4 processing is
                       disabled or incoming ICMPv4 packets that exceed
                       the ICMPv4 rate-limit threshold.
    
                       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'.";
                    }
    
                    leaf dropped-icmpv4-bytes {
                      type yang:zero-based-counter64;
                      description
                        "ICMPv4 messages, in bytes, that are dropped as
                       a result of the ICMP policy.  Typically, it
                       can be any incoming ICMPv4 packets if ICMPv4
                       processing is disabled or incoming ICMPv4
                       packets that exceed the ICMPv4 rate-limit
                       threshold.
    
                       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'.";
                    }
    
                    leaf hairpin-ipv4-packets {
                      type yang:zero-based-counter64;
                      description
                        "IPv4 packets locally routed between two CEs
                       (hairpinned).
    
                       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'.";
                    }
    
                    leaf hairpin-ipv4-bytes {
                      type yang:zero-based-counter64;
                      description
                        "IPv4 bytes locally routed between two CEs
                       (hairpinned).
    
                       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'.";
                    }
    
                    leaf active-softwire-num {
                      type uint32;
                      config false;
                      description
                        "The number of currently active softwires on the
                       binding instance.
    
                       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'.";
                    }
                  }  // container traffic-stat
                }  // list bind-instance
              }  // container binding
            }  // case binding
    
            case algo {
              if-feature map-e or map-t;
              container algorithm {
                description
                  "A set of parameters used for MAP-E/MAP-T";
                list algo-instance {
                  key "name";
                  description
                    "Instances of algorithm";
                  leaf name {
                    type string;
                    mandatory true;
                    description
                      "The name is used to uniquely identify an algorithm
                     instance.
    
                     This name can be automatically assigned
                     or explicitly configured.";
                  }
    
                  leaf enable {
                    type boolean;
                    description
                      "Enable/disable an individual MAP-E or MAP-T rule.";
                  }
    
                  container algo-versioning {
                    description
                      "Version number for this algorithm instance";
                    leaf version {
                      type uint64;
                      description
                        "A version number for the mapping algorithm
    rules provided to the algorithm instance";
                    }
    
                    leaf date {
                      type yang:date-and-time;
                      description
                        "Timestamp when the algorithm instance was activated.
    
    An algorithm instance may be provided with mapping
    rules that may change in time (for example, increase
    the size of the port set).  When a party who is the victim
    of abuse presents an external IP address/port, the version
    of the algorithm is important because depending on
    the version, a distinct customer may be identified.
    
    The timestamp is used as a key to find the appropriate
    algorithm that was put into effect when an abuse
    occurred.";
                      reference
                        "RFC 7422: Deterministic Address Mapping to Reduce
                        	  Logging in Carrier-Grade NAT Deployments";
    
                    }
                  }  // container algo-versioning
    
                  choice data-plane {
                    description
                      "Selects MAP-E (encapsulation) or MAP-T
    (translation)";
                    case encapsulation {
                      if-feature map-e;
                      description
                        "encapsulation for MAP-E";
                      leaf br-ipv6-addr {
                        type inet:ipv6-address;
                        mandatory true;
                        description
                          "The IPv6 address of the MAP-E BR.";
                      }
                    }  // case encapsulation
    
                    case translation {
                      if-feature map-t;
                      description
                        "translation for MAP-T";
                      leaf dmr-ipv6-prefix {
                        type inet:ipv6-prefix;
                        description
                          "The IPv6 prefix of the MAP-T BR.";
                      }
                    }  // case translation
                  }  // choice data-plane
    
                  leaf ea-len {
                    type uint8;
                    mandatory true;
                    description
                      "Embedded Address (EA) bits are the IPv4 EA-bits in the IPv6
    address identifying an IPv4 prefix/address (or part thereof)
    or a shared IPv4 address (or part thereof) and a port-set
    identifier.  The length of the EA-bits is defined as part of
    a MAP rule for a MAP domain.";
                  }
    
                  leaf rule-ipv6-prefix {
                    type inet:ipv6-prefix;
                    mandatory true;
                    description
                      "The Rule IPv6 prefix defined in the mapping rule.";
                  }
    
                  leaf rule-ipv4-prefix {
                    type inet:ipv4-prefix;
                    mandatory true;
                    description
                      "The Rule IPv4 prefix defined in the mapping rule.";
                  }
    
                  leaf forwarding {
                    type boolean;
                    mandatory true;
                    description
                      "This parameter specifies whether the rule may be used for
    forwarding; if set, this rule is used as a Forwarding
    Mapping Rule (FMR); if not set, this rule is a Basic
    Mapping Rule (BMR) only and must not be used for
    forwarding.";
                  }
    
                  container port-set {
                    description
                      "Indicates a set of ports.";
                    leaf psid-offset {
                      type uint8 {
                        range "0..16";
                      }
                      description
                        "The number of offset bits.  In Lightweight 4over6,
    the default value is 0 for assigning one contiguous
    port range.  In MAP-E/T, the default value is 6,
    which means the system ports (0-1023) are excluded by
    default and the assigned port ranges are distributed across
    the entire port space, depending on either psid-len or the
    number of contiguous ports.";
                    }
    
                    leaf psid-len {
                      type uint8 {
                        range "0..15";
                      }
                      mandatory true;
                      description
                        "The length of PSID, representing the sharing
    ratio for an IPv4 address.  This, along with ea-len, can
    be used to calculate the number of contiguous ports per
    port range";
                    }
    
                    leaf psid {
                      type uint16;
                      mandatory true;
                      description
                        "Port Set Identifier (PSID) value, which
    identifies a set of ports algorithmically.";
                    }
                  }  // container port-set
    
                  container traffic-stat {
                    config false;
                    description
                      "Traffic statistics information for the BR.";
                    leaf discontinuity-time {
                      type yang:date-and-time;
                      mandatory true;
                      description
                        "The time of the most recent occasion on which the
                       BR instance suffered a discontinuity.  This must
                       be reset to the current date-and-time when the BR
                       instance is configured or rebooted.";
                    }
    
                    leaf sent-ipv4-packets {
                      type yang:zero-based-counter64;
                      description
                        "Number of decapsulated and forwarded IPv4 packets.
    
    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'.";
                    }
    
                    leaf sent-ipv4-bytes {
                      type yang:zero-based-counter64;
                      description
                        "Decapsulated/translated IPv4 traffic sent, in bytes.
    
    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'.";
                    }
    
                    leaf sent-ipv6-packets {
                      type yang:zero-based-counter64;
                      description
                        "Number of encapsulated IPv6 packets 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'.";
                    }
    
                    leaf sent-ipv6-bytes {
                      type yang:zero-based-counter64;
                      description
                        "Encapsulated IPv6 traffic sent, in bytes.
    
    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'.";
                    }
    
                    leaf rcvd-ipv4-packets {
                      type yang:zero-based-counter64;
                      description
                        "Number of IPv4 packets received.
    
    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'.";
                    }
    
                    leaf rcvd-ipv4-bytes {
                      type yang:zero-based-counter64;
                      description
                        "IPv4 traffic received, in bytes.
    
    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'.";
                    }
    
                    leaf rcvd-ipv6-packets {
                      type yang:zero-based-counter64;
                      description
                        "Number of IPv4-in-IPv6 packets received.
    
    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'.";
                    }
    
                    leaf rcvd-ipv6-bytes {
                      type yang:zero-based-counter64;
                      description
                        "IPv4-in-IPv6 traffic received, in bytes.
    
    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'.";
                    }
    
                    leaf dropped-ipv4-packets {
                      type yang:zero-based-counter64;
                      description
                        "Number of IPv4 packets dropped at the
    Internet-facing interface.
    
    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'.";
                    }
    
                    leaf dropped-ipv4-bytes {
                      type yang:zero-based-counter64;
                      description
                        "IPv4 traffic dropped at the Internet-facing
    interface, in bytes.
    
    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'.";
                    }
    
                    leaf dropped-ipv6-packets {
                      type yang:zero-based-counter64;
                      description
                        "Number of IPv4-in-IPv6 packets dropped.
    
    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'.";
                    }
    
                    leaf dropped-ipv6-bytes {
                      type yang:zero-based-counter64;
                      description
                        "IPv4-in-IPv6 traffic dropped, in bytes.
    
    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'.";
                    }
    
                    leaf dropped-ipv4-fragments {
                      type yang:zero-based-counter64;
                      description
                        "Number of fragmented IPv4 packets dropped.
    
    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'.";
                    }
    
                    leaf dropped-ipv4-fragment-bytes {
                      type yang:zero-based-counter64;
                      description
                        "Fragmented IPv4 traffic dropped, in bytes.
    
    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'.";
                    }
    
                    leaf ipv6-fragments-reassembled {
                      type yang:zero-based-counter64;
                      description
                        "Number of IPv6 fragments successfully reassembled.
    
    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'.";
                    }
    
                    leaf ipv6-fragments-bytes-reassembled {
                      type yang:zero-based-counter64;
                      description
                        "IPv6 fragments successfully reassembled, in bytes.
    
    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'.";
                    }
    
                    leaf out-icmpv4-error-packets {
                      type yang:zero-based-counter64;
                      description
                        "Internally generated ICMPv4 error packets.
    
    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'.";
                    }
    
                    leaf out-icmpv4-error-bytes {
                      type yang:zero-based-counter64;
                      description
                        "Internally generated ICMPv4 error messages, in bytes.
    
    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'.";
                    }
    
                    leaf out-icmpv6-error-packets {
                      type yang:zero-based-counter64;
                      description
                        "Internally generated ICMPv6 error packets.
    
    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'.";
                    }
    
                    leaf out-icmpv6-error-bytes {
                      type yang:zero-based-counter64;
                      description
                        "Internally generated ICMPv6 error messages, in bytes.
    
    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'.";
                    }
                  }  // container traffic-stat
                }  // list algo-instance
              }  // container algorithm
            }  // case algo
          }  // choice br-type
        }  // container br-instances
    
        notification softwire-binding-instance-event {
          if-feature binding-mode;
          description
            "Notifications for the binding instance when an entry is
           added, modified, or is not valid anymore.";
          leaf bind-name {
            type leafref {
              path "/br-instances/binding/bind-instance/name";
            }
            description
              "The name of the binding-instance that
             generated the notification.";
          }
    
          leaf-list invalid-entry {
            type leafref {
              path "/br-instances/binding/bind-instance[name=current()/../bind-name]/binding-table/binding-entry/binding-ipv6info";
            }
            description
              "Notify the client that a specific binding entry has
             expired or is invalid.  The binding-ipv6info identifies
             an entry.";
          }
    
          leaf-list added-entry {
            type inet:ipv6-address;
            description
              "Notify the client that a binding entry has been added.
             The IPv6 address of that entry is the index.  The client
             gets other information from the binding BR about the entry
             indexed by that ipv6 address.";
          }
    
          leaf-list modified-entry {
            type leafref {
              path "/br-instances/binding/bind-instance[name=current()/../bind-name]/binding-table/binding-entry/binding-ipv6info";
            }
            description
              "The binding table entry that has been modified.";
          }
        }  // notification softwire-binding-instance-event
    
        notification softwire-algorithm-instance-event {
          if-feature map-e or map-t;
          description
            "Notifications for an algorithm instance when an entry is
           added, modified, or is not valid anymore.";
          leaf algo-name {
            type leafref {
              path "/br-instances/algorithm/algo-instance/name";
            }
            mandatory true;
            description
              "Algorithmic instance event.";
          }
    
          leaf-list invalid-entry {
            type leafref {
              path "/br-instances/algorithm/algo-instance/name";
            }
            description "Invalid entry.";
          }
    
          leaf-list added-entry {
            type leafref {
              path "/br-instances/algorithm/algo-instance/name";
            }
            description "Added entry.";
          }
    
          leaf-list modified-entry {
            type leafref {
              path "/br-instances/algorithm/algo-instance/name";
            }
            description "Modified entry.";
          }
        }  // notification softwire-algorithm-instance-event
      }  // module ietf-softwire-br
    

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