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<?rfc toc="yes"?>
<?rfc tocompact="yes"?>
<?rfc tocdepth="3"?>
<?rfc tocindent="yes"?>
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<rfc category="std" xmlns:xi="http://www.w3.org/2001/XInclude" docName="draft-ietf-mpls-lsp-ping-registries-update-11" number="9041" ipr="trust200902" updates="8029, 8611"> 8611" obsoletes="" submissionType="IETF" category="std" consensus="true" xml:lang="en" tocInclude="true" tocDepth="3" symRefs="true" sortRefs="true" version="3">

  <front>

    <title abbrev="LSP Ping Registries">Updating the IANA MPLS LSP Label Switched Paths (LSPs) Ping Parameters</title> Parameters IANA Registry</title>
    <seriesInfo name="RFC" value="9041"/>
    <author fullname="Loa Andersson" initials="L." surname="Andersson">
      <organization>Bronze Dragon Consulting</organization>
      <address>
        <postal>
          <street/>
          <city/>
          <region/>
          <code/>
          <country/>
        </postal>
        <email>loa@pi.nu</email>
      </address>
    </author>
    <author fullname="Mach fullname="Mach(Guoyi) Chen" initials="M." surname="Chen">
      <organization>Huawei Technologies</organization>
      <address>
        <postal>
          <street/>
          <city/>
          <region/>
          <code/>
          <country/>
        </postal>
        <email>mach.chen@huawei.com</email>
      </address>
    </author>
    <author fullname="Carlos Pignataro" initials="C." surname="Pignataro">
      <organization>Cisco Systems</organization>
      <address>
        <postal>
          <street/>
          <city/>
          <region/>
          <code/>
          <country/>
        </postal>
        <email>cpignata@cisco.com</email>
      </address>
    </author>
    <author fullname="Tarek Saad" initials="T." surname="Saad">
      <organization>Juniper Networks</organization>
      <address>
        <postal>
          <street/>
          <city/>
          <region/>
          <code/>
          <country/>
        </postal>
        <email>tsaad@juniper.net</email>
      </address>
    </author>
    <date year="2021" month="July" />
    <workgroup>MPLS Working Group</workgroup>

    <abstract>

      <t>
   This document updates RFC RFCs 8029 and RFC 8611 which 8611, both of which define IANA
   registries for MPLS Label Switched Path (LSP) Ping, in particular Ping. In particular, the
   registration procedure "Private Use" (esarlier know (previously known as "Vendor Private Use")
   is
   has been changed to "First Come, Come First Served" for the TLV and Sub-TLV Registries. sub-TLV registries.
      </t>
      <t>
   It also updates the description of the procedures for the responses sent
   when an unknown or erroneous code point is found.
   The updates are to clarify and align this namespace with recent developments,
   e.g.
   e.g., aligning terminology with RFC 8126 instead of the updates to " Guidelines now obsoleted RFC 5226 (both titled "Guidelines for Writing an IANA Considerations Section in RFCs" (e.g. RFC 8126), instead of the terminology from the
   obsoleted RFC 5226. RFCs").
      </t>
    </abstract>
  </front>
  <middle>
  <!-- section 1 -->
    <section anchor="intro" title="Introduction"> numbered="true" toc="default">
      <name>Introduction</name>
      <t>
    There were a number of reasons to start the work that has led to this
    document, e.g.:
    <list style="symbols">
    <t> e.g.,
      </t>
      <ul spacing="normal">
        <li>
    When the LSP Ping registry was created created, it was incorrectly assumed that code
    points allocated by Experimental RFCs would be 'experimental' "experimental" code points;
    a code point
    made available in a public IANA registry is not limited by the type of RFC
    that made the allocation but allocation: it is available for use in any type of document.
    </t>

    <t>

    </li>
        <li>
    The number of 'experimental' "experimental" code points was also too large, large as compared to
    what is normally
    allocated for "Experimental Use".
    </t>

    <t>
    RFC 8029 uses the
    </li>
        <li>
    The words "mandatory" and "optional" are used differently to how in <xref target="RFC8029"/> than in other
    RFC do. RFC 8029 for example
    RFCs. For example, <xref target="RFC8029"/> talks about mandatory TLVs to
    indicate that it is
    mandatory to take a certain action if the TLV is found in a message but is not recognized, other recognized. Other RFCs uses use "mandatory TLV" to indicate a TLV that
    must be present in a message.
    </t>

    </list>
    </li>
      </ul>
      <t>

    Over time time, there have been attempts to administratively update some of the
    registries, but it was soon decided that an RFC was needed. Other, often
    minor, potential updates were found, e.g. e.g., reserving the
    value 0 (zero) in registries where that is possible.
      </t>
      <t>
    When RFC 8029
    <xref target="RFC8029"/> was published it contained target="RFC8029" format="default"/> contains
    updates to the "Multiprotocol Label Switching (MPLS) Label
    Switched Paths (LSPs)
    Ping Parameters" "<xref target="IANA-LSP-PING" format="title"/>" IANA namespace <xref target="IANA-LSP-PING"/>. target="IANA-LSP-PING" format="default"/>.
      </t>
      <t>
     RFC 8611
     <xref target="RFC8611"/> target="RFC8611" format="default"/> created LSP Ping IANA registries that
     match RFC 8126. <xref target="RFC8126"/>.  This document further clarifies the entries in those
     registries and makes the definitions more precise.
      </t>
      <t>
    This document updates RFC 8029  <xref target="RFC8029"/> target="RFC8029" format="default"/> and RFC 8611
    <xref target="RFC8611"/> target="RFC8611" format="default"/> by updating two groups of registries as follows:
      </t>
      <t>
    First
    First, the registries for Message Types "Message Types" <xref target="IANA-MT"/>,
    Reply Modes target="IANA-MT" format="default"/>,
    "Reply Modes" <xref target="IANA-RM"/> target="IANA-RM" format="default"/>, and Return Codes "Return Codes" <xref target="IANA-RC"/> target="IANA-RC" format="default"/> registries
    are updated.
    The changes to these registries are minor.
      </t>
      <t>
    Second, this document updates the TLV and sub-TLV registries.
    <list style="symbols">

    <t>
    <xref target="IANA-TLV-reg" format="title"/> <xref target="IANA-TLV-reg"/>. registries listed below:
      </t>

    <t>
    Sub-TLVs for TLVs 1, 16 and 21
      <ul spacing="normal">
        <li>
          "<xref target="IANA-TLV-reg" format="title"/>", <xref target="IANA-Sub-1-16-21"/>.
    </t>

    <t> target="IANA-TLV-reg" format="default"/>
    </li>
        <li>
    "<xref target="IANA-Sub-1-16-21" format="title"/>", <xref target="IANA-Sub-1-16-21" format="default"/>
    </li>
        <li>
          "<xref target="IANA-Sub-6" format="title" /> format="title"/>", <xref target="IANA-Sub-6"/>.
    </t>

    <t>
    Sub-TLVs for TLV 11 target="IANA-Sub-6" format="default"/>
    </li>
        <li>
 "<xref target="IANA-Sub-11" format="title"/>", <xref target="IANA-Sub-11"/>.
    </t>

    <t>
    Sub-TLVs for TLV 20 target="IANA-Sub-11" format="default"/>
    </li>
        <li>
    "<xref target="IANA-Sub-20" format="title"/>", <xref target="IANA-Sub-20"/>.
    </t>

    <t>
    Sub-TLVs for TLV 23 target="IANA-Sub-20" format="default"/>
    </li>
        <li>
   "<xref target="IANA-Sub-23" format="title"/>", <xref target="IANA-Sub-23"/>.
    </t>

    <t>
    Sub-TLVs for TLV 27 target="IANA-Sub-23" format="default"/>
    </li>
        <li>
    "<xref target="IANA-Sub-27" format="title"/>", <xref target="IANA-Sub-27"/>.
    </t>
    </list>
    </t> target="IANA-Sub-27" format="default"/>
    </li>
      </ul>
      <t>
   It should be noted that RFC 8029 <xref target="RFC8029"/> was published before RFC 8126 <xref target="RFC8126"/> and
   uses old outdated terminology for some registration procedures, e.g.,
   "Vendor Private Use".  RFC 8611  <xref target="RFC8611"/> was published after RFC 8126 <xref target="RFC8126"/> and uses
   newer
   its recommended terminology, e.g., "Private Use".  Both  However, now both "Vendor Private Use"
   and "Private Use" has have been removed and replaced with
   "First come, first served Come First Served" (FCFS) code points.
      </t>
      <t>

   One reason to change from code point points allocated by Vendor Private Use
   or Private Use is that such code points are allowed in production
   networks.  Theoretically, it is possible that two vendors might use the
   same code point value with different meanings.  If such a code is ever
   deployed in the same network network, this could cause protocol issues that
   would be hard to debug.
      </t>

      <t>
   With FCFS code points points, this will not happen.  Vendors that have existing
   code using Vendor Private Use or Private Use code points should
   register those code points as FSFC FCFS code points as soon as this document is
   published as an RFC.
      </t>
      <t>
    The registry for sub-TLVs for TLV 9 <xref target="IANA-Sub-9"/> "<xref target="IANA-Sub-9" format="title"/>" subregistry is not updated.
      </t>
      <t>
     Third, according to RFC 8029 <xref target="RFC8029"/>, some code points (TLVs and sub-TLVs)
     are called "mandatory" or
     "optional".  Contrary to how other RFCs use these words, indicating
     that it is mandatory or optional to include the code points in a
     message, RFC 8029 <xref target="RFC8029"/> uses these words to indicate that an action might or
     might not be mandatory.  This document updates RFC 8029 <xref target="RFC8029"/> to drop the words
     "mandatory" and "optional", and the text is changed to focus on what
     should be done.
      </t>
      <section anchor="lang" title="Requirement Language"> numbered="true" toc="default">
        <name>Requirements Language</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 BCP&nbsp;14 <xref target="RFC2119"/> <xref target="RFC8174"/>
    when, and only when, they appear in all capitals, as shown here.
        </t>
      </section>
      <section anchor="terms" title="Terminology"> numbered="true" toc="default">
        <name>Terminology</name>
        <t>
    This section list lists terms that are used when discussing the hierarchy of
    IANA registers registries (<xref target="local-terms"/>) target="local-terms" format="default"/>),
    and abbreviations used in IANA registries update are updated in this document (<xref target="abbr"/>). target="abbr" format="default"/>).
        </t>
        <section anchor="local-terms" title="Terminology numbered="true" toc="default">
          <name>Terminology Used in this Document">

    <t> This document uses some terms that relates Document</name>

          <t>
    Terms related to IANA registries are used as follows in this way:
    <list style="symbol">

    <t>
    IANA Name Space, <vspace blankLines="0"/> a document:
          </t>
<dl newline="true">
              <dt>
    Namespace</dt>
              <dd> A namespace is a top level top-level registry.
    An example could be
    "<xref target="lsp-ping-Namespace" format="title"/>" <xref target="IANA-LSP-PING"/>. target="IANA-LSP-PING" format="default"/>.
    A namespace is most often a container for registries that hold code points
    that share some affinity.
    </t>

    <t>
    IANA Registry, <vspace blankLines="0"/> an
              </dd>
              <dt>
    Registry</dt>

              <dd>An IANA registry holds code points, points
    and lists the registration
    procedures and allocation for these code points. One example
    would be the
    "<xref target="IANA-TLV-reg" format="title"/>" registry
    <xref target="IANA-TLV-reg"/>.
    </t>

    <t>
    IANA Sub-registry, <vspace blankLines="0"/> a sub-registry target="IANA-TLV-reg" format="default"/>.
              </dd>
              <dt>

    Subregistry</dt>
              <dd>A subregistry is used when a
    code point, or a set of code points allocated in a single registry, needs
    "sub-code points"
    "sub-code-points" scoped by the code point or the set of code points. An
    example of a sub-registry subregistry that holds code points for more than one TLV is
    "<xref target="IANA-Sub-1-16-21" format="title"/>" <xref target="IANA-Sub-1-16-21"/>
    </t>

    </list>

    </t> target="IANA-Sub-1-16-21" format="default"/>.
              </dd>

          </dl>
        </section>
        <section title="Abbreviations" anchor="abbr"> anchor="abbr" numbered="true" toc="default">
          <name>Abbreviations</name>
          <t>
    This section list lists abbreviations used in the unchanged part of the registries
    updated by this document. These abbreviations were originally expanded in
    the document defining the registries. They are listed here following the
    requirement to expand any abbreviation that is not well-known. well known. All these
    abbreviations are from the <xref "<xref target="IANA-RC" format="title"/> format="title"/>"
    registry <xref target="IANA-RC"/>. target="IANA-RC" format="default"/>.
          </t>

    <t>
    <list style="symbol">

    <t>
    BFD - Bidirectional
   <dl indent="10">
    <dt>BFD:</dt><dd>Bidirectional Forwarding Detection
    </t>

    <t>
    DDMAP - Downstream
    </dd>
            <dt>
    DDMAP:</dt><dd>Downstream Detailed Mapping
    </t>

    <t>
    FEC - Forwarding
    </dd>
            <dt>
    FEC:</dt><dd>Forwarding Equivalence Class
    </t>

    <t>
    OAM - Operation, Administration
    </dd>
            <dt>
    OAM:</dt><dd>Operation, Administration, and Maintenance
    </t>

    <t>
    PM - Performance
    </dd>
            <dt>
    PM:</dt><dd>Performance Monitoring
    </t>

    <t>
    RSC - Return
    </dd>
            <dt>
    RSC:</dt><dd>Return Subcode
    </t>
    </list>
    </t>
  </dd>

   </dl>
        </section>
      </section>
    </section>
    <section anchor="codes" title="Updating numbered="true" toc="default">
      <name>Updating the Message Types, Reply Mode Modes, and Return Codes Registries"> Registries</name>
      <t>
The following changes are have been made to the Message Types "<xref target="IANA-MT" format="title"/>" <xref target="IANA-MT"/>,
    Reply Modes target="IANA-MT" format="default"/>,
    "<xref target="IANA-RM" format="title"/>" <xref target="IANA-RM"/> target="IANA-RM" format="default"/>, and Return Codes "<xref target="IANA-RC" format="title"/>"
    <xref target="IANA-RC"/> target="IANA-RC" format="default"/> registries.

<list style="symbols">

<t>

</t>
      <ul spacing="normal">
        <li>
   In the listing of assigned code points points, the term "Vendor Private Use" is changed to
   "Private Use".
</t>

<t> Use" for the 252-255 range.  The registration procedures have been updated to reflect this.
</li>
        <li>
   The registration procedure "Specification Required" is changed to "RFC
   Required" and the note "Experimental RFC needed" is removed.
</t>

<t> removed for the 192-247 range.
</li>
        <li>
   A small set of four code points (4 code points) (248-251) for Experimental Use is
   added by reducing the "RFC Required" range.
</t>

<t>   The registration procedures "Private Use" and "Experimental Use" are added have been updated to
the table of registration procedures.
</t>

<t> reflect this.
</li>

        <li>
A note "Not "Reserved, not to be assigned" is has been added for the registration procedures of the
"Private Use" and "Experimental Use".
</t> Use" ranges.
</li>
        <li>
          <t>
In the lists that capture the assignment status, the fields that are reserved, i.e.,
0 (zero), Private Use Use, and Experimental Use Use, are clearly marked as such.
<list style="symbols">
<t>
</t>
          <ul spacing="normal">
            <li>
   Note that in the Return Codes "<xref target="IANA-RC" format="title"/>" registry
   <xref target="IANA-RC"/> target="IANA-RC" format="default"/>, the code point "0"
   has already been assigned.  This assignment is not changed changed, and in this
   registry
   registry, the code point "0" continues to be assigned as "No Return Code".

</t>
</list>
</t>
<!-- Amandas comment left in for easy changeability
<t>
At the top of each registry listed in this section a reference to this document
should be added making the header of the register look like this:
<list style="empty">
<t>
[Registry Name]
<vspace blankLines="0"/>
Expert(s)
<vspace blankLines="0"/>
Mach Chen and Carlos Pignataro
<vspace blankLines="0"/>
Reference
<vspace blankLines="0"/>
[RFC8029] [This document]
<vspace blankLines="0"/>
Available Formats
<vspace blankLines="0"/>
CSV
</t>
</list>
</t>

-->
</list>

</t>

</li>
          </ul>
        </li>
</ul>
      <t>
The new Registration Procedures, registration procedures, the registry layouts layouts, and the new assignments
for these
registries are found in <xref target="app-messages"/>. target="app-messages" format="default"/>.
</t>
    </section>
    <section anchor="upd-tlv" title="Updating numbered="true" toc="default">
      <name>Updating the TLV and Sub-TLV Registries"> Registries</name>
      <section anchor="principles" title="General numbered="true" toc="default">
        <name>General Principles for the LSP Ping TLV and Sub-TLV registries"> Registries</name>
        <t>
The following principles apply to the processing of any TLV from any
of the LSP Ping TLVs TLV and sub-TLVs sub-TLV IANA registries.
<list style="symbols">
<t>
</t>
        <ul spacing="normal">
          <li>
All TLVs and sub-TLVs with a type in the range 0-32767 require a response
if they are not recognized.
</t>

<t>
</li>
          <li>
All TLVs and sub-TLVs in the range 32768-65535 may can be silently dropped, stepped
over or an error message sent dropped if they are not recognized.
</t>

<!-- Amandas comment left in becasue easy changeability
<t>
At Alternatively, the top of each registry listed in this section a reference to this document
should be added making the header of receiver may step over the register look like this:
<list style="empty">

<t>
[Registry Name]
<vspace blankLines="0"/>
Expert(s)
<vspace blankLines="0"/>
Mach Chen and Carlos Pignataro
<vspace blankLines="0"/>
Reference
<vspace blankLines="0"/>
[Current Reference(s)] [This document]
<vspace blankLines="0"/>
Available Formats
<vspace blankLines="0"/>
CSV
</t>
</list>
</t>

-->

</list>

</t> unrecognized TLV or send an error message.
</li>
</ul>
        <t>
Each of the blocks has code point spaces with the following registration
procedures:
<list style="symbols">
<t>
Standards Action.
</t>

<t>
RFC Required.
</t>

<t>
        <ul spacing="normal">
          <li>
Standards Action
</li>
          <li>
RFC Required
</li>
          <li>
Experimental Use.
</t>

<t> Use
</li>
          <li>
First Come First Served (FCFS).
</t>

</list>
</t> (FCFS)
</li>
        </ul>
        <t>
The exact definitions of these procedures are found
in <xref target="RFC8126"/>. target="RFC8126" format="default"/>.
</t>
        <section anchor="unrecog" title="Unrecognized numbered="true" toc="default">
          <name>Unrecognized Experimental Use TLVs and Sub-TLVs"> Sub-TLVs</name>
          <t>
Unrecognized TLVs and sub-TLVs in the Experimental Use, Use and FCFS ranges are
handled as any other unrecognized TLV or sub-TLV.

<list style="symbols">
<t>

</t>
          <ul spacing="normal">
            <li>
If the unrecognized TLV or sub-TLV is from the Experimental Use range
(31740-31743)
or from the FCFS range (31744-32767) (31744-32767), a Return Code of 2
("One or more of the TLVs was not understood") must be sent in the echo response.
</t>
<t>
</li>
            <li>
If the unrecognized a TLV or sub-TLV is from the Experimental Use range
(64508-64511) or from the FCFS range (64512-65535) is unrecognized, then the TLVs may be receiver can silently
ignored, stepped drop the TLV. Alternatively, the receiver may step over the unrecognized TLV or send an error message sent.
</t>

</list>

</t> message.
</li>
          </ul>
          <t>
   The IETF does not prescribe how recognized or unrecognized Experimental Use
   and Private Use TLVs and sub-TLVs are
   handled in experimental or private networks; that is up to the agency running
   the experimental or the private network. The statement above describes how
   standards
   compliant
   standards-compliant implementations must treat the unrecognized TLVs and sub-TLVs
   from these ranges.

</t>
        </section>
      </section>
      <section anchor="shared" title="Common numbered="true" toc="default">
        <name>Common Registration Procedures for TLVs and sub-TLVs"> Sub-TLVs</name>
        <t>
  This section describes the new registration procedures for the TLV and sub-TLV
  registries.
        </t>

   <texttable title="TLV
        <table anchor="tlv-sub-tlv" align="center">
          <name>TLV and sub-TLV Sub-TLV Registration Procedures" anchor="tlv-sub-tlv">
    <ttcol align='left' width="8%">Range</ttcol>
    <ttcol align='left' width="33%">Registration Procedures</ttcol>
    <ttcol align='left' width="69%">Note</ttcol>

    <c>0-16383</c>
    <c>Standards Action</c>
    <c>This Procedures</name>
          <thead>
            <tr>
              <th align="left">Range</th>
              <th align="left">Registration Procedures</th>
              <th align="left">Note</th>
            </tr>
          </thead>
          <tbody>
            <tr>
              <td align="left">0-16383</td>
              <td align="left">Standards Action</td>
              <td align="left">This range is for TLVs and sub-TLVs that require an error message if not recognized. [This This document, section 3.1]</c>

    <c>16384-31739</c>
    <c>RFC Required</c>
    <c>This <xref target="principles"/></td>
            </tr>
            <tr>
              <td align="left">16384-31739</td>
              <td align="left">RFC Required</td>
              <td align="left">This range is for TLVs and sub-TLVs that require an error message if not recognized. [This This document, section 3.1]</c>

    <c>31740-31743</c>
    <c>Experimental Use</c>
    <c>Reserved, not <xref target="principles"/></td>
            </tr>
            <tr>
              <td align="left">31740-31743</td>
              <td align="left">Reserved for Experimental Use</td>
              <td align="left">Not to be assigned. This range is for TLVs and sub-TLVs that require an error message if not recognized. [This This document, section 3.1]</c>

    <c>31744-32767</c>
    <c>FCFS</c>
    <c>This <xref target="principles"/></td>
            </tr>
            <tr>
              <td align="left">31744-32767</td>
              <td align="left">FCFS</td>
              <td align="left">This range is for TLVs and sub-TLVs that require an error message if not recognized. [This This document, section 3.1]</c>

    <c>32768-49161</c>
    <c>Standards Action</c>
    <c>This <xref target="principles"/></td>
            </tr>
            <tr>
              <td align="left">32768-49161</td>
              <td align="left">Standards Action</td>
              <td align="left">This range is for TLVs and sub-TLVs that can be silently dropped if not recognized.</c>

    <c>49162-64507</c>
    <c>RFC Required</c>
    <c>This recognized.</td>
            </tr>
            <tr>
              <td align="left">49162-64507</td>
              <td align="left">RFC Required</td>
              <td align="left">This range is for TLVs and sub-TLVs that can be silently dropped if not recognized.</c>

    <c>64508-64511</c>
    <c>Experimental Use</c>
    <c>Reserved, not recognized.</td>
            </tr>
            <tr>
              <td align="left">64508-64511</td>
              <td align="left">Reserved for Experimental Use</td>
              <td align="left">Not to be assigned. This range is for TLVs and sub-TLVs that can be silently dropped if not recognized.</c>

    <c>64512-65535</c>
    <c>FCFS</c>
    <c>This recognized.</td>
            </tr>
            <tr>
              <td align="left">64512-65535</td>
              <td align="left">FCFS</td>
              <td align="left">This range is for TLVs and sub-TLVs that can be silently dropped if not recognized.</c>

    </texttable> recognized.</td>
            </tr>
          </tbody>
        </table>
      </section>
      <section anchor="general" title="Changes numbered="true" toc="default">
        <name>Changes to the LSP Ping Registries"> Registries</name>
        <t>
This section lists the changes to each MPLS LSP Ping TLV and sub-TLV Registry.
Section registry.
Sections
<xref target="upds-tlv" format="counter"/> to <xref target="upds-sub-tlv-27" format="counter"/>
 describe how the new
versions of the IANA registries should look, together with the
registration procedures for each registry.
</t>
        <t>
The new Registration Procedures description registration procedure descriptions and the new assignments for these
registries are used to model the changed MPLS LSP Ping registries, registries; see
<xref target="IANA"/>. target="IANA" format="default"/>.
</t>
        <section anchor="common-tlv" title="Common Changes numbered="true" toc="default">
          <name>Changes Common to the TLV and Sub-TLV Registries"> Registries</name>
          <t>
The following changes are made to the TLV and sub-TLV registries.

<list style="symbols">
<t>

</t>
          <ul spacing="normal">
            <li>
The registration procedures "First Come First Served (FCFS)" Served" (FCFS) and
"Experimental Use" are have been added to
the table of registration procedures.
</t>

<t>
</li>
            <li>
Two small sets of code points (4 (four code points each) for Experimental Use, are Use have been
created. The first set is for the range that requires a response if the TLV or
sub-TLV is not recognized; the second set is for the range where the TLV or
sub-TLV that may be silently dropped if not recognized. The code points for
experimental use are
Experimental Use have been taken from the ranges previously (RFC 8029) called
'Specification Required'
"Specification Required" and (RFC 8611) "RFC Required".
</t>

<t> Required" <xref target="RFC8029"/>.
</li>
            <li>
The registration procedure "Specification Required" is has been changed to "RFC
Required"
Required", and the note "Experimental RFC needed" is has been removed.
</t>

<t>
</li>
            <li>
In the listing of assignments assignments, the term "Vendor Private Use" is has been changed to
"First Come First Served (FCFS)".
</t>

<t> Served" (FCFS).
</li>
            <li>
In the listing of assignments assignments, the range for "Experimental Use" is has been added.
</t>

<t>
</li>

            <li>
A note saying "Not to be assigned" is has been added for the registration procedures procedure
"Experimental Use".
</t>

<t>
</li>
            <li>
In the list that captures assignment status, the fields that are reserved, i.e.,
0 (zero) and Experimental Use are Use, have been clearly marked.
</t>

</list>

</t>
</li>
          </ul>
        </section>
      </section>
    </section>
    <section anchor="text-updates" title="Updates numbered="true" toc="default">
      <name>Updates to Related RFCs"> RFCs</name>
      <t>
     Some referenced RFCs use the concept "mandatory TLVs" and "mandatory
     sub-TLVs" to indicate that, if a TLV or sub-TLV of the range 0-32767
     in a message is not understood, an error message needs to be sent in
     response.
      </t>
      <t>
   The same RFCs use "optional TLVs" and "optional sub-TLVs" to mean TLVs or
   sub-TLVs that can be silently ignored if not recognized.
      </t>
      <t>
   Since other RFCs use "mandatory TLVs" and "mandatory sub-TLVs" to
   indicate TLVs and sub-TLVs that must be present in a message, we want to
   discontinue the use of "mandatory" to indicate TLVs and sub-TLVs that
   require
   an error message in response if not understood. The changes
   to the RFCs below align with this practice.
      </t>
      <section anchor="rfc8029" title="Updates numbered="true" toc="default">
        <name>Updates to RFC 8029"> 8029</name>

        <t>
    Mandatory
    "Mandatory" and optional "optional" are used to indicate whether a response is
    needed if a TLV or sub-TLV is not understood on pages 15 and 16 in Section 3 <xref target="RFC8029" sectionFormat="bare" section="3"/> of RFC 8029. "<xref target="RFC8029" format="title"/>" <xref target="RFC8611" format="default"/>.

        </t>
        <t>
   The text in those two paragraphs is now updated to the following:
        </t>

   <t>

   <list style="empty">
   <t>
<blockquote><t>
      TLV and sub-TLV Types types less than 32768 (i.e., with the high-order
      bit equal to 0) are TLVs and sub-TLVs that MUST <bcp14>MUST</bcp14> either be
      supported by an implementation or result in the a Return Code of 2
      ("One or more of the TLVs was not understood") being sent in the
      echo response. </t>
<t>
       An implementation that does not understand or support a received
       TLV or sub-TLV with Type a type greater than or equal to 32768 (i.e., with
       the high-order bit equal to 1) SHOULD <bcp14>SHOULD</bcp14> ignore and step over the TLV
       or sub-TLV, however sub-TLV; however, an implementation MAY <bcp14>MAY</bcp14> send an echo response
       with a Return Code of 2 ("One or more of the TLVs was not understood") as it
       would have done if the high order high-order bit had been clear.
    </t>

    </list>
    </t> clear.</t> </blockquote>

        <t>
    In Section 3.8 of RFC 8029 <xref target="RFC8029" section="3.8"/>, "mandatory" is used in the same way. The                             <!-- here --> first two paragraphs of this section are now updated to read as follows:
    <list style="empty">
    <t>
        </t>
<blockquote><t>
     The following TLV is a TLV that MAY <bcp14>MAY</bcp14> be included in an echo reply
     to inform the sender of an echo request that includes TLVs TLV or sub-
     TLVs sub-TLV Types less than 32768 (i.e., with the high-order bit equal to
     0) that are either not supported by the implementation or parsed and
     found to be in error.
    </t> error.</t>
<t>
    The Value field contains uses sub-TLVs to encode the TLVs, including sub-TLVs, received TLVs and sub-TLVs that were not
    understood, encoded as sub-TLVs.
    </t>
    </list>
    understood.
    </t>
        </blockquote>
      </section>
      <section anchor="rfc8611" title="Updates numbered="true" toc="default">
        <name>Updates to RFC 8611"> 8611</name>
        <t>
   Section 13.4.1 <xref target="RFC8611" sectionFormat="bare" section="13.4.1"/> of "<xref target="RFC8611" format="title"/> format="title"/>" <xref target="RFC8611"/>" target="RFC8611" format="default"/> defines "<xref target="IANA-Sub-6" format="title" />" format="title"/>" <xref target="IANA-Sub-6"/>. target="IANA-Sub-6" format="default"/>.
        </t>
        <t>
   The "Sub-TLVs for TLV Type 6" "<xref target="IANA-Sub-6" format="title"/>"
   registry is now has been updated to align with changes defined in this document.
        </t>
        <t>
   Section 13.4.1 of RFC 8611
   <xref target="RFC8611" section="13.4.1"/> is now updated as follows:
        </t>

   <t>
   Section
        <blockquote><t>Section 13.4.1 Sub-TLVs for TLV Type 6
   </t> 6</t></blockquote>
        <t>
   IANA has created a new sub-registry subregistry, "<xref target="IANA-Sub-6" format="title"/>" format="title"/>", <xref target="IANA-Sub-6"/> target="IANA-Sub-6" format="default"/>
   under the "<xref target="IANA-TLV-reg" format="title"/>" registry  <xref target="IANA-TLV-reg"/> target="IANA-TLV-reg" format="default"/>
   of the "<xref target="lsp-ping-Namespace" format="title"/>" namespace
   <xref target="lsp-ping-Namespace"/>. target="lsp-ping-Namespace" format="default"/>.
        </t>
        <t>
   The "<xref target="IANA-Sub-6" format="title"/>"
   sub-registry
   subregistry is now updated to align with changes defined in this document.
        </t>
    <texttable title="Sub-TLVs
        <table anchor="sub-six-texttab" align="center">
          <name>Sub-TLVs for TLV Type 6 Registration Procedures" anchor="sub-six-texttab">
    <ttcol align='left' width="8%">Range</ttcol>
    <ttcol align='left' width="33%">Registration Procedures</ttcol>
    <ttcol align='left' width="69%">Note</ttcol>
    <c>0-16383</c>
    <c>Standards Action</c>
    <c>This Procedures</name>
          <thead>
            <tr>
              <th align="left">Range</th>
              <th align="left">Registration Procedures</th>
              <th align="left">Note</th>
            </tr>
          </thead>
          <tbody>
            <tr>
              <td align="left">0-16383</td>
              <td align="left">Standards Action</td>
              <td align="left">This range is for sub-TLVs that require an error message if not recognized. [This This document, section 3.1]</c>

    <c>16384-31739</c>
    <c>RFC Required</c>
<c>This <xref target="principles"/></td>
            </tr>
            <tr>
              <td align="left">16384-31739</td>
              <td align="left">RFC Required</td>
              <td align="left">This range is for sub-TLVs that require an error message if not recognized. [This This document, section 3.1]</c>

    <c>31740-31743</c>
    <c>Experimental Use</c>
    <c>Reserved not <xref target="principles"/></td>
            </tr>
            <tr>
              <td align="left">31740-31743</td>
              <td align="left">Reserved for Experimental Use</td>
              <td align="left">Not to be assigned. This range is for sub-TLVs that require an error message if not recognized. [This This document, section 3.1]</c>

    <c>31744-32767</c>
    <c>FCFS</c>
    <c>This <xref target="principles"/></td>
            </tr>
            <tr>
              <td align="left">31744-32767</td>
              <td align="left">FCFS</td>
              <td align="left">This range is for sub-TLVs that require an error message if not recognized. [This This document, section 3.1]</c>
    <c>32768-49161</c>
    <c>Standards Action</c>
    <c>This <xref target="principles"/></td>
            </tr>
            <tr>
              <td align="left">32768-49161</td>
              <td align="left">Standards Action</td>
              <td align="left">This range is for sub-TLVs that can be silently dropped if not recognized.</c>

    <c>49162-64507</c>
    <c>RFC Required</c>
    <c>This recognized.</td>
            </tr>
            <tr>
              <td align="left">49162-64507</td>
              <td align="left">RFC Required</td>
              <td align="left">This range is for sub-TLVs that can be silently dropped if not recognized.</c>

    <c>64508-64511</c>
    <c>Experimental Use</c>
    <c>Reserved not recognized.</td>
            </tr>
            <tr>
              <td align="left">64508-64511</td>
              <td align="left">Reserved for Experimental Use</td>
              <td align="left">Not to be assigned. This range is for sub-TLVs that can be silently dropped if not recognized.</c>

    <c>64512-65535</c>
    <c>FCFS</c>
    <c>This recognized.</td>
            </tr>
            <tr>
              <td align="left">64512-65535</td>
              <td align="left">FCFS</td>
              <td align="left">This range is for sub-TLVs that can be silently dropped if not recognized.</c>
</texttable> recognized.</td>
            </tr>
          </tbody>
        </table>
      </section>
    </section>
    <section anchor="security" title="Security Considerations"> numbered="true" toc="default">
      <name>Security Considerations</name>
      <t>
    This document updates IANA registries. It also updates terminology
    used to define, and
    clarifies the terminology related to, the
    code points in the registries. The document does not change how the
    code-points
    code points in the
    registries are used. This should not create any new threats.
      </t>
      <t>
    However, the updated terminology and the clarifications
    improve security because it makes it more likely that implementations
    will be consistent and harder to attack.
      </t>
    </section>
    <section anchor="IANA" title="IANA Considerations"> numbered="true" toc="default">
      <name>IANA Considerations</name>
      <t>
     IANA is requested to update has updated the
     "<xref target="lsp-ping-Namespace" format="title"/>" namespace
     <xref target="IANA-LSP-PING"/> target="IANA-LSP-PING" format="default"/> as described in this
     document.
      </t>
      <t>
    See <xref target="local-terms" /> format="default"/> of "<xref target="local-terms" format="title"/>"
    to see
    how "namespace", "registry" "registry", and "sub-registry" "subregistry" are used in this document.
      </t>
      <t>
    In other parts of this document document, the communality commonality of the changes to the LSP
    Ping registries has been the focus. For the IANA considerations Considerations, each
    changed registry has been described in its own right.
      </t>
      <t>
    The following registries and sub-registries are changed:
    <vspace blankLines="1"/>
    "<xref subregistries have been changed:</t>
<ul empty="false">
<li>"<xref target="IANA-MT" format="title"/>", <xref target="IANA-MT"/>,
   <vspace blankLines="0"/>
    "<xref target="IANA-MT" format="default"/></li>
<li>"<xref target="IANA-RM" format="title"/>", <xref target="IANA-RM"/>
    <vspace blankLines="0"/>
    "<xref target="IANA-RM" format="default"/></li>
<li>"<xref target="IANA-RC" format="title"/>" format="title"/>", <xref target="IANA-RC"/>
    <vspace blankLines="0"/>
    "<xref target="IANA-RC" format="default"/></li>
<li>"<xref target="IANA-TLV-reg" format="title"/>" format="title"/>", <xref target="IANA-TLV-reg"/>
    <vspace blankLines="0"/>
    "<xref target="IANA-TLV-reg" format="default"/></li>
<li>"<xref target="IANA-Sub-1-16-21" format="title" />" format="title"/>", <xref target="IANA-Sub-1-16-21"/>
    <vspace blankLines="0"/>
    "<xref target="IANA-Sub-1-16-21" format="default"/></li>
<li>"<xref target="IANA-Sub-6" format="title" />" format="title"/>", <xref target="IANA-Sub-6"/>
    <vspace blankLines="0"/>
    "<xref target="IANA-Sub-6" format="default"/></li>
<li>"<xref target="IANA-Sub-11" format="title"/>" format="title"/>", <xref target="IANA-Sub-11"/>
    <vspace blankLines="0"/>
    "<xref target="IANA-Sub-11" format="default"/></li>
<li>"<xref target="IANA-Sub-20" format="title" />" format="title"/>", <xref target="IANA-Sub-20"/>
    <vspace blankLines="0"/>
    "<xref target="IANA-Sub-20" format="default"/></li>
<li>"<xref target="IANA-Sub-23" format="title"/>" format="title"/>", <xref target="IANA-Sub-23"/>
    <vspace blankLines="0"/>
    "<xref target="IANA-Sub-23" format="default"/></li>
<li>"<xref target="IANA-Sub-27" format="title"/>" format="title"/>", <xref target="IANA-Sub-27"/>
    </t> target="IANA-Sub-27" format="default"/></li>
    </ul>
      <t>
This document will be has been listed as an additional reference for each of the
registries described in Sections 6.1 <xref target="app-messages" format="counter"/> and 6.2. <xref target="upd-tls-sub-tlv" format="counter"/>.
</t>
      <section anchor="app-messages" title="Updates numbered="true" toc="default">
        <name>Updates by IANA to the Message Type, Types, Reply Mode Modes, and Return Codes Registries"> Registries</name>
        <t>
  This section details the updated registration procedures and allocations
  for "Message Type",   "Reply Mode" the "<xref target="IANA-MT" format="title"/>", "<xref target="IANA-RM" format="title"/>", and "Return Codes" "<xref target="IANA-RC" format="title"/>" registries.
        </t>
        <section anchor="mt-upd" title="Updates numbered="true" toc="default">
          <name>Updates to the Message Type registry"> Types Registry</name>
          <t>
  This is
  These are the changes to the "Message Type" "<xref target="IANA-MT" format="title"/>" registry specified in this document:
  <list style="symbols">
  <t>
          </t>
          <ul spacing="normal">
            <li>
  Code Point 0 (zero) is has been marked Reserved.
  </t>
  <t>
  </li>
            <li>
  The registration procedure "Specification Required" is has been changed to "RFC Required" Required",
  and the comment "Experimental RFC needed" is has been removed.
  </t>

  <t>
  </li>
            <li>
  Four code point points have been taken from what was earlier previously "Specification Required"
  to form a set of code points for "Experimental Use."
  </t>
  </list>
  </t> Use".
  </li>
          </ul>
          <t>
  The registration procedures after the changes listed above for the "Message Type" "<xref target="IANA-MT" format="title"/>" registry
  are shown in the table below:
          </t>
    <texttable title="Message Type registration procedures" anchor="mt-reg-proc-texttab">
    <ttcol align='left' width="8%">Range</ttcol>
    <ttcol align='left' width="33%">Registration Procedures</ttcol>
    <ttcol align='left' width="69%">Note</ttcol>
    <c>0-191</c>
    <c>Standards Action</c>
    <c></c>
    <c>192-247</c>
    <c>RFC Required</c>
    <c></c>
    <c>248-251</c>
    <c>Experimental Use</c>
    <c>Reserved,
          <table anchor="mt-reg-proc-texttab" align="center">
            <name>Message Types Registration Procedures</name>
            <thead>
              <tr>
                <th align="left">Range</th>
                <th align="left">Registration Procedures</th>
                <th align="left">Note</th>
              </tr>
            </thead>
            <tbody>
              <tr>
                <td align="left">0-191</td>
                <td align="left">Standards Action</td>
                <td align="left"/>
              </tr>
              <tr>
                <td align="left">192-247</td>
                <td align="left">RFC Required</td>
                <td align="left"/>
              </tr>
              <tr>
                <td align="left">248-251</td>
                <td align="left">Experimental Use</td>
                <td align="left">Reserved, not to be assigned</c>
    <c>252-255</c>
    <c>Private Use</c>
    <c>Reserved, assigned</td>
              </tr>
              <tr>
                <td align="left">252-255</td>
                <td align="left">Private Use</td>
                <td align="left">Reserved, not to be assigned</c>

</texttable> assigned</td>
              </tr>
            </tbody>
          </table>
          <t>
The updated assignments for the "Message Types" "<xref target="IANA-MT" format="title"/>" registry will look like this: appear as follows:
</t>

<texttable title="Assignments
          <table anchor="mt-texttab" align="center">
            <name>Assignments for the Message Types registry" anchor="mt-texttab">
    <ttcol align='left' width="8%">Value</ttcol>
    <ttcol align='left' width="62%">Meaning</ttcol>
    <ttcol align='left' width="40%">Reference</ttcol>
    <c>0</c>
    <c>Reserved</c>
    <c>This document</c>
    <c>1</c>
    <c>MPLS Registry</name>
            <thead>
              <tr>
                <th align="left">Value</th>
                <th align="left">Meaning</th>
                <th align="left">Reference</th>
              </tr>
            </thead>
            <tbody>
              <tr>
                <td align="left">0</td>
                <td align="left">Reserved</td>
                <td align="left">This document</td>
              </tr>
              <tr>
                <td align="left">1</td>
                <td align="left">MPLS Echo Request</c>
    <c> <xref target="RFC8029"/> </c>
    <c>2</c>
    <c>MPLS Request</td>
                <td align="left">
                  <xref target="RFC8029" format="default"/> </td>
              </tr>
              <tr>
                <td align="left">2</td>
                <td align="left">MPLS Echo Reply</c>
    <c> <xref target="RFC8029"/> </c>
    <c>3</c>
    <c> Reply</td>
                <td align="left">
                  <xref target="RFC8029" format="default"/> </td>
              </tr>
              <tr>
                <td align="left">3</td>
                <td align="left">	MPLS Proxy Ping Request</c>
    <c> <xref target="RFC7555"/> </c>
    <c>4</c>
    <c> Request</td>
                <td align="left">
                  <xref target="RFC7555" format="default"/> </td>
              </tr>
              <tr>
                <td align="left">4</td>
                <td align="left">	MPLS Proxy Ping Reply</c>
    <c> <xref target="RFC7555"/> </c>
    <c>5</c>
    <c> Reply</td>
                <td align="left">
                  <xref target="RFC7555" format="default"/> </td>
              </tr>
              <tr>
                <td align="left">5</td>
                <td align="left">	MPLS Relayed Echo Reply</c>
    <c> <xref target="RFC7743"/> </c>
    <c>6-247</c>
    <c>Unassigned</c>
    <c> </c>
    <c>248-251</c>
    <c>Reserved for Experimental Use</c>
    <c>This document</c>
    <c>252-255</c>
    <c>Reserved Reply</td>
                <td align="left">
                  <xref target="RFC7743" format="default"/> </td>
              </tr>
              <tr>
                <td align="left">6-247</td>
                <td align="left">Unassigned</td>
                <td align="left"> </td>
              </tr>
              <tr>
                <td align="left">248-251</td>
                <td align="left">Reserved for Experimental Use</td>
                <td align="left">This document</td>
              </tr>
              <tr>
                <td align="left">252-255</td>
                <td align="left">Reserved for Private Use</c>
    <c><xref target="RFC8029"/></c>
</texttable> Use</td>
                <td align="left">
                  <xref target="RFC8029" format="default"/></td>
              </tr>
            </tbody>
          </table>
        </section>
        <section anchor="rm-upd" title="Updates numbered="true" toc="default">
          <name>Updates to the Reply Modes registry"> Registry</name>
          <t>
  This is
  These are the changes to the "Reply Modes" "<xref target="IANA-RM" format="title"/>" registry specified in this document:
  <list style="symbols">
  <t>
          </t>
          <ul spacing="normal">
            <li>
  Code Point 0 (zero) is has been marked Reserved.
  </t>
  <t>
  </li>
            <li>
  The registration procedure "Specification Required" is has been changed to "RFC Required" Required",
  and the comment "Experimental RFC needed" is has been removed.
  </t>

  <t>
  </li>
            <li>
  Four code point points have been taken from what was earlier previously "Specification Required"
  to form a set of code points for "Experimental Use".
  </t>
  </list>
  </t>
  </li>
          </ul>
          <t>
  The registration procedures after the changes for the "Reply Modes" "<xref target="IANA-RM" format="title"/>" registry
  are show shown in the table below:
          </t>
    <texttable title="Reply
          <table anchor="rm-reg-prov-texttab" align="center">
            <name>Reply Modes registration procedures" anchor="rm-reg-prov-texttab">
    <ttcol align='left' width="8%">Range</ttcol>
    <ttcol align='left' width="33%">Registration Procedures</ttcol>
    <ttcol align='left' width="69%">Note</ttcol>
    <c>0-191</c>
    <c>Standards Action</c>
    <c></c>
    <c>192-247</c>
    <c>RFC Required</c>
    <c></c>
    <c>248-251</c>
    <c>Experimental Use</c>
    <c>Reserved, Registration Procedures</name>
            <thead>
              <tr>
                <th align="left">Range</th>
                <th align="left">Registration Procedures</th>
                <th align="left">Note</th>
              </tr>
            </thead>
            <tbody>
              <tr>
                <td align="left">0-191</td>
                <td align="left">Standards Action</td>
                <td align="left"/>
              </tr>
              <tr>
                <td align="left">192-247</td>
                <td align="left">RFC Required</td>
                <td align="left"/>
              </tr>
              <tr>
                <td align="left">248-251</td>
                <td align="left">Experimental Use</td>
                <td align="left">Reserved, not to be assigned</c>
    <c>252-255</c>
    <c>Private Use</c>
    <c>Reserved, assigned</td>
              </tr>
              <tr>
                <td align="left">252-255</td>
                <td align="left">Private Use</td>
                <td align="left">Reserved, not to be assigned</c>

</texttable> assigned</td>
              </tr>
            </tbody>
          </table>
          <t>
The updated assignments for the "Reply Modes" "<xref target="IANA-RM" format="title"/>" registry will look like this: are as follows:
</t>

<texttable title="Assignments
          <table anchor="rm-texttab" align="center">
            <name>Assignments for the Reply Modes registry" anchor="rm-texttab">
    <ttcol align='left' width="8%">Value</ttcol>
    <ttcol align='left' width="62%">Meaning</ttcol>
    <ttcol align='left' width="40%">Reference</ttcol>
    <c>0</c>
    <c>Reserved</c>
    <c>This document</c>
    <c>1</c>
    <c>Do not reply</c>
    <c> <xref target="RFC8029"/> </c>
    <c>2</c>
    <c>Reply Registry</name>
            <thead>
              <tr>
                <th align="left">Value</th>
                <th align="left">Meaning</th>
                <th align="left">Reference</th>
              </tr>
            </thead>
            <tbody>
              <tr>
                <td align="left">0</td>
                <td align="left">Reserved</td>
                <td align="left">This document</td>
              </tr>
              <tr>
                <td align="left">1</td>
                <td align="left">Do not reply</td>
                <td align="left">
                  <xref target="RFC8029" format="default"/> </td>
              </tr>
              <tr>
                <td align="left">2</td>
                <td align="left">Reply via an IPv4/IPv6 UDP packet</c>
    <c> <xref target="RFC8029"/> </c>
    <c>3</c>
    <c>Reply packet</td>
                <td align="left">
                  <xref target="RFC8029" format="default"/> </td>
              </tr>
              <tr>
                <td align="left">3</td>
                <td align="left">Reply via an IPv4/IPv6 UDP packet with Router Alert</c>
    <c> <xref target="RFC8029"/> </c>
    <c>4</c>
    <c> Alert</td>
                <td align="left">
                  <xref target="RFC8029" format="default"/> </td>
              </tr>
              <tr>
                <td align="left">4</td>
                <td align="left">	Reply via application-level control channel</c>
    <c> <xref target="RFC8029"/> </c>
    <c>5</c>
    <c>Reply channel</td>
                <td align="left">
                  <xref target="RFC8029" format="default"/> </td>
              </tr>
              <tr>
                <td align="left">5</td>
                <td align="left">Reply via Specified Path</c>
    <c> <xref target="RFC7110"/> </c>
    <c>6-247</c>
    <c>Unassigned</c>
    <c> </c>
    <c>248-251</c>
    <c>Reserved for Experimental Use</c>
    <c>This document</c>
    <c>252-255</c>
    <c>Reserved Path</td>
                <td align="left">
                  <xref target="RFC7110" format="default"/> </td>
              </tr>
              <tr>
                <td align="left">6-247</td>
                <td align="left">Unassigned</td>
                <td align="left"> </td>
              </tr>
              <tr>
                <td align="left">248-251</td>
                <td align="left">Reserved for Experimental Use</td>
                <td align="left">This document</td>
              </tr>
              <tr>
                <td align="left">252-255</td>
                <td align="left">Reserved for Private Use</c>
    <c><xref target="RFC8029"/></c>
</texttable> Use</td>
                <td align="left">
                  <xref target="RFC8029" format="default"/></td>
              </tr>
            </tbody>
          </table>
        </section>
        <section anchor="rc-upd" title="Updates numbered="true" toc="default">
          <name>Updates to the Return Codes registry"> Registry</name>
          <t>
  These are the changes to the "Return Codes" "<xref target="IANA-RC" format="title"/>" registry specified in this
  document:
  <list style="symbols">

  <t>
          </t>
          <ul spacing="normal">
            <li>
  The registration procedure "Specification Required" is has been changed to "RFC Required" Required",
  and the comment "Experimental RFC needed" is has been removed.
  </t>

  <t>
  </li>
            <li>
  Four code point points have been taken from what was earlier previously "Specification Required"
  to form a set of code points for "Experimental Use".
  </t>
  </list>
  </t>
  </li>
          </ul>
          <t>
  The registration procedures after the changes for the "Return Codes" "<xref target="IANA-RC" format="title"/>" registry
  are show shown in the table below:
          </t>
    <texttable title="Return
          <table anchor="rc-reg-proc-texttab" align="center">
            <name>Return Codes registration procedures" anchor="rc-reg-proc-texttab">
    <ttcol align='left' width="8%">Range</ttcol>
    <ttcol align='left' width="33%">Registration Procedures</ttcol>
    <ttcol align='left' width="69%">Note</ttcol>
    <c>0-191</c>
    <c>Standards Action</c>
    <c></c>
    <c>192-247</c>
    <c>RFC Required</c>
    <c></c>
    <c>248-251</c>
    <c>Experimental Use</c>
    <c>Reserved, Registration Procedures</name>
            <thead>
              <tr>
                <th align="left">Range</th>
                <th align="left">Registration Procedures</th>
                <th align="left">Note</th>
              </tr>
            </thead>
            <tbody>
              <tr>
                <td align="left">0-191</td>
                <td align="left">Standards Action</td>
                <td align="left"/>
              </tr>
              <tr>
                <td align="left">192-247</td>
                <td align="left">RFC Required</td>
                <td align="left"/>
              </tr>
              <tr>
                <td align="left">248-251</td>
                <td align="left">Experimental Use</td>
                <td align="left">Reserved, not to be assigned</c>
    <c>252-255</c>
    <c>Private Use</c>
    <c>Reserved, assigned</td>
              </tr>
              <tr>
                <td align="left">252-255</td>
                <td align="left">Private Use</td>
                <td align="left">Reserved, not to be assigned</c>

</texttable> assigned</td>
              </tr>
            </tbody>
          </table>
          <t>
The updated assignments for the "Return Codes" "<xref target="IANA-RC" format="title"/>" registry will look like this: are as follows:
	  </t>

<texttable title="Assignments

          <table anchor="rc-texttab" align="center">
            <name>Assignments for the Return Codes registry" anchor="rc-texttab">
    <ttcol align='left' width="8%">Value</ttcol>
    <ttcol align='left' width="62%">Meaning</ttcol>
    <ttcol align='left' width="40%">Reference</ttcol>

    <c>0</c>
    <c>No Registry</name>
            <thead>
              <tr>
                <th align="left">Value</th>
                <th align="left">Meaning</th>
                <th align="left">Reference</th>
              </tr>
            </thead>
            <tbody>
              <tr>
                <td align="left">0</td>
                <td align="left">No Return Code</c>
    <c>This document</c>

    <c>1</c>
    <c>Malformed Code</td>
                <td align="left"><xref target="RFC8029" format="default"/></td>
              </tr>
              <tr>
                <td align="left">1</td>
                <td align="left">Malformed echo request received</c>
    <c> <xref target="RFC8029"/> </c>

    <c>2</c>
    <c>One received</td>
                <td align="left">
                  <xref target="RFC8029" format="default"/> </td>
              </tr>
              <tr>
                <td align="left">2</td>
                <td align="left">One or more of the TLVs was not understood</c>
    <c> <xref target="RFC8029"/> </c>

    <c>3</c>
    <c>Replying understood</td>
                <td align="left">
                  <xref target="RFC8029" format="default"/> </td>
              </tr>
              <tr>
                <td align="left">3</td>
                <td align="left">Replying router is an egress for the FEC at stack-depth &lt;RSC&gt; </c>
    <c> <xref target="RFC8029"/> </c>

    <c>4</c>
    <c>Replying </td>
                <td align="left">
                  <xref target="RFC8029" format="default"/> </td>
              </tr>
              <tr>
                <td align="left">4</td>
                <td align="left">Replying router has no mapping for the FEC at stack-depth &lt;RSC&gt; </c>
    <c> <xref target="RFC8029"/> </c>

    <c>5</c>
    <c>Downstream </td>
                <td align="left">
                  <xref target="RFC8029" format="default"/> </td>
              </tr>
              <tr>
                <td align="left">5</td>
                <td align="left">Downstream Mapping Mismatch (See [1])</c>
    <c> <xref target="RFC8029"/> </c>

    <c>6</c>
    <c>Upstream [1])</td>
                <td align="left">
                  <xref target="RFC8029" format="default"/> </td>
              </tr>
              <tr>
                <td align="left">6</td>
                <td align="left">Upstream Interface Index Unknown (See [1])</c>
    <c> <xref target="RFC8029"/> </c>

    <c>7</c>
    <c>Reserved</c>
    <c> <xref target="RFC8029"/> </c>

    <c>8</c>
    <c>Label [1])</td>
                <td align="left">
                  <xref target="RFC8029" format="default"/> </td>
              </tr>
              <tr>
                <td align="left">7</td>
                <td align="left">Reserved</td>
                <td align="left">
                  <xref target="RFC8029" format="default"/> </td>
              </tr>
              <tr>
                <td align="left">8</td>
                <td align="left">Label switched at stack-depth &lt;RSC&gt; </c>
    <c> <xref target="RFC8029"/> </c>

    <c>9</c>
    <c>Label </td>
                <td align="left">
                  <xref target="RFC8029" format="default"/> </td>
              </tr>
              <tr>
                <td align="left">9</td>
                <td align="left">Label switched but no MPLS forwarding at stack-depth &lt;RSC&gt; </c>
    <c> <xref target="RFC8029"/> </c>

    <c>10</c>
    <c>Mapping &lt;RSC&gt; </td>
                <td align="left">
                  <xref target="RFC8029" format="default"/> </td>
              </tr>
              <tr>
                <td align="left">10</td>
                <td align="left">Mapping for this FEC is not the given label at stack-depth &lt;RSC&gt; </c>
    <c> <xref target="RFC8029"/> </c>

    <c>11</c>
    <c> </td>
                <td align="left">
                  <xref target="RFC8029" format="default"/> </td>
              </tr>
              <tr>
                <td align="left">11</td>
                <td align="left">	No label entry at stack-depth &lt;RSC&gt; </c>
    <c> <xref target="RFC8029"/> </c>

    <c>12</c>
    <c>Protocol </td>
                <td align="left">
                  <xref target="RFC8029" format="default"/> </td>
              </tr>
              <tr>
                <td align="left">12</td>
                <td align="left">Protocol not associated with interface at FEC stack-depth &lt;RSC&gt; </c>
    <c> <xref target="RFC8029"/> </c>

    <c>13</c>
    <c>Premature </td>
                <td align="left">
                  <xref target="RFC8029" format="default"/> </td>
              </tr>
              <tr>
                <td align="left">13</td>
                <td align="left">Premature termination of ping due to label stack shrinking to a single label</c>
    <c> <xref target="RFC8029"/> </c>

    <c>14</c>
    <c>See label</td>
                <td align="left">
                  <xref target="RFC8029" format="default"/> </td>
              </tr>
              <tr>
                <td align="left">14</td>
                <td align="left">See DDMAP TLV for meaning of Return Code and Return Subcode (See [2])</c>
    <c> <xref target="RFC8029"/> </c>

    <c>15</c>
    <c> [2])</td>
                <td align="left">
                  <xref target="RFC8029" format="default"/> </td>
              </tr>
              <tr>
                <td align="left">15</td>
                <td align="left">	Label switched with FEC change</c>
    <c> <xref target="RFC8029"/> </c>

    <c>16</c>
    <c>Proxy change</td>
                <td align="left">
                  <xref target="RFC8029" format="default"/> </td>
              </tr>
              <tr>
                <td align="left">16</td>
                <td align="left">Proxy Ping not authorized</c>
    <c> <xref target="RFC7555"/> </c>

    <c>17</c>
    <c>Proxy authorized</td>
                <td align="left">
                  <xref target="RFC7555" format="default"/> </td>
              </tr>
              <tr>
                <td align="left">17</td>
                <td align="left">Proxy Ping parameters need to be modified</c>
    <c> <xref target="RFC7555"/> </c>

    <c>18</c>
    <c>MPLS modified</td>
                <td align="left">
                  <xref target="RFC7555" format="default"/> </td>
              </tr>
              <tr>
                <td align="left">18</td>
                <td align="left">MPLS Echo Request could not be sent</c>
    <c> <xref target="RFC7555"/> </c>

    <c>19</c>
    <c>Replying sent</td>
                <td align="left">
                  <xref target="RFC7555" format="default"/> </td>
              </tr>
              <tr>
                <td align="left">19</td>
                <td align="left">Replying router has FEC mapping for topmost FEC</c>
    <c> <xref target="RFC7555"/> </c>

    <c>20</c>
    <c>One FEC</td>
                <td align="left">
                  <xref target="RFC7555" format="default"/> </td>
              </tr>
              <tr>
                <td align="left">20</td>
                <td align="left">One or more TLVs not returned due to MTU size</c>
    <c> <xref target="RFC7743"/> </c>

    <c>21</c>
    <c>OAM size</td>
                <td align="left">
                  <xref target="RFC7743" format="default"/> </td>
              </tr>
              <tr>
                <td align="left">21</td>
                <td align="left">OAM Problem/Unsupported BFD Version</c>
    <c> <xref target="RFC7759"/> </c>

    <c>22</c>
    <c> Version</td>
                <td align="left">
                  <xref target="RFC7759" format="default"/> </td>
              </tr>
              <tr>
                <td align="left">22</td>
                <td align="left">	OAM Problem/Unsupported BFD Encapsulation format</c>
    <c> <xref target="RFC7759"/> </c>

    <c>23</c>
    <c>OAM format</td>
                <td align="left">
                  <xref target="RFC7759" format="default"/> </td>
              </tr>
              <tr>
                <td align="left">23</td>
                <td align="left">OAM Problem/Unsupported BFD Authentication Type</c>
    <c> <xref target="RFC7759"/> </c>

    <c>24</c>
    <c>OAM Type</td>
                <td align="left">
                  <xref target="RFC7759" format="default"/> </td>
              </tr>
              <tr>
                <td align="left">24</td>
                <td align="left">OAM Problem/Mismatch of BFD Authentication Key ID</c>
    <c> <xref target="RFC7759"/> </c>

    <c>25</c>
    <c>OAM ID</td>
                <td align="left">
                  <xref target="RFC7759" format="default"/> </td>
              </tr>
              <tr>
                <td align="left">25</td>
                <td align="left">OAM Problem/Unsupported Timestamp Format</c>
    <c> <xref target="RFC7759"/> </c>

    <c>26</c>
    <c>OAM Format</td>
                <td align="left">
                  <xref target="RFC7759" format="default"/> </td>
              </tr>
              <tr>
                <td align="left">26</td>
                <td align="left">OAM Problem/Unsupported Delay Mode</c>
    <c> <xref target="RFC7759"/> </c>

    <c>27</c>
    <c>OAM Mode</td>
                <td align="left">
                  <xref target="RFC7759" format="default"/> </td>
              </tr>
              <tr>
                <td align="left">27</td>
                <td align="left">OAM Problem/Unsupported Loss Mode</c>
    <c> <xref target="RFC7759"/> </c>

    <c>28</c>
    <c>OAM Mode</td>
                <td align="left">
                  <xref target="RFC7759" format="default"/> </td>
              </tr>
              <tr>
                <td align="left">28</td>
                <td align="left">OAM Problem/Delay variation unsupported</c>
    <c> <xref target="RFC7759"/> </c>

    <c>29</c>
    <c>OAM unsupported</td>
                <td align="left">
                  <xref target="RFC7759" format="default"/> </td>
              </tr>
              <tr>
                <td align="left">29</td>
                <td align="left">OAM Problem/Dyadic mode unsupported</c>
    <c> <xref target="RFC7759"/> </c>

    <c>30</c>
    <c>OAM unsupported</td>
                <td align="left">
                  <xref target="RFC7759" format="default"/> </td>
              </tr>
              <tr>
                <td align="left">30</td>
                <td align="left">OAM Problem/Loopback mode unsupported</c>
    <c> <xref target="RFC7759"/> </c>

    <c>31</c>
    <c> unsupported</td>
                <td align="left">
                  <xref target="RFC7759" format="default"/> </td>
              </tr>
              <tr>
                <td align="left">31</td>
                <td align="left">	OAM Problem/Combined mode unsupported</c>
    <c> <xref target="RFC7759"/> </c>

    <c>32</c>
    <c> unsupported</td>
                <td align="left">
                  <xref target="RFC7759" format="default"/> </td>
              </tr>
              <tr>
                <td align="left">32</td>
                <td align="left">	OAM Problem/Fault management signaling unsupported</c>
    <c> <xref target="RFC7759"/> </c>

    <c>33</c>
    <c>OAM unsupported</td>
                <td align="left">
                  <xref target="RFC7759" format="default"/> </td>
              </tr>
              <tr>
                <td align="left">33</td>
                <td align="left">OAM Problem/Unable to create fault management association</c>
    <c> <xref target="RFC7759"/> </c>

    <c>34</c>
    <c> association</td>
                <td align="left">
                  <xref target="RFC7759" format="default"/> </td>
              </tr>
              <tr>
                <td align="left">34</td>
                <td align="left">	OAM Problem/PM Configuration Error</c>
    <c> <xref target="RFC7759"/> </c>

    <c>35</c>
    <c>Mapping Error</td>
                <td align="left">
                  <xref target="RFC7759" format="default"/> </td>
              </tr>
              <tr>
                <td align="left">35</td>
                <td align="left">Mapping for this FEC is not associated with the incoming interface  </c>
    <c> <xref target="RFC8287"/> sec 7.4</c>

    <c>36-247</c>
    <c>Unassigned</c>
    <c> </c>

    <c>248-251</c>
    <c>Reserved for Experimental Use</c>
    <c>This document</c>

    <c>252-255</c>
    <c>Reserved  </td>
                <td align="left">
                  <xref target="RFC8287" sectionFormat="comma" section="7.4"/></td>
              </tr>
              <tr>
                <td align="left">36-247</td>
                <td align="left">Unassigned</td>
                <td align="left"> </td>
              </tr>
              <tr>
                <td align="left">248-251</td>
                <td align="left">Reserved for Experimental Use</td>
                <td align="left">This document</td>
              </tr>
              <tr>
                <td align="left">252-255</td>
                <td align="left">Reserved for Private Use</c>
    <c><xref target="RFC8029"/></c>
</texttable>

<t> Use</td>
                <td align="left">
                  <xref target="RFC8029" format="default"/></td>
              </tr>
            </tbody>
          </table>
          <dl>
<dt>
Note 1: 1:</dt><dd> Notes [1] and [2] for code points 5, 6 6, and 14 point to footnotes in the
"Multiprotocol Label Switching (MPLS) Label Switched Paths (LSPs) Ping
Parameters"
"<xref target="IANA-LSP-PING" format="title"/>" namespace. The footnotes are not changed by this document.
</t>

<t>
</dd>
          <dt>
Note 2: 2:</dt><dd> &lt;RSC&gt; stands for "Return Subcode" and is explained in section 3.1 of
RFC 8029 <xref target="RFC8029"/>.
</t> target="RFC8029" sectionFormat="of" section="3.1"/>.
</dd></dl>
        </section>
      </section>
      <section anchor="upd-tls-sub-tlv" title="Updates numbered="true" toc="default">
        <name>Updates to the TLV and Sub-TLV registries"> Registries</name>
        <t>
  The updates to the TLV and the sub-TLV registries are mostly the same, however same; however,
  the <xref "<xref target="IANA-Sub-9" format="title"/> format="title"/>" <xref target="IANA-Sub-9"/>
  have target="IANA-Sub-9" format="default"/> registry has not been updated.
        </t>
        <t>
  Note that when a field in an assignment table says "EQ", it means that
  there is no change from the existing field in the
 "<xref target="lsp-ping-Namespace" format="title"/>" namespace
 <xref target="IANA-LSP-PING"/> target="IANA-LSP-PING" format="default"/>.
        </t>
        <section anchor="upds-tlv" title="Updates numbered="true" toc="default">
          <name>Updates to the TLVs registry"> Registry</name>
          <t>
  This section describes the new registration procedures and the assignments
  for the "<xref target="IANA-TLV-reg" format="title"/>" registry
  <xref target="IANA-TLV-reg"/> target="IANA-TLV-reg" format="default"/> that are based on the new registration procedures. them.
          </t>
          <t>
  The registration procedures have been changed, as follows, for the
  "<xref target="IANA-TLV-reg" format="title"/>"  registry.
          </t>

  <t>
  <list style="symbols">
  <t>
          <ul spacing="normal">
            <li>
  The "Specification Required" registration procedure has been changed to "RFC
  Required", the
  Required". The comment "Experimental RFC Required" has been removed.
  Note that when a field in an assignment table says "EQ", it means that
  there is no change from the existing field in the
 "<xref target="lsp-ping-Namespace" format="title"/>" namespace
 <xref target="IANA-LSP-PING"/>.

  </t>

  <t>
     RFC 8611 target="IANA-LSP-PING" format="default"/>.

  </li>
            <li>
     <xref target="RFC8611"/> was published after RFC 8126 <xref target="RFC8126"/> and uses the new terminology,
     e.g.
     e.g., "Private Use". The code points registration procedure "Private Use"
     has been replaced by the "First Come, Come First Served" code point registration
     proceedure.
  </t>

  <t>
     procedure.
  </li>
            <li>
  Two small sets, 4 four code points each, have been created for Experimental Use.
  </t>

  <t>
  </li>
            <li>
  Code points that are reserved are clearly marked as such.
  </t>

  <t>
  </li>
            <li>
  The assignments have been updated to match the new registration procedures.
  </t>

  <t>
  </li>
            <li>
  The notes related to the registration procedures have been changed to reflect
  whether or not a response is required or not if a TLV is not recognized.
  </t>

  </list>

  </t>
  </li>
          </ul>
          <t>
  The registration procedures for the "<xref target="IANA-TLV-reg" format="title"/>"
  registry <xref target="IANA-TLV-reg"/> will now look like this: target="IANA-TLV-reg" format="default"/> after the changes listed above are shown in the table below:
          </t>

   <texttable title="TLV
          <table anchor="tlv-reg-proc" align="center">
            <name>TLVs Registration Procedures" anchor="tlv-reg-proc">
    <ttcol align='left' width="8%">Range</ttcol>
    <ttcol align='left' width="33%">Registration Procedures</ttcol>
    <ttcol align='left' width="69%">Note</ttcol>
    <c>0-16383</c>
    <c>Standards Action</c>
    <c>This Procedures</name>
            <thead>
              <tr>
                <th align="left">Range</th>
                <th align="left">Registration Procedures</th>
                <th align="left">Note</th>
              </tr>
            </thead>
            <tbody>
              <tr>
                <td align="left">0-16383</td>
                <td align="left">Standards Action</td>
                <td align="left">This range is for TLVs that require an error message if not recognized.
    [This
    This document, section 3.1]</c>

    <c>16384-31739</c>
    <c>RFC Required</c>
    <c>This <xref target="principles"/></td>
              </tr>
              <tr>
                <td align="left">16384-31739</td>
                <td align="left">RFC Required</td>
                <td align="left">This range is for TLVs that require an error message if not recognized.
    [This
    This document, section 3.1]</c>

    <c>31740-31743</c>
    <c>Experimental Use</c>
    <c>Reserved, not <xref target="principles"/></td>
              </tr>
              <tr>
                <td align="left">31740-31743</td>
                <td align="left">Reserved for Experimental Use</td>
                <td align="left">Not to be assigned. This range is for sub-TLVs TLVs that require an error message if not recognized. [This This document, section 3.1]</c>

    <c>31744-32767</c>
    <c>FCFS</c>
    <c>This <xref target="principles"/></td>
              </tr>
              <tr>
                <td align="left">31744-32767</td>
                <td align="left">FCFS</td>
                <td align="left">This range is for TLVs that require an error message if not recognized. [This This document, section 3.1]</c>

    <c>32768-49161</c>
    <c>Standards Action</c>
    <c>This <xref target="principles"/></td>
              </tr>
              <tr>
                <td align="left">32768-49161</td>
                <td align="left">Standards Action</td>
                <td align="left">This range is for TLVs that can be silently dropped if not recognized.</c>

    <c>49162-64507</c>
    <c>RFC Required</c>
    <c>This recognized.</td>
              </tr>
              <tr>
                <td align="left">49162-64507</td>
                <td align="left">RFC Required</td>
                <td align="left">This range is for TLVs that can be silently dropped if not recognized.</c>

    <c>64508-64511</c>
    <c>Experimental Use</c>
    <c>Reserved, not recognized.</td>
              </tr>
              <tr>
                <td align="left">64508-64511</td>
                <td align="left">Reserved for Experimental Use</td>
                <td align="left">Not to be assigned. This range is for TLVs that can be silently dropped if not recognized.</c>

    <c>64512-65535</c>
    <c>FCFS</c>
    <c>This recognized.</td>
              </tr>
              <tr>
                <td align="left">64512-65535</td>
                <td align="left">FCFS</td>
                <td align="left">This range is for TLVs that can be silently dropped if not recognized.</c>

    </texttable> recognized.</td>
              </tr>
            </tbody>
          </table>
          <t>
    The <xref target="tlv-assign" format="title"/> will now look like this. updated assignments for this registry appear as follows:
          </t>
          <t>
       Note that when a field in an assignment table says "EQ", it means that
       there is was no change from the existing field in the
       "<xref target="lsp-ping-Namespace" format="title"/>" namespace
       <xref target="IANA-LSP-PING"/> target="IANA-LSP-PING" format="default"/>.

          </t>

    <texttable title="TLV Assignments" anchor="tlv-assign">
    <ttcol align='left' width="8%">Type</ttcol>
    <ttcol align='left' width="33%">TLV Name</ttcol>
    <ttcol align='left' width="69%">Reference</ttcol>
    <ttcol align='left' width="69%">Sub-TLV Registry</ttcol>

    <c>0</c>
    <c>Reserved</c>
    <c>This document</c>
    <c></c>

    <c>1-7</c>
    <c>EQ</c>
    <c>EQ</c>
    <c>EQ</c>

    <c>8</c>
    <c>Unassigned</c>
    <c></c>
    <c></c>

    <c>9-16</c>
    <c>EQ</c>
    <c>EQ</c>
    <c>EQ</c>

    <c>17-19</c>
    <c>unassigned</c>
    <c></c>
    <c></c>

    <c>20-27</c>
    <c>EQ</c>
    <c>EQ</c>
    <c>EQ</c>

    <c>28-31739</c>
    <c>Unassigned</c>
    <c></c>
    <c></c>

    <c>31740-31743</c>
    <c>Experimental Use</c>
    <c>This Document</c>
    <c>Reserved, not
          <table anchor="tlv-assign" align="center">
            <name>TLV Assignments</name>
            <thead>
              <tr>
                <th align="left">Type</th>
                <th align="left">TLV Name</th>
                <th align="left">Reference</th>
                <th align="left">Sub-TLV Registry</th>
              </tr>
            </thead>
            <tbody>
              <tr>
                <td align="left">0</td>
                <td align="left">Reserved</td>
                <td align="left">This document</td>
                <td align="left"/>
              </tr>
              <tr>
                <td align="left">1-7</td>
                <td align="left">EQ</td>
                <td align="left">EQ</td>
                <td align="left">EQ</td>
              </tr>
              <tr>
                <td align="left">8</td>
                <td align="left">Unassigned</td>
                <td align="left"/>
                <td align="left"/>
              </tr>
              <tr>
                <td align="left">9-16</td>
                <td align="left">EQ</td>
                <td align="left">EQ</td>
                <td align="left">EQ</td>
              </tr>
              <tr>
                <td align="left">17-19</td>
                <td align="left">Unassigned</td>
                <td align="left"/>
                <td align="left"/>
              </tr>
              <tr>
                <td align="left">20-27</td>
                <td align="left">EQ</td>
                <td align="left">EQ</td>
                <td align="left">EQ</td>
              </tr>
              <tr>
                <td align="left">28-31739</td>
                <td align="left">Unassigned</td>
                <td align="left"/>
                <td align="left"/>
              </tr>
              <tr>
                <td align="left">31740-31743</td>
                <td align="left">Reserved for Experimental Use</td>
                <td align="left">This document</td>
                <td align="left">Not to be assigned. This range is for sub-TLVs TLVs that require an error message if not recognized. [This This document, section 3.1]</c>

    <c>31744-32767</c>
    <c>Unassigned</c>
    <c></c>
    <c></c>

    <c>32768-32770</c>
    <c>EQ</c>
    <c>EQ</c>
    <c>EQ</c>

    <c>32771-64507</c>
    <c>EQ</c>
    <c>EQ</c>
    <c>EQ</c>

    <c>64508-64511</c>
    <c>Experimental Use.</c>
    <c>This document</c>
    <c>Reserved, not <xref target="principles"/></td>
              </tr>
              <tr>
                <td align="left">31744-32767</td>
                <td align="left">Unassigned</td>
                <td align="left"/>
                <td align="left"/>
              </tr>
              <tr>
                <td align="left">32768-32770</td>
                <td align="left">EQ</td>
                <td align="left">EQ</td>
                <td align="left">EQ</td>
              </tr>
              <tr>
                <td align="left">32771-64507</td>
                <td align="left">EQ</td>
                <td align="left">EQ</td>
                <td align="left">EQ</td>
              </tr>
              <tr>
                <td align="left">64508-64511</td>
                <td align="left">Reserved for Experimental Use</td>
                <td align="left">This document</td>
                <td align="left">Not to be assigned. This range is for TLVs that can be silently dropped if not recognized.</c>

    <c>64512-65535</c>
    <c>Unassigned</c>
    <c></c>
    <c></c>

               </texttable> recognized.</td>
              </tr>
              <tr>
                <td align="left">64512-65535</td>
                <td align="left">Unassigned</td>
                <td align="left"/>
                <td align="left"/>
              </tr>
            </tbody>
          </table>
        </section>
        <section anchor="upds-sub-tlv-1-16-21" title="Updates numbered="true" toc="default">
          <name>Updates to the registry Registry for Sub-TLVs for TLVs TLV Types 1, 16 16, and 21"> 21</name>
          <t>

  This section describes the new registration procedures and the assignments
  for the "<xref target="IANA-Sub-1-16-21" format="title" />" format="title"/>"
  <xref target="IANA-Sub-1-16-21"/> sub-registry target="IANA-Sub-1-16-21" format="default"/> subregistry that are based on the new registration
  procedures. them.
          </t>

  <t>
  <list style="symbols">
  <t>
          <ul spacing="normal">
            <li>
  The "Specification Required" registration procedure has been changed to "RFC
  Required", and the comment "Experimental RFC Required" has been removed.
  </t>

  <t>
  </li>
  <li>

  The code points registration procedure "Vendor Private Use" has been removed
  and replaced with "First
  Come,
  Come First Served" code points.
  </t>

  <t> procedure.
  </li>
            <li>
  Two small sets, 4 four code points each, have been created for Experimental Use.
  </t>

  <t>
  </li>
            <li>
  Code points that are reserved are clearly marked as such.
  </t>

  <t>
  </li>
            <li>
  The assignments have been updated to match the new registration procedures.

  </t>

  <t>

  </li>
            <li>
  The notes related to the registration procedures have been changed to reflect
  whether or not a response is required or not if a sub-TLV is not recognized.
  </t>

  </list>

  </t>
  </li>
          </ul>
          <t>
  The registration procedures for the "<xref target="IANA-Sub-1-16-21" format="title" />" format="title"/>"
  <xref target="IANA-Sub-1-16-21"/> sub-registry will now look like this: target="IANA-Sub-1-16-21" format="default"/> subregistry appear as follows after the changes listed above:
          </t>

   <texttable title="Registration
          <table anchor="sub-tlv-1-16-21-reg-proc" align="center">
            <name>Registration Procedures for Sub-TLVs for TLVs TLV Types 1, 16 16, and 21" anchor="sub-tlv-1-16-21-reg-proc">
    <ttcol align='left' width="8%">Range</ttcol>
    <ttcol align='left' width="33%">Registration Procedures</ttcol>
    <ttcol align='left' width="69%">Note</ttcol>
    <c>0-16383</c>
    <c>Standards Action</c>
    <c>This 21</name>
            <thead>
              <tr>
                <th align="left">Range</th>
                <th align="left">Registration Procedures</th>
                <th align="left">Note</th>
              </tr>
            </thead>
            <tbody>
              <tr>
                <td align="left">0-16383</td>
                <td align="left">Standards Action</td>
                <td align="left">This range is for sub-TLVs that require an error message if not recognized. [This This document, section 3.1]</c>

    <c>16384-31739</c>
    <c>RFC Required</c>
    <c>This <xref target="principles"/></td>
              </tr>
              <tr>
                <td align="left">16384-31739</td>
                <td align="left">RFC Required</td>
                <td align="left">This range is for sub-TLVs that require an error message if not recognized. [This This document, section 3.1]</c>

    <c>31740-31743</c>
    <c>Experimental Use</c>
    <c>Reserved, not <xref target="principles"/></td>
              </tr>
              <tr>
                <td align="left">31740-31743</td>
                <td align="left">Reserved for Experimental Use</td>
                <td align="left">Not to be assigned. This range is for sub-TLVs that require an error message if not recognized. [This This document, section 3.1]</c>

    <c>31744-32767</c>
    <c>FCFS</c>
    <c>This <xref target="principles"/></td>
              </tr>
              <tr>
                <td align="left">31744-32767</td>
                <td align="left">FCFS</td>
                <td align="left">This range is for sub-TLVs that require an error message if not recognized. [This This document, section 3.1]</c>

    <c>32768-49161</c>
    <c>Standards Action</c>
    <c>This <xref target="principles"/></td>
              </tr>
              <tr>
                <td align="left">32768-49161</td>
                <td align="left">Standards Action</td>
                <td align="left">This range is for sub-TLVs that can be silently dropped if not recognized.</c>

    <c>49162-64507</c>
    <c>RFC Required</c>
    <c>This recognized.</td>
              </tr>
              <tr>
                <td align="left">49162-64507</td>
                <td align="left">RFC Required</td>
                <td align="left">This range is for sub-TLVs that can be silently dropped if not recognized.</c>

    <c>64508-64511</c>
    <c>Experimental Use</c>
    <c>Reserved, not recognized.</td>
              </tr>
              <tr>
                <td align="left">64508-64511</td>
                <td align="left">Reserved for Experimental Use</td>
                <td align="left">Not to be assigned. This range is for TLVs sub-TLVs that can be silently dropped if not recognized.</c>

    <c>64512-65535</c>
    <c>FCFS</c>
    <c>This recognized.</td>
              </tr>
              <tr>
                <td align="left">64512-65535</td>
                <td align="left">FCFS</td>
                <td align="left">This range is for sub-TLVs that can be silently dropped if not recognized.</c>

    </texttable>

    <texttable title="Sub-TLV recognized.</td>
              </tr>
            </tbody>
          </table>

          <table anchor="sub-tlv-1-16-21-assign" align="center">
            <name>Sub-TLV for TLV TLVs 1, 16 16, and 21 Assignments" anchor="sub-tlv-1-16-21-assign">
    <ttcol align='left' width="8%">Type</ttcol>
    <ttcol align='left' width="33%">TLV Name</ttcol>
    <ttcol align='left' width="69%">Reference</ttcol>
    <ttcol align='left' width="69%">Comment</ttcol>

    <c>0</c>
    <c>Reserved</c>
    <c>This document</c>
    <c></c>

    <c>1-4</c>
    <c>EQ</c>
    <c>EQ</c>
    <c>EQ</c>

    <c>5</c>
    <c>Unassigned</c>
    <c></c>
    <c></c>

    <c>6-8</c>
    <c>EQ</c>
    <c>EQ</c>
    <c>EQ</c>

    <c>9</c>
    <c>EQ</c>
    <c>EQ</c>
    <c>DEPRECATED</c>

    <c>10-20</c>
    <c>EQ</c>
    <c>EQ</c>
    <c>EQ</c>

    <c>21</c>
    <c>unassigned</c>
    <c></c>
    <c></c>

    <c>22-37</c>
    <c>EQ</c>
    <c>EQ</c>
    <c>EQ</c>

    <c>38-31739</c>
    <c>Unassigned</c>
    <c></c>
    <c></c>

    <c>31740-31743</c>
    <c>Experimental Use</c>
    <c>This Document</c>
    <c>Reserved, not Assignments</name>
            <thead>
              <tr>
                <th align="left">Sub-Type</th>
                <th align="left">Sub-TLV Name</th>
                <th align="left">Reference</th>
                <th align="left">Comment</th>
              </tr>
            </thead>
            <tbody>
              <tr>
                <td align="left">0</td>
                <td align="left">Reserved</td>
                <td align="left">This document</td>
                <td align="left"/>
              </tr>
              <tr>
                <td align="left">1-4</td>
                <td align="left">EQ</td>
                <td align="left">EQ</td>
                <td align="left">EQ</td>
              </tr>
              <tr>
                <td align="left">5</td>
                <td align="left">Unassigned</td>
                <td align="left"/>
                <td align="left"/>
              </tr>
              <tr>
                <td align="left">6-8</td>
                <td align="left">EQ</td>
                <td align="left">EQ</td>
                <td align="left">EQ</td>
              </tr>
              <tr>
                <td align="left">9</td>
                <td align="left">EQ</td>
                <td align="left">EQ</td>
                <td align="left">DEPRECATED</td>
              </tr>
              <tr>
                <td align="left">10-20</td>
                <td align="left">EQ</td>
                <td align="left">EQ</td>
                <td align="left">EQ</td>
              </tr>
              <tr>
                <td align="left">21</td>
                <td align="left">Unassigned</td>
                <td align="left"/>
                <td align="left"/>
              </tr>
              <tr>
                <td align="left">22-37</td>
                <td align="left">EQ</td>
                <td align="left">EQ</td>
                <td align="left">EQ</td>
              </tr>
              <tr>
                <td align="left">38</td>
                <td align="left">PeerAdj SID Sub-TLV</td>
                <td align="left">[draft-ietf-mpls-sr-epe-oam-03]</td>
                <td align="left">TEMPORARY - registered 2021-05-11, expires 2022-05-11</td>
              </tr>
              <tr>
                <td align="left">39</td>
                <td align="left">PeerNode SID Sub-TLV</td>
                <td align="left">[draft-ietf-mpls-sr-epe-oam-03]</td>
                <td align="left">TEMPORARY - registered 2021-05-11, expires 2022-05-11</td>
              </tr>
              <tr>
                <td align="left">40</td>
                <td align="left">PeerSet SID Sub-TLV</td>
                <td align="left">[draft-ietf-mpls-sr-epe-oam-03]</td>
                <td align="left">TEMPORARY - registered 2021-05-11, expires 2022-05-11</td>
              </tr>
              <tr>
                <td align="left">41-31739</td>
                <td align="left">Unassigned</td>
                <td align="left"/>
                <td align="left"/>
              </tr>
              <tr>
                <td align="left">31740-31743</td>
                <td align="left">Reserved for Experimental Use</td>
                <td align="left">This document</td>
                <td align="left">Not to be assigned. This range is for sub-TLVs that require an error message if not recognized. [This This document, section 3.1]</c>

    <c>31744-64507</c>
    <c>Unassigned</c>
    <c></c>
    <c></c>

    <c>64508-64511</c>
    <c>Experimental Use</c>
    <c>This document</c>
    <c>Reserved, not <xref target="principles"/></td>
              </tr>
              <tr>
                <td align="left">31744-64507</td>
                <td align="left">Unassigned</td>
                <td align="left"/>
                <td align="left"/>
              </tr>
              <tr>
                <td align="left">64508-64511</td>
                <td align="left">Reserved for Experimental Use</td>
                <td align="left">This document</td>
                <td align="left">Not to be assigned. This range is for TLVs sub-TLVs that can be silently dropped if not recognized.</c>

    <c>64512-65535</c>
    <c>Unassigned</c>
    <c></c>
    <c></c>

               </texttable> recognized.</td>
              </tr>
              <tr>
                <td align="left">64512-65535</td>
                <td align="left">Unassigned</td>
                <td align="left"/>
                <td align="left"/>
              </tr>
            </tbody>
          </table>
        </section>

 <!-- section 6.3.3 -->

  <section anchor="upds-sub-tlv-6" title="Updates numbered="true" toc="default">
          <name>Updates to the registry Registry for Sub-TLVs for TLV 6"> Type 6</name>
          <t>

  This section describes the new registration procedures and the assignments
  for the "<xref target="IANA-Sub-6" format="title" />" format="title"/>" <xref target="IANA-Sub-6"/>
  sub-registry based on the new registration
  procedures. target="IANA-Sub-6" format="default"/>
  subregistry that are based on them.
          </t>

  <t>
  <list style="symbols">

  <t>
     RFC 8611
          <ul spacing="normal">
            <li>
     <xref target="RFC8611"/> was published after RFC 8126 <xref target="RFC8126"/> and uses the new terminology,
     e.g.
     e.g., "Private Use". The code points registration procedure "Private Use"
     has been replaced by the "First come, Come First Served" code point registration
     proceedure.
  </t>

  <t>
     procedure.
  </li>
            <li>
  Two small sets, 4 four code points each, have been created for Experimental Use.
  </t>

  <t>
  </li>
            <li>
  Code points that are reserved are clearly marked as such.
  </t>

  <t>
  </li>
            <li>
  The assignments have been updated to match the new registration procedures.

  </t>

  <t>

  </li>
            <li>
  The notes related to the registration procedures have been changed to reflect
  whether or not a response is required or not if a sub-TLV is not recognized.
  </t>

  </list>

  </t>
  </li>
          </ul>
          <t>
  The registration procedures for the "<xref target="IANA-Sub-6" format="title" />" format="title"/>"
  <xref target="IANA-Sub-6"/> sub-registry will now look like this: target="IANA-Sub-6" format="default"/> subregistry after the changes listed above are shown in the table below:
          </t>

   <texttable title="Registration
          <table anchor="sub-tlv-6-reg-proc" align="center">
            <name>Registration Procedures for Sub-TLVs for TLVs 6" anchor="sub-tlv-6-reg-proc">
    <ttcol align='left' width="8%">Range</ttcol>
    <ttcol align='left' width="33%">Registration Procedures</ttcol>
    <ttcol align='left' width="69%">Note</ttcol>
    <c>0-16383</c>
    <c>Standards Action</c>
    <c>This TLV Type 6</name>
            <thead>
              <tr>
                <th align="left">Range</th>
                <th align="left">Registration Procedures</th>
                <th align="left">Note</th>
              </tr>
            </thead>
            <tbody>
              <tr>
                <td align="left">0-16383</td>
                <td align="left">Standards Action</td>
                <td align="left">This range is for sub-TLVs that require an error message if not recognized. [This This document, section 3.1]</c>

    <c>16384-31739</c>
    <c>RFC Required</c>
    <c>This <xref target="principles"/></td>
              </tr>
              <tr>
                <td align="left">16384-31739</td>
                <td align="left">RFC Required</td>
                <td align="left">This range is for sub-TLVs that require an error message if not recognized. [This This document, section 3.1]</c>

    <c>31740-31743</c>
    <c>Experimental Use</c>
    <c>Reserved, not <xref target="principles"/></td>
              </tr>
              <tr>
                <td align="left">31740-31743</td>
                <td align="left">Reserved for Experimental Use</td>
                <td align="left">Not to be assigned. This range is for sub-TLVs that require an error message if not recognized. [This This document, section 3.1]</c>

    <c>31744-32767</c>
    <c>FCFS</c>
    <c>This <xref target="principles"/></td>
              </tr>
              <tr>
                <td align="left">31744-32767</td>
                <td align="left">FCFS</td>
                <td align="left">This range is for sub-TLVs that require an error message if not recognized. [This This document, section 3.1]</c>

    <c>32768-49161</c>
    <c>Standards Action</c>
    <c>This <xref target="principles"/></td>
              </tr>
              <tr>
                <td align="left">32768-49161</td>
                <td align="left">Standards Action</td>
                <td align="left">This range is for sub-TLVs that can be silently dropped if not recognized.</c>

    <c>49162-64507</c>
    <c>RFC Required</c>
    <c>This recognized.</td>
              </tr>
              <tr>
                <td align="left">49162-64507</td>
                <td align="left">RFC Required</td>
                <td align="left">This range is for sub-TLVs that can be silently dropped if not recognized.</c>

    <c>64508-64511</c>
    <c>Experimental Use</c>
    <c>Reserved, not recognized.</td>
              </tr>
              <tr>
                <td align="left">64508-64511</td>
                <td align="left">Reserved for Experimental Use</td>
                <td align="left">Not to be assigned. This range is for TLVs sub-TLVs that can be silently dropped if not recognized.</c>

    <c>64512-65535</c>
    <c>FCFS</c>
    <c>This recognized.</td>
              </tr>
              <tr>
                <td align="left">64512-65535</td>
                <td align="left">FCFS</td>
                <td align="left">This range is for sub-TLVs that can be silently dropped if not recognized.</c>

    </texttable>

    <texttable title="Sub-TLVs recognized.</td>
              </tr>
            </tbody>
          </table>

          <table anchor="sub-tlv-6-assign" align="center">
            <name>Sub-TLVs for TLV Type 6 Assignments" anchor="sub-tlv-6-assign">
    <ttcol align='left' width="8%">Type</ttcol>
    <ttcol align='left' width="33%">TLV Name</ttcol>
    <ttcol align='left' width="69%">Reference</ttcol>
    <ttcol align='left' width="69%">Comment</ttcol>

    <c>0</c>
    <c>Reserved</c>
    <c>This document</c>
    <c></c>

    <c>1-2</c>
    <c>EQ</c>
    <c>EQ</c>
    <c>EQ</c>

    <c>3-31739</c>
    <c>Unassigned</c>
    <c></c>
    <c></c>

    <c>31740-31743</c>
    <c>Experimental Use</c>
    <c>This Document</c>
    <c>Reserved, not Assignments</name>
            <thead>
              <tr>
                <th align="left">Sub-Type</th>
                <th align="left">Sub-TLV Name</th>
                <th align="left">Reference</th>
                <th align="left">Comment</th>
              </tr>
            </thead>
            <tbody>
              <tr>
                <td align="left">0</td>
                <td align="left">Reserved</td>
                <td align="left">This document, <xref target="RFC8611"/></td>
                <td align="left"/>
              </tr>
              <tr>
                <td align="left">1-2</td>
                <td align="left">EQ</td>
                <td align="left">EQ</td>
                <td align="left">EQ</td>
              </tr>
              <tr>
                <td align="left">3-31739</td>
                <td align="left">Unassigned</td>
                <td align="left"/>
                <td align="left"/>
              </tr>
              <tr>
                <td align="left">31740-31743</td>
                <td align="left">Reserved for Experimental Use</td>
                <td align="left">This document</td>
                <td align="left">Not to be assigned. This range is for sub-TLVs that require an error message if not recognized. [This This document, section 3.1]</c>

    <c>31744-64507</c>
    <c>Unassigned</c>
    <c></c>
    <c></c>

    <c>64508-64511</c>
    <c>Experimental Use.</c>
    <c>This document</c>
    <c>Reserved, not <xref target="principles"/></td>
              </tr>
              <tr>
                <td align="left">31744-64507</td>
                <td align="left">Unassigned</td>
                <td align="left"/>
                <td align="left"/>
              </tr>
              <tr>
                <td align="left">64508-64511</td>
                <td align="left">Reserved for Experimental Use</td>
                <td align="left">This document</td>
                <td align="left">Not to be assigned. This range is for TLVs sub-TLVs that can be silently dropped if not recognized.</c>

    <c>64512-65535</c>
    <c>Unassigned</c>
    <c></c>
    <c></c>

               </texttable> recognized.</td>
              </tr>
              <tr>
                <td align="left">64512-65535</td>
                <td align="left">Unassigned</td>
                <td align="left"/>
                <td align="left"/>
              </tr>
            </tbody>
          </table>
        </section>

  <!-- section 6.3.4 -->

   <section anchor="upds-sub-tlv-11" title="Updates numbered="true" toc="default">
          <name>Updates to the registry Registry for Sub-TLVs for TLV 11"> Type 11</name>
          <t>

  This section describes the new registration procedures and the assignments
  for the "<xref target="IANA-Sub-11" format="title" />" format="title"/>" <xref target="IANA-Sub-11"/>
  sub-registry target="IANA-Sub-11" format="default"/>
  subregistry that are based on the new registration
  procedures. them.
          </t>

  <t>
  <list style="symbols">
  <t>
          <ul spacing="normal">
            <li>
  The "Specification Required" registration procedure has been changed to "RFC
  Required", and the comment "Experimental RFC Required" has been removed.
  </t>

  <t>
  </li>
            <li>
  The code points registration procedure "Vendor Private Use" has been removed
  and replaced with "First
  Come,
  Come First Served" code points.
  </t>

  <t>
  </li>
            <li>
  Two small sets, 4 four code points each, have been created for Experimental Use.
  </t>

  <t>
  </li>
            <li>
  Code points that are reserved are clearly marked as such.
  </t>

  <t>
  </li>
            <li>
  The assignments have been updated to match the new registration procedures.

  </t>

  <t>

  </li>
            <li>
  The notes related to the registration procedures have been changed to reflect
  whether or not a response is required or not if a sub-TLV is not recognized.
  </t>

  </list>

  </t>
  </li>
          </ul>
          <t>
  The registration procedures for the "<xref target="IANA-Sub-11" format="title" />" format="title"/>"
  <xref target="IANA-Sub-11"/> sub-registry will now look like this: target="IANA-Sub-11" format="default"/> subregistry after the changes listed above are shown in the table below:
          </t>

   <texttable title="Registration
          <table anchor="sub-tlv-11-reg-proc" align="center">
            <name>Registration Procedures for Sub-TLVs for TLVs 11" anchor="sub-tlv-11-reg-proc">
    <ttcol align='left' width="8%">Range</ttcol>
    <ttcol align='left' width="33%">Registration Procedures</ttcol>
    <ttcol align='left' width="69%">Note</ttcol>

    <c>0-16383</c>
    <c>Standards Action</c>
    <c>This TLV Type 11</name>
            <thead>
              <tr>
                <th align="left">Range</th>
                <th align="left">Registration Procedures</th>
                <th align="left">Note</th>
              </tr>
            </thead>
            <tbody>
              <tr>
                <td align="left">0-16383</td>
                <td align="left">Standards Action</td>
                <td align="left">This range is for sub-TLVs that require an error message if not recognized. [This This document, section 3.1]</c>

    <c>16384-31739</c>
    <c>RFC Required</c>
    <c>This <xref target="principles"/></td>
              </tr>
              <tr>
                <td align="left">16384-31739</td>
                <td align="left">RFC Required</td>
                <td align="left">This range is for sub-TLVs that require an error message if not recognized. [This This document, section 3.1]</c>

    <c>31740-31743</c>
    <c>Experimental Use</c>
    <c>Reserved, not <xref target="principles"/></td>
              </tr>
              <tr>
                <td align="left">31740-31743</td>
                <td align="left">Reserved for Experimental Use</td>
                <td align="left">Not to be assigned. This range is for sub-TLVs that require an error message if not recognized. [This This document, section 3.1]</c>

    <c>31744-32767</c>
    <c>FCFS</c>
    <c>This <xref target="principles"/></td>
              </tr>
              <tr>
                <td align="left">31744-32767</td>
                <td align="left">FCFS</td>
                <td align="left">This range is for sub-TLVs that require an error message if not recognized. [This This document, section 3.1]</c>

    <c>32768-49161</c>
    <c>Standards Action</c>
    <c>This <xref target="principles"/></td>
              </tr>
              <tr>
                <td align="left">32768-49161</td>
                <td align="left">Standards Action</td>
                <td align="left">This range is for sub-TLVs that can be silently dropped if not recognized.</c>

    <c>49162-64507</c>
    <c>RFC Required</c>
    <c>This recognized.</td>
              </tr>
              <tr>
                <td align="left">49162-64507</td>
                <td align="left">RFC Required</td>
                <td align="left">This range is for sub-TLVs that can be silently dropped if not recognized.</c>

    <c>64508-64511</c>
    <c>Experimental Use</c>
    <c>Reserved, not recognized.</td>
              </tr>
              <tr>
                <td align="left">64508-64511</td>
                <td align="left">Reserved for Experimental Use</td>
                <td align="left">Not to be assigned. This range is for TLVs sub-TLVs that can be silently dropped if not recognized.</c>

    <c>64512-65535</c>
    <c>FCFS</c>
    <c>This recognized.</td>
              </tr>
              <tr>
                <td align="left">64512-65535</td>
                <td align="left">FCFS</td>
                <td align="left">This range is for sub-TLVs that can be silently dropped if not recognized.</c>

    </texttable>

    <texttable title="Sub-TLVs recognized.</td>
              </tr>
            </tbody>
          </table>
          <table anchor="sub-tlv-11-assign" align="center">
            <name>Sub-TLVs for TLV Type 11 Assignments" anchor="sub-tlv-11-assign">
    <ttcol align='left' width="8%">Type</ttcol>
    <ttcol align='left' width="33%">TLV Name</ttcol>
    <ttcol align='left' width="69%">Reference</ttcol>
    <ttcol align='left' width="69%">Comment</ttcol>

    <c>0</c>
    <c>Reserved</c>
    <c>This document</c>
    <c></c>

    <c>1-4</c>
    <c>EQ</c>
    <c>EQ</c>
    <c>EQ</c>

    <c>5-31739</c>
    <c>Unassigned</c>
    <c></c>
    <c></c>

    <c>31740-31743</c>
    <c>Experimental Use</c>
    <c>This Document</c>
    <c>Reserved, not Assignments</name>
            <thead>
              <tr>
                <th align="left">Sub-Type</th>
                <th align="left">Sub-TLV Name</th>
                <th align="left">Reference</th>
                <th align="left">Comment</th>
              </tr>
            </thead>
            <tbody>
              <tr>
                <td align="left">0</td>
                <td align="left">Reserved</td>
                <td align="left">This document</td>
                <td align="left"/>
              </tr>
              <tr>
                <td align="left">1-4</td>
                <td align="left">EQ</td>
                <td align="left">EQ</td>
                <td align="left">EQ</td>
              </tr>
              <tr>
                <td align="left">5-31739</td>
                <td align="left">Unassigned</td>
                <td align="left"/>
                <td align="left"/>
              </tr>
              <tr>
                <td align="left">31740-31743</td>
                <td align="left">Reserved for Experimental Use</td>
                <td align="left">This document</td>
                <td align="left">Not to be assigned. This range is for sub-TLVs that require an error message if not recognized. [This This document, section 3.1]</c>

    <c>31744-64507</c>
    <c>Unassigned</c>
    <c></c>
    <c></c>

    <c>64508-64511</c>
    <c>Experimental Use</c>
    <c>This document</c>
    <c>Reserved, not <xref target="principles"/></td>
              </tr>
              <tr>
                <td align="left">31744-64507</td>
                <td align="left">Unassigned</td>
                <td align="left"/>
                <td align="left"/>
              </tr>
              <tr>
                <td align="left">64508-64511</td>
                <td align="left">Reserved for Experimental Use</td>
                <td align="left">This document</td>
                <td align="left">Not to be assigned. This range is for TLVs sub-TLVs that can be silently dropped if not recognized.</c>

    <c>64512-65535</c>
    <c>Unassigned</c>
    <c></c>
    <c></c>

               </texttable> recognized.</td>
              </tr>
              <tr>
                <td align="left">64512-65535</td>
                <td align="left">Unassigned</td>
                <td align="left"/>
                <td align="left"/>
              </tr>
            </tbody>
          </table>
        </section>
        <section anchor="upds-sub-tlv-20" title="Updates numbered="true" toc="default">
          <name>Updates to the registry Registry for Sub-TLVs for TLV 20"> Type 20</name>
          <t>

  This section describes the new registration procedures and the assignments
  for the "<xref target="IANA-Sub-20" format="title" />" format="title"/>" <xref target="IANA-Sub-20"/>
  sub-registry target="IANA-Sub-20" format="default"/>
  subregistry that are based on the new registration
  procedures. them.
          </t>

  <t>
  <list style="symbols">
  <t>
          <ul spacing="normal">
            <li>
  The "Specification Required" registration procedure has been changed to "RFC
  Required", and the comment "Experimental RFC Required" has been removed.
  </t>

  <t>
  </li>
            <li>
  The code points registration procedure "Vendor Private Use" has been removed
  and replaced with "First
  Come,
  Come First Served" code points.
  </t>

  <t>
  </li>

            <li>
  Two small sets, 4 four code ve points each, have been created for Experimental Use.
  </t>

  <t>
  </li>
            <li>
  Code points that are reserved are clearly marked as such.
  </t>

  <t>
  </li>
            <li>
  The assignments have been updated to match the new registration procedures.

  </t>

  <t>

  </li>
            <li>
  The notes related to the registration procedures have been changed to reflect
  whether or not a response is required or not if a sub-TLV is not recognized.
  </t>

  </list>

  </t>
  </li>
          </ul>
          <t>
  The registration procedures for the "<xref target="IANA-Sub-20" format="title" />" format="title"/>"
  <xref target="IANA-Sub-20"/> sub-registry will now look like this: target="IANA-Sub-20" format="default"/> subregistry after the changes listed above are shown in the table below:
          </t>

   <texttable title="Registration
          <table anchor="sub-tlv-20-reg-proc" align="center">
            <name>Registration Procedures for Sub-TLVs for TLVs 20" anchor="sub-tlv-20-reg-proc">
    <ttcol align='left' width="8%">Range</ttcol>
    <ttcol align='left' width="33%">Registration Procedures</ttcol>
    <ttcol align='left' width="69%">Note</ttcol>

    <c>0-16383</c>
    <c>Standards Action</c>
    <c>This TLV Type 20</name>
            <thead>
              <tr>
                <th align="left">Range</th>
                <th align="left">Registration Procedures</th>
                <th align="left">Note</th>
              </tr>
            </thead>
            <tbody>
              <tr>
                <td align="left">0-16383</td>
                <td align="left">Standards Action</td>
                <td align="left">This range is for sub-TLVs that require an error message if not recognized. [This This document, section 3.1]</c>

    <c>16384-31739</c>
    <c>RFC Required</c>
    <c>This <xref target="principles"/>]</td>
              </tr>
              <tr>
                <td align="left">16384-31739</td>
                <td align="left">RFC Required</td>
                <td align="left">This range is for sub-TLVs that require an error message if not recognized. [This This document, section 3.1]</c>

    <c>31740-31743</c>
    <c>Experimental Use</c>
    <c>Reserved, not <xref target="principles"/>]</td>
              </tr>
              <tr>
                <td align="left">31740-31743</td>
                <td align="left">Reserved for Experimental Use</td>
                <td align="left">Not to be assigned. This range is for sub-TLVs that require an error message if not recognized. [This This document, section 3.1]</c>

    <c>31744-32767</c>
    <c>FCFS</c>
    <c>This <xref target="principles"/>]</td>
              </tr>
              <tr>
                <td align="left">31744-32767</td>
                <td align="left">FCFS</td>
                <td align="left">This range is for sub-TLVs that require an error message if not recognized. [This This document, section 3.1]</c>

    <c>32768-49161</c>
    <c>Standards Action</c>
    <c>This <xref target="principles"/>]</td>
              </tr>
              <tr>
                <td align="left">32768-49161</td>
                <td align="left">Standards Action</td>
                <td align="left">This range is for sub-TLVs that can be silently dropped if not recognized.</c>

    <c>49162-64507</c>
    <c>RFC Required</c>
    <c>This recognized.</td>
              </tr>
              <tr>
                <td align="left">49162-64507</td>
                <td align="left">RFC Required</td>
                <td align="left">This range is for sub-TLVs that can be silently dropped if not recognized.</c>

    <c>64508-64511</c>
    <c>Experimental Use</c>
    <c>Reserved, not recognized.</td>
              </tr>
              <tr>
                <td align="left">64508-64511</td>
                <td align="left">Reserved for Experimental Use</td>
                <td align="left">Not to be assigned. This range is for TLVs sub-TLVs that can be silently dropped if not recognized.</c>

    <c>64512-65535</c>
    <c>FCFS</c>
    <c>This recognized.</td>
              </tr>
              <tr>
                <td align="left">64512-65535</td>
                <td align="left">FCFS</td>
                <td align="left">This range is for sub-TLVs that can be silently dropped if not recognized.</c>

    </texttable>

    <texttable title="Sub-TLVs recognized.</td>
              </tr>
            </tbody>
          </table>

          <table anchor="sub-tlv-20-assign" align="center">
            <name>Sub-TLVs for TLV Type 20 Assignments" anchor="sub-tlv-20-assign">
    <ttcol align='left' width="8%">Type</ttcol>
    <ttcol align='left' width="33%">TLV Name</ttcol>
    <ttcol align='left' width="69%">Reference</ttcol>
    <ttcol align='left' width="69%">Comment</ttcol>

    <c>0</c>
    <c>Reserved</c>
    <c>This document</c>
    <c></c>

    <c>1-5</c>
    <c>EQ</c>
    <c>EQ</c>
    <c>EQ</c>

    <c>6-31739</c>
    <c>Unassigned</c>
    <c></c>
    <c></c>

    <c>31740-31743</c>
    <c>Experimental Use</c>
    <c>This Document</c>
    <c>Reserved, not Assignments</name>
            <thead>
              <tr>
                <th align="left">Sub-Type</th>
                <th align="left">Sub-TLV Name</th>
                <th align="left">Reference</th>
                <th align="left">Comment</th>
              </tr>
            </thead>
            <tbody>
              <tr>
                <td align="left">0</td>
                <td align="left">Reserved</td>
                <td align="left">This document</td>
                <td align="left"/>
              </tr>
              <tr>
                <td align="left">1-5</td>
                <td align="left">EQ</td>
                <td align="left">EQ</td>
                <td align="left">EQ</td>
              </tr>
              <tr>
                <td align="left">6-31739</td>
                <td align="left">Unassigned</td>
                <td align="left"/>
                <td align="left"/>
              </tr>
              <tr>
                <td align="left">31740-31743</td>
                <td align="left">Reserved for Experimental Use</td>
                <td align="left">This document</td>
                <td align="left">Not to be assigned. This range is for sub-TLVs that require an error message if not recognized. [This This document, section 3.1]</c>

    <c>31744-64507</c>
    <c>Unassigned</c>
    <c></c>
    <c></c>

    <c>64508-64511</c>
    <c>Experimental Use</c>
    <c>This document</c>
    <c>Reserved, not <xref target="principles"/>]</td>
              </tr>
              <tr>
                <td align="left">31744-64507</td>
                <td align="left">Unassigned</td>
                <td align="left"/>
                <td align="left"/>
              </tr>
              <tr>
                <td align="left">64508-64511</td>
                <td align="left">Reserved for Experimental Use</td>
                <td align="left">This document</td>
                <td align="left">Not to be assigned. This range is for TLVs sub-TLVs that can be silently dropped if not recognized.</c>

    <c>64512-65535</c>
    <c>Unassigned</c>
    <c></c>
    <c></c>

               </texttable> recognized.</td>
              </tr>
              <tr>
                <td align="left">64512-65535</td>
                <td align="left">Unassigned</td>
                <td align="left"/>
                <td align="left"/>
              </tr>
            </tbody>
          </table>
        </section>
        <section anchor="upds-sub-tlv-23" title="Updates numbered="true" toc="default">
          <name>Updates to the registry Registry for Sub-TLVs for TLV 23"> Type 23</name>
          <t>

  This section describes the new registration procedures and the assignments
  for the "<xref target="IANA-Sub-23" format="title" />" format="title"/>" <xref target="IANA-Sub-23"/>
  sub-registry target="IANA-Sub-23" format="default"/>
  subregistry that are based on the new registration
  procedures. them.
          </t>

  <t>
  <list style="symbols">
  <t>
          <ul spacing="normal">
            <li>
  The "Specification Required" registration procedure has been changed to "RFC
  Required", and the comment "Experimental RFC Required" has been removed.
  </t>

  <t>
  </li>
            <li>
  The code points registration procedure "Vendor Private Use" has been removed
  and replaced with "First
  Come,
  Come First Served" code points.
  </t>

  <t>
  </li>
            <li>
  Two small sets, 4 four code points each, have been created for Experimental Use.
  </t>

  <t>
  </li>
            <li>
  Code points that are reserved are clearly marked as such.
  </t>

  <t>
  </li>
            <li>
  The assignments have been updated to match the new registration procedures.

  </t>

  <t>

  </li>
            <li>
  The notes related to the registration procedures have been changed to reflect
  whether or not a response is required or not if a sub-TLV is not recognized.
  </t>

  </list>

  </t>
  </li>
          </ul>
          <t>
  The registration procedures for the "<xref target="IANA-Sub-23" format="title" />" format="title"/>"
  <xref target="IANA-Sub-23"/> sub-registry will now look like this: target="IANA-Sub-23" format="default"/> subregistry after the changes listed above are shown in the table below:
          </t>

   <texttable title="Registration
          <table anchor="sub-tlv-23-reg-proc" align="center">
            <name>Registration Procedures for Sub-TLVs for TLVs 23" anchor="sub-tlv-23-reg-proc">
    <ttcol align='left' width="8%">Range</ttcol>
    <ttcol align='left' width="33%">Registration Procedures</ttcol>
    <ttcol align='left' width="69%">Note</ttcol>

    <c>0-16383</c>
    <c>Standards Action</c>
    <c>This TLV Type 23</name>
            <thead>
              <tr>
                <th align="left">Range</th>
                <th align="left">Registration Procedures</th>
                <th align="left">Note</th>
              </tr>
            </thead>
            <tbody>
              <tr>
                <td align="left">0-16383</td>
                <td align="left">Standards Action</td>
                <td align="left">This range is for sub-TLVs that require an error message if not recognized. [This This document, section 3.1]</c>

    <c>16384-31739</c>
    <c>RFC Required</c>
    <c>This <xref target="principles"/>]</td>
              </tr>
              <tr>
                <td align="left">16384-31739</td>
                <td align="left">RFC Required</td>
                <td align="left">This range is for sub-TLVs that require an error message if not recognized. [This This document, section 3.1]</c>

    <c>31740-31743</c>
    <c>Experimental Use</c>
    <c>Reserved, not <xref target="principles"/>]</td>
              </tr>
              <tr>
                <td align="left">31740-31743</td>
                <td align="left">Reserved for Experimental Use</td>
                <td align="left">Not to be assigned. This range is for sub-TLVs that require an error message if not recognized. [This This document, section 3.1]</c>

    <c>31744-32767</c>
    <c>FCFS</c>
    <c>This <xref target="principles"/>]</td>
              </tr>
              <tr>
                <td align="left">31744-32767</td>
                <td align="left">FCFS</td>
                <td align="left">This range is for sub-TLVs that require an error message if not recognized. [This This document, section 3.1]</c>

    <c>32768-49161</c>
    <c>Standards Action</c>
    <c>This <xref target="principles"/>]</td>
              </tr>
              <tr>
                <td align="left">32768-49161</td>
                <td align="left">Standards Action</td>
                <td align="left">This range is for sub-TLVs that can be silently dropped if not recognized.</c>

    <c>49162-64507</c>
    <c>RFC Required</c>
    <c>This recognized.</td>
              </tr>
              <tr>
                <td align="left">49162-64507</td>
                <td align="left">RFC Required</td>
                <td align="left">This range is for sub-TLVs that can be silently dropped if not recognized.</c>

    <c>64508-64511</c>
    <c>Experimental Use</c>
    <c>Reserved, not recognized.</td>
              </tr>
              <tr>
                <td align="left">64508-64511</td>
                <td align="left">Reserved for Experimental Use</td>
                <td align="left">Not to be assigned. This range is for TLVs sub-TLVs that can be silently dropped if not recognized.</c>

    <c>64512-65535</c>
    <c>FCFS</c>
    <c>This recognized.</td>
              </tr>
              <tr>
                <td align="left">64512-65535</td>
                <td align="left">FCFS</td>
                <td align="left">This range is for sub-TLVs that can be silently dropped if not recognized.</c>

    </texttable>

    <texttable title="Sub-TLVs recognized.</td>
              </tr>
            </tbody>
          </table>
          <table anchor="sub-tlv-23-assign" align="center">
            <name>Sub-TLVs for TLV Type 23 Assignments" anchor="sub-tlv-23-assign">
    <ttcol align='left' width="8%">Type</ttcol>
    <ttcol align='left' width="33%">TLV Name</ttcol>
    <ttcol align='left' width="69%">Reference</ttcol>
    <ttcol align='left' width="69%">Comment</ttcol>

    <c>0</c>
    <c>Reserved</c>
    <c><xref target="RFC7555"/></c>
    <c></c>

    <c>1</c>
    <c>EQ</c>
    <c>EQ</c>
    <c>EQ</c>

    <c>2-31739</c>
    <c>Unassigned</c>
    <c></c>
    <c></c>

    <c>31740-31743</c>
    <c>Experimental Use</c>
    <c>This Document</c>
    <c>Reserved, not Assignments</name>
            <thead>
              <tr>
                <th align="left">Sub-Type</th>
                <th align="left">Sub-TLV Name</th>
                <th align="left">Reference</th>
                <th align="left">Comment</th>
              </tr>
            </thead>
            <tbody>
              <tr>
                <td align="left">0</td>
                <td align="left">Reserved</td>
                <td align="left">
                  <xref target="RFC7555" format="default"/></td>
                <td align="left"/>
              </tr>
              <tr>
                <td align="left">1</td>
                <td align="left">EQ</td>
                <td align="left">EQ</td>
                <td align="left">EQ</td>
              </tr>
              <tr>
                <td align="left">2-31739</td>
                <td align="left">Unassigned</td>
                <td align="left"/>
                <td align="left"/>
              </tr>
              <tr>
                <td align="left">31740-31743</td>
                <td align="left">Reserved for Experimental Use</td>
                <td align="left">This document</td>
                <td align="left">Not to be assigned. This range is for sub-TLVs that require an error message if not recognized. [This This document, section 3.1]</c>

    <c>31744-64507</c>
    <c>Unassigned</c>
    <c></c>
    <c></c>

    <c>64508-64511</c>
    <c>Experimental Use</c>
    <c>This document</c>
    <c>Reserved, not <xref target="principles"/>]</td>
              </tr>
              <tr>
                <td align="left">31744-64507</td>
                <td align="left">Unassigned</td>
                <td align="left"/>
                <td align="left"/>
              </tr>
              <tr>
                <td align="left">64508-64511</td>
                <td align="left">Reserved for Experimental Use</td>
                <td align="left">This document</td>
                <td align="left">Not to be assigned. This range is for TLVs sub-TLVs that can be silently dropped if not recognized.</c>

    <c>64512-65535</c>
    <c>Unassigned</c>
    <c></c>
    <c></c>

               </texttable> recognized.</td>
              </tr>
              <tr>
                <td align="left">64512-65535</td>
                <td align="left">Unassigned</td>
                <td align="left"/>
                <td align="left"/>
              </tr>
            </tbody>
          </table>
        </section>
        <section anchor="upds-sub-tlv-27" title="Updates numbered="true" toc="default">
          <name>Updates to the registry Registry for Sub-TLVs for TLV 27"> Type 27</name>
          <t>

  This section describes the new registration procedures and the assignments
  for the "<xref target="IANA-Sub-27" format="title" />" format="title"/>" <xref target="IANA-Sub-27"/>
  sub-registry target="IANA-Sub-27" format="default"/>
  subregistry that are based on the new registration
  procedures. them.
          </t>

  <t>
  <list style="symbols">
  <t>
          <ul spacing="normal">
            <li>
  The "Specification Required" registration procedure has been changed to "RFC
  Required", and the comment "Experimental RFC Required" has been removed.
  </t>

  <t>
  </li>
            <li>
  The code points registration procedure "Vendor Private Use" has been removed
  and replaced with "First
  Come,
  Come First Served" code points.
  </t>

  <t>
  </li>
            <li>
  Two small sets, 4 four code points each, have been created for Experimental Use.
  </t>

  <t>
  </li>
            <li>
  Code points that are reserved are clearly marked as such.
  </t>

  <t>
  </li>
            <li>
  The assignments have been updated to match the new registration procedures.

  </t>

  <t>

  </li>
            <li>
  The notes related to the registration procedures have been changed to reflect
  whether or not a response is required or not if a sub-TLV is not recognized.
  </t>

  </list>

  </t>
  </li>
          </ul>
          <t>
  The registration procedures for the "<xref target="IANA-Sub-27" format="title" />" format="title"/>"
  <xref target="IANA-Sub-27"/> sub-registry will now look like this: target="IANA-Sub-27" format="default"/> subregistry after the changes listed above are shown in the table below:

          </t>

   <texttable title="Registration
          <table anchor="sub-tlv-27-reg-proc" align="center">
            <name>Registration Procedures for Sub-TLVs for TLV 27" anchor="sub-tlv-27-reg-proc">
    <ttcol align='left' width="8%">Range</ttcol>
    <ttcol align='left' width="33%">Registration Procedures</ttcol>
    <ttcol align='left' width="69%">Note</ttcol>

    <c>0-16383</c>
    <c>Standards Action</c>
    <c>This Type 27</name>
            <thead>
              <tr>
                <th align="left">Range</th>
                <th align="left">Registration Procedures</th>
                <th align="left">Note</th>
              </tr>
            </thead>
            <tbody>
              <tr>
                <td align="left">0-16383</td>
                <td align="left">Standards Action</td>
                <td align="left">This range is for sub-TLVs that require an error message if not recognized. [This This document, section 3.1]</c>

    <c>16384-31739</c>
    <c>RFC Required</c>
    <c>This <xref target="principles"/>]</td>
              </tr>
              <tr>
                <td align="left">16384-31739</td>
                <td align="left">RFC Required</td>
                <td align="left">This range is for sub-TLVs that require an error message if not recognized. [This This document, section 3.1]</c>

    <c>31740-31743</c>
    <c>Experimental Use</c>
    <c>Reserved, not <xref target="principles"/>]</td>
              </tr>
              <tr>
                <td align="left">31740-31743</td>
                <td align="left">Reserved for Experimental Use</td>
                <td align="left">Not to be assigned. This range is for sub-TLVs that require an error message if not recognized. [This This document, section 3.1]</c>

    <c>31744-32767</c>
    <c>FCFS</c>
    <c>This <xref target="principles"/>]</td>
              </tr>
              <tr>
                <td align="left">31744-32767</td>
                <td align="left">FCFS</td>
                <td align="left">This range is for sub-TLVs that require an error message if not recognized. [This This document, section 3.1]</c>

    <c>32768-49161</c>
    <c>Standards Action</c>
    <c>This <xref target="principles"/>]</td>
              </tr>
              <tr>
                <td align="left">32768-49161</td>
                <td align="left">Standards Action</td>
                <td align="left">This range is for sub-TLVs that can be silently dropped if not recognized.</c>

    <c>49162-64507</c>
    <c>RFC Required</c>
    <c>This recognized.</td>
              </tr>
              <tr>
                <td align="left">49162-64507</td>
                <td align="left">RFC Required</td>
                <td align="left">This range is for sub-TLVs that can be silently dropped if not recognized.</c>

    <c>64508-64511</c>
    <c>Experimental Use</c>
    <c>Reserved, recognized.</td>
              </tr>
              <tr>
                <td align="left">64508-64511</td>
                <td align="left">Experimental Use</td>
                <td align="left">Reserved, not to be assigned. This range is for TLVs sub-TLVs that can be silently dropped if not recognized.</c>

    <c>64512-65535</c>
    <c>FCFS</c>
    <c>This recognized.</td>
              </tr>
              <tr>
                <td align="left">64512-65535</td>
                <td align="left">FCFS</td>
                <td align="left">This range is for sub-TLVs that can be silently dropped if not recognized.</c>

    </texttable>

    <texttable title="Sub-TLVs recognized.</td>
              </tr>
            </tbody>
          </table>

          <table anchor="sub-tlv-27-assign" align="center">
            <name>Sub-TLVs for TLV Type 27 Assignments" anchor="sub-tlv-27-assign">
    <ttcol align='left' width="8%">Type</ttcol>
    <ttcol align='left' width="33%">TLV Name</ttcol>
    <ttcol align='left' width="69%">Reference</ttcol>
    <ttcol align='left' width="69%">Comment</ttcol>

    <c>0</c>
    <c>Reserved</c>
    <c><xref target="RFC7759"/></c>
    <c></c>

    <c>1-99</c>
    <c>Unassigned</c>
    <c></c>
    <c></c>

    <c>100-104</c>
    <c>EQ</c>
    <c>EQ</c>
    <c>EQ</c>

    <c>105-199</c>
    <c>Unassigned</c>
    <c></c>
    <c></c>

    <c>200-202</c>
    <c>EQ</c>
    <c>EQ</c>
    <c>EQ</c>

    <c>203-299</c>
    <c>Unassigned</c>
    <c></c>
    <c></c>

    <c>300</c>
    <c>EQ</c>
    <c>EQ</c>
    <c>EQ</c>

    <c>301-399</c>
    <c>Unassigned</c>
    <c></c>
    <c></c>

    <c>400</c>
    <c>EQ</c>
    <c>EQ</c>
    <c>EQ</c>

    <c>401-31739</c>
    <c>Unassigned</c>
    <c></c>
    <c></c>

    <c>31740-31743</c>
    <c>Experimental Use</c>
    <c>This Document</c>
    <c>Reserved, not Assignments</name>
            <thead>
              <tr>
                <th align="left">Sub-Type</th>
                <th align="left">Sub-TLV Name</th>
                <th align="left">Reference</th>
                <th align="left">Comment</th>
              </tr>
            </thead>
            <tbody>
              <tr>
                <td align="left">0</td>
                <td align="left">Reserved</td>
                <td align="left">
                  <xref target="RFC7759" format="default"/></td>
                <td align="left"/>
              </tr>
              <tr>
                <td align="left">1-99</td>
                <td align="left">Unassigned</td>
                <td align="left"/>
                <td align="left"/>
              </tr>
              <tr>
                <td align="left">100-104</td>
                <td align="left">EQ</td>
                <td align="left">EQ</td>
                <td align="left">EQ</td>
              </tr>
              <tr>
                <td align="left">105-199</td>
                <td align="left">Unassigned</td>
                <td align="left"/>
                <td align="left"/>
              </tr>
              <tr>
                <td align="left">200-202</td>
                <td align="left">EQ</td>
                <td align="left">EQ</td>
                <td align="left">EQ</td>
              </tr>
              <tr>
                <td align="left">203-299</td>
                <td align="left">Unassigned</td>
                <td align="left"/>
                <td align="left"/>
              </tr>
              <tr>
                <td align="left">300</td>
                <td align="left">EQ</td>
                <td align="left">EQ</td>
                <td align="left">EQ</td>
              </tr>
              <tr>
                <td align="left">301-399</td>
                <td align="left">Unassigned</td>
                <td align="left"/>
                <td align="left"/>
              </tr>
              <tr>
                <td align="left">400</td>
                <td align="left">EQ</td>
                <td align="left">EQ</td>
                <td align="left">EQ</td>
              </tr>
              <tr>
                <td align="left">401-31739</td>
                <td align="left">Unassigned</td>
                <td align="left"/>
                <td align="left"/>
              </tr>
              <tr>
                <td align="left">31740-31743</td>
                <td align="left">Reserved for Experimental Use</td>
                <td align="left">This document</td>
                <td align="left">Not to be assigned. This range is for sub-TLVs that require an error message if not recognized. [This This document, section 3.1]</c>

    <c>31744-64507</c>
    <c>Unassigned</c>
    <c></c>
    <c></c>

    <c>64508-64511</c>
    <c>Experimental Use</c>
    <c>This document</c>
    <c>Reserved, not <xref target="principles"/>]</td>
              </tr>
              <tr>
                <td align="left">31744-64507</td>
                <td align="left">Unassigned</td>
                <td align="left"/>
                <td align="left"/>
              </tr>
              <tr>
                <td align="left">64508-64511</td>
                <td align="left">Reserved for Experimental Use</td>
                <td align="left">This document</td>
                <td align="left">Not to be assigned. This range is for TLVs sub-TLVs that can be silently dropped if not recognized.</c>

    <c>64512-65535</c>
    <c>Unassigned</c>
    <c></c>
    <c></c>

               </texttable> recognized.</td>
              </tr>
              <tr>
                <td align="left">64512-65535</td>
                <td align="left">Unassigned</td>
                <td align="left"/>
                <td align="left"/>
              </tr>
            </tbody>
          </table>
        </section>
      </section>
    </section>

    <section anchor="Acknowledgements" title="Acknowledgements">
    <t>
     The authors wish to thank Adrian Farrel, who both made very useful
     comments and agreed to serve as the document shepherd.
    </t>

    <t>
    The authors also wish to thank Michelle Cotton and Amanda Baber who very
    patiently worked
    with us to determine how our registries could and should be updated.
    </t>

    <t>
    The authors thanks Donald Eastlake and Tom Petch for careful and detailed
    reviews.
    </t>

    </section>
  </middle>
  <back>

    <references title="Normative References">

      <?rfc include="reference.RFC.2119"?>
      <?rfc include="reference.RFC.8029"?>
      <?rfc include="reference.RFC.8126"?>
      <?rfc include="reference.RFC.8174"?>
      <?rfc include="reference.RFC.8611"?>
    <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.8029.xml"/>
        <xi:include href="https://xml2rfc.ietf.org/public/rfc/bibxml/reference.RFC.8126.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.8611.xml"/>

        <reference anchor="IANA-LSP-PING" target="https://www.iana.org/assignments/mpls-lsp-ping-parameters/mpls-lsp-ping-parameters.xhtml/"> target="https://www.iana.org/assignments/mpls-lsp-ping-parameters">
          <front>
            <title>Multiprotocol Label Switching (MPLS) Label Switched Paths (LSPs) Ping Parameters</title>
            <author/>
            <date/>
          </front>
        </reference>

        <reference anchor="IANA-MT" target="https://www.iana.org/assignments/mpls-lsp-ping-parameters/mpls-lsp-ping-parameters.xhtml#message-types"> target="https://www.iana.org/assignments/mpls-lsp-ping-parameters/">
          <front>
            <title>Message Types</title>
            <author/>
            <date/>
          </front>
        </reference>

        <reference anchor="IANA-RM" target="https://www.iana.org/assignments/mpls-lsp-ping-parameters/#reply-modes"> target="https://www.iana.org/assignments/mpls-lsp-ping-parameters/">
          <front>
            <title>Reply Modes</title>
            <author/>
            <date/>
          </front>
        </reference>

        <reference anchor="IANA-RC" target="https://www.iana.org/assignments/mpls-lsp-ping-parameters/#return-codes"> target="https://www.iana.org/assignments/mpls-lsp-ping-parameters/">
          <front>
            <title>Return Codes</title>
            <author/>
            <date/>
          </front>
        </reference>

        <reference anchor="IANA-TLV-reg" target="https://www.iana.org/assignments/mpls-lsp-ping-parameters/mpls-lsp-ping-parameters.xhtml#tlvs"> target="https://www.iana.org/assignments/mpls-lsp-ping-parameters/">
          <front>
            <title>TLVs</title>
            <author/>
            <date/>
          </front>
        </reference>

        <reference anchor="IANA-Sub-1-16-21" target="https://www.iana.org/assignments/mpls-lsp-ping-parameters/mpls-lsp-ping-parameters.xhtml#sub-tlv-1-16-21"> target="https://www.iana.org/assignments/mpls-lsp-ping-parameters/">
          <front>
            <title>Sub-TLVs for TLV Types 1, 16, and 21</title>
            <author/>
            <date/>
          </front>
        </reference>

        <reference anchor="IANA-Sub-6" target="https://www.iana.org/assignments/mpls-lsp-ping-parameters/mpls-lsp-ping-parameters.xhtml#sub-tlv-6"> target="https://www.iana.org/assignments/mpls-lsp-ping-parameters/">
          <front>
            <title>Sub-TLVs for TLV Type 6</title>
            <author/>
            <date/>
          </front>
        </reference>

        <reference anchor="IANA-Sub-11" target="https://www.iana.org/assignments/mpls-lsp-ping-parameters/mpls-lsp-ping-parameters.xhtml#sub-tlv-11"> target="https://www.iana.org/assignments/mpls-lsp-ping-parameters/">
          <front>
            <title>Sub-TLVs for TLV Type 11</title>
            <author/>
            <date/>
          </front>
        </reference>

        <reference anchor="IANA-Sub-20" target="https://www.iana.org/assignments/mpls-lsp-ping-parameters/mpls-lsp-ping-parameters.xhtml#sub-tlv-20"> target="https://www.iana.org/assignments/mpls-lsp-ping-parameters/">
          <front>
            <title>Sub-TLVs for TLV Type 20</title>
            <author/>
            <date/>
          </front>
        </reference>

        <reference anchor="IANA-Sub-23" target="https://www.iana.org/assignments/mpls-lsp-ping-parameters/mpls-lsp-ping-parameters.xhtml#sub-tlv-23"> target="https://www.iana.org/assignments/mpls-lsp-ping-parameters/">
          <front>
            <title>Sub-TLVs for TLV Type 23</title>
            <author/>
            <date/>
          </front>
        </reference>

        <reference anchor="IANA-Sub-27" target="https://www.iana.org/assignments/mpls-lsp-ping-parameters/mpls-lsp-ping-parameters.xhtml#sub-tlv-27"> target="https://www.iana.org/assignments/mpls-lsp-ping-parameters/">
          <front>
            <title>Sub-TLVs for TLV Type 27</title>
            <author/>
            <date/>
          </front>
        </reference>
      </references>

    <references title="Informative References">
    <!--
       <?rfc include="reference.RFC.7759"?>
    -->
       <?rfc include="reference.RFC.7110"?>
       <?rfc include="reference.RFC.7555"?>
       <?rfc include="reference.RFC.7743"?>
       <?rfc include="reference.RFC.7759"?>
       <?rfc include="reference.RFC.8287"?>
      <references>
        <name>Informative References</name>
        <xi:include href="https://xml2rfc.ietf.org/public/rfc/bibxml/reference.RFC.7110.xml"/>
        <xi:include href="https://xml2rfc.ietf.org/public/rfc/bibxml/reference.RFC.7555.xml"/>
        <xi:include href="https://xml2rfc.ietf.org/public/rfc/bibxml/reference.RFC.7743.xml"/>
        <xi:include href="https://xml2rfc.ietf.org/public/rfc/bibxml/reference.RFC.7759.xml"/>
        <xi:include href="https://xml2rfc.ietf.org/public/rfc/bibxml/reference.RFC.8287.xml"/>

        <reference anchor="IANA-Sub-9" target="https://www.iana.org/assignments/mpls-lsp-ping-parameters/mpls-lsp-ping-parameters.xhtml#sub-tlv-9"> target="https://www.iana.org/assignments/mpls-lsp-ping-parameters/">
          <front>
            <title>Sub-TLVs for TLV Type 9</title>
            <author/>
            <date/>
          </front>
        </reference>

        <reference anchor="lsp-ping-Namespace" target="https://www.iana.org/assignments/mpls-lsp-ping-parameters/mpls-lsp-ping-parameters.xhtml"> target="https://www.iana.org/assignments/mpls-lsp-ping-parameters/">
          <front>
            <title>Multiprotocol Label Switching (MPLS) Label Switched Paths (LSPs) Ping Parameters</title>
            <author/>
            <date/>
          </front>
        </reference>
      </references>
    </references>
    <section anchor="Acknowledgements" numbered="false" toc="default">
      <name>Acknowledgements</name>
      <t>
     The authors wish to thank <contact fullname="Adrian Farrel"/>, who both made very useful
     comments and agreed to serve as the Document Shepherd.
      </t>
      <t>
    The authors also wish to thank <contact fullname="Michelle Cotton"/> and <contact fullname="Amanda Baber"/>, who very
    patiently worked
    with us to determine how our registries could and should be updated.
      </t>
      <t>
    The authors thank <contact fullname="Donald Eastlake 3rd"/> and <contact fullname="Tom Petch"/> for their careful and detailed
    review.
      </t>
    </section>
  </back>
</rfc>