path: root/doc/rfc/rfc9166.txt

Internet Engineering Task Force (IETF)                           H. Zhao
Request for Comments: 9166                                      Ericsson
Category: Standards Track                                         X. Liu
ISSN: 2070-1721                                          IBM Corporation
                                                                  Y. Liu
                                                            China Mobile
                                                                A. Peter
                                                              Individual
                                                            M. Sivakumar
                                                        Juniper Networks
                                                            January 2022


  A YANG Data Model for Internet Group Management Protocol (IGMP) and
              Multicast Listener Discovery (MLD) Snooping

Abstract

   This document defines a YANG data model that can be used to configure
   and manage Internet Group Management Protocol (IGMP) and Multicast
   Listener Discovery (MLD) snooping devices.  The YANG module in this
   document conforms to the Network Management Datastore Architecture
   (NMDA).

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in Section 2 of RFC 7841.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   https://www.rfc-editor.org/info/rfc9166.

Copyright Notice

   Copyright (c) 2022 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (https://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Revised BSD License text as described in Section 4.e of the
   Trust Legal Provisions and are provided without warranty as described
   in the Revised BSD License.

Table of Contents

   1.  Introduction
     1.1.  Terminology
     1.2.  Tree Diagrams
     1.3.  Prefixes in Data Node Names
   2.  Design of Data Model
     2.1.  Overview
     2.2.  Optional Capabilities
     2.3.  Position of Address Family in Hierarchy
   3.  Module Structure
     3.1.  IGMP Snooping Instances
     3.2.  MLD Snooping Instances
     3.3.  Using IGMP and MLD Snooping Instances
     3.4.  IGMP and MLD Snooping Actions
   4.  IGMP and MLD Snooping YANG Module
   5.  Security Considerations
   6.  IANA Considerations
     6.1.  XML Registry
     6.2.  YANG Module Names Registry
   7.  References
     7.1.  Normative References
     7.2.  Informative References
   Appendix A.  Data Tree Example
   Authors' Addresses

1.  Introduction

   This document defines a YANG [RFC7950] data model for the management
   of IGMP and MLD snooping [RFC4541] devices.

   The YANG module in this document conforms to the NMDA defined in
   [RFC8342].  The NMDA adds the ability to inspect the current
   operational values for configuration, allowing clients to use
   identical paths for retrieving the configured values and the
   operational values.

1.1.  Terminology

   The terminology for describing YANG data models is found in [RFC6020]
   and [RFC7950], including:

   *  augment

   *  data model

   *  data node

   *  identity

   *  module

   The following terminologies are used in this document:

   mrouter:  multicast router, which is a router that has multicast
         routing enabled [RFC4286].

   mrouter interfaces:  snooping switch ports where multicast routers
         are attached [RFC4541].

   The following abbreviations are used in this document and defined
   model:

   IGMP:  Internet Group Management Protocol [RFC3376].

   MLD:  Multicast Listener Discovery [RFC3810].

1.2.  Tree Diagrams

   Tree diagrams used in this document follow the notation defined in
   [RFC8340].

1.3.  Prefixes in Data Node Names

   In this document, names of data nodes, actions, and other data model
   objects are often used without a prefix, as long as it is clear from
   the context in which YANG module each name is defined.  Otherwise,
   names are prefixed using the standard prefix associated with the
   corresponding YANG module, as shown in Table 1.

              +==========+======================+===========+
              | Prefix   | YANG module          | Reference |
              +==========+======================+===========+
              | inet     | ietf-inet-types      | [RFC6991] |
              +----------+----------------------+-----------+
              | yang     | ietf-yang-types      | [RFC6991] |
              +----------+----------------------+-----------+
              | if       | ietf-interfaces      | [RFC8343] |
              +----------+----------------------+-----------+
              | rt       | ietf-routing         | [RFC8349] |
              +----------+----------------------+-----------+
              | rt-types | ietf-routing-types   | [RFC8294] |
              +----------+----------------------+-----------+
              | dot1q    | ieee802-dot1q-bridge | [dot1Qcp] |
              +----------+----------------------+-----------+

                  Table 1: Prefixes and Corresponding YANG
                                  Modules

2.  Design of Data Model

   An IGMP/MLD snooping switch [RFC4541] analyzes IGMP/MLD packets and
   sets up forwarding tables for multicast traffic.  If a switch does
   not run IGMP/MLD snooping, multicast traffic will be flooded in the
   broadcast domain.  If a switch runs IGMP/MLD snooping, multicast
   traffic will be forwarded based on the forwarding tables to avoid
   wasting bandwidth.  The IGMP/MLD snooping switch does not need to run
   any of the IGMP/MLD protocols.  Because the IGMP/MLD snooping is
   independent of the IGMP/MLD protocols, the data model defined in this
   document does not augment, or even require, the IGMP/MLD data model
   defined in [RFC8652].  The model covers considerations for IGMP and
   MLD snooping switches [RFC4541].

   IGMP and MLD snooping switches do not adhere to the conceptual model
   that provides the strict separation of functionality between
   different communications layers in the ISO model and instead utilize
   information in the upper-level protocol headers as factors to be
   considered in processing at the lower levels [RFC4541].

   IGMP snooping switches utilize IGMP and could support IGMPv1
   [RFC1112], IGMPv2 [RFC2236], and IGMPv3 [RFC3376].  MLD snooping
   switches utilize MLD and could support MLDv1 [RFC2710] and MLDv2
   [RFC3810].  The goal of this document is to define a data model that
   provides a common user interface to IGMP and MLD snooping.

2.1.  Overview

   The YANG module on IGMP and MLD snooping defined in this document has
   all the common building blocks for the IGMP and MLD snooping
   switches.

   The YANG module includes an IGMP and MLD snooping instance definition
   that uses the instance in the L2 service type of bridge [dot1Qcp].
   It also includes actions for clearing IGMP and MLD snooping group
   tables.

   The YANG module doesn't cover L2VPN, which will be specified in a
   separate document.

2.2.  Optional Capabilities

   This model is designed to represent the basic capability subsets of
   IGMP and MLD snooping.  The main design goals of this document are
   that the basic capabilities described in the model are supported by
   any major now-existing implementation and that the configuration of
   all implementations meeting the specifications is easy to express
   through some combination of the optional features in the model and
   simple vendor augmentations.

   There is also value in widely supported features being standardized
   to provide a standardized way to access these features, to save work
   for individual vendors, and to ensure that mapping between different
   vendors' configuration is not needlessly complicated.  Therefore,
   this model declares a number of features representing capabilities
   that not all deployed devices support.

   The extensive use of feature declarations should also substantially
   simplify the capability negotiation process for a vendor's IGMP and
   MLD snooping implementations.

   On the other hand, operational state parameters are not so widely
   designated as features, as there are many cases where the defaulting
   of an operational state parameter would not cause any harm to the
   system, and it is much more likely that an implementation without
   intrinsic support for a piece of operational state would be able to
   derive a suitable value for a state variable that is not
   intrinsically supported.

2.3.  Position of Address Family in Hierarchy

   IGMP snooping only supports IPv4, while MLD snooping only supports
   IPv6.  The data model defined in this document can be used for both
   IPv4 and IPv6 address families.

   This document defines IGMP snooping and MLD snooping as separate
   schema branches in the structure.  The benefits are:

   *  The model can support IGMP snooping (IPv4), MLD snooping (IPv6),
      or both optionally and independently.  Such flexibility cannot be
      achieved cleanly with a combined branch.

   *  The structure is consistent with other YANG data models such as
      [RFC8652], which uses separate branches for IPv4 and IPv6.

   *  Having separate branches for IGMP snooping and MLD snooping allows
      minor differences in their behavior to be modeled more simply and
      cleanly.  The two branches can better support different features
      and node types.

3.  Module Structure

   This model augments the core routing data model specified in
   [RFC8349].

      +--rw routing
         +--rw router-id?
         +--rw control-plane-protocols
         |  +--rw control-plane-protocol* [type name]
         |     +--rw type
         |     +--rw name
         |     +--rw igmp-snooping-instance <= Augmented by this Model
                        ...
         |     +--rw mld-snooping-instance   <= Augmented by this Model
                        ...

   The "igmp-snooping-instance" container instantiates an IGMP snooping
   instance.  The "mld-snooping-instance" container instantiates an MLD
   snooping instance.

   The YANG data model defined in this document conforms to the NMDA
   [RFC8342].  The operational state data is combined with the
   associated configuration data in the same hierarchy [RFC8407].

3.1.  IGMP Snooping Instances

   The YANG module ietf-igmp-mld-snooping augments /rt:routing/
   rt:control-plane-protocols/rt:control-plane-protocol to add the igmp-
   snooping-instance container.

   All the IGMP snooping-related attributes have been defined in the
   igmp-snooping-instance.  The read-write attributes represent
   configurable data.  The read-only attributes represent state data.

   One igmp-snooping-instance could be used in one bridge [dot1Qcp]
   instance, and it corresponds to one bridge instance.

   Currently, the value of l2-service-type in igmp-snooping-instance
   could only be set to 'bridge'.  After it is set, igmp-snooping-
   instance could be used in the bridge service.

   The values of bridge-mrouter-interface are filled by the snooping
   device dynamically.  It is different from static-bridge-mrouter-
   interface, which is configured.

   The attributes under the interfaces show the statistics of IGMP
   snooping-related packets.

   augment /rt:routing/rt:control-plane-protocols
            /rt:control-plane-protocol:
     +--rw igmp-snooping-instance {igmp-snooping}?
        +--rw l2-service-type?                     l2-service-type
        +--rw enabled?                             boolean
        +--rw forwarding-table-type?               enumeration
        +--rw explicit-tracking?                   boolean
        |       {explicit-tracking}?
        +--rw lite-exclude-filter?                 empty
        |       {lite-exclude-filter}?
        +--rw send-query?                          boolean
        +--rw fast-leave?                          empty {fast-leave}?
        +--rw last-member-query-interval?          uint16
        +--rw query-interval?                      uint16
        +--rw query-max-response-time?             uint16
        +--rw require-router-alert?                boolean
        |       {require-router-alert}?
        +--rw robustness-variable?                 uint8
        +--rw static-bridge-mrouter-interface*     if:interface-ref
        |       {static-mrouter-interface}?
        +--rw igmp-version?                        uint8
        +--rw querier-source?                      inet:ipv4-address
        +--rw static-l2-multicast-group* [group source-addr]
        |       {static-l2-multicast-group}?
        |  +--rw group
        |  |       rt-types:ipv4-multicast-group-address
        |  +--rw source-addr
        |  |       rt-types:ipv4-multicast-source-address
        |  +--rw bridge-outgoing-interface*   if:interface-ref
        +--ro entries-count?                       yang:gauge32
        +--ro bridge-mrouter-interface*            if:interface-ref
        +--ro group* [address]
        |  +--ro address
        |  |       rt-types:ipv4-multicast-group-address
        |  +--ro mac-address?     yang:phys-address
        |  +--ro expire?          rt-types:timer-value-seconds16
        |  +--ro up-time          uint32
        |  +--ro last-reporter?   inet:ipv4-address
        |  +--ro source* [address]
        |     +--ro address
        |     |       rt-types:ipv4-multicast-source-address
        |     +--ro bridge-outgoing-interface*   if:interface-ref
        |     +--ro up-time                      uint32
        |     +--ro expire?
        |     |       rt-types:timer-value-seconds16
        |     +--ro host-count?                  yang:gauge32
        |     |       {explicit-tracking}?
        |     +--ro last-reporter?               inet:ipv4-address
        |     +--ro host* [address] {explicit-tracking}?
        |        +--ro address        inet:ipv4-address
        |        +--ro filter-mode    filter-mode-type
        +--ro interfaces
           +--ro interface* [name]
              +--ro name          if:interface-ref
              +--ro statistics
                 +--ro discontinuity-time?   yang:date-and-time
                 +--ro received
                 |  +--ro query-count?                  yang:counter64
                 |  +--ro membership-report-v1-count?   yang:counter64
                 |  +--ro membership-report-v2-count?   yang:counter64
                 |  +--ro membership-report-v3-count?   yang:counter64
                 |  +--ro leave-count?                  yang:counter64
                 |  +--ro pim-hello-count?              yang:counter64
                 +--ro sent
                    +--ro query-count?                  yang:counter64
                    +--ro membership-report-v1-count?   yang:counter64
                    +--ro membership-report-v2-count?   yang:counter64
                    +--ro membership-report-v3-count?   yang:counter64
                    +--ro leave-count?                  yang:counter64
                    +--ro pim-hello-count?              yang:counter64

3.2.  MLD Snooping Instances

   The YANG module ietf-igmp-mld-snooping augments /rt:routing/
   rt:control-plane-protocols/rt:control-plane-protocol to add the mld-
   snooping-instance container.  The mld-snooping-instance could be used
   in the bridge [dot1Qcp] service to enable MLD snooping.

   All the MLD snooping-related attributes have been defined in the mld-
   snooping-instance.  The read-write attributes represent configurable
   data.  The read-only attributes represent state data.

   The mld-snooping-instance has a similar structure to IGMP snooping.
   Some leaves are protocol related.  The mld-snooping-instance uses
   IPv6 addresses and mld-version, while igmp-snooping-instance uses
   IPv4 addresses and igmp-version.  Statistic counters in each of the
   above snooping instances are also tailored to the specific protocol
   type.  One mld-snooping-instance could be used in one bridge instance
   and corresponds to one bridge instance.

   Currently, the value of l2-service-type in mld-snooping-instance
   could only be set to 'bridge'.  After it is set, mld-snooping-
   instance could be used in the bridge service.

   The value of bridge-mrouter-interface is filled by the snooping
   device dynamically.  It is different from static-bridge-mrouter-
   interface, which is configured.

   The attributes under the interfaces show the statistics of MLD
   snooping-related packets.

   augment /rt:routing/rt:control-plane-protocols
               /rt:control-plane-protocol:
     +--rw mld-snooping-instance {mld-snooping}?
     +--rw l2-service-type?                          l2-service-type
        +--rw enabled?                             boolean
        +--rw forwarding-table-type?               enumeration
        +--rw explicit-tracking?                   boolean
        |       {explicit-tracking}?
        +--rw lite-exclude-filter?                 empty
        |       {lite-exclude-filter}?
        +--rw send-query?                          boolean
        +--rw fast-leave?                          empty {fast-leave}?
        +--rw last-member-query-interval?          uint16
        +--rw query-interval?                      uint16
        +--rw query-max-response-time?             uint16
        +--rw require-router-alert?                boolean
        |       {require-router-alert}?
        +--rw robustness-variable?                 uint8
        +--rw static-bridge-mrouter-interface*     if:interface-ref
        |       {static-mrouter-interface}?
        +--rw mld-version?                         uint8
        +--rw querier-source?                      inet:ipv6-address
        +--rw static-l2-multicast-group* [group source-addr]
        |       {static-l2-multicast-group}?
        |  +--rw group
        |  |       rt-types:ipv6-multicast-group-address
        |  +--rw source-addr
        |  |       rt-types:ipv6-multicast-source-address
        |  +--rw bridge-outgoing-interface*   if:interface-ref
        +--ro entries-count?                       yang:gauge32
        +--ro bridge-mrouter-interface*            if:interface-ref
        +--ro group* [address]
        |  +--ro address
        |  |       rt-types:ipv6-multicast-group-address
        |  +--ro mac-address?     yang:phys-address
        |  +--ro expire?          rt-types:timer-value-seconds16
        |  +--ro up-time          uint32
        |  +--ro last-reporter?   inet:ipv6-address
        |  +--ro source* [address]
        |     +--ro address
        |     |       rt-types:ipv6-multicast-source-address
        |     +--ro bridge-outgoing-interface*   if:interface-ref
        |     +--ro up-time                      uint32
        |     +--ro expire?
        |     |       rt-types:timer-value-seconds16
        |     +--ro host-count?                  yang:gauge32
        |     |       {explicit-tracking}?
        |     +--ro last-reporter?               inet:ipv6-address
        |     +--ro host* [address]       {explicit-tracking}?
        |        +--ro address             inet:ipv6-address
        |        +--ro filter-mode    filter-mode-type
        +--ro interfaces
           +--ro interface* [name]
              +--ro name          if:interface-ref
              +--ro statistics
                 +--ro discontinuity-time?   yang:date-and-time
                 +--ro received
                 |  +--ro query-count?       yang:counter64
                 |  +--ro report-v1-count?   yang:counter64
                 |  +--ro report-v2-count?   yang:counter64
                 |  +--ro done-count?        yang:counter64
                 |  +--ro pim-hello-count?   yang:counter64
                 +--ro sent
                    +--ro query-count?       yang:counter64
                    +--ro report-v1-count?   yang:counter64
                    +--ro report-v2-count?   yang:counter64
                    +--ro done-count?        yang:counter64
                    +--ro pim-hello-count?   yang:counter64

3.3.  Using IGMP and MLD Snooping Instances

   The igmp-snooping-instance could be used in the service of bridge
   [dot1Qcp] to configure the IGMP snooping.

   For the bridge service, this model augments /dot1q:bridges/
   dot1q:bridge to use igmp-snooping-instance.  It means IGMP snooping
   is enabled in the bridge.

   It also augments /dot1q:bridges/dot1q:bridge/dot1q:component/
   dot1q:bridge-vlan/dot1q:vlan to use igmp-snooping-instance.  It means
   IGMP snooping is enabled in the specified VLAN on the bridge.

   The mld-snooping-instance could be used in concurrence with igmp-
   snooping-instance to configure the MLD snooping.

   augment /dot1q:bridges/dot1q:bridge:
     +--rw igmp-snooping-instance?   igmp-mld-snooping-instance-ref
     +--rw mld-snooping-instance?    igmp-mld-snooping-instance-ref

   augment /dot1q:bridges/dot1q:bridge/dot1q:component
             /dot1q:bridge-vlan/dot1q:vlan:
     +--rw igmp-snooping-instance?   igmp-mld-snooping-instance-ref
     +--rw mld-snooping-instance?    igmp-mld-snooping-instance-ref

3.4.  IGMP and MLD Snooping Actions

   IGMP and MLD snooping actions clear the specified IGMP and MLD
   snooping group tables.  If both source X and group Y are specified,
   only source X from group Y in that specific instance will be cleared.

   augment /rt:routing/rt:control-plane-protocols
               /rt:control-plane-protocol:
     +--rw igmp-snooping-instance {igmp-snooping}?
        +---x clear-igmp-snooping-groups {action-clear-groups}?
           +---w input
              +---w group     union
              +---w source    rt-types:ipv4-multicast-source-address

   augment /rt:routing/rt:control-plane-protocols
               /rt:control-plane-protocol:
     +--rw mld-snooping-instance {mld-snooping}?
        +---x clear-mld-snooping-groups {action-clear-groups}?
           +---w input
              +---w group     union
              +---w source    rt-types:ipv6-multicast-source-address

4.  IGMP and MLD Snooping YANG Module

   This module references [RFC1112], [RFC2236], [RFC2710], [RFC3376],
   [RFC3810], [RFC4541], [RFC5790], [RFC6636], [RFC6991], [RFC7761],
   [RFC8343], and [dot1Qcp].

   <CODE BEGINS> file "ietf-igmp-mld-snooping@2022-01-31.yang"
   module ietf-igmp-mld-snooping {
     yang-version 1.1;
     namespace "urn:ietf:params:xml:ns:yang:ietf-igmp-mld-snooping";
     prefix ims;

     import ietf-inet-types {
       prefix inet;
       reference
         "RFC 6991: Common YANG Data Types";
     }
     import ietf-yang-types {
       prefix yang;
       reference
         "RFC 6991: Common YANG Data Types";
     }
     import ietf-interfaces {
       prefix if;
       reference
         "RFC 8343: A YANG Data Model for Interface Management";
     }
     import ietf-routing {
       prefix rt;
       reference
         "RFC 8349: A YANG Data Model for Routing Management (NMDA
          Version)";
     }
     import ietf-routing-types {
       prefix rt-types;
       reference
         "RFC 8294: Common YANG Data Types for the Routing Area";
     }
     import ieee802-dot1q-bridge {
       prefix dot1q;
       reference
         "dot1Qcp: IEEE 802.1Qcp-2018 Standard for Local and
          Metropolitan area networks--Bridges and Bridged Networks
          --Amendment 30: YANG Data Model";
     }

     organization
       "IETF PIM Working Group";
     contact
       "WG Web:   <http://datatracker.ietf.org/wg/pim/>
        WG List:  <mailto:pim@ietf.org>

        Editors:  Hongji Zhao
                  <mailto:hongji.zhao@ericsson.com>

                  Xufeng Liu
                  <mailto:xufeng.liu.ietf@gmail.com>

                  Yisong Liu
                  <mailto:liuyisong@chinamobile.com>

                  Anish Peter
                  <mailto:anish.ietf@gmail.com>

                  Mahesh Sivakumar
                  <mailto:sivakumar.mahesh@gmail.com>

       ";
     description
       "The module defines a collection of YANG definitions common for
        all devices that implement Internet Group Management Protocol
        (IGMP) and Multicast Listener Discovery (MLD) snooping, which is
        described in RFC 4541.

        Copyright (c) 2022 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 Revised 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 9166; see the
        RFC itself for full legal notices.";

     revision 2022-01-31 {
       description
         "Initial revision.";
       reference
         "RFC 9166: A YANG Data Model for Internet Group Management
          Protocol (IGMP) and Multicast Listener Discovery (MLD)
          Snooping";
     }

     /*
      * Features
      */

     feature igmp-snooping {
       description
         "Support IGMP snooping.";
       reference
         "RFC 4541: Considerations for Internet Group Management
          Protocol (IGMP) and Multicast Listener Discovery (MLD)
          Snooping Switches";
     }

     feature mld-snooping {
       description
         "Support MLD snooping.";
       reference
         "RFC 4541: Considerations for Internet Group Management
          Protocol (IGMP) and Multicast Listener Discovery (MLD)
          Snooping Switches";
     }

     feature fast-leave {
       description
         "Support configuration of fast leave.  The fast leave feature
          does not send last member query messages to hosts.";
       reference
         "RFC 3376: Internet Group Management Protocol, Version 3";
     }

     feature static-l2-multicast-group {
       description
         "Support configuration of static L2 multicast group.";
     }

     feature static-mrouter-interface {
       description
         "Support multicast router interface explicitly configured
          by management.";
       reference
         "RFC 4541: Considerations for Internet Group Management
          Protocol (IGMP) and Multicast Listener Discovery (MLD)
          Snooping Switches";
     }

     feature action-clear-groups {
       description
         "Support clearing statistics by action for IGMP and MLD
          snooping.";
     }

     feature require-router-alert {
       description
         "Support configuration of require-router-alert.";
       reference
         "RFC 3376: Internet Group Management Protocol, Version 3";
     }

     feature lite-exclude-filter {
       description
         "Enable the support of the simplified EXCLUDE filter.";
       reference
         "RFC 5790: Lightweight Internet Group Management Protocol
          Version 3 (IGMPv3) and Multicast Listener Discovery Version
          2 (MLDv2) Protocols";
     }

     feature explicit-tracking {
       description
         "Support configuration of per-instance explicit-tracking.";
       reference
         "RFC 6636: Tuning the Behavior of the Internet Group Management
          Protocol (IGMP) and Multicast Listener Discovery (MLD) for
          Routers in Mobile and Wireless Networks";
     }

     /* identities */

     identity l2-service-type {
       description
         "Base identity for L2 service type in IGMP and MLD snooping.";
     }

     identity bridge {
       base l2-service-type;
       description
         "This identity represents bridge service.";
     }

     identity filter-mode {
       description
         "Base identity for filter mode in IGMP and MLD snooping.";
     }

     identity include {
       base filter-mode;
       description
         "This identity represents include mode.";
     }

     identity exclude {
       base filter-mode;
       description
         "This identity represents exclude mode.";
     }

     identity igmp-snooping {
       base rt:control-plane-protocol;
       description
         "IGMP snooping.";
     }

     identity mld-snooping {
       base rt:control-plane-protocol;
       description
         "MLD snooping.";
     }

     /*
      * Typedefs
      */

     typedef l2-service-type {
       type identityref {
         base l2-service-type;
       }
       description
         "The L2 service type used with IGMP and MLD
          snooping.";
     }

     typedef filter-mode-type {
       type identityref {
         base filter-mode;
       }
       description
         "The host filter mode.";
     }

     typedef igmp-mld-snooping-instance-ref {
       type leafref {
         path "/rt:routing/rt:control-plane-protocols"
            + "/rt:control-plane-protocol/rt:name";
       }
       description
         "This type is used by data models that need to
          reference IGMP or MLD snooping instance.";
     }

     /*
      * Groupings
      */

     grouping instance-config-attributes-igmp-mld-snooping {
       description
         "IGMP and MLD snooping configuration of each VLAN.";
       leaf enabled {
         type boolean;
         default "false";
         description
           "Set the value to true to enable IGMP and MLD snooping.";
       }
       leaf forwarding-table-type {
         type enumeration {
           enum mac {
             description
               "MAC-based lookup mode.";
           }
           enum ip {
             description
               "IP-based lookup mode.";
           }
         }
         default "ip";
         description
           "The default forwarding table type is ip.";
       }
       leaf explicit-tracking {
         if-feature "explicit-tracking";
         type boolean;
         default "false";
         description
           "Track the IGMPv3 and MLDv2 snooping membership reports
            from individual hosts.  It contributes to saving network
            resources and shortening leave latency.";
       }
       leaf lite-exclude-filter {
         if-feature "lite-exclude-filter";
         type empty;
         description
           "For IGMP snooping, the presence of this
            leaf enables the support of the simplified EXCLUDE filter
            in the Lightweight IGMPv3 protocol, which simplifies the
            standard versions of IGMPv3.
            For MLD Snooping, the presence of this
            leaf enables the support of the simplified EXCLUDE filter
            in the Lightweight MLDv2 protocol, which simplifies the
            standard versions of MLDv2.";
         reference
           "RFC 5790: Lightweight Internet Group Management Protocol
            Version 3 (IGMPv3) and Multicast Listener Discovery Version
            2 (MLDv2) Protocols";
       }
       leaf send-query {
         type boolean;
         default "false";
         description
           "When it is true, this switch will send out a periodic IGMP
            General Query Message or MLD General Query Message.";
       }
       leaf fast-leave {
         if-feature "fast-leave";
         type empty;
         description
           "When fast leave is enabled, the software assumes
            that no more than one host is present on each VLAN port.";
       }
       leaf last-member-query-interval {
         type uint16 {
           range "10..10230";
         }
         units "deciseconds";
         default "10";
         description
           "Last Member Query Interval, which may be tuned to modify
            the leave latency of the network.
            It is represented in units of 1/10 second.";
         reference
           "RFC 3376: Internet Group Management Protocol, Version 3,
            Section 8.8";
       }
       leaf query-interval {
         type uint16;
         units "seconds";
         default "125";
         description
           "The Query Interval is the interval between General Queries
            sent by the Querier.";
         reference
           "RFC 3376: Internet Group Management Protocol, Version 3,
            Sections 4.1.7, 8.2, and 8.14.2";
       }
       leaf query-max-response-time {
         type uint16;
         units "deciseconds";
         default "100";
         description
           "Query maximum response time specifies the maximum time
            allowed before sending a responding report.
            It is represented in units of 1/10 second.";
         reference
           "RFC 3376: Internet Group Management Protocol, Version 3,
            Sections 4.1.1, 8.3, and 8.14.3";
       }
       leaf require-router-alert {
         if-feature "require-router-alert";
         type boolean;
         default "false";
         description
           "When the value is true, a router alert should exist
            in the IP header of the IGMP or MLD packet.  If it
            doesn't exist, the IGMP or MLD packet will be ignored.";
         reference
           "RFC 3376: Internet Group Management Protocol, Version 3,
            Sections 9.1, 9.2, and 9.3";
       }
       leaf robustness-variable {
         type uint8 {
           range "1..7";
         }
         default "2";
         description
           "Querier's Robustness Variable allows tuning for the
            expected packet loss on a network.";
         reference
           "RFC 3376: Internet Group Management Protocol, Version 3,
            Sections 4.1.6, 8.1, and 8.14.1";
       }
       leaf-list static-bridge-mrouter-interface {
         when 'derived-from-or-self(../l2-service-type,"ims:bridge")';
         if-feature "static-mrouter-interface";
         type if:interface-ref;
         description
           "Static mrouter interface in bridge forwarding";
       }
     } // instance-config-attributes-igmp-mld-snooping

     grouping instance-state-group-attributes-igmp-mld-snooping {
       description
         "Attributes for both IGMP and MLD snooping groups.";
       leaf mac-address {
         type yang:phys-address;
         description
           "Destination MAC address for L2 multicast.";
       }
       leaf expire {
         type rt-types:timer-value-seconds16;
         units "seconds";
         description
           "The time left before multicast group timeout.";
       }
       leaf up-time {
         type uint32;
         units "seconds";
         mandatory true;
         description
           "The time elapsed since the L2 multicast record was
            created.";
       }
     } // instance-state-group-attributes-igmp-mld-snooping

     grouping instance-state-attributes-igmp-mld-snooping {
       description
         "State attributes for IGMP or MLD snooping instance.";
       leaf entries-count {
         type yang:gauge32;
         config false;
         description
           "The number of L2 multicast entries in IGMP and MLD
            snooping.";
       }
       leaf-list bridge-mrouter-interface {
         when 'derived-from-or-self(../l2-service-type,"ims:bridge")';
         type if:interface-ref;
         config false;
         description
           "Indicates a list of mrouter interfaces dynamically learned
            in a bridge.  When this switch receives IGMP/MLD queries
            from a multicast router on an interface, the interface will
            become an mrouter interface for IGMP/MLD snooping.";
       }
     } // instance-config-attributes-igmp-mld-snooping

     grouping instance-state-source-attributes-igmp-mld-snooping {
       description
         "State attributes for IGMP or MLD snooping instance.";
       leaf-list bridge-outgoing-interface {
         when 'derived-from-or-self(../../../l2-service-type,
               "ims:bridge")';
         type if:interface-ref;
         description
           "Outgoing interface in bridge forwarding.";
       }
       leaf up-time {
         type uint32;
         units "seconds";
         mandatory true;
         description
           "The time elapsed since L2 multicast record was created.";
       }
       leaf expire {
         type rt-types:timer-value-seconds16;
         units "seconds";
         description
           "The time left before multicast group timeout.";
       }
       leaf host-count {
         if-feature "explicit-tracking";
         type yang:gauge32;
         description
           "The number of host addresses.";
       }
     } // instance-state-source-attributes-igmp-mld-snooping

     grouping igmp-snooping-statistics {
       description
         "The statistics attributes for IGMP snooping.";
       leaf query-count {
         type yang:counter64;
         description
           "The number of Membership Query messages.";
         reference
           "RFC 2236: Internet Group Management Protocol, Version 2";
       }
       leaf membership-report-v1-count {
         type yang:counter64;
         description
           "The number of Version 1 Membership Report messages.";
         reference
           "RFC 1112: Host extensions for IP multicasting";
       }
       leaf membership-report-v2-count {
         type yang:counter64;
         description
           "The number of Version 2 Membership Report messages.";
         reference
           "RFC 2236: Internet Group Management Protocol, Version 2";
       }
       leaf membership-report-v3-count {
         type yang:counter64;
         description
           "The number of Version 3 Membership Report messages.";
         reference
           "RFC 3376: Internet Group Management Protocol, Version 3";
       }
       leaf leave-count {
         type yang:counter64;
         description
           "The number of Leave Group messages.";
         reference
           "RFC 2236: Internet Group Management Protocol, Version 2";
       }
       leaf pim-hello-count {
         type yang:counter64;
         description
           "The number of PIM hello messages.";
         reference
           "RFC 7761: Protocol Independent Multicast - Sparse Mode
            (PIM-SM): Protocol Specification (Revised)";
       }
     } // igmp-snooping-statistics

     grouping mld-snooping-statistics {
       description
         "The statistics attributes for MLD snooping.";
       leaf query-count {
         type yang:counter64;
         description
           "The number of Multicast Listener Query messages.";
         reference
           "RFC 3810: Multicast Listener Discovery Version 2 (MLDv2)
            for IPv6";
       }
       leaf report-v1-count {
         type yang:counter64;
         description
           "The number of Version 1 Multicast Listener Report.";
         reference
           "RFC 2710: Multicast Listener Discovery (MLD) for IPv6";
       }
       leaf report-v2-count {
         type yang:counter64;
         description
           "The number of Version 2 Multicast Listener Report.";
         reference
           "RFC 3810: Multicast Listener Discovery Version 2 (MLDv2)
            for IPv6";
       }
       leaf done-count {
         type yang:counter64;
         description
           "The number of Version 1 Multicast Listener Done.";
         reference
           "RFC 2710: Multicast Listener Discovery (MLD) for IPv6";
       }
       leaf pim-hello-count {
         type yang:counter64;
         description
           "The number of PIM hello messages.";
         reference
           "RFC 7761: Protocol Independent Multicast - Sparse Mode
            (PIM-SM): Protocol Specification (Revised)";
       }
     } // mld-snooping-statistics

     augment "/rt:routing/rt:control-plane-protocols"
           + "/rt:control-plane-protocol" {
       when 'derived-from-or-self(rt:type, "ims:igmp-snooping")' {
         description
           "This container is only valid for IGMP snooping.";
       }
       description
         "IGMP snooping augmentation to control-plane protocol
          configuration and state.";
       container igmp-snooping-instance {
         if-feature "igmp-snooping";
         description
           "IGMP snooping instance to configure igmp-snooping.";
         leaf l2-service-type {
           type l2-service-type;
           default "bridge";
           description
             "It indicates bridge or other services.";
         }
         uses instance-config-attributes-igmp-mld-snooping;
         leaf igmp-version {
           type uint8 {
             range "1..3";
           }
           default "2";
           description
             "IGMP version.";
         }
         leaf querier-source {
           type inet:ipv4-address;
           description
             "The source address of the IGMP General Query message,
              which is sent out by this switch.";
         }
         list static-l2-multicast-group {
           if-feature "static-l2-multicast-group";
           key "group source-addr";
           description
             "A static multicast route, (*,G) or (S,G).";
           leaf group {
             type rt-types:ipv4-multicast-group-address;
             description
               "Multicast group IPv4 address.";
           }
           leaf source-addr {
             type rt-types:ipv4-multicast-source-address;
             description
               "Multicast source IPv4 address.";
           }
           leaf-list bridge-outgoing-interface {
             when 'derived-from-or-self(../../l2-service-type,
                   "ims:bridge")';
             type if:interface-ref;
             description
               "Outgoing interface in bridge forwarding.";
           }
         } // static-l2-multicast-group
         uses instance-state-attributes-igmp-mld-snooping;
         list group {
           key "address";
           config false;
           description
             "IGMP snooping information.";
           leaf address {
             type rt-types:ipv4-multicast-group-address;
             description
               "Multicast group IPv4 address.";
           }
           uses instance-state-group-attributes-igmp-mld-snooping;
           leaf last-reporter {
             type inet:ipv4-address;
             description
               "Address of the last host that has sent a report to join
                the multicast group.";
           }
           list source {
             key "address";
             description
               "Source IPv4 address for multicast stream.";
             leaf address {
               type rt-types:ipv4-multicast-source-address;
               description
                 "Source IPv4 address for multicast stream.";
             }
             uses instance-state-source-attributes-igmp-mld-snooping;
             leaf last-reporter {
               type inet:ipv4-address;
               description
                 "Address of the last host that has sent a report
                  to join the multicast group.";
             }
             list host {
               if-feature "explicit-tracking";
               key "address";
               description
                 "List of multicast membership hosts
                  of the specific multicast source group.";
               leaf address {
                 type inet:ipv4-address;
                 description
                   "Multicast membership host address.";
               }
               leaf filter-mode {
                 type filter-mode-type;
                 mandatory true;
                 description
                   "Filter mode for a multicast membership
                    host may be either include or exclude.";
               }
             } // list host
           } // list source
         } // list group
         container interfaces {
           config false;
           description
             "Contains the interfaces associated with the IGMP snooping
              instance.";
           list interface {
             key "name";
             description
               "A list of interfaces associated with the IGMP snooping
                instance.";
             leaf name {
               type if:interface-ref;
               description
                 "The name of the interface.";
             }
             container statistics {
               description
                 "The interface statistics for IGMP snooping.";
               leaf discontinuity-time {
                 type yang:date-and-time;
                 description
                   "The time on the most recent occasion at which any
                    one or more of the statistic 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.";
               }
               container received {
                 description
                   "Number of received snooped IGMP packets.";
                 uses igmp-snooping-statistics;
               }
               container sent {
                 description
                   "Number of sent snooped IGMP packets.";
                 uses igmp-snooping-statistics;
               }
             }
           }
         }
         action clear-igmp-snooping-groups {
           if-feature "action-clear-groups";
           description
             "Clear IGMP snooping cache tables.";
           input {
             leaf group {
               type union {
                 type enumeration {
                   enum all-groups {
                     description
                       "All multicast group addresses.";
                   }
                 }
                 type rt-types:ipv4-multicast-group-address;
               }
               mandatory true;
               description
                 "Multicast group IPv4 address.  If value
                  'all-groups' is specified, all IGMP snooping
                  group entries are cleared for the specified source
                  address.";
             }
             leaf source {
               type rt-types:ipv4-multicast-source-address;
               mandatory true;
               description
                 "Multicast source IPv4 address.  If value '*' is
                  specified, all IGMP snooping source-group tables
                  are cleared.";
             }
           }
         } // action clear-igmp-snooping-groups
       } // igmp-snooping-instance
     } // augment

     augment "/rt:routing/rt:control-plane-protocols"
           + "/rt:control-plane-protocol" {
       when 'derived-from-or-self(rt:type, "ims:mld-snooping")' {
         description
           "This container is only valid for MLD snooping.";
       }
       description
         "MLD snooping augmentation to control-plane protocol
          configuration and state.";
       container mld-snooping-instance {
         if-feature "mld-snooping";
         description
           "MLD snooping instance to configure mld-snooping.";
         leaf l2-service-type {
           type l2-service-type;
           default "bridge";
           description
             "It indicates bridge or other services.";
         }
         uses instance-config-attributes-igmp-mld-snooping;
         leaf mld-version {
           type uint8 {
             range "1..2";
           }
           default "2";
           description
             "MLD version.";
         }
         leaf querier-source {
           type inet:ipv6-address;
           description
             "The source address of MLD General Query message, which
              is sent out by this switch.";
         }
         list static-l2-multicast-group {
           if-feature "static-l2-multicast-group";
           key "group source-addr";
           description
             "A static multicast route, (*,G) or (S,G).";
           leaf group {
             type rt-types:ipv6-multicast-group-address;
             description
               "Multicast group IPv6 address.";
           }
           leaf source-addr {
             type rt-types:ipv6-multicast-source-address;
             description
               "Multicast source IPv6 address.";
           }
           leaf-list bridge-outgoing-interface {
             when 'derived-from-or-self(../../l2-service-type,
                   "ims:bridge")';
             type if:interface-ref;
             description
               "Outgoing interface in bridge forwarding.";
           }
         } // static-l2-multicast-group
         uses instance-state-attributes-igmp-mld-snooping;
         list group {
           key "address";
           config false;
           description
             "MLD snooping statistics information.";
           leaf address {
             type rt-types:ipv6-multicast-group-address;
             description
               "Multicast group IPv6 address.";
           }
           uses instance-state-group-attributes-igmp-mld-snooping;
           leaf last-reporter {
             type inet:ipv6-address;
             description
               "Address of the last host that has sent report
                to join the multicast group.";
           }
           list source {
             key "address";
             description
               "Source IPv6 address for multicast stream.";
             leaf address {
               type rt-types:ipv6-multicast-source-address;
               description
                 "Source IPv6 address for multicast stream.";
             }
             uses instance-state-source-attributes-igmp-mld-snooping;
             leaf last-reporter {
               type inet:ipv6-address;
               description
                 "Address of the last host that has sent report
                  to join the multicast group.";
             }
             list host {
               if-feature "explicit-tracking";
               key "address";
               description
                 "List of multicast membership hosts
                  of the specific multicast source group.";
               leaf address {
                 type inet:ipv6-address;
                 description
                   "Multicast membership host address.";
               }
               leaf filter-mode {
                 type filter-mode-type;
                 mandatory true;
                 description
                   "Filter mode for a multicast membership
                    host may be either include or exclude.";
               }
             } // list host
           } // list source
         } // list group
         container interfaces {
           config false;
           description
             "Contains the interfaces associated with the MLD snooping
              instance.";
           list interface {
             key "name";
             description
               "A list of interfaces associated with the MLD snooping
                instance.";
             leaf name {
               type if:interface-ref;
               description
                 "The name of the interface.";
             }
             container statistics {
               description
                 "The interface statistics for MLD snooping.";
               leaf discontinuity-time {
                 type yang:date-and-time;
                 description
                   "The time on the most recent occasion at which
                    any one or more of the statistic 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.";
               }
               container received {
                 description
                   "Number of received snooped MLD packets.";
                 uses mld-snooping-statistics;
               }
               container sent {
                 description
                   "Number of sent snooped MLD packets.";
                 uses mld-snooping-statistics;
               }
             }
           }
         }
         action clear-mld-snooping-groups {
           if-feature "action-clear-groups";
           description
             "Clear MLD snooping cache tables.";
           input {
             leaf group {
               type union {
                 type enumeration {
                   enum all-groups {
                     description
                       "All multicast group addresses.";
                   }
                 }
                 type rt-types:ipv6-multicast-group-address;
               }
               mandatory true;
               description
                 "Multicast group IPv6 address.  If value 'all-groups'
                  is specified, all MLD snooping group entries are
                  cleared for the specified source address.";
             }
             leaf source {
               type rt-types:ipv6-multicast-source-address;
               mandatory true;
               description
                 "Multicast source IPv6 address.  If value '*' is
                  specified, all MLD snooping source-group tables
                  are cleared.";
             }
           }
         } // action clear-mld-snooping-groups
       } // mld-snooping-instance
     } // augment

     augment "/dot1q:bridges/dot1q:bridge" {
       description
         "Use IGMP or MLD snooping instance in bridge.";
       leaf igmp-snooping-instance {
         type igmp-mld-snooping-instance-ref;
         description
           "Configure IGMP snooping instance under bridge view.";
       }
       leaf mld-snooping-instance {
         type igmp-mld-snooping-instance-ref;
         description
           "Configure MLD snooping instance under bridge view.";
       }
     }

     augment "/dot1q:bridges/dot1q:bridge"
           + "/dot1q:component/dot1q:bridge-vlan/dot1q:vlan" {
       description
         "Use IGMP or MLD snooping instance in a certain VLAN
          of bridge.";
       leaf igmp-snooping-instance {
         type igmp-mld-snooping-instance-ref;
         description
           "Configure IGMP snooping instance under VLAN view.";
       }
       leaf mld-snooping-instance {
         type igmp-mld-snooping-instance-ref;
         description
           "Configure MLD snooping instance under VLAN view.";
       }
     }
   }
   <CODE ENDS>

5.  Security Considerations

   The YANG module specified in this document defines a schema for data
   that is designed to be accessed via network management protocols such
   as NETCONF [RFC6241] or RESTCONF [RFC8040].  The lowest NETCONF layer
   is the secure transport layer, and the mandatory-to-implement secure
   transport is Secure Shell (SSH) [RFC6242].  The lowest RESTCONF layer
   is HTTPS, and the mandatory-to-implement secure transport is TLS
   [RFC8446].

   The Network Configuration Access Control Model (NACM) [RFC8341]
   provides the means to restrict access for particular NETCONF or
   RESTCONF users to a preconfigured subset of all available NETCONF or
   RESTCONF protocol operations and content.

   There are a number of data nodes defined in this YANG module that are
   writable/creatable/deletable (i.e., config true, which is the
   default).  These data nodes may be considered sensitive or vulnerable
   in some network environments.  Write operations (e.g., edit-config)
   to these data nodes without proper protection can have a negative
   effect on network operations.  These are the subtrees and data nodes
   and their sensitivity/vulnerability:

   Under /rt:routing/rt:control-plane-protocols/rt:control-plane-
   protocol:/

      ims:igmp-snooping-instance

      ims:mld-snooping-instance

   The subtrees under /dot1q:bridges/dot1q:bridge

      ims:igmp-snooping-instance

      ims:mld-snooping-instance

   The subtrees under /dot1q:bridges/dot1q:bridge/dot1q:component/
   dot1q:bridge-vlan/dot1q:vlan

      ims:igmp-snooping-instance

      ims:mld-snooping-instance

   Unauthorized access to any data node of these subtrees can adversely
   affect the IGMP and MLD snooping subsystem of both the local device
   and the network.  This may lead to network malfunctions, delivery of
   packets to inappropriate destinations, and other problems.

   Some of the readable data nodes in this YANG module may be considered
   sensitive or vulnerable in some network environments.  It is thus
   important to control read access (e.g., via get, get-config, or
   notification) to these data nodes.  These are the subtrees and data
   nodes and their sensitivity/vulnerability:

   Under /rt:routing/rt:control-plane-protocols/rt:control-plane-
   protocol:/

      ims:igmp-snooping-instance

      ims:mld-snooping-instance

   Unauthorized access to any data node of these subtrees can disclose
   the operational state information of IGMP and MLD snooping on this
   device.  The group/source/host information may expose multicast group
   memberships and, transitively, the associations between the user on
   the host and the contents from the source, which could be privately
   sensitive.  Some of the action operations in this YANG module may be
   considered sensitive or vulnerable in some network environments.  It
   is thus important to control access to these operations.  These are
   the operations and their sensitivity/vulnerability:

   Under /rt:routing/rt:control-plane-protocols/rt:control-plane-
   protocol:/

      ims:igmp-snooping-instance/ims:clear-igmp-snooping-groups

      ims:mld-snooping-instance/ims:clear-mld-snooping-groups

   Some of the actions in this YANG module may be considered sensitive
   or vulnerable in some network environments.  The IGMP and MLD
   snooping YANG module supports the "clear-igmp-snooping-groups" and
   "clear-mld-snooping-groups" actions.  If unauthorized action is
   invoked, the IGMP and MLD snooping group tables will be cleared
   unexpectedly.  Especially when using wildcard, all the multicast
   traffic will be flooded in the broadcast domain.  The devices that
   use this YANG module should heed the security considerations in
   [RFC4541].

6.  IANA Considerations

6.1.  XML Registry

   This document registers the following namespace URI in the "IETF XML
   Registry" [RFC3688]:

   URI:  urn:ietf:params:xml:ns:yang:ietf-igmp-mld-snooping
   Registrant Contact:  The IETF.
   XML:  N/A; the requested URI is an XML namespace.

6.2.  YANG Module Names Registry

   This document registers the following YANG module in the "YANG Module
   Names" registry [RFC7950]:

   Name:         ietf-igmp-mld-snooping
   Namespace:    urn:ietf:params:xml:ns:yang:ietf-igmp-mld-snooping
   Prefix:       ims
   Reference:    RFC 9166

7.  References

7.1.  Normative References

   [dot1Qcp]  IEEE, "Standard for Local and metropolitan area networks--
              Bridges and Bridged Networks--Amendment 30: YANG Data
              Model", IEEE Std 802.1Qcp-2018,
              DOI 10.1109/IEEESTD.2018.8467507, September 2018,
              <https://ieeexplore.ieee.org/servlet/
              opac?punumber=8467505>.

   [RFC1112]  Deering, S., "Host extensions for IP multicasting", STD 5,
              RFC 1112, DOI 10.17487/RFC1112, August 1989,
              <https://www.rfc-editor.org/info/rfc1112>.

   [RFC2236]  Fenner, W., "Internet Group Management Protocol, Version
              2", RFC 2236, DOI 10.17487/RFC2236, November 1997,
              <https://www.rfc-editor.org/info/rfc2236>.

   [RFC2710]  Deering, S., Fenner, W., and B. Haberman, "Multicast
              Listener Discovery (MLD) for IPv6", RFC 2710,
              DOI 10.17487/RFC2710, October 1999,
              <https://www.rfc-editor.org/info/rfc2710>.

   [RFC3376]  Cain, B., Deering, S., Kouvelas, I., Fenner, B., and A.
              Thyagarajan, "Internet Group Management Protocol, Version
              3", RFC 3376, DOI 10.17487/RFC3376, October 2002,
              <https://www.rfc-editor.org/info/rfc3376>.

   [RFC3688]  Mealling, M., "The IETF XML Registry", BCP 81, RFC 3688,
              DOI 10.17487/RFC3688, January 2004,
              <https://www.rfc-editor.org/info/rfc3688>.

   [RFC3810]  Vida, R., Ed. and L. Costa, Ed., "Multicast Listener
              Discovery Version 2 (MLDv2) for IPv6", RFC 3810,
              DOI 10.17487/RFC3810, June 2004,
              <https://www.rfc-editor.org/info/rfc3810>.

   [RFC4286]  Haberman, B. and J. Martin, "Multicast Router Discovery",
              RFC 4286, DOI 10.17487/RFC4286, December 2005,
              <https://www.rfc-editor.org/info/rfc4286>.

   [RFC4541]  Christensen, M., Kimball, K., and F. Solensky,
              "Considerations for Internet Group Management Protocol
              (IGMP) and Multicast Listener Discovery (MLD) Snooping
              Switches", RFC 4541, DOI 10.17487/RFC4541, May 2006,
              <https://www.rfc-editor.org/info/rfc4541>.

   [RFC5790]  Liu, H., Cao, W., and H. Asaeda, "Lightweight Internet
              Group Management Protocol Version 3 (IGMPv3) and Multicast
              Listener Discovery Version 2 (MLDv2) Protocols", RFC 5790,
              DOI 10.17487/RFC5790, February 2010,
              <https://www.rfc-editor.org/info/rfc5790>.

   [RFC6020]  Bjorklund, M., Ed., "YANG - A Data Modeling Language for
              the Network Configuration Protocol (NETCONF)", RFC 6020,
              DOI 10.17487/RFC6020, October 2010,
              <https://www.rfc-editor.org/info/rfc6020>.

   [RFC6241]  Enns, R., Ed., Bjorklund, M., Ed., Schoenwaelder, J., Ed.,
              and A. Bierman, Ed., "Network Configuration Protocol
              (NETCONF)", RFC 6241, DOI 10.17487/RFC6241, June 2011,
              <https://www.rfc-editor.org/info/rfc6241>.

   [RFC6242]  Wasserman, M., "Using the NETCONF Protocol over Secure
              Shell (SSH)", RFC 6242, DOI 10.17487/RFC6242, June 2011,
              <https://www.rfc-editor.org/info/rfc6242>.

   [RFC6636]  Asaeda, H., Liu, H., and Q. Wu, "Tuning the Behavior of
              the Internet Group Management Protocol (IGMP) and
              Multicast Listener Discovery (MLD) for Routers in Mobile
              and Wireless Networks", RFC 6636, DOI 10.17487/RFC6636,
              May 2012, <https://www.rfc-editor.org/info/rfc6636>.

   [RFC6991]  Schoenwaelder, J., Ed., "Common YANG Data Types",
              RFC 6991, DOI 10.17487/RFC6991, July 2013,
              <https://www.rfc-editor.org/info/rfc6991>.

   [RFC7761]  Fenner, B., Handley, M., Holbrook, H., Kouvelas, I.,
              Parekh, R., Zhang, Z., and L. Zheng, "Protocol Independent
              Multicast - Sparse Mode (PIM-SM): Protocol Specification
              (Revised)", STD 83, RFC 7761, DOI 10.17487/RFC7761, March
              2016, <https://www.rfc-editor.org/info/rfc7761>.

   [RFC7950]  Bjorklund, M., Ed., "The YANG 1.1 Data Modeling Language",
              RFC 7950, DOI 10.17487/RFC7950, August 2016,
              <https://www.rfc-editor.org/info/rfc7950>.

   [RFC8040]  Bierman, A., Bjorklund, M., and K. Watsen, "RESTCONF
              Protocol", RFC 8040, DOI 10.17487/RFC8040, January 2017,
              <https://www.rfc-editor.org/info/rfc8040>.

   [RFC8294]  Liu, X., Qu, Y., Lindem, A., Hopps, C., and L. Berger,
              "Common YANG Data Types for the Routing Area", RFC 8294,
              DOI 10.17487/RFC8294, December 2017,
              <https://www.rfc-editor.org/info/rfc8294>.

   [RFC8340]  Bjorklund, M. and L. Berger, Ed., "YANG Tree Diagrams",
              BCP 215, RFC 8340, DOI 10.17487/RFC8340, March 2018,
              <https://www.rfc-editor.org/info/rfc8340>.

   [RFC8341]  Bierman, A. and M. Bjorklund, "Network Configuration
              Access Control Model", STD 91, RFC 8341,
              DOI 10.17487/RFC8341, March 2018,
              <https://www.rfc-editor.org/info/rfc8341>.

   [RFC8342]  Bjorklund, M., Schoenwaelder, J., Shafer, P., Watsen, K.,
              and R. Wilton, "Network Management Datastore Architecture
              (NMDA)", RFC 8342, DOI 10.17487/RFC8342, March 2018,
              <https://www.rfc-editor.org/info/rfc8342>.

   [RFC8343]  Bjorklund, M., "A YANG Data Model for Interface
              Management", RFC 8343, DOI 10.17487/RFC8343, March 2018,
              <https://www.rfc-editor.org/info/rfc8343>.

   [RFC8349]  Lhotka, L., Lindem, A., and Y. Qu, "A YANG Data Model for
              Routing Management (NMDA Version)", RFC 8349,
              DOI 10.17487/RFC8349, March 2018,
              <https://www.rfc-editor.org/info/rfc8349>.

   [RFC8446]  Rescorla, E., "The Transport Layer Security (TLS) Protocol
              Version 1.3", RFC 8446, DOI 10.17487/RFC8446, August 2018,
              <https://www.rfc-editor.org/info/rfc8446>.

7.2.  Informative References

   [RFC7951]  Lhotka, L., "JSON Encoding of Data Modeled with YANG",
              RFC 7951, DOI 10.17487/RFC7951, August 2016,
              <https://www.rfc-editor.org/info/rfc7951>.

   [RFC8407]  Bierman, A., "Guidelines for Authors and Reviewers of
              Documents Containing YANG Data Models", BCP 216, RFC 8407,
              DOI 10.17487/RFC8407, October 2018,
              <https://www.rfc-editor.org/info/rfc8407>.

   [RFC8652]  Liu, X., Guo, F., Sivakumar, M., McAllister, P., and A.
              Peter, "A YANG Data Model for the Internet Group
              Management Protocol (IGMP) and Multicast Listener
              Discovery (MLD)", RFC 8652, DOI 10.17487/RFC8652, November
              2019, <https://www.rfc-editor.org/info/rfc8652>.

Appendix A.  Data Tree Example

   This section contains an example of bridge service in the JSON
   encoding [RFC7951], containing both configuration and state data.

              +-----------+
              +  Source   +
              +-----+-----+
                    |
   -----------------+----------------------------
                    |eth1/1
                +---+---+
                +  R1   +
                +-+---+-+
           eth1/2 |    \ eth1/3
                  |     \
                  |      \
                  |       \
                  |        \
           eth2/1 |         \ eth3/1
              +---+---+   +--+---+
              +  R2   +   +  R3  +
              +---+---+   +--+---+
           eth2/2 |          | eth3/2
                  |          |
   ---------------+----------+-------------------
                  |          |
                  |          |
         +--------+--+   +---+--------+
         + Receiver1 +   +  Receiver2 +
         +-----------+   +------------+

   The configuration data for R1 in the above figure could be as
   follows:

   {
   "ietf-interfaces:interfaces":{
     "interface":[
      {
       "name":"eth1/1",
       "type":"iana-if-type:ethernetCsmacd"
      }
     ]
    },
    "ietf-routing:routing":{
     "control-plane-protocols":{
      "control-plane-protocol":[
       {
        "type":"ietf-igmp-mld-snooping:igmp-snooping",
        "name":"bis1",
        "ietf-igmp-mld-snooping:igmp-snooping-instance":{
          "l2-service-type":"ietf-igmp-mld-snooping:bridge",
          "enabled":true
        }
       }
      ]
     }
    },
    "ieee802-dot1q-bridge:bridges":{
     "bridge":[
      {
       "name":"isp1",
       "address":"00-23-ef-a5-77-12",
       "bridge-type":"ieee802-dot1q-bridge:customer-vlan-bridge",
       "component":[
        {
         "name":"comp1",
         "type":"ieee802-dot1q-bridge:c-vlan-component",
         "bridge-vlan":{
          "vlan":[
           {
            "vid":101,
            "ietf-igmp-mld-snooping:igmp-snooping-instance":"bis1"
           }
          ]
         }
        }
       ]
      }
     ]
    }
   }

   The corresponding operational state data for R1 could be as follows:

   {
    "ietf-interfaces:interfaces": {
     "interface": [
      {
       "name": "eth1/1",
       "type": "iana-if-type:ethernetCsmacd",
       "oper-status": "up",
       "statistics": {
        "discontinuity-time": "2018-05-23T12:34:56-05:00"
       }
      }
     ]
    },
    "ietf-routing:routing": {
     "control-plane-protocols": {
      "control-plane-protocol": [
       {
        "type": "ietf-igmp-mld-snooping:igmp-snooping",
        "name": "bis1",
        "ietf-igmp-mld-snooping:igmp-snooping-instance": {
         "l2-service-type": "ietf-igmp-mld-snooping:bridge",
         "enabled": true
        }
       }
      ]
     }
    },
    "ieee802-dot1q-bridge:bridges": {
     "bridge": [
      {
       "name": "isp1",
       "address": "00-23-ef-a5-77-12",
       "bridge-type": "ieee802-dot1q-bridge:customer-vlan-bridge",
       "component": [
        {
         "name": "comp1",
         "type": "ieee802-dot1q-bridge:c-vlan-component",
         "bridge-vlan": {
          "vlan": [
           {
            "vid": 101,
            "ietf-igmp-mld-snooping:igmp-snooping-instance": "bis1"
           }
          ]
         }
        }
       ]
      }
     ]
    }
   }

   The following action is to clear all the entries whose group address
   is 225.1.1.1 for igmp-snooping-instance bis1.

   POST /restconf/operations/ietf-routing:routing/\
   control-plane-protocols/\
   control-plane-protocol=ietf-igmp-mld-snooping:igmp-snooping,bis1/\
   ietf-igmp-mld-snooping:igmp-snooping-instance/\
   clear-igmp-snooping-groups HTTP/1.1
   Host: example.com
   Content-Type: application/yang-data+json

   {
     "ietf-igmp-mld-snooping:input" : {
       "group": "225.1.1.1",
       "source": "*"
     }
   }

Authors' Addresses

   Hongji Zhao
   Ericsson (China) Communications Company Ltd.
   Ericsson Tower, No. 5 Lize East Street
   Beijing
   100102
   China

   Email: hongji.zhao@ericsson.com


   Xufeng Liu
   IBM Corporation
   2300 Dulles Station Blvd.
   Herndon, VA 20171
   United States of America

   Email: xufeng.liu.ietf@gmail.com


   Yisong Liu
   China Mobile
   China

   Email: liuyisong@chinamobile.com


   Anish Peter
   Individual

   Email: anish.ietf@gmail.com


   Mahesh Sivakumar
   Juniper Networks
   1133 Innovation Way
   Sunnyvale, CA
   United States of America

   Email: sivakumar.mahesh@gmail.com