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<rfc xmlns:xi="http://www.w3.org/2001/XInclude" category="std" docName="draft-ietf-bess-evpn-igmp-mld-proxy-21">  docName="draft-ietf-bess-evpn-igmp-mld-proxy-21" obsoletes="" updates="" submissionType="IETF" consensus="true" ipr="trust200902" xml:lang="en" tocInclude="true" tocDepth="6" symRefs="true" sortRefs="true" version="3" number="9251">
  <!-- ***** FRONT MATTER ***** xml2rfc v2v3 conversion 3.12.2 -->

  <front>
    <title abbrev="IGMP and MLD Proxy Proxies for EVPN">IGMP EVPN"> Internet Group Management Protocol (IGMP) and MLD Proxy Multicast Listener Discovery (MLD) Proxies for EVPN</title> Ethernet VPN (EVPN)</title>
    <seriesInfo name="RFC" value="9251"/>
    <author initials="A" surname="Sajassi" fullname="Ali Sajassi">
      <organization>Cisco Systems</organization>
      <address>
        <postal>
          <street>821 Alder Drive,</street>

        <region>MILPITAS, CALIFORNIA 95035</region>

        <country>UNITED STATES</country> Drive</street>
	  <code>95035</code>
	  <city>Milpitas</city>
          <region>CA</region>
          <country>United States of America</country>
        </postal>

       <phone></phone>
        <phone/>
        <email>sajassi@cisco.com</email>
      </address>
    </author>
    <author initials="S" surname="Thoria" fullname="Samir Thoria">
      <organization>Cisco Systems</organization>
      <address>
        <postal>
          <street>821 Alder Drive,</street>

                <region>MILPITAS, CALIFORNIA 95035</region>

                <country>UNITED STATES</country> Drive</street>
	  <code>95035</code>
	  <city>Milpitas</city>
          <region>CA</region>
          <country>United States of America</country>
        </postal>

            <phone></phone>
        <phone/>
        <email>sthoria@cisco.com</email>
      </address>
    </author>
    <author initials="M" surname="Mishra" fullname="Mankamana Mishra">
      <organization>Cisco Systems</organization>
      <address>
        <postal>
          <street>821 Alder Drive,</street>

                <region>MILPITAS, CALIFORNIA 95035</region>

                <country>UNITED STATES</country> Drive</street>
	  <code>95035</code>
	  <city>Milpitas</city>
          <region>CA</region>
          <country>United States of America</country>
        </postal>

            <phone></phone>
        <phone/>
        <email>mankamis@cisco.com</email>
      </address>
    </author>
    <author initials="K" surname="Patel" fullname="Keyur PAtel"> Patel">
      <organization>Arrcus</organization>
      <address>
        <postal>
                <street></street>

                <region></region>

                <country>UNITED STATES</country>
          <country>United States of America</country>
        </postal>

            <phone></phone>
        <phone/>
        <email>keyur@arrcus.com</email>
      </address>
    </author>
    <author initials="J" surname="Drake" fullname="John Drake">
      <organization>Juniper Networks</organization>
      <address>
            <postal>
                <street></street>

                <region></region>

                <country></country>
            </postal>

            <phone></phone>
        <email>jdrake@juniper.net</email>
      </address>
    </author>
    <author initials="W" surname="Lin" fullname="Wen Lin">
      <organization>Juniper Networks</organization>
      <address>
            <postal>
                <street></street>

                <region></region>

                <country></country>
            </postal>

            <phone></phone>
        <email>wlin@juniper.net</email>
      </address>
    </author>
    <date year="2022"/>
    <area>Routing</area>
    <workgroup>BESS WorkGroup</workgroup> year="2022" month="May"/>
    <area>RTG</area>
    <workgroup>BESS</workgroup>
    <abstract>

        <t>
	        This
      <t>This document describes how to support efficiently endpoints running
	        IGMP(Internet
      the Internet Group Management Protocol) Protocol (IGMP) or MLD (Multicast Multicast Listener Discovery) Discovery (MLD) efficiently
      for the multicast services over an EVPN Ethernet VPN (EVPN) network by incorporating
      IGMP/MLD proxy Proxy procedures on EVPN (Ethernet VPN) PEs. Provider Edges (PEs).
      </t>
    </abstract>
  </front>

  <!-- ***** MIDDLE MATTER ***** -->

  <middle>
    <section title="Introduction">

          <t>
	             In DC numbered="true" toc="default">
      <name>Introduction</name>
      <t>In data center (DC) applications, a point of delivery (POD) can consist of a
      collection of servers supported by several top of rack top-of-rack (ToR) and
      spine switches. This collection of servers and switches are self
	             contained self-contained
      and may have their own control protocol for intra-POD
      communication and orchestration. However, EVPN is used as a standard
      way of inter-POD communication for both intra-DC and inter-DC. A
      subnet can span across multiple PODs and DCs. EVPN provides a robust
      multi-tenant solution with extensive multi-homing multihoming capabilities to
      stretch a subnet (VLAN) across multiple PODs and DCs. There can be
      many hosts (several hundreds) attached to a subnet that is
      stretched across several PODs and DCs.
      </t>

	      <t>
		         These
      <t>These hosts express their interests in multicast groups on a
      given subnet/VLAN by sending IGMP/MLD Membership Reports for
      their interested multicast group(s). Furthermore, an IGMP/MLD router
      periodically sends membership queries Membership Queries to find out if there are hosts
      on that subnet that are still interested in receiving multicast
      traffic for that group. The IGMP/MLD Proxy solution described in this
      document accomplishes three objectives:

		         <list style="numbers">
			         <t>
				         Reduce
      </t>
      <ol spacing="normal" type="1">
	<li>Reduce flooding of IGMP/MLD messages: just Just like the ARP/ND ARP / Neighbor Discovery (ND)
	suppression
	mechanism in EVPN to reduce the flooding of ARP messages over EVPN,
	it is also desired to have a mechanism to reduce the flooding of IGMP/MLD
	messages (both Queries and Membership Reports) in EVPN.
				     </t>

				     <t>
					      Distributed EVPN.</li>
        <li>Distributed anycast multicast proxy: it It is desirable for the EVPN
	network to act as a distributed anycast multicast router with respect
	to IGMP/MLD proxy Proxy function for all the hosts attached to that
					      subnet.
					 </t>

					 <t>
						 Selective Multicast: to forward
	subnet.</li>
        <li>Selective multicast: This describes forwarding multicast traffic over the EVPN
	network such that it only gets forwarded to the PEs that have
						 interest
	interests in the multicast group(s). This document shows how this objective may be achieved
	when Ingress Replication ingress replication is used to distribute the multicast traffic
	among the PEs.  Procedures for supporting selective multicast using
						 P2MP
	Point-to-Multipoint (P2MP) tunnels can be found in <xref target="I-D.ietf-bess-evpn-bum-procedure-updates"/>
				     </t>
			     </list>
		  </t>

		  <t>
			  The target="I-D.ietf-bess-evpn-bum-procedure-updates"
	format="default"/>.</li>
      </ol>
      <t>The first two objectives are achieved by using the IGMP/MLD proxy Proxy on the
      PE. The third objective is achieved by setting up a multicast
      tunnel only among only the PEs that have
      interest in that the multicast group(s) based on the trigger from
      IGMP/MLD proxy Proxy processes. The proposed solutions for each of these
      objectives are discussed in the following sections.
      </t>
    </section>
    <section title="Specification numbered="true" toc="default">
      <name>Specification of Requirements">
	      <t>
		        The Requirements</name>
      <t>The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
		        "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", "<bcp14>MUST</bcp14>", "<bcp14>MUST NOT</bcp14>",
      "<bcp14>REQUIRED</bcp14>", "<bcp14>SHALL</bcp14>", "<bcp14>SHALL NOT</bcp14>",
      "<bcp14>SHOULD</bcp14>", "<bcp14>SHOULD NOT</bcp14>", "<bcp14>RECOMMENDED</bcp14>",
      "<bcp14>NOT RECOMMENDED</bcp14>", "<bcp14>MAY</bcp14>", and
		        "OPTIONAL"
      "<bcp14>OPTIONAL</bcp14>" in this document are to be interpreted as described in
      BCP 14 <xref target="RFC2119"/> target="RFC2119" format="default"/> <xref target="RFC8174"/> target="RFC8174"
      format="default"/> when, and only when,  they appear in all capitals, as shown here.
      </t>
    </section>
    <section title="Terminology">
	      <t>
		      <list style="symbols">
			<t> AC: numbered="true" toc="default">
      <name>Terminology</name>
      <dl newline="false" spacing="normal">
        <dt> AC:</dt>
	<dd> Attachment Circuit.
			</t>
			 <t>
			   All-Active Circuit</dd>
        <dt>All-Active Redundancy Mode: Mode:</dt>
	<dd> When all PEs attached to an Ethernet
	segment are allowed to forward known unicast traffic to/from that
	Ethernet segment for a given VLAN, then the Ethernet segment is
	defined to be operating in All-Active redundancy mode.
			</t>
			 <t>
			   BD: mode.</dd>
        <dt>BD:</dt>
	<dd> Broadcast Domain. As per <xref target="RFC7432"/>, target="RFC7432" format="default"/>, an EVI EVPN instance
	(EVI) consists of a single BD
	or multiple BDs. In case of VLAN-bundle a VLAN bundle and a VLAN-aware bundle service
	model, an EVI contains multiple BDs. Also, in this document, BD and
	subnet are equivalent terms.
			</t>
						<t>
				DC: terms.</dd>
        <dt>DC:</dt>
	<dd> Data Center
			</t>

			<t> Center</dd>
        <dt>ES:</dt>
	<dd> Ethernet Segment (ES): When segment. This is when a customer site (device or network) is
	connected to one or more PEs via a set of Ethernet links.
			</t>

			<t> links.</dd>
        <dt>ESI:</dt>
	<dd> Ethernet Segment Identifier (ESI): A Identifier. This is a unique non-zero identifier that
	identifies an Ethernet Segment.
			</t>

			<t>
			   Ethernet Tag: segment.</dd>
        <dt>Ethernet Tag:</dt>
	<dd> It identifies a particular broadcast
	domain, e.g., a VLAN.  An EVPN instance consists of one or more
	broadcast domains.
			</t>

			<t>
			   EVI: An domains.</dd>
        <dt>EVI:</dt>
	<dd> EVPN instance spanning Instance. This spans the Provider Edge (PE) devices
	participating in that EVPN
			</t>

			<t>
			   EVPN: EVPN.</dd>
        <dt>EVPN:</dt>
	<dd> Ethernet Virtual Private Network
			</t>

			<t>
			   IGMP: Network</dd>
        <dt>IGMP:</dt>
	<dd> Internet Group Management Protocol
			</t>
			<t>
			   IR: Protocol</dd>
        <dt>IR:</dt>
	<dd> Ingress Replication
			</t>

			<t>
			   MLD: Replication</dd>
        <dt>MLD:</dt>
	<dd> Multicast Listener Discovery
			</t>

			<t> OIF: Discovery</dd>
        <dt> OIF:</dt>
	<dd> Outgoing Interface for multicast. It can be a physical interface,
	virtual interface interface, or tunnel.</t>
			<t>
			   PE: tunnel.</dd>
        <dt>PE:</dt>
	<dd> Provider Edge.
			</t>

	         <t>
			   POD: Edge</dd>
        <dt>POD:</dt><dd> Point of Delivery
</t>

			<t> S-PMSI: Delivery</dd>
        <dt> S-PMSI:</dt>
	<dd> Selective P-Multicast Service Interface - Interface. This is a conceptual interface for a
	PE to send customer multicast traffic to some of the PEs in the same VPN.
			</t>
			<t>
			   Single-Active VPN.</dd>
        <dt>Single-Active Redundancy Mode: Mode:</dt>
	<dd> When only a single PE, among all the
	PEs attached to an Ethernet segment, is allowed to forward traffic
	to/from that Ethernet segment for a given VLAN, then the Ethernet
	segment is defined to be operating in Single-Active redundancy mode.
			</t>

						<t> SMET: mode.</dd>
        <dt> SMET:</dt>
	<dd> Selective Multicast Ethernet Tag
				</t>
			<t>
			   ToR: Tag</dd>
        <dt>ToR:</dt>
	<dd> Top of Rack
			</t>

			</list>
			</t>
			<t>
			   This Rack</dd>
      </dl>
      <t>This document also assumes familiarity with the terminology of
      <xref target="RFC7432"/>, target="RFC7432" format="default"/>, <xref target="RFC3376"/>, target="RFC3376"
      format="default"/>, and <xref target="RFC2236"/> . Though most of the place target="RFC2236" format="default"/>.
      When this document uses the term IGMP "IGMP
      Membership Report, Report", the text applies equally for applies to the MLD
      Membership Report too. Report. Similarly, text for IGMPv2 applies to MLDv1 MLDv1,
      and text for IGMPv3 applies to MLDv2. IGMP / MLD IGMP/MLD version encoding in the
      BGP update is stated in <xref target="bgp-encoding"/>
			</t> target="bgp-encoding" format="default"/>.</t>
      <t> It is important to note that when there is text considering whether a PE
      indicates support for IGMP proxying, the corresponding behavior has a
      natural analogue analog for indication of indicating support for MLD proxying, and the analogous
      requirements apply as well.
      </t>
    </section>
    <section title="IGMP/MLD Proxy">
	      <t>
		         The numbered="true" toc="default">
      <name>IGMP/MLD Proxy</name>
      <t>The IGMP Proxy mechanism is used to reduce the flooding of IGMP
      messages over an EVPN network network, similar to the ARP proxy used in reducing
      the flooding of ARP messages over EVPN. It also provides a triggering
      mechanism for the PEs to setup set up their underlay multicast tunnels. The
      IGMP Proxy mechanism consists of two components:
		         <list style="numbers">
		         <t>
      </t>
      <ol spacing="normal" type="1">
	<li> Proxy for IGMP Membership Reports. </t>
		         <t> Reports </li>
        <li> Proxy for IGMP Membership Queries. </t>
		         </list>
		  </t>
		   <t>
				  The Queries </li>
      </ol>
      <t>The goal of IGMP and MLD proxying is to make the EVPN behave seamlessly for
      the tenant systems with respect to multicast operations, operations while using a more
      efficient delivery system for signaling and delivery across the VPN.
      Accordingly, group state must be tracked synchronously among the PEs
      serving the VPN, with join and leave events propagated to the peer PEs, PEs and
      each PE tracking the state of each of its peer PEs with respect to whether
      there are locally attached group members (and in some cases, senders), what
      version(s) of IGMP/MLD are in use for those locally attached group members,
      etc.  In order to perform this translation, each PE acts as an IGMP router
      for the locally attached domain, and maintains the requisite state on
      locally attached nodes, sends periodic membership queries, Membership Queries, etc.  The role
      of EVPN SMET Selective Multicast Ethernet Tag (SMET) route propagation is to
      ensure that each PE's local state is
      propagated to the other PEs so that they share a consistent view of the
      overall IGMP Membership Request and Leave Group state.  It is important to
      note that the need to keep such local state can be triggered by either
      local IGMP traffic or BGP EVPN signaling.  In most cases cases, a local IGMP event
      will need to be signaled over EVPN, though state initiated by received EVPN
      traffic will not always need to be relayed to the locally attached domain.
      </t>
      <section title="Proxy Reporting">
			  <t>
				  When numbered="true" toc="default">
        <name>Proxy Reporting</name>
        <t>When IGMP protocol is used between hosts and their first hop EVPN
	router (EVPN PE), Proxy-reporting proxy reporting is used by the EVPN PE to summarize
	(when possible) reports received from downstream hosts and propagate
	them in BGP to other PEs that are interested in the information.
	This
	is done by terminating the IGMP Membership Reports in the first hop PE, PE and
	translating and exchanging the relevant information among EVPN BGP
	speakers. The information is again translated back to an IGMP message at
	the recipient EVPN speaker. Thus Thus, it helps create an IGMP overlay
	subnet using BGP. In order to facilitate such an overlay, this
	document also defines a new EVPN route type NLRI, Network Layer Reachability Information
	(NLRI) and the EVPN Selective
				  Multicast Ethernet Tag SMET route, along with its procedures to help
	exchange and register IGMP multicast groups groups; see <xref target="bgp-encoding"/>. target="bgp-encoding"
	format="default"/>.
        </t>
        <section title="IGMP/MLD numbered="true" toc="default">
          <name>IGMP/MLD Membership Report Advertisement in BGP">
				  <t>
					    When BGP</name>
          <t>When a PE wants to advertise an IGMP Membership Report using
	  the BGP EVPN route, it follows the following proceeding rules (BGP encoding
	  is stated in <xref target="bgp-encoding"/>). Where target="bgp-encoding" format="default"/>). The first four
	  rules are applicable to the originator PE PE, and the last three rules are applicable
	  to remote PE processing SMET routes:
          </t>
                   <t>
	                   Processing
          <t>Processing at the BGP route originator:
					    <list style="numbers">
						    <t>
							 When
          </t>
          <ol spacing="normal" type="1">
	    <li>When the first hop PE receives IGMP Membership Reports
							   ,
	    belonging to the same IGMP version, version from different attached
	    hosts for the same (*,G) or (S,G), it SHOULD <bcp14>SHOULD</bcp14> send a single
	    BGP message corresponding to the very first IGMP Membership Request (BGP update as
	    soon as possible) for that (*,G) or (S,G). This is because BGP is a
	    stateful protocol protocol, and no further transmission of the same report is
	    needed. If the IGMP Membership Request is for (*,G), then multicast group address
							   MUST the Multicast Group Address
	    <bcp14>MUST</bcp14> be sent along with the corresponding version flag (v2 or v3)
	    set. In case of IGMPv3, the exclude flag MUST <bcp14>MUST</bcp14> also be set to
	    indicate that no source IP address must be excluded (include all
	    sources "*").
	    If the IGMP Membership Report is for (S,G), then besides setting multicast group
							   address the Multicast Group
	    Address along with the version flag v3, v3 flag, the source IP address and the
							   IE
	    Include/Exclude (IE) flag MUST <bcp14>MUST</bcp14> be set. It should be noted that that, when
	    advertising the EVPN route for (S,G), the only valid version flag is
	    v3 (v2 flags MUST <bcp14>MUST</bcp14> be set to zero).
							</t>
							<t>

							   When 0).
	    </li>
            <li>When the first hop PE receives an IGMPv3 Membership Report for (S,G) on a given
	    BD, it MUST <bcp14>MUST</bcp14> advertise the corresponding EVPN Selective Multicast
							   Ethernet Tag (SMET) route SMET route, regardless
	    of whether the source (S) is
	    attached to itself or not not, in order to facilitate the source move in
	    the future.
							</t>
							<t>

							   When	</li>
            <li>When the first hop PE receives an IGMP version-X Membership Report first for
	    (*,G) and then later it receives an IGMP version-Y Membership Report for the same
	    (*,G), then it MUST <bcp14>MUST</bcp14> re-advertise the same EVPN SMET route with the flag
	    for version-Y set in addition to any previously-set previously set version flag(s).
	    In other words, the first hop PE MUST NOT <bcp14>MUST NOT</bcp14> withdraw the EVPN route
	    before sending the new route because the flag Flags field is not part of
	    BGP route key processing.

							</t>
							<t>
							   When
	    </li>
            <li>When the first hop PE receives an IGMP version-X Membership Report first for
	    (*,G) and then later it receives an IGMPv3 Membership Report for the same
							   multicast group address
	    Multicast Group Address but for a specific source address S, then the
	    PE MUST <bcp14>MUST</bcp14> advertise a new EVPN SMET route with the v3 flag set (and v2 reset).
	    The IE flag also need needs to be set accordingly.
	    Since the source IP address is used as part of BGP route key processing processing,
	    it is considered as to be a new BGP route advertisement. When different version versions
	    of IGMP Membership Report are received, the final state MUST <bcp14>MUST</bcp14> be as per section 5.1 of
	    <xref target="RFC3376"/>. target="RFC3376" sectionFormat="of" section="5.1"/>.
	    At the end of the route processing processing, local and remote group record state MUST
	    <bcp14>MUST</bcp14>
	    be as per section 5.1 of <xref target="RFC3376"/>.
							</t>
							</list>

							Processing target="RFC3376" sectionFormat="of" section="5.1"/>.
	    </li>
          </ol>
          <t>Processing at the BGP route receiver:

							<list style="numbers">
							<t>

							   When
          </t>
          <ol spacing="normal" type="1">
	    <li>When a PE receives an EVPN SMET route with more than one version
	    flag set, it will generate the corresponding IGMP report Report for (*,G)
	    for each version specified in the flags Flags field. With multiple version
	    flags set, there must not be a source IP address in the received EVPN
	    route. If there is, then an error SHOULD <bcp14>SHOULD</bcp14> be logged. If the v3 flag
	    is set (in addition to v2), then the IE flag MUST <bcp14>MUST</bcp14>
	    indicate "exclude". If not, then an error SHOULD <bcp14>SHOULD</bcp14> be logged. The PE
							   MUST
	    <bcp14>MUST</bcp14> generate an IGMP Membership Report for that (*,G) and
	    each IGMP version in the version flag.
							</t>
							<t>

							   When
	    </li>
            <li>When a PE receives a list of EVPN SMET NLRIs in its BGP update
	    message, each with a different source IP address and the same
							   multicast group address,
	    Multicast Group Address, and the version flag is set to v3, then the
	    PE generates an IGMPv3 Membership Report with a record corresponding
	    to the list of source IP addresses and the group address address, along with
	    the proper indication of inclusion/exclusion.
							</t>
							<t>
								Upon
	    </li>
            <li>Upon receiving an EVPN SMET route(s) and before generating the
	    corresponding IGMP Membership Request(s), the PE checks to see whether it has any
							   CE a
	    Customer Edge (CE) multicast router for that BD on any of its ES's ESs . The PE provides
	    such a check by listening for PIM Hello messages on that AC (i.e,
							   ES,BD). AC, i.e.,
	    (ES,BD). If the PE does have the router's ACs, then the generated
	    IGMP Membership Request(s) are is sent to those ACs. If it doesn't have any of the
	    router's AC, ACs, then no IGMP Membership Request(s) needs to be generated. This is
	    because sending IGMP Membership Requests to other hosts can result in
	    unintentionally preventing a host from joining a specific multicast
	    group using IGMPv2 - IGMPv2, i.e., if the PE does not receive a Membership Report from the
							   host
	    host, it will not forward multicast data to it. Per <xref target="RFC4541"/> target="RFC4541"
	    format="default"/> , when an
	    IGMPv2 host receives a Membership Report for a group address that it
	    intends to join, the host will suppress its own membership report Membership Report for
	    the same group, and if the PE does not receive an IGMP Membership Report from the host host,
	    it will not forward multicast data to it. In other words, an IGMPv2
	    Membership Report MUST NOT <bcp14>MUST NOT</bcp14> be sent on an AC that does not lead to a CE
	    multicast router. This message suppression is a requirement for IGMPv2 hosts.
	    This is not a problem for hosts running IGMPv3 IGMPv3, because there is no
	    suppression of IGMP Membership Reports.

							</t>
						</list>

				  </t>
	    </li>
          </ol>
        </section>
        <section title="IGMP/MLD numbered="true" toc="default">
          <name>IGMP/MLD Leave Group Advertisement in BGP">
				  <t>
					     When BGP</name>
          <t>When a PE wants to withdraw an EVPN SMET route corresponding to an
	  IGMPv2 Leave Group or IGMPv3 "Leave" equivalent message, it
	  follows the following rules, where rules below. The first rule defines the procedure at the
	  originator PE PE, and the last two rules talk about procedures at the remote PE:
          </t>
					     <t>
						     Processing
          <t>Processing at the BGP route originator:

					     <list style="numbers">
						     <t>
							   When
          </t>
          <ol spacing="normal" type="1">
	    <li>When a PE receives an IGMPv2 Leave Group or its "Leave" equivalent
	    message for IGMPv3 from its attached host, it checks to see if this
	    host is the last host that is interested in this multicast group by
	    sending a query for the multicast group.
	    If the host was indeed the
	    last one (i.e. (i.e., no responses are received for the query), then the PE
							   MUST re-advertises
	    <bcp14>MUST</bcp14> re-advertise the EVPN SMET Multicast route with the corresponding
	    version flag reset. If this is the last version flag to be reset,
	    then instead of re-advertising the EVPN route with all version flags
	    reset, the PE MUST <bcp14>MUST</bcp14> withdraw the EVPN route for that (*,G).
							</t>
							</list>
							Processing
	    </li>
          </ol>
          <t>Processing at the BGP route receiver:
							<list style="numbers">
							<t>
							   When
          </t>
          <ol spacing="normal" type="1">
	    <li>When a PE receives an EVPN SMET route for a given (*,G), it
	    compares the received version flags from the route with its per-PE
	    stored version flags.
	    If the PE finds that a version flag associated
	    with the (*,G) for the remote PE is reset, then the PE MUST <bcp14>MUST</bcp14> generate
	    IGMP Leave for that (*,G) toward its local interface (if any) any), which is
	    attached to the multicast router for that multicast group. It should
	    be noted that the received EVPN route MUST <bcp14>MUST</bcp14> have at least have one
	    version flag set. If all version flags are reset, it is an error
	    because the PE should have received an EVPN route withdraw for the
	    last version flag. Error MUST An error <bcp14>MUST</bcp14> be considered as a BGP error error, and
	    the PE MUST <bcp14>MUST</bcp14> apply the
	    "treat-as-withdraw" procedure of per <xref target="RFC7606"/>.
							</t>
							<t>
							   When target="RFC7606" format="default"/>.
	    </li>
            <li>When a PE receives an EVPN SMET route withdraw, it removes the
	    remote PE from its OIF list for that multicast group group, and if there are
	    no more OIF entries for that multicast group (either locally or
	    remotely), then the PE MUST <bcp14>MUST</bcp14> stop responding to Membership
	    Queries from the
	    locally attached router (if any). If there is a source for that
	    multicast group, the PE stops sending multicast traffic for that source.
							</t>
						 </list>
				  </t>
	    </li>
          </ol>
        </section>
      </section>
      <section title="Proxy Querier">
			  <t>
				  As numbered="true" toc="default">
        <name>Proxy Querier</name>
        <t>As mentioned in the previous sections, each PE MUST <bcp14>MUST</bcp14> have proxy
	querier functionality for the following reasons:

				  <list style="numbers">
					  <t>
						  To
        </t>
        <ol spacing="normal" type="1">
	  <li>to enable the collection of EVPN PEs providing L2VPN Layer 2 Virtual Private Network
	  (L2VPN) service to
	  act as a distributed multicast router with Anycast an anycast IP address for all
	  attached hosts in that subnet.
					  </t>

					  <t>
						  To subnet</li>
          <li>to enable suppression of IGMP Membership Reports and Membership Queries over
	  MPLS/IP core.
					  </t>
				  </list>
			  </t> core</li>
        </ol>
      </section>
    </section>
    <section title="Operation">
	      <t>
		      Consider numbered="true" toc="default">
      <name>Operation</name>
      <t>Consider the EVPN network of Figure-1, in <xref target="EVPN"/>, where there is an EVPN
      instance configured across the PEs shown in this figure (namely PE1,
      PE2, and PE3). Let's consider that this EVPN instance consists of a
      single bridge domain (single subnet) with all the hosts, sources, hosts and sources and
      the multicast router connected to this subnet. PE1 only has hosts(host hosts (host denoted by Hx)
      connected to it. PE2 has a mix of hosts and a multicast source. PE3
      has a mix of hosts, a multicast source (source denoted by Sx), and a multicast router
      (router denoted by Rx).
      Furthermore, let's consider that for (S1,G1), R1 is used as the
      multicast router. The following subsections describe the IGMP proxy Proxy
      operation in different PEs with regard to whether the locally
      attached devices for that subnet are:

			   <list style="symbols">
				   <t>
					   only hosts
      </t>
				    <t>
      <ul spacing="normal">
        <li>only hosts,</li>
        <li>a mix of hosts and a multicast source
				   </t>
				   <t> source, or</li>
        <li>a mix of hosts, a multicast source, and a multicast router
				   </t>
			   </list>
		  </t> router.</li>
      </ul>
      <figure  > anchor="EVPN">
	<name>EVPN Network</name>
      <artwork ><![CDATA[ name=">EVPN network" type="" align="center" alt=""><![CDATA[
	              +--------------+
                      |              |
                      |              |
               +----+ |              | +----+
H1:(*,G1)v2 ---|    | |              | |    |---- H6(*,G1)v2
H2:(*,G1)v2 ---| PE1| |   IP/MPLS    | | PE2|---- H7(S2,G2)v3
H3:(*,G1)v3 ---|    | |   Network    | |    |---- S2
H4:(S2,G2)v3 --|    | |              | |    |
               +----+ |              | +----+
                      |              |
               +----+ |              |
H5:(S1,G1)v3 --|    | |              |
         S1 ---| PE3| |              |
         R1 ---|    | |              |
               +----+ |              |
                      |              |
                      +--------------+

   Figure 1: EVPN network
]]></artwork>
</figure>
      <section title="PE with only attached hosts numbered="true" toc="default">
        <name>PE with Only Attached Hosts for a given subnet">
		<t>
			When Given Subnet</name>
        <t>When PE1 receives an IGMPv2 Membership Report from H1, it does not forward
	this Membership Report to any of its other ports (for this subnet) because all
	these local ports are associated with the hosts.
        PE1 sends an
	EVPN Multicast Group SMET route corresponding to this Membership Report for (*,G1) and
			setting
	sets the v2 flag. This EVPN route is received by PE2 and PE3 that PE3, which are
	the members of the same BD (i.e., same EVI in case of a VLAN-based
	service or EVI,VLAN EVI and VLAN in case of a VLAN-aware bundle service). PE3
	reconstructs the IGMPv2 Membership Report from this EVPN BGP route and only
	sends it to the port(s) with multicast routers attached to it (for
	that subnet). In this example, PE3 sends the reconstructed IGMPv2
	Membership Report for (*,G1)  only to R1. Furthermore, even though PE2
	receives the EVPN BGP route, it does not send it to any of its ports
	for that subnet; viz, subnet (viz., ports associated with H6 and H7. H7).
        </t>

		<t>
			When
        <t>When PE1 receives the second IGMPv2 Membership Report from H2 for the same
	multicast group (*,G1), it only adds that port to its OIF list list, but it
	doesn't send any EVPN BGP route routes because there is no change in
	information. However, when it receives the IGMPv3 Membership Report from H3 for
	the same (*,G1). Besides (*,G1), besides adding the corresponding port to its OIF
	list, it re-advertises the previously sent EVPN SMET route with the
	v3 and exclude flag set.
        </t>

		<t>
			Finally
        <t>Finally, when PE1 receives the IGMPv3 Membership Report from H4 for (S2,G2), it
	advertises a new EVPN SMET route corresponding to it.
        </t>
      </section>
      <section title="PE numbered="true" toc="default">
        <name>PE with a mix Mix of attached hosts Attached Hosts and multicast source">
		<t>
			   The a Multicast Source</name>
        <t>The main difference in this case is that when PE2 receives the IGMPv3
	Membership Report from H7 for (S2,G2), it does advertise advertises it in BGP to support the
	source move moving, even though PE2 knows that S2 is attached to its local
	AC. PE2 adds the port associated with H7 to its OIF list for (S2,G2).
	The processing for IGMPv2 received from H6 is the same as the IGMPv2
	Membership Report described in the previous section.
        </t>
      </section>
      <section title="PE numbered="true" toc="default">
        <name>PE with a mix Mix of attached hosts, Attached Hosts, a multicast source Multicast Source, and a router">
		<t>
			   The Router</name>
        <t>The main difference in this case relative to the previous two
	sections is that IGMP v2/v3 IGMPv2/v3 Membership Report messages received locally need to
	be sent to the port associated with router R1. Furthermore, the Membership Reports
	received via BGP (SMET) need to be passed to the R1 port but filtered
	for all other ports.
        </t>
      </section>
    </section>
    <section title="All-Active Multi-Homing">
	   <t>
		   Because numbered="true" toc="default">
      <name>All-Active Multihoming</name>
      <t>Because the LAG Link Aggregation Group (LAG) flow hashing algorithm used by the CE is unknown at
      the PE, in an All-Active redundancy mode mode, it must be assumed that the
      CE can send a given IGMP message to any one of the multi-homed multihomed PEs,
      either DF Designated Forwarder (DF) or non-DF; non-DF, i.e., different IGMP Membership
      Request messages can arrive at
      different PEs in the redundancy group and furthermore group. Furthermore, their
      corresponding Leave messages can arrive at PEs that are different
      from the ones that received the Membership Report. Therefore, all PEs
      attached to a given ES Ethernet segment (ES) must coordinate the IGMP Membership Request and Leave Group
      (x,G) state, where x may be either '*' "*" or a particular source S, S for
      each BD on that ES. Each PE has a local copy of that state state, and the EVPN signaling
      serves to synchronize that state across PEs. This allows the DF for that (ES,BD) to correctly
      advertise or withdraw a Selective Multicast Ethernet Tag (SMET) SMET route
      for that (x,G) group in that BD when needed.
      All-Active multihoming PEs for a given ES MUST <bcp14>MUST</bcp14> support IGMP
      synchronization procedures described in this section if they need to
      perform IGMP proxy Proxy for hosts connected to that ES.
      </t>
      <section title="Local numbered="true" toc="default" anchor="local-igmp-mld">
        <name>Local IGMP/MLD Membership Report Synchronization">
		   <t>
			      When Synchronization</name>
        <t>When a PE, either DF or non-DF, receives an IGMP Membership Report
	for (x,G) on a given multihomed ES operating in All-Active redundancy mode, an IGMP Membership Report
			      for (x,G), it determines the BD to which the IGMP Membership Report
	belongs. If the PE doesn't already have the local IGMP Membership Request (x,G) state
	for that BD on that ES, it MUST <bcp14>MUST</bcp14> instantiate that local IGMP Membership
	Request (x,G)
	state and MUST <bcp14>MUST</bcp14> advertise a BGP IGMP Membership Report Synch route
	for that (ES,BD).
			       Local
	The local IGMP Membership Request (x,G) state refers to the IGMP Membership Request (x,G) state
	that is created as a result of processing an IGMP Membership Report
	for (x,G).
        </t>

		   <t>
			   The
        <t>The IGMP Membership Report Synch route MUST <bcp14>MUST</bcp14> carry the ES-Import RT
	Route Target (RT) for the ES on
	which the IGMP Membership Report was received.  Thus  Thus, it MUST <bcp14>MUST</bcp14> only be
	imported by the PEs attached to that ES and not any other PEs.
        </t>

		   <t>
			      When
        <t>When a PE, either DF or non-DF, receives an IGMP Membership Report Synch route route, it
	installs that route route, and if it doesn't already have the IGMP Membership Request (x,G)
	state for that (ES,BD), it MUST <bcp14>MUST</bcp14> instantiate that IGMP Membership
	Request (x,G)
			      state -
	state, i.e., the IGMP Membership Request (x,G) state is the union of the local IGMP
	Membership Report (x,G) state and the installed IGMP Membership Report Synch route.
	If the DF did not already advertise (originate) a SMET route for that (x,G)
	group in that BD, it MUST <bcp14>MUST</bcp14> do so now.
        </t>

		   <t>
			    When
        <t>When a PE, either DF or non-DF, deletes its local IGMP Membership Request (x,G)
	state for that (ES,BD), it MUST <bcp14>MUST</bcp14> withdraw its BGP IGMP Membership
	Report Synch route for that (ES,BD).
        </t>

		   <t>
			      When
        <t>When a PE, either DF or non-DF, receives the withdrawal of an IGMP
	Membership Report Synch route from another PE PE, it MUST <bcp14>MUST</bcp14> remove that route.
	When a PE has no local IGMP Membership Request (x,G) state and it has no installed IGMP
	Membership Report Synch routes, it MUST <bcp14>MUST</bcp14> remove that IGMP Membership Request
	(x,G) state for that (ES,BD).
	If the DF no longer has the IGMP Membership Request (x,G) state for that BD on
	any ES for which it is the DF, it MUST <bcp14>MUST</bcp14> withdraw its SMET route for that
	(x,G) group in that BD.
        </t>
		   <t>
			      In
        <t>In other words, a PE advertises an a SMET route for that (x,G) group in
	that BD when it has the IGMP Membership Request (x,G) state in that BD on at least one
	ES for which it is DF the DF, and it withdraws that SMET route when it does
	not have an IGMP Membership Request (x,G) state in that BD on any ES for which it is
	the DF.
        </t>
      </section>
      <section title="Local numbered="true" toc="default">
        <name>Local IGMP/MLD Leave Group Synchronization">
		   <t>
			     When Synchronization</name>
        <t>When a PE, either DF or non-DF, receives, on a given multihomed ES
			     operating in All-Active redundancy mode, receives an IGMP Leave Group message
	for (x,G) from the attached CE, CE on a given multihomed ES
	operating in All-Active redundancy mode, it determines the BD to which the
	IGMPv2 Leave Group belongs.  Regardless of whether it has the IGMP Membership Request
	(x,G) state for that (ES,BD), it initiates the (x,G) leave group
	synchronization procedure, which consists of the following steps:

			     <list style="numbers">
				     <t>
					     It
        </t>
        <ol spacing="normal" type="1">
	  <li>It computes the Maximum Response Time, which is the duration of the
	  (x,G) leave group synchronization procedure.  This is the product of
	  two locally configured values, Last Member Query Count and Last
	  Member Query Interval (described in Section 3 of <xref target="RFC2236"/>), target="RFC2236" section="3"
	  sectionFormat="of"/>), plus a
	  delta corresponding to the time it takes for a BGP advertisement to
	  propagate between the PEs attached to the multihomed ES (delta is a
	  consistently configured value on all PEs attached to the multihomed
	  ES).
					 </t>

					 <t>
						 It
	  </li>
          <li>It starts the Maximum Response Time timer. Note that the receipt
	  of subsequent IGMP Leave Group messages or BGP Leave Synch routes for
	  (x,G) do not change the value of a currently running Maximum Response
	  Time timer and are ignored by the PE.
					 </t>

					 <t>
						 It
	  </li>
          <li>It initiates the Last Member Query procedure described in Section
						 3 of
	  <xref target="RFC2236"/>; viz, target="RFC2236" section="3" sectionFormat="of"/>; viz., it
	  sends a number of Group-Specific Query (x,G)
	  messages (Last Member Query Count) at a fixed interval (Last Member
	  Query Interval) to the attached CE.
					 </t>

					 <t>
						 It CE.</li>
          <li>It advertises an IGMP Leave Synch route for that that (ES,BD).
	  This route notifies the other multihomed PEs attached to the given
	  multihomed ES that it has initiated an (x,G) leave group
	  synchronization procedure; procedure, i.e., it carries the ES-Import RT for the
	  ES on which the IGMP Leave Group was received.  It also contains the
	  Maximum Response Time.
					 </t>
					 <t>
						 When
	  </li>
          <li>When the Maximum Response Timer Time timer expires, the PE that has
	  advertised the IGMP Leave Synch route withdraws it.
					 </t>
				 </list>
		   </t>
	  </li>
        </ol>
        <section title="Remote numbered="true" toc="default">
          <name>Remote Leave Group Synchronization">
			   <t>
				   When Synchronization</name>
          <t>When a PE, either DF or non-DF, receives an IGMP Leave Synch route route, it
	  installs that route and it starts a timer for (x,G) on the specified
				   (ES,BD)
	  (ES,BD), whose value is set to the Maximum Response Time in the
	  received IGMP Leave Synch route.  Note that the receipt of subsequent
	  IGMPv2 Leave Group messages or BGP Leave Synch routes for (x,G) do
	  not change the value of a currently running Maximum Response Time
	  timer and are ignored by the PE.
          </t>
        </section>
        <section title="Common numbered="true" toc="default">
          <name>Common Leave Group Synchronization">
			  <t>
				  If Synchronization</name>
          <t>If a PE attached to the multihomed ES receives an IGMP Membership
	  Report for (x,G) before the Maximum Response Time timer expires, it
	  advertises a BGP IGMP Membership Report Synch route for that (ES,BD). If it
	  doesn't already have the local IGMP Membership Request (x,G) state for that (ES,BD),
	  it instantiates that local IGMP Membership Request (x,G) state. If the DF is not
	  currently advertising (originating) a SMET route for that (x,G) group
	  in that BD, it does so now.
          </t>

			  <t>
				     If
          <t>If a PE attached to the multihomed ES receives an IGMP Membership Report Synch
	  route for (x,G) before the Maximum Response Time timer expires, it
	  installs that route route, and if it doesn't already have the IGMP Membership Request (x,G)
	  state for that BD on that ES, it instantiates that IGMP Membership Request (x,G)
	  state. If the DF has not already advertised (originated) a SMET route
	  for that (x,G) group in that BD, it does so now.
          </t>

			  <t>
				     When
          <t>When the Maximum Response Timer expires Time timer expires, a PE that has advertised an
	  IGMP Leave Synch route, route withdraws it.  Any PE attached to the
	  multihomed ES, that which started the Maximum Response Time and has no
	  local IGMP Membership Request (x,G) state and no installed IGMP Membership Report
	  Synch routes,
				     it
	  removes the IGMP Membership Request (x,G) state for that (ES,BD).  If the DF no
	  longer has the IGMP Membership Request (x,G) state for that BD on any ES for which it
	  is the DF, it withdraws its SMET route for that (x,G) group in that BD.
          </t>
        </section>
      </section>
      <section title="Mass numbered="true" toc="default">
        <name>Mass Withdraw of the Multicast Membership Report Sync route Synch Route in case Case of failure">
		   <t>
			      A Failure</name>
        <t>A PE which that has received an IGMP Membership Request would have synced the IGMP
	Membership Report by the procedure defined in section 6.1. <xref target="local-igmp-mld"
	format="default"/>. If a PE with the local Membership Report
	state goes down or the PE to CE link goes down, it would lead to a
	mass withdraw of multicast routes. Remote PEs (PEs where these routes
	were remote IGMP Membership Reports) SHOULD NOT <bcp14>SHOULD NOT</bcp14> remove the state immediately;
			      instead
	instead, General Query SHOULD <bcp14>SHOULD</bcp14> be generated to refresh the states.
	There are several ways to detect failure at a
	peer, e.g. e.g., using IGP next hop next-hop tracking or ES route withdraw.
        </t>
      </section>
    </section>
    <section title="Single-Active Multi-Homing">
	   <t>
		      Note numbered="true" toc="default">
      <name>Single-Active Multihoming</name>
      <t>Note that to facilitate state synchronization after failover, the PEs
      attached to a multihomed ES operating in Single-Active redundancy mode
		      SHOULD
      <bcp14>SHOULD</bcp14> also coordinate the IGMP Membership Report (x,G) state.
      In this case case, all IGMP
      Membership Report messages are received by the DF and distributed to the non-DF
      PEs using the procedures described above.
      </t>
    </section>
    <section title="Selective numbered="true" toc="default">
      <name>Selective Multicast Procedures for IR tunnels">
		   <t>
			   If Tunnels</name>
      <t>If an ingress PE uses ingress replication, then for a given (x,G)
      group in a given BD:

			   <list style="numbers">
				   <t>
					   It
      </t>
      <ol spacing="normal" type="1">
	<li>It sends (x,G) traffic to the set of PEs not supporting IGMP or MLD
					   Proxy.
	Proxies. This set consists of any PE that has advertised an IMET Inclusive Multicast
	Ethernet Tag (IMET) route for the BD
	without a  Multicast Flags extended community Extended Community or with a Multicast Flags extended
					   community Extended
	Community in which neither the IGMP Proxy support nor the  MLD Proxy support flags are set.
				   </t>

				   <t>
					   It
	</li>
        <li>It sends (x,G) traffic to the set of PEs supporting IGMP or MLD Proxy Proxies
	and having has listeners for that (x,G) group in that BD. This set consists of any PE
	that has advertised an IMET route for the BD
	with a Multicast Flags extended community Extended Community in which the IGMP Proxy support and/or
	the  MLD Proxy support flags are set and that has advertised a SMET route for that (x,G)
	group in that BD.
				   </t>

			   </list>

		   </t>
	</li>
      </ol>
    </section>
    <section title="BGP Encoding" anchor="bgp-encoding">
	     <t>
		        This anchor="bgp-encoding" numbered="true" toc="default">
      <name>BGP Encoding</name>
      <t>This document defines three new BGP EVPN routes to carry IGMP
      Membership Reports. The route types are known as:
      </t>

		                 <t>      + 6 - Selective

      <dl newline="false" spacing="normal">
        <dt>6 -</dt>
	<dd>Selective Multicast Ethernet Tag Route </t>
		                 <t>      + 7 - Multicast </dd>
	<dt>7 -</dt>
	<dd>Multicast Membership Report Synch Route </t>
		                 <t>      + 8 - Multicast </dd>
	<dt>8 -</dt>
	<dd>Multicast Leave Synch Route </t>

		  <t>

		           The </dd>
      </dl>

      <t>The detailed encoding and procedures for these route types are
      described in subsequent sections.
      </t>
      <section title="Selective anchor="SMET" numbered="true" toc="default">
        <name>Selective Multicast Ethernet Tag Route" anchor="SMET">
			 <t>
				 A Selective Multicast Ethernet Tag route type specific Route</name>
        <t>A SMET route-type-specific EVPN NLRI
	consists of the following:
        </t>

		     		  <figure  >
        <artwork ><![CDATA[ name="" type="" align="center" alt=""><![CDATA[
+---------------------------------------+
|  RD (8 octets)                        |
+---------------------------------------+
|  Ethernet Tag ID (4 octets)           |
+---------------------------------------+
|  Multicast Source Length (1 octet)    |
+---------------------------------------+
|  Multicast Source Address (variable)  |
+---------------------------------------+
|  Multicast Group Length (1 octet)     |
+---------------------------------------+
|  Multicast Group Address (Variable)   |
+---------------------------------------+
|  Originator Router Length (1 octet)   |
+---------------------------------------+
|  Originator Router Address (variable) |
+---------------------------------------+
|  Flags (1 octet)                      |
+---------------------------------------+
]]></artwork>
</figure>

          <t>
	           For
        <t>For the purpose of BGP route key processing, all the fields are
	considered to be part of the prefix in the NLRI NLRI, except for the one-
	           octet flag 1-octet
	Flags field. The Flags fields are defined as follows:
        </t>

		     		  <figure  >
        <artwork ><![CDATA[ name="" type="" align="center" alt=""><![CDATA[
  0  1  2  3  4  5  6  7
+--+--+--+--+--+--+--+--+
| reserved  |IE|v3|v2|v1|
+--+--+--+--+--+--+--+--+
]]></artwork>
</figure>

         <t>
	         <list style="symbols">
		        <t>
				   The
        <ul spacing="normal">
          <li>The least significant bit, bit 7 (bit 7) indicates support for IGMP version
	  1. Since IGMP V1 IGMPv1 is being deprecated deprecated, the sender MUST <bcp14>MUST</bcp14> set
	  it as to 0 for IGMP and the receiver MUST <bcp14>MUST</bcp14> ignore it.
				</t>
				<t>
				   The
	  </li>
          <li>The second least significant bit, bit 6 (bit 6) indicates support for IGMP
	  version 2.
				</t>
				<t>
				   The
	  </li>
          <li>The third least significant bit, bit 5 (bit 5) indicates support for IGMP
	  version 3.
				</t>
				<t>
				   The
	  </li>
          <li>The fourth least significant bit, bit 4 (bit 4) indicates whether the (S,G)
	  information carried within the route-type route type is of an Include Group type
	  (bit value 0) or an Exclude Group type (bit value 1). The Exclude
	  Group type bit MUST <bcp14>MUST</bcp14> be ignored if bit 5 is not set.
				</t>
				<t>
				   This
	  </li>
          <li>This EVPN route type is used to carry tenant IGMP multicast group
	  information. The flag Flags field assists in distributing the IGMP Membership
	  Report of a given host for a given multicast route. The version
	  bits help associate the IGMP version of receivers participating within
	  the EVPN domain.
				</t>
				<t>
				   The include/exclude (IE)
	  </li>
          <li>The IE bit helps in creating filters for a given
	  multicast route.
				</t>
				<t>
				   If
	  </li>
          <li>If the route is used for IPv6 (MLD) (MLD), then bit 7 indicates support for MLD
	  version 1. The second least significant bit, bit 6 (bit 6) indicates support
	  for MLD version 2. Since there is no MLD version 3, in case of IPv6
				   route
	  routes, the third least significant bit MUST <bcp14>MUST</bcp14> be 0. In case of IPv6 routes,
	  the fourth least significant bit MUST <bcp14>MUST</bcp14> be ignored if bit 6 is not
	  set.

				</t>
				<t>
	  </li>
          <li> Reserved bits MUST <bcp14>MUST</bcp14> be set to 0 by sender. And the sender, and the receiver MUST
	  <bcp14>MUST</bcp14> ignore the Reserved bits.
			</t>
		     </list>
	     </t>
	  </li>
        </ul>
        <section title="Constructing numbered="true" toc="default">
          <name>Constructing the Selective Multicast Ethernet Tag route">
		     <t>
			     This Route</name>
          <t>This section describes the procedures used to construct the Selective
			     Multicast Ethernet Tag (SMET) SMET route.
          </t>

			 <t>
				    The
          <t>The Route Distinguisher (RD) SHOULD <bcp14>SHOULD</bcp14> be a Type 1 RD <xref target="RFC4364"/>.
	  target="RFC4364" format="default"/>.  The
	  value field comprises an IP address of the PE (typically, the
	  loopback address) address), followed by a number unique to the PE.
          </t>

		     <t>
			     The
          <t>The Ethernet Tag ID MUST <bcp14>MUST</bcp14> be set set, as per the procedure
	  defined in <xref target="RFC7432"/>. target="RFC7432" format="default"/>.
          </t>

			 <t>
				    The
          <t>The Multicast Source Length MUST <bcp14>MUST</bcp14> be set to the length of the multicast Multicast
	  Source address Address in bits. If the Multicast Source Address field
	  contains an IPv4 address, then the value of the Multicast Source
	  Length field is 32. If the Multicast Source Address field contains an
	  IPv6 address, then the value of the Multicast Source Length field is
	  128. In case of a (*,G) Membership Report, the Multicast Source Length is set to
	  0.
          </t>

			 <t>
				    The
          <t>The Multicast Source Address is the source IP address from the IGMP
	  Membership Report.
	  In case of a (*,G), (*,G) Membership Report, this field is not used.
          </t>

			 <t>
				 The
          <t>The Multicast Group Length MUST <bcp14>MUST</bcp14> be set to the length of multicast group
				 address the Multicast Group
	  Address in bits. If the Multicast Group Address  field contains an
	  IPv4 address, then the value of the Multicast Group Length field is
	  32.  If the Multicast Group Address field contains an IPv6 address,
	  then the value of the Multicast Group Length field is 128.
          </t>

			 <t>
				 The
          <t>The Multicast Group Address is the Group group address from the IGMP or MLD
	  Membership Report.
          </t>

			 <t>
				 The
          <t>The Originator Router Length is the length of the Originator Router
	  Address in bits.
          </t>

			 <t>
				    The
          <t>The Originator Router Address is the IP address of the router originating this route.
	  The SMET Originator Router IP address MUST <bcp14>MUST</bcp14> match that of the IMET (or
	  S-PMSI AD) Authentic Data (AD))
	  route originated for the same EVI by the same downstream PE.
          </t>

			 <t>
				    The
          <t>The Flags field indicates the version of IGMP protocol from which the
	  Membership Report was received. It also indicates whether the
	  multicast group had the INCLUDE or EXCLUDE Include/Exclude bit set.
          </t>
          <t> Reserved bits MUST <bcp14>MUST</bcp14> be set to 0. They can be defined in future
	  by other document. documents in the future. </t>

			 <t>
				    IGMP
          <t>IGMP is used to receive group membership information from hosts
	  by TORs. Top-of-the-Rack (ToR) switches. Upon receiving the hosts host's expression of interest of in a
	  particular group membership, this information is then forwarded using the
	  SMET route. The NLRI also keeps track
	  of the receiver's IGMP protocol version and any source filtering for a
	  given group membership. All EVPN SMET routes are announced with per- per EVI
	  Route Target extended communities. communities (EVI-RT ECs).
          </t>
        </section>
        <section title="Reconstructing IGMP / MLD numbered="true" toc="default">
          <name>Reconstructing IGMP/MLD Membership Reports from the Selective Multicast Route"> Route</name>
          <t>  This section describes the procedures used to reconstruct IGMP / MLD IGMP/MLD Membership
	  Reports from the SMET route.
          </t>
			 <t>
				 <list style="symbols">
					 <t>
          <ul spacing="normal">
            <li> If multicast group length the Multicast Group Length is 32, the route would be is
	    translated to the IGMP membership request. Membership Request. If multicast group length the Multicast Group
	    Length is 128, the route would be is translated to an MLD membership request.
						 </t>

                           <t>
	    Membership Request. </li>
            <li>The Multicast group address Group Address field would be is translated to IGMP / MLD
	    the IGMP/MLD group address.
                         </t>
                         <t> address.</li>
            <li> If the Multicast source length Source Length is set to zero 0, it would be is
	    translated to any source (*).
            If multicast source length the Multicast Source Length is non zero, non-zero, the Multicast source address Source
	    Address field would be is translated to IGMP / MLD the IGMP/MLD source address.
                         </t>
                         <t> address.</li>
            <li> If flag bit 7 is set, it translates the Membership report Report to be IGMP V1
	    IGMPv1 or MLD V1.
                         </t>
                         <t> MLDv1.</li>
            <li> If flag bit 6 is set, it translates the Membership report Report to be IGMP V2
	    IGMPv2 or MLD V2.
                         </t>
                         <t> MLDv2.</li>
	    <li> Flag bit 5 is only valid for the IGMP Membership report and Report; if it is
	    set, it translates to IGMP V3 report.
                         </t>
                           <t> the IGMPv3 report.</li>
            <li> If the IE flag is set, it translate translates to IGMP / MLD the IGMP/MLD Exclude
	    mode membership report. Membership Report. If the IE flag is not set (zero), (0), it
	    translates to the Include mode membership report.
                                 </t>
                                 </list>
            </t> Membership Report. </li>
          </ul>
        </section>
        <section title="Default numbered="true" toc="default">
          <name>Default Selective Multicast Route">
			 <t>
				    If Route</name>
          <t>If there is a multicast router connected behind the EVPN domain, the PE
				    MAY
	  <bcp14>MAY</bcp14> originate a default SMET (*,*) to get all multicast traffic in
				    domain.
			 </t>
	  the domain.</t>
	  <figure  > anchor="EVPN-domain">
	    <name>Multicast Router behind the EVPN Domain</name>
          <artwork ><![CDATA[ name="" type="" align="center" alt=""><![CDATA[
                       +--------------+
                       |              |
                       |              |
                       |              | +----+
                       |              | |    |---- H1(*,G1)v2
                       |   IP/MPLS    | | PE1|---- H2(S2,G2)v3
                       |   Network    | |    |---- S2
                       |              | |    |
                       |              | +----+
                       |              |
                +----+ |              |
+----+          |    | |              |
|    |    S1 ---| PE2| |              |
|PIM |----R1 ---|    | |              |
|ASM |          +----+ |              |
|    |                 |              |
+----+                 +--------------+

   Figure 2: Multicast Router behind EVPN domain
]]></artwork>
	  </figure>

<t>
	   Consider
          <t>Consider the EVPN network of Figure-2, in <xref target="EVPN-domain"/>, where there is an EVPN
	   instance configured across the PEs. Let's consider that PE2 is connected to
	   multicast router R1 and there is a network running PIM ASM behind R1.
	   If there are receivers behind the PIM ASM network network, the PIM Join would
	   be forwarded to the PIM RP (Rendezvous Point). Rendezvous Point (RP). If receivers behind the
	   PIM ASM network are interested in a multicast flow originated by
	   multicast source S2 (behind PE1), it is necessary for PE2 to receive
	   multicast traffic. In this case case, PE2 MUST <bcp14>MUST</bcp14> originate a (*,*) SMET route
	   to receive all of the multicast traffic in the EVPN domain. To generate
	   Wildcards
	   wildcard (*,*) routes, the procedure from <xref target="RFC6625"/> MUST target="RFC6625" format="default"/>
	   <bcp14>MUST</bcp14> be used.
</t> used.</t>
        </section>
      </section>
      <section title="Multicast numbered="true" toc="default">
        <name>Multicast Membership Report Synch Route">

			 <t>
				    This Route</name>
        <t>This EVPN route type is used to coordinate the IGMP Membership Report (x,G)
	state for a given BD between the PEs attached to a given ES operating in All-
				    Active
	All-Active (or Single-Active) redundancy mode mode, and it consists of
				    following:
			 </t>

			     		  <figure  > the
	following:</t>
<artwork ><![CDATA[

	     +--------------------------------------------------+ name="" type="" align="center" alt=""><![CDATA[+--------------------------------------------------+
|  RD (8 octets)                                   |
+--------------------------------------------------+
|  Ethernet Segment Identifier (10 octets)         |
+--------------------------------------------------+
|  Ethernet Tag ID  (4 octets)                     |
+--------------------------------------------------+
|  Multicast Source Length (1 octet)               |
+--------------------------------------------------+
|  Multicast Source Address (variable)             |
+--------------------------------------------------+
|  Multicast Group Length (1 octet)                |
+--------------------------------------------------+
|  Multicast Group Address (Variable)              |
+--------------------------------------------------+
|  Originator Router Length (1 octet)              |
+--------------------------------------------------+
|  Originator Router Address (variable)            |
+--------------------------------------------------+
|  Flags (1 octet)                                 |
+--------------------------------------------------+
]]></artwork>
</figure>

			<t>
				   For
        <t>For the purpose of BGP route key processing, all the fields are
	considered to be part of the prefix in the NLRI NLRI, except for the one-
				   octet 1-octet
	Flags field, whose fields are defined as follows:
			</t>
			     		  <figure  > follows:</t>
        <artwork ><![CDATA[ name="" type="" align="center" alt=""><![CDATA[
  0  1  2  3  4  5  6  7
+--+--+--+--+--+--+--+--+
| reserved  |IE|v3|v2|v1|
+--+--+--+--+--+--+--+--+
]]></artwork>
</figure>

           <t>
	           <list style="symbols">
		           <t>
        <ul spacing="normal">
          <li> The least significant bit, bit 7 (bit 7) indicates support for IGMP version 1. </t>
			       <t> </li>
          <li> The second least significant bit, bit 6 (bit 6) indicates support for IGMP version 2. </t>
			       <t> </li>
          <li> The third least significant bit, bit 5 (bit 5) indicates support for IGMP version 3. </t>
			       <t> </li>
          <li> The fourth least significant bit, bit 4 (bit 4) indicates whether the (S, G) information
	  carried within the route-type route type is of an Include Group type (bit value 0) or an Exclude Group
	  type (bit value 1). The Exclude Group type bit MUST <bcp14>MUST</bcp14> be ignored if bit 5 is
	  not set. </t>
				   <t> </li>
          <li> Reserved bits MUST <bcp14>MUST</bcp14> be set to 0.
			</t>
		       </list>

	       </t>

	       <t>
		       The 0.</li>
        </ul>
        <t>The Flags field assists in distributing the IGMP Membership Report of a
	given host for a given multicast route. The version bits help
	associate the IGMP version of receivers participating within the EVPN
	domain.  The include/exclude Include/Exclude bit helps in creating filters for a
	given multicast route.
		   </t>

		   <t>
			     If route.</t>
        <t>If the route is being prepared for IPv6 (MLD) (MLD), then bit 7 indicates
	support for MLD version 1. The second least significant bit, bit 6 (bit 6)
	indicates support for MLD version 2. Since there is no MLD version 3,
	in case of the IPv6 route route, the third least significant bit MUST <bcp14>MUST</bcp14>
	be 0. In case of the IPv6 route, the fourth least significant bit MUST <bcp14>MUST</bcp14>
	be ignored if bit 6 is not set.
		   </t> set.</t>
        <section title="Constructing numbered="true" toc="default">
          <name>Constructing the Multicast Membership Report Synch Route">
			   <t>
				      This Route</name>
          <t>This section describes the procedures used to construct the IGMP Membership Report
	  Synch route.  Support for these route types is optional. If a PE does
	  not support this route, then it MUST NOT <bcp14>MUST NOT</bcp14> indicate that it supports
				      'IGMP proxy'
	  "IGMP Proxy" in the Multicast Flag extended community Flags Extended Community for the EVIs
	  corresponding to its multi-homed Ethernet Segments (ESs).
			   </t>

			   <t>
				      An multihomed ESs.</t>
          <t>An IGMP Membership Report Synch route MUST <bcp14>MUST</bcp14> carry exactly one
	  ES-Import Route
	  Target extended community, i.e., the one that corresponds to the ES on
	  which the IGMP Membership Report was received.  It MUST <bcp14>MUST</bcp14> also carry
	  exactly one EVI-RT EC, i.e., the one that corresponds to the EVI on
	  which the IGMP Membership Report
	  was received.  See <xref target="evi-rt"/> target="evi-rt" format="default"/> for details on how to
	  encode and construct the EVI-RT EC.
			   </t>

			   <t>
				      The Route Distinguisher (RD) SHOULD EC.</t>
          <t>The RD <bcp14>SHOULD</bcp14> be a Type 1 RD <xref target="RFC4364"/>.
	  target="RFC4364" format="default"/>.  The
	  value field comprises an IP address of the PE (typically, the
	  loopback address) address), followed by a number unique to the PE.
			   </t>

			   <t>
				      The PE.</t>
          <t>The Ethernet Segment Identifier (ESI) MUST <bcp14>MUST</bcp14> be set to the 10-octet
	  value defined for the ES.
			   </t>

			   <t>
				   The ES.</t>
          <t>The Ethernet Tag ID MUST <bcp14>MUST</bcp14> be set set, as per the procedure defined in
	  <xref target="RFC7432"/>.
			   </t>

			   <t>
			      The target="RFC7432" format="default"/>.</t>
          <t>The Multicast Source length MUST Length <bcp14>MUST</bcp14> be set to the
	  length of the Multicast Source
			      address
	  Address in bits. If the Multicast Source field contains an IPv4
	  address, then the value of the Multicast Source Length field is 32.
	  If the Multicast Source field contains an IPv6 address, then the
	  value of the Multicast Source Length field is 128. In case of a (*,G)
	  Membership Report, the Multicast Source Length is set to 0.

			   </t>

			   <t>
				   The 0.</t>
          <t>The Multicast Source is the Source source IP address of the IGMP Membership
	  Report.  In case of a (*,G) Membership Report, this field does not exist.
			   </t>

			   <t>
				      The exist.</t>
          <t>The Multicast Group length MUST Length <bcp14>MUST</bcp14> be set to the length of multicast group
				      address the
	  Multicast Group
	  Address in bits. If the Multicast Group field contains an IPv4
	  address, then the value of the Multicast Group Length field is 32.
	  If the Multicast Group field contains an IPv6 address, then the value
	  of the Multicast Group Length field is 128.
			   </t>

				<t>
					The 128.</t>
          <t>The Multicast Group is the Group group address of the IGMP Membership
					Report.
			    </t>

				<t>
					   The
	  Report.</t>
          <t>The Originator Router Length is the length of the Originator Router
					   address
	  Address in bits.
			    </t>

			   <t>
				      The bits.</t>
          <t>The Originator Router Address is the IP address of Router Originating the prefix.
			   </t>

			   <t>
				      The router originating the prefix.</t>
          <t>The Flags field indicates the version of IGMP protocol from which the
	  Membership Report was received. It also indicates whether the
	  multicast group had INCLUDE or EXCLUDE the Include/Exclude bit set.
			   </t> set.</t>
          <t> Reserved bits MUST <bcp14>MUST</bcp14> be set to 0.
			</t> 0.</t>
        </section>
        <section title="Reconstructing IGMP / MLD numbered="true" toc="default">
          <name>Reconstructing IGMP/MLD Membership Reports from a Multicast Membership
	  Report Sync Route"> Synch Route</name>
          <t>  This section describes the procedures used to reconstruct IGMP / MLD IGMP/MLD
	  Membership Reports from the Multicast Membership Report Sync route.
                         </t>
			 <t>
				 <list style="symbols">
					 <t> Synch route.</t>
          <ul spacing="normal">
            <li> If multicast group length the Multicast Group Length is 32, the route would be is translated
	    to the IGMP membership request. Membership Request. If multicast group length the Multicast Group Length is 128,
	    the route would be is translated to an MLD membership request.
						 </t>

                           <t> Membership Request. </li>
            <li> The Multicast group address Group Address field would be is translated to IGMP / MLD the
	    IGMP/MLD group address.
                         </t>
                         <t> address.</li>
            <li> If the Multicast source length Source Length is set to zero 0, it would be is translated to
	    any source (*). If multicast source length the Multicast Source Length is non zero, non-zero, the
	    Multicast source address Source
	    Address field would be is translated to IGMP / MLD the IGMP/MLD source address.
                         </t>
                         <t> address.</li>
            <li> If flag bit 7 is set, it translates the Membership report Report to be IGMP V1
	    IGMPv1 or MLD V1.
                         </t>
                         <t> MLDv1.</li>
            <li> If flag bit 6 is set, it translates the Membership report Report to be IGMP V2
	    IGMPv2 or MLD V2.
                         </t>
                         <t> MLDv2.</li>
            <li> Flag bit 5 is only valid for the IGMP Membership report and Report; if it is
	    set, it translates to IGMP V3 report.
                         </t>
                           <t> the IGMPv3 report.</li>
            <li> If the IE flag is set, it translate translates to IGMP / MLD the IGMP/MLD Exclude mode membership report.
	    Membership Report. If the IE flag is not set (zero), (0), it translates to the
	    Include mode membership report.
                                 </t>
                                 </list>
            </t> Membership Report. </li>
          </ul>
        </section>
      </section>
      <section title="Multicast numbered="true" toc="default">
        <name>Multicast Leave Synch Route">
			 <t>
				 This Route</name>
        <t>This EVPN route type is used to coordinate the IGMP Leave Group (x,G)
	state for a given BD between the PEs attached to a given ES operating
	in an All-Active (or Single-Active) redundancy mode mode, and it consists of
				 following:
			 </t>

			 			     		  <figure  > the
	following:</t>
        <artwork ><![CDATA[ name="" type="" align="center" alt=""><![CDATA[
+--------------------------------------------------+
|  RD (8 octets)                                   |
+--------------------------------------------------+
|  Ethernet Segment Identifier (10 octets)         |
+--------------------------------------------------+
|  Ethernet Tag ID  (4 octets)                     |
+--------------------------------------------------+
|  Multicast Source Length (1 octet)               |
+--------------------------------------------------+
|  Multicast Source Address (variable)             |
+--------------------------------------------------+
|  Multicast Group Length (1 octet)                |
+--------------------------------------------------+
|  Multicast Group Address (Variable)              |
+--------------------------------------------------+
|  Originator Router Length (1 octet)              |
+--------------------------------------------------+
|  Originator Router Address (variable)            |
+--------------------------------------------------+
|  Reserved (4 octet) octets)                              |
+--------------------------------------------------+
|  Maximum Response Time (1 octet)                 |
+--------------------------------------------------+
|  Flags (1 octet)                                 |
+--------------------------------------------------+
]]></artwork>
</figure>

          <t>
	             For
        <t>For the purpose of BGP route key processing, all the fields are
	considered to be part of the prefix in the NLRI NLRI, except for the Reserved,
	Maximum Response Time Time, and the one-octet 1-octet Flags field, whose fields fields, which are defined as follows:
	       </t>

				 			     		  <figure  > follows:</t>
        <artwork ><![CDATA[ name="" type="" align="center" alt=""><![CDATA[
  0  1  2  3  4  5  6  7
+--+--+--+--+--+--+--+--+
| reserved  |IE|v3|v2|v1|
+--+--+--+--+--+--+--+--+
]]></artwork>
</figure>

            <t>
	            <list style="symbols">
		               <t>
        <ul spacing="normal">
          <li>  The least significant bit, bit 7 (bit 7) indicates support for IGMP version 1. </t>
		               <t> </li>
          <li>  The second least significant bit, bit 6 (bit 6) indicates support for IGMP version 2. </t>
		               <t> </li>
          <li>  The third least significant bit, bit 5 (bit 5) indicates support for IGMP version 3. </t>
		               <t> </li>
          <li>  The fourth least significant bit, bit 4 (bit 4) indicates whether the (S, G) information
	  carried within the route-type route type is of an Include Group type (bit value 0) or an Exclude Group
	  type	(bit value 1). The Exclude Group type bit MUST <bcp14>MUST</bcp14> be ignored if bit 5
	  is not set. </t>
			           <t> </li>
          <li> Reserved bits MUST <bcp14>MUST</bcp14> be set to 0. They can be defined in future by
	  other document.
			</t>
		        </list>
	        </t>

	        <t>
		           The documents in the future. </li>
        </ul>
        <t>The Flags field assists in distributing the IGMP Membership Report of a
	given host for a given multicast route. The version bits help
	associate the IGMP version of the receivers participating within the EVPN
	domain.  The include/exclude Include/Exclude bit helps in creating filters for a
	given multicast route.
		    </t>

		    <t>
			       If route.</t>
        <t>If the route is being prepared for IPv6 (MLD) (MLD), then bit 7 indicates
	support for MLD version 1. The second least significant bit, bit 6 (bit 6)
	indicates support for MLD version 2. Since there is no MLD version 3,
	in case of the IPv6 route route, the third least significant bit MUST <bcp14>MUST</bcp14> be 0. In case
	of the IPv6 route, the fourth least significant bit MUST <bcp14>MUST</bcp14> be ignored if
	bit 6 is not set.
			</t> set.</t>
        <t> Reserved bits in the flag MUST <bcp14>MUST</bcp14> be set to 0. They can be
	defined in future by other document. documents in the future. </t>
        <section title="Constructing numbered="true" toc="default">
          <name>Constructing the Multicast Leave Synch Route">
				<t>
					This Route</name>
          <t>This section describes the procedures used to construct the IGMP
	  Leave Synch route.  Support for these route types is optional. If a PE
	  does not support this route, then it MUST NOT <bcp14>MUST NOT</bcp14> indicate that it
	  supports 'IGMP proxy' "IGMP Proxy" in the Multicast Flag extended community Flags Extended Community for the
	  EVIs corresponding to its multi-homed multihomed Ethernet Segments.
			    </t>

			    <t>
				       An segments.</t>
          <t>An IGMP Leave Synch route MUST <bcp14>MUST</bcp14> carry exactly one ES-Import Route
	  Target extended community, i.e., the one that corresponds to the ES on
	  which the IGMP Leave was received.  It MUST <bcp14>MUST</bcp14> also carry exactly one
	  EVI-RT EC, i.e., the one that corresponds to the EVI on which the IGMP
	  Leave was received.  See Section 9.5 <xref target="evi-rt"/> for details on how to form the
	  EVI-RT EC.
				</t>

				<t>
					   The Route Distinguisher (RD) SHOULD EC.</t>
          <t>The RD <bcp14>SHOULD</bcp14> be a Type 1 RD <xref target="RFC4364"/>.
	  target="RFC4364" format="default"/>.  The
	  value field comprises an IP address of the PE (typically, the
	  loopback address) address), followed by a number unique to the PE.
			    </t>

			    <t>
				       The Ethernet Segment Identifier (ESI) MUST PE.</t>
          <t>The ESI <bcp14>MUST</bcp14> be set to the 10-octet
	  value defined for the ES.
				</t>
				<t>
					The ES.</t>
          <t>The Ethernet Tag ID MUST <bcp14>MUST</bcp14> be set set, as per the procedure
	  defined in <xref target="RFC7432"/>.
				</t>

				<t>
					The target="RFC7432" format="default"/>.</t>
          <t>The Multicast Source length MUST Length <bcp14>MUST</bcp14> be set to the length
	  of multicast source
					address the Multicast Source
	  Address in bits. If the Multicast Source field contains an IPv4
	  address, then the value of the Multicast Source Length field is 32.
	  If the Multicast Source field contains an IPv6 address, then the
	  value of the Multicast Source Length field is 128. In case of a (*,G)
	  Membership Report, the Multicast Source Length is set to 0.
				</t>

				<t>
					   The 0.</t>
          <t>The Multicast Source is the Source source IP address of the IGMP Membership
	  Report.  In case of a (*,G) Membership Report, this field does not exist.
				</t>

				<t>
					   The exist.</t>
          <t>The Multicast Group length MUST Length <bcp14>MUST</bcp14> be set to the length of multicast group
					   address the
	  Multicast Group
	  Address in bits. If the Multicast Group field contains an IPv4
	  address, then the value of the Multicast Group Length field is 32.
	  If the Multicast Group field contains an IPv6 address, then the value
	  of the Multicast Group Length field is 128.
				</t>

				<t>
					   The 128.</t>
          <t>The Multicast Group is the Group group address of the IGMP Membership Report.
			    </t>

			    <t>
				       The Report.</t>
          <t>The Originator Router Length is the length of the Originator Router
				       address Address
	  in bits.
				</t>

				<t>
					   The bits.</t>
          <t>The Originator Router Address is the IP address of Router Originating the prefix.
				</t> router
	  originating the prefix.</t>
          <t> The Reserved field is not part of the route key. The originator MUST <bcp14>MUST</bcp14> set
	  the reserved Reserved field to Zero , 0;
	  the receiver SHOULD <bcp14>SHOULD</bcp14> ignore it it, and if it needs to be propagated, it MUST
	  <bcp14>MUST</bcp14> propagate it unchanged
				</t> unchanged.</t>
          <t> The Maximum Response Time is the value to be used while sending query a query, as defined in
	  <xref target="RFC2236"/>
				</t>

				<t>
					   The target="RFC2236" format="default"/>.</t>
          <t>The Flags field indicates the version of IGMP protocol from which the
	  Membership Report was received. It also indicates whether the
	  multicast group had INCLUDE or EXCLUDE an Include/Exclude bit set.
				</t> set.</t>
        </section>
        <section title="Reconstructing IGMP / MLD numbered="true" toc="default">
          <name>Reconstructing IGMP/MLD Leave from a Multicast Leave Sync Route">
			 			                          <t>  This Synch Route</name>
          <t>This section describes the procedures used to reconstruct IGMP / MLD IGMP/MLD Leave from
	  the Multicast Leave Sync route.
                         </t>
			 <t>
				 <list style="symbols">
					 <t> Synch route.</t>
          <ul spacing="normal">
            <li> If multicast group length the Multicast Group Length is 32, the route would be is translated
	    to IGMP Leave. If multicast group length the
	    Multicast Group Length is 128, the route would be is translated to MLD Leave.
						 </t>

                           <t>
	    Leave.</li>
            <li> The Multicast group address Group Address field would be is translated to IGMP / MLD an
	    IGMP/MLD group address.
                         </t>
                         <t> address.</li>
            <li> If the Multicast source length Source Length is set to zero 0, it would be is
	    translated to any source (*).
            If multicast source length the Multicast Source Length is non zero, non-zero, the Multicast source address Source
	    Address field would be is translated to IGMP / MLD the IGMP/MLD source address.
                         </t>
                         <t> address.</li>
            <li> If flag bit 7 is set, it translates the Membership report Report to be IGMP V1
	    IGMPv1 or MLD V1.
                         </t>
                         <t> MLDv1.</li>
            <li> If flag bit 6 is set, it translates the Membership report Report to be IGMP V2
	    IGMPv2 or MLD V2.
                         </t>
                         <t> MLDv2.</li>
            <li> Flag bit 5 is only valid for the IGMP Membership report and Report; if it is set, it
	    translates to IGMP V3 report.
                         </t>
                           <t> the IGMPv3 report.</li>
            <li> If the IE flag is set, it translate translates to IGMP / MLD the IGMP/MLD Exclude mode Leave.
	    If the IE flag is not set (zero), (0), it translates to the Include mode Leave.
                                 </t>
                                 <t>
	                                 </t>
                                 </list>
            </t> </li>
          </ul>
        </section>
      </section>
      <section title="Multicast numbered="true" toc="default">
        <name>Multicast Flags Extended Community">
			 <t>
				    The 'Multicast Flags' extended community Community</name>
        <t>The Multicast Flags Extended Community is a new EVPN extended
				    community. Extended
	Community.  EVPN extended communities Extended Communities are transitive extended
	communities with a Type field value Value of 6. 0x06.  IANA will assign a Sub-Type
				    from has assigned 0x09 to Multicast Flags Extended Community in the 'EVPN "EVPN Extended Community Sub-Types' registry.
			 </t>

			 <t>
				 A Sub-Types" subregistry.</t>
        <t>A PE that supports IGMP and/or the MLD Proxy on a given BD
				 MUST
	<bcp14>MUST</bcp14> attach this extended community to the IMET route it
	advertises
				 advertises for that BD BD, and it MUST <bcp14>MUST</bcp14> set the IGMP and/or MLD Proxy
	Support flags to 1. Note that an <xref target="RFC7432"/> compliant a PE compliant with <xref target="RFC7432" format="default"/>
	will not advertise this
	extended community community, so its absence indicates that the advertising PE
	does not support either IGMP or MLD Proxy.
			</t>

			<t>
				The Proxies.</t>
        <t>The advertisement of this extended community enables a more efficient
	multicast tunnel setup from the source PE specially for ingress
				replication -
	replication, i.e., if an egress PE supports the IGMP proxy Proxy but doesn't
	have any interest in a given (x,G), it advertises its IGMP proxy Proxy
	capability using this extended community community, but it does not advertise
	any SMET route for that (x,G). When the source PE (ingress PE)
	receives such advertisements from the egress PE, it does not
	replicate the multicast traffic to that egress PE; however, it does
	replicate the multicast traffic to the egress PEs that don't
	advertise such capability capability, even if they don't have any interests in
	that (x,G).
			</t>

			<t>
				   A (x,G).</t>
        <t>A Multicast Flags extended community Extended Community is encoded as an 8-octet value, value
	as follows:
			</t>

<figure  > follows:</t>
        <artwork ><![CDATA[ name="" type="" align="center" alt=""><![CDATA[
 0                   1                   2                   3
 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type=0x06     |Sub-Type=0x09  |     Flags (2 Octets)      |M|I|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|                           Reserved=0                          |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
]]></artwork>
</figure>

          <t>
	             The

        <t>The low-order (lease (least significant) two 2 bits are defined as the "IGMP
	Proxy Support Support" and MLD "MLD Proxy Support" bit. bits (see <xref target="multicast_flags_extended_community"/>. The absence of this
	extended community also means that the PE does not support the IGMP
	             proxy. where:
          </t>
          <t>
	          <list style="symbols">
		          <t>
	Proxy, where:</t>
        <ul spacing="normal">
          <li> The Type is 0x06 0x06, as registered with IANA for EVPN Extended Communities. </t>
		            <t> </li>
          <li> The Sub-Type : 0x09</t>
		              <t>
			              Flags are two Octets value.
				              <list style="symbols">
					              <t> is 0x09.</li>
          <li>
            <t>Flags are 2-octet values.</t>

            <ul spacing="normal">
              <li> Bit 15 (shown as I) defines IGMP Proxy Support. Value The value of 1 for
	      bit 15 means that the PE supports the IGMP Proxy. Value The value of 0 for bit 15
	      means that the PE does not supports support the IGMP Proxy.</t>
					              <t>Bit Proxy.</li>
              <li>Bit 14 (shown as M) defines MLD Proxy Support. Value The value of 1 for
	      bit 14 means that the PE supports the MLD Proxy. Value The value of 0 for bit 14
	      means that the PE does not support the MLD proxy. </t>
					              <t>Bit Proxy. </li>
              <li>Bits 0 to 13 are reserved for the future. Sender MUST The sender <bcp14>MUST</bcp14>
	      set it 0 to 0, and the receiver MUST <bcp14>MUST</bcp14> ignore it. </t>
					          </list>

				          </t>

		                <t> </li>
            </ul>
          </li>
          <li> Reserved bits are set to 0. Sender MUST The sender <bcp14>MUST</bcp14> set it to 0 0,
	  and the receiver MUST <bcp14>MUST</bcp14> ignore it.</t>
		      </list>
	      </t> it.</li>
        </ul>
        <t> If a router does not support this specification, it MUST NOT <bcp14>MUST NOT</bcp14> add
	the Multicast Flags Extended Community
	in the BGP route. A When a router receiving receives a BGP update,
	if both M and I both flag flags are zero (0), 0, the router MUST <bcp14>MUST</bcp14> treat this Update update as
	malformed.  Receiver  The receiver of such an
	update MUST <bcp14>MUST</bcp14> ignore the extended community. </t>
      </section>
      <section title="EVI-RT anchor="evi-rt" numbered="true" toc="default">
        <name>EVI-RT Extended Community" anchor="evi-rt">

			 <t>
				        In Community</name>
        <t>In EVPN, every EVI is associated with one or more Route Targets
				        (RTs). Targets.  These Route Targets RTs serve two functions:
				        <list style="numbers">
					        <t>
						        Distribution functions:</t>
        <ol spacing="normal" type="1">
	  <li>Distribution control: RTs control the distribution of the
	  routes.  If a route carries the RT associated with a particular
	  EVI, it will be distributed to all the PEs on which that EVI
						          exists.
						    </t>
						    <t>
							    EVI
	  exists.</li>
          <li>EVI identification: Once a route has been received by a
	  particular PE, the RT is used to identify the EVI to which it
							    applies.
						    </t>
					    </list>

			 </t>

			 <t>
				        An
	  applies.</li>
        </ol>
        <t>An IGMP Membership Report Synch or IGMP Leave Synch route is associated with a
	particular combination of ES and EVI.  These routes need to be
	distributed only to PEs that are attached to the associated ES.
				          Therefore
	Therefore, these routes carry the ES-Import RT for that ES.
			</t>

			<t>
				       Since ES.</t>
        <t>Since an IGMP Membership Report Synch or IGMP Leave Synch route does not need
	to be distributed to all the PEs on which the associated EVI
	exists, these routes cannot carry the RT associated with that
	EVI. Therefore, when such a route arrives at a particular PE, the
	route's RTs cannot be used to identify the EVI to which the route
	applies. Some other means of associating the route with an EVI
	must be used.
		    </t>

		    <t>
			           This used.</t>
        <t>This document specifies four new Extended Communities (EC) ECs that
	can be used to identify the EVI with which a route is associated, associated
	but which do not have any effect on the distribution of the
	route.  These new ECs are known as the "Type 0 EVI-RT EC", the
	"Type 1 EVI-RT EC", the "Type 2 EVI-RT EC", and the "Type 3 EVI-RT EC".
			            <list style="numbers">
				            <t> EC".</t>

        <ol spacing="normal" type="1">
	  <li> A Type 0 EVI-RT EC is an EVPN EC (type 6) of sub-type 0xA.</t>
				            <t> 0xA.</li>
          <li> A Type 1 EVI-RT EC is an EVPN EC (type 6) of sub-type 0xB.</t>
				            <t> 0xB.</li>
          <li> A Type 2 EVI-RT EC is an EVPN EC (type 6) of sub-type 0xC.</t>
				            <t> 0xC.</li>
          <li> A Type 3 EVI-RT EC is an EVPN EC (type 6) of sub-type 0xD</t>
				        </list>
			</t>

			<t>
				Each 0xD</li>
        </ol>
        <t>Each IGMP Membership Report Synch or IGMP Leave Synch route MUST <bcp14>MUST</bcp14>
	carry exactly
	one EVI-RT EC.  The EVI-RT EC carried by a particular route is
	constructed as follows.  Each such route is the result of having
	received an IGMP Membership Report or an IGMP Leave message from a particular
	BD. The route is said to be associated with that BD.
	For each BD, there is a corresponding RT that is used to ensure
	that routes "about" that BD are distributed to all PEs attached
	to that BD.  So suppose a given IGMP Membership Report Synch or Leave Synch
	route is associated with a given BD, say BD1, and suppose that
	the corresponding RT for BD1 is RT1. Then:

				<list style="symbols">
					<t> 0. If Then:</t>
        <ul spacing="normal">
          <li>If RT1 is a Transitive Two-Octet AS-specific EC, then the EVI-
						RT EVI-RT
	  EC carried by the route is a Type 0 EVI-RT EC.  The value
	  field of the Type 0 EVI-RT EC is identical to the value field of
	  RT1. </t>

					<t> 1. If </li>
          <li>If RT1 is a Transitive IPv4-Address-specific EC, then the EVI-
						RT EVI-RT
	  EC carried by the route is a Type 1 EVI-RT EC.  The value
	  field of the Type 1 EVI-RT EC is identical to the value field of
	  RT1. </t>
					<t> 2. If </li>
          <li>If RT1 is a Transitive Four-Octet-specific Four-Octet AS-specific EC, then the EVI-RT
	  EC carried by the route is a Type 2 EVI-RT EC.  The value field
	  of the Type 2 EVI-RT EC is identical to the value field of RT1.</t>

					<t> 3. If RT1.</li>
          <li>If RT1 is a Transitive IPv6-Address-specific EC, then the EVI-RT
	  EC carried by the route is a Type 3 EVI-RT EC.  The value
	  field of the Type 3 EVI-RT EC is identical to the value field of
						 RT1.
					</t>

				</list>
			</t>

			<t>
				       An
	  RT1.</li>
        </ul>
        <t>An IGMP Membership Report Synch or Leave Synch route MUST <bcp14>MUST</bcp14>
	carry exactly one EVI-RT EC.
			</t>

			<t>
				       Suppose EC.</t>
        <t>Suppose a PE receives a particular IGMP Membership Report Synch or IGMP Leave
	Synch route, say R1, and suppose that R1 carries an ES-Import RT
	that is one of the PE's Import RTs.  If R1 has no EVI-RT EC, EC or
	has more than one EVI-RT EC, the PE MUST <bcp14>MUST</bcp14> apply the "treat-as-withdraw"
	procedure of per <xref target="RFC7606"/>.
			</t>

			<t>
				       Note target="RFC7606" format="default"/>.</t>
        <t>Note that an EVI-RT EC is not a Route Target Extended Community, extended community,
	is not visible to the RT Constrain mechanism <xref target="RFC4684"/>, target="RFC4684" format="default"/>,
	and is not intended to influence the propagation of routes by BGP.
			</t>

<figure  > BGP.</t>
        <artwork ><![CDATA[ name="" type="" align="center" alt=""><![CDATA[
                     1                   2                   3
 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type=0x06     |  Sub-Type=n   |       RT associated with EVI  |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|             RT associated with the EVI  (cont.)               |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    ]]></artwork>
</figure>

          <t>
	                 Where the

        <t>The value of 'n' "n" is 0x0A, 0x0B, 0x0C, or 0x0D 0x0D, corresponding
	to EVI-RT type types 0, 1, 2, or 3 respectively.
	      </t> 3, respectively.</t>
      </section>
      <section title="Rewriting numbered="true" toc="default">
        <name>Rewriting of RT ECs and EVI-RT ECs by ASBRs">
			 <t> ASBRs</name>
<!-- Note: text updated per mail from John E Drake <jdrake@juniper.net>
on 5/18/2022. -->

<!-- [rfced] AD, Section 9.6 was updated per a request from the author.  Please review and let us know if the changes are approved.  Note that you can also view the changes in the diff files.

Original:
   There are certain situations in which an ES is attached to a set of
   PEs that are not all in the same AS, or not all operated by the same
   provider.  In some such situations, the RT that corresponds to a
   particular EVI may be different in each AS.  If a route is propagated
   from AS1 to AS2, an ASBR at the AS1/AS2 border may be provisioned
   with a policy that removes the RTs that are meaningful in AS1 and
   replaces them with the corresponding (i.e., RTs corresponding to the
   same EVIs) RTs that are meaningful in AS2.  This is known as RT-rewriting.
			</t>

			<t> RT-
   rewriting.

   Note that if a given route's RTs are rewritten, and the route carries
   an EVI-RT EC, the EVI-RT EC needs to be rewritten as well.
			</t>

Current:
   There are certain situations in which an ES is attached to a set of
   PEs that are not all in the same AS, or not all operated by the same
   provider.  In this situation, the RT that corresponds to a particular
   EVI may be different in each AS.  If a route is propagated from AS1
   to AS2, an ASBR at the AS1/AS2 border may be configured with a policy
   that replaces the EVI RTs for AS1 with the corresponding EVI RTs
   for AS2.  This is known as RT-rewriting.

   If an ASBR is configured to perform RT-rewriting of the EVI RTs in
   EVPN routes, it MUST be configured to perform RT-rewriting of the
   corresponding EVI-RT extended communities in IGMP Join Synch and IGMP
   Leave Synch Routes.
-->

        <t>There are certain situations in which an ES is attached to a set of PEs that are not all in the same AS, or not all operated by the same provider.  In this situation, the RT that corresponds to a particular EVI may be different in each AS.  If a route is propagated from AS1 to AS2, an ASBR at the AS1/AS2 border may be configured with a policy that replaces the EVI RTs for AS1 with the corresponding EVI RTs for AS2.  This is known
as RT-rewriting.</t>
        <t>If an ASBR is configured to perform RT-rewriting of the EVI RTs in EVPN routes, it <bcp14>MUST</bcp14> be configured to perform RT-rewriting of the corresponding  EVI-RT extended communities in IGMP Join Synch and IGMP Leave Synch Routes.</t>
      </section>
      <section title="BGP numbered="true" toc="default">
        <name>BGP Error Handling">
			 <t>
				 If Handling</name>
        <t>If a received BGP update contains Flags not in accordance with the IGMP/MLD
	version-X expectation,
	the PE MUST <bcp14>MUST</bcp14> apply the "treat-as-withdraw" procedure as per <xref target="RFC7606"/>
			 </t>
			 <t>
				 If
	target="RFC7606" format="default"/>.</t>
        <t>If a received BGP update is malformed such that BGP route keys cannot be extracted,
	then the BGP update MUST <bcp14>MUST</bcp14> be considered as invalid. Receiving The receiving PE MUST
	<bcp14>MUST</bcp14> apply the "Session "session reset" procedure of per <xref target="RFC7606"/>.
			</t> target="RFC7606"
	format="default"/>.</t>
      </section>
    </section>
    <section title="IGMP numbered="true" toc="default">
      <name>IGMP Version 1 Membership Report">
		 <t>
			 This Report</name>
      <t>This document does not provide any detail about IGMPv1 processing.
      Implementations are expected to only use IGMPv2 and above for IPv4 and
      MLDv1 and above for IPv6. IGMPv1 routes are considered invalid invalid, and the
      PE MUST <bcp14>MUST</bcp14> apply the "treat-as-withdraw" procedure as per
      <xref target="RFC7606"/>.

		</t> target="RFC7606" format="default"/>.</t>
    </section>
    <section title="Security Considerations">
         <t>
	       This numbered="true" toc="default">
      <name>Security Considerations</name>
      <t>This document describes a means to efficiently operate IGMP and MLD on a subnet
      constructed across multiple PODs or DCs via an EVPN solution.  The security
      considerations for the operation of the underlying EVPN and BGP substrate substrates are
      described in <xref target="RFC7432"/>, target="RFC7432" format="default"/>, and specific multicast
      considerations are outlined in
      <xref target="RFC6513"/> target="RFC6513" format="default"/> and <xref target="RFC6514"/>. target="RFC6514" format="default"/>.
      The EVPN and associated IGMP proxy Proxy provides a single
      broadcast domain so the same security considerations of IGMPv2 <xref target="RFC2236"/>, target="RFC2236"
      format="default"/>, IGMPv3
      <xref target="RFC3376"/>, target="RFC3376" format="default"/>, MLD <xref target="RFC2710"/>, target="RFC2710" format="default"/>,
      or MLDv2 <xref target="RFC3810"/> apply.

         </t> target="RFC3810" format="default"/> apply.</t>
    </section>

    <section title="IANA Considerations">

       <section title="EVPN numbered="true" toc="default">
      <name>IANA Considerations</name>
      <section numbered="true" toc="default">
        <name>EVPN Extended Community Sub-Types Registrations">
	                <t>
           IANA Registration</name>
        <t>IANA has allocated the following codepoints from in the EVPN "EVPN Extended Community Sub-Types
           sub-registry of Sub-Types"
        subregistry under the BGP "Border Gateway Protocol (BGP) Extended Communities Communities" registry. </t>

         <figure>
<artwork ><![CDATA[

           0x09    Multicast Flags

        <table>
         <name>EVPN Extended Community   [this document]
           0x0A    EVI-RT Sub-Types Subregistry Allocated Codepoints</name>
	  <thead>
	    <tr>
	      <th>Sub-Type Value</th>
	      <th>Name</th>
	      <th>Reference</th>
	    </tr>
	  </thead>
	  <tbody>
	    <tr>
	      <td>0x09</td>
	      <td>Multicast Flags Extended Community</td>
	      <td>RFC 9251</td>
	    </tr>
	    <tr>
	      <td>0x0A</td>
	      <td>EVI-RT Type 0                        [this document]
           0x0B    EVI-RT 0</td>
	      <td>RFC 9251</td>
	    </tr>
	    <tr>
	      <td>0x0B</td>
	      <td>EVI-RT Type 1                        [this document]
           0x0C    EVI-RT 1</td>
	      <td>RFC 9251</td>
	    </tr>
	    <tr>
	      <td>0x0C</td>
	      <td>EVI-RT Type 2                        [this document]

				 ]]></artwork>
</figure>

        <t>
	               IANA is requested to allocate a new codepoint from the EVPN
	               Extended Community sub-types registry for the following.
	    </t>

<figure>
<artwork ><![CDATA[
	 0x0D    EVI-RT 2</td>
	      <td>RFC 9251</td>
	    </tr>
	     <tr>
	      <td>0x0D</td>
	      <td>EVI-RT Type 3                        [this document]

				 ]]></artwork>
</figure> 3</td>
	      <td>RFC 9251</td>
	    </tr>
	  </tbody>
	</table>
      </section>
      <section title="EVPN numbered="true" toc="default">
        <name>EVPN Route Type Registration">

<t>
	       IANA Types Registration</name>
        <t>IANA has allocated the following EVPN route types from in the EVPN "EVPN
	Route Type registry.
</t>

<figure>
<artwork ><![CDATA[
	        6 - Selective Types" subregistry.</t>

	<dl newline="false" spacing="normal">
	  <dt>6 -</dt>
	  <dd>Selective Multicast Ethernet Tag Route
                7 - Multicast Route</dd>
	  <dt>7 -</dt>
	  <dd>Multicast Membership Report Synch Route
                8 - Route</dd>
	  <dt>8 -</dt>
	  <dd> Multicast Leave Synch Route

				 ]]></artwork>
</figure> Route</dd>
	</dl>

      </section>
      <section title="Multicast anchor="multicast_flags_extended_community" numbered="true" toc="default">
        <name>Multicast Flags Extended Community Registry">

       <t>
	              The Multicast Registry</name>
        <t>IANA has created and now maintains a new subregistry called "Multicast Flags Extended Community contains a Community" under the "Border Gateway Protocol (BGP) Extended Communities" registry. The registration procedure is First Come First Served <xref target="RFC8126"/>. For the 16-bit Flags
	              field. The field, the bits are numbered 0-15, from high-order high order to low-order.
       </t>

<figure>
<artwork ><![CDATA[ low order. The registry should be was initialized as follows:

       Bit         Name                             Reference            Change Controller
       ----        --------------                   -------------        ------------------
       0 - 13       Unassigned
       14           MLD follows:</t>

        <table>
  	 <name>Multicast Flags Extended Community</name>
	  <thead>
	    <tr>
	      <th>Bit</th>
	      <th>Name</th>
	      <th>Reference</th>
	      <th>Change Controller</th>
	    </tr>
	  </thead>

	  <tbody>
	    <tr>
	      <td>0-13</td>
	      <td>Unassigned</td>
	      <td></td>
	      <td></td>
	    </tr>

	    <tr>
	      <td> 14</td>
	      <td>MLD Proxy Support                This document.           IETF
       15           IGMP Support</td>
	      <td>RFC 9251</td>
	      <td>IETF</td>
	    </tr>

	    <tr>
	      <td> 15</td>
	      <td>IGMP Proxy Support               This document            IETF

       The registration policy should be "First Come First Served".

				 ]]></artwork>
</figure> Support</td>
	      <td>RFC 9251</td>
	      <td>IETF</td>
	    </tr>
	  </tbody>
	</table>
      </section>
    </section>
  </middle>
  <back>
    <displayreference target="I-D.ietf-bess-evpn-bum-procedure-updates" to="EVPN-BUM"/>
    <references>
      <name>References</name>
      <references>
        <name>Normative References</name>
        <xi:include href="https://xml2rfc.ietf.org/public/rfc/bibxml/reference.RFC.2119.xml"/>
        <xi:include href="https://xml2rfc.ietf.org/public/rfc/bibxml/reference.RFC.7432.xml"/>
        <xi:include href="https://xml2rfc.ietf.org/public/rfc/bibxml/reference.RFC.3376.xml"/>
        <xi:include href="https://xml2rfc.ietf.org/public/rfc/bibxml/reference.RFC.2710.xml"/>
        <xi:include href="https://xml2rfc.ietf.org/public/rfc/bibxml/reference.RFC.3810.xml"/>
        <xi:include href="https://xml2rfc.ietf.org/public/rfc/bibxml/reference.RFC.7606.xml"/>
        <xi:include href="https://xml2rfc.ietf.org/public/rfc/bibxml/reference.RFC.4684.xml"/>
        <xi:include href="https://xml2rfc.ietf.org/public/rfc/bibxml/reference.RFC.2236.xml"/>
        <xi:include href="https://xml2rfc.ietf.org/public/rfc/bibxml/reference.RFC.8174.xml"/>
        <xi:include href="https://xml2rfc.ietf.org/public/rfc/bibxml/reference.RFC.4364.xml"/>
        <xi:include href="https://xml2rfc.ietf.org/public/rfc/bibxml/reference.RFC.6625.xml"/>
        <xi:include href="https://xml2rfc.ietf.org/public/rfc/bibxml/reference.RFC.6513.xml"/>
        <xi:include href="https://xml2rfc.ietf.org/public/rfc/bibxml/reference.RFC.6514.xml"/>
      </references>
      <references>
        <name>Informative References</name>
        <xi:include href="https://xml2rfc.ietf.org/public/rfc/bibxml/reference.RFC.4541.xml"/>
	<xi:include href="https://xml2rfc.ietf.org/public/rfc/bibxml/reference.RFC.8126.xml"/>

	<!-- draft-ietf-bess-evpn-bum-procedure-updates-14: in MISSREF as of 5/26/22-->
        <xi:include href="https://datatracker.ietf.org/doc/bibxml3/reference.I-D.ietf-bess-evpn-bum-procedure-updates.xml"/>
      </references>
    </references>
        <section title="Acknowledgement">
	      <t>
		          The numbered="false" toc="default">
      <name>Acknowledgements</name>
      <t>The authors would like to thank Stephane Litkowski, Jorge Rabadan,
		          Anoop Ghanwani, Jeffrey Haas, Krishna <contact fullname="Stephane Litkowski"/>, <contact
      fullname="Jorge Rabadan"/>,
      <contact fullname="Anoop Ghanwani"/>, <contact fullname="Jeffrey Haas"/>, <contact
      fullname="Krishna Muddenahally Ananthamurthy, Swadesh Agrawal Ananthamurthy"/>, and <contact fullname="Swadesh Agrawal"/>
      for reviewing their reviews and providing valuable
		          comment.
		  </t> comments.</t>
    </section>
    <section title="Contributors">

	  <t>
		     Derek Yeung </t>
		   <t>  Arrcus </t>
		    <t> Email: derek@arrcus.com
	  </t> numbered="false" toc="default">
      <name>Contributors</name>

      <contact fullname="Derek Yeung">
	<organization>Arrcus</organization>
	<address>
	  <email>derek@arrcus.com</email>
	</address>
      </contact>

    </section>

  </middle>

  <!--  *****BACK MATTER ***** -->

  <back>
            <references title='Normative References'>
	             <?rfc include='reference.RFC.2119' ?>
	             <?rfc include='reference.RFC.7432' ?>
	             <?rfc include='reference.RFC.3376' ?>
	             <?rfc include='reference.RFC.2710' ?>
                 <?rfc include='reference.RFC.3810' ?>
                 <?rfc include='reference.RFC.7606' ?>
                 <?rfc include='reference.RFC.4684' ?>
                 <?rfc include='reference.RFC.2236' ?>
                 <?rfc include='reference.RFC.8174' ?>
                 <?rfc include='reference.RFC.4364' ?>
                 <?rfc include='reference.RFC.6625' ?>
                 <?rfc include='reference.RFC.6513' ?>
                 <?rfc include='reference.RFC.6514' ?>

  </references>
  <references title="Informative References">
 <?rfc include='reference.RFC.4541' ?>
 <?rfc include="reference.I-D.ietf-bess-evpn-bum-procedure-updates"?>
      </references>
  </back>
</rfc>