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<rfc xmlns:xi="http://www.w3.org/2001/XInclude" ipr="trust200902" docName="draft-ietf-mpls-mna-requirements-16" number="9613" updates="" obsoletes="" category="info" submissionType="IETF" consensus="true" tocInclude="true" sortRefs="true" symRefs="true" version="3">
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  <front>
    <title abbrev="MNA Requirements">Requirements for Solutions that Support MPLS Network Actions (MNA)</title> (MNAs)</title>
    <seriesInfo name="Internet-Draft" value="draft-ietf-mpls-mna-requirements-16"/> name="RFC" value="9613"/>
    <author initials="M." surname="Bocci" fullname="Matthew Bocci" role="editor">
      <organization>Nokia</organization>
      <address>
        <email>matthew.bocci@nokia.com</email>
      </address>
    </author>
    <author initials="S." surname="Bryant" fullname="Stewart Bryant">
      <organization>University of Surrey ISC</organization>
      <address>
        <email>sb@stewartbryant.com</email>
      </address>
    </author>
    <author initials="J." surname="Drake" fullname="John Drake">
      <organization>Independent</organization>
      <address>
        <email>je_drake@yahoo.com</email>
      </address>
    </author>
    <date year="2024" month="May" day="30"/>
    <workgroup>MPLS Working Group</workgroup> month="July"/>
    <area>RTG</area>
    <workgroup>mpls</workgroup>

<keyword>Network Action</keyword>
<keyword>NA</keyword>
<keyword>Network Action indicator</keyword>
<keyword>NAI</keyword>
<keyword>Ancillary Data</keyword>
<keyword>AD</keyword>

    <abstract>
      <?line 53?>
<t>This document specifies requirements for the development of MPLS Network Actions (MNA) which (MNAs) that affect the forwarding
or other processing of MPLS packets. These requirements are informed by a number of
proposals for additions to the MPLS information in the labeled packet
 to allow such actions to be performed, either by a transit or terminating Label Switching Router
 (i.e., the Label Edge Router - LER).</t>
    </abstract>
  </front>
  <middle>
    <?line 63?>

<section anchor="introduction">
      <name>Introduction</name>
      <t>There is significant interest in developing the MPLS data plane to
address the requirements of new use cases <xref target="I-D.ietf-mpls-mna-usecases"/>. This requires a
general mechanism, termed MPLS Network Actions (MNA), (MNAs), to allow the network to make a forwarding or
processing decision based on information other than the top label and Traffic Class (TC) bits, and to
also make use of the Network Action Indicator and ancillary data (MNA information).
These use cases require the definition of extensions to the MPLS architecture and label
stack label-stack operations that can be used across these use cases in order to minimize implementation
complexity and promote interoperability and extensibility. These protocol extensions need
to conform to with the existing MPLS architecture as specified by <xref target="RFC3031"/>, <xref target="RFC3032"/>, and <xref target="RFC6790"/>.</t>
      <t>Note that the MPLS architecture specified in <xref target="RFC3031"/> describes a mechanism for forwarding
MPLS packets through a network without requiring any analysis of the MPLS packet payload's
network layer header by intermediate nodes (Label Switching Routers - LSRs).  Formally,
inspection may only occur at network ingress (the Label Edge Router - LER) where the MPLS
packet is assigned to a Forwarding Equivalence Class (FEC).</t>

      <t>This document specifies the requirements for solutions that encode MPLS Network Actions MNAs
and ancillary data that may be needed by the processing of to process those actions.
   These requirements are informed by a
   number of proposals for to allow additions to the MPLS information in the
   labeled packet
to allow so that such actions to can be performed, either by a
   transit or terminating LSR. It is
anticipated that these will result in two types of solution specification:</t>
      <ol spacing="normal" type="1"><li>
          <t>A specifications:</t>

      <dl spacing="normal">
          <dt>MNA solution:</dt><dd>A specification that describes a common protocol that supports all forms of MPLS Network Actions.
This is referred to as the MNA Solution.</t>
        </li>
        <li>
          <t>One Actions.</dd>
          <dt>Network Action solutions:</dt><dd>One or more specifications describing the protocol extensions, and utilising (1), extensions for network action(s) the MNA solution to realise address a use case. These are referred to as Network Action solutions.</t>
        </li>
      </ol> case.</dd>
      </dl>
      <t>The term 'solutions', in isolation, refers to both MNA and Network Action solutions.
The requirements constrain the MNA solution design to enable interoperability between implementations.</t>
      <section anchor="terminology">
        <name>Terminology</name>
        <ul

        <dl spacing="normal">
          <li>
            <t>Network Action:
            <dt>Network Action (NA):</dt><dd> An operation to be performed on an MPLS packet or as a consequence of an MPLS packet
being processed by a router.  A network action may
affect router state, state or MPLS packet forwarding, or it may affect the MPLS packet in some other way.</t>
          </li>
          <li>
            <t>Network way.</dd>
            <dt>Network Action Indicator (NAI): An (NAI):</dt><dd>An indication in the MPLS packet that a certain network action
is to be performed.</t>
          </li>
          <li>
            <t>Ancillary performed.</dd>

            <dt>Ancillary Data (AD): (AD):</dt><dd><t>
Data in an MPLS packet associated with a
      given network action that may be used as input to the processing of process
      the network action or results may result from the processing
of the
      network action.  Ancillary data may be associated with:
            </t> action.</t>

            <ul spacing="normal">
              <li>
                <t>Both the control or maintenance information and the data traffic carried by the Label Switched Path (LSP).</t>
              </li>
              <li>
                <t>Only the control or maintenance information.</t>
              </li>
              <li>
                <t>Only the data traffic carried by the LSP.</t>
              </li>
            </ul>
          </li>
          <li>
            <t>In-Stack Data: Ancillary
	  </dd>
            <dt>In-Stack Data:</dt><dd>Ancillary data carried within the MPLS label stack.</t>
          </li>
          <li>
            <t>Post-Stack Data: Ancillary stack.</dd>
            <dt>Post-Stack Data:</dt><dd>Ancillary data carried in an MPLS packet between the bottom of the MPLS label
stack and the first octet of the user payload.  This document does not prescribe whether
post-stack data precedes or follows any other post-stack header such as a Control Word or
Associated Channel Header (ACH).</t>
          </li>
          <li>
            <t>Scope: (ACH).</dd>
            <dt>Scope:</dt><dd> The set of nodes that should perform a given action.</t>
          </li>
        </ul> action.</dd>
	</dl>
      </section>
    </section>
    <section anchor="requirements-language">
      <name>Requirements Language</name>
      <t>The
        <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> here.
        </t>

      <t>Although this document is not a protocol specification, this convention is adopted
for clarity of description of requirements.</t>
    </section>
    <section anchor="mpls-network-action-requirements">
      <name>MPLS Network Action Requirements</name>

      <t>This document specifies requirements on MPLS network actions Network Actions and the technology to support
them in MPLS, such as the Network Action Indicators (NAIs), NAIs, the associated ancillary data (AD), AD, and the alert mechanism
to indicate to an LSR that NAIs are present in an MPLS packet.</t>
      <t>The requirements are for the behavior of the protocol mechanisms and procedures that constitute building blocks
out of which indicators for network actions and associated ancillary data are constructed.<br/> constructed.
It does not specify the detailed actions and processing of any network actions or ancillary
data by an LSR or LER.</t>

      <t>The size of the ancillary data carried post-stack end-to-end end to end in an MPLS packet is a matter for
agreement between the ingress and egress PEs, provider edges (PEs), and is not part of these requirements.
Since in-stack ancillary data and per-hop post-stack data need to be parsed and processed
by transit LSRs along the LSP, Label Switched Path (LSP), requirements on the size of such ancillary data are documented in the following sections.</t>
      <section anchor="general-requirements">
        <name>General Requirements</name>
        <ol spacing="normal" type="1" start="1"><li>
            <t>Any MNA and Network Action solution MUST solutions <bcp14>MUST</bcp14> maintain the properties of extensibility,
flexibility, and efficiency inherent in the split between the control plane context and simple
data plane used in MPLS, MPLS and SHOULD <bcp14>SHOULD</bcp14> describe how this is achieved.</t>
          </li>
          <li>
            <t>Any solutions to these requirements MUST <bcp14>MUST</bcp14> be based on and MUST NOT <bcp14>MUST NOT</bcp14> restrict the
generality of the MPLS architecture <xref target="RFC3031"/>, target="RFC3031"/> <xref target="RFC3032"/> and <xref target="RFC5331"/>.</t>
          </li>
          <li>
            <t>If
<!-- [rfced] For clarity, can this be made into a positive statement?

Original:
   3.   If extensions to the MPLS data plane are required, they MUST NOT
        be inconsistent with the MPLS architecture [RFC3031], [RFC3032]
        and [RFC5331].

Suggested:
   3.   If extensions to the MPLS data plane are required, they MUST
        be consistent with the MPLS architecture [RFC3031] [RFC3032]
        [RFC5331].
-->
          <li>
            <t>If extensions to the MPLS data plane are required, they <bcp14>MUST NOT</bcp14> be inconsistent
with the MPLS architecture <xref target="RFC3031"/>, <xref target="RFC3032"/> and <xref target="RFC5331"/>.</t>
          </li>
          <li>
            <t>Solutions meeting the requirements set out in this document MUST <bcp14>MUST</bcp14> be able to coexist
with existing MPLS mechanisms.</t>
          </li>
          <li>
            <t>Subject to the constraints in these requirements requirements, a Network Action solution MAY <bcp14>MAY</bcp14> carry MNA
information in-stack, post-stack post-stack, or both in-stack and post-stack.</t>
          </li>
          <li>
            <t>Solutions MUST NOT <bcp14>MUST NOT</bcp14> require an implementation to support in-stack ancillary data,
unless the implementation chooses to support a network action that uses in-stack ancillary data.</t>
          </li>
          <li>
            <t>Solutions MUST NOT <bcp14>MUST NOT</bcp14> require an implementation to support post-stack ancillary data,
unless the implementation chooses to support a network action that uses post-stack ancillary data.</t>
          </li>
          <li>
            <t>The design of any MNA solution MUST <bcp14>MUST</bcp14> minimize the amount of processing required to parse
the label stack at an LSR.</t>
          </li>
          <li>
            <t>Solutions MUST <bcp14>MUST</bcp14> minimize any additions to the size of the MPLS label stack.</t>
          </li>
          <li>
            <t>Solutions that increase the size of the MPLS label stack in a way that is not
controlled by the ingress LER MUST <bcp14>MUST</bcp14> discuss the consequences.</t>
          </li>
          <li>
            <t>Solution specifications MUST <bcp14>MUST</bcp14> discuss the ECMP consequences of the design.</t>
          </li>
          <li>
            <t>A network action Network Action solution MUST NOT <bcp14>MUST NOT</bcp14> expose information to the LSRs that is not already exposed to the LER.</t>
          </li>
          <li>
            <t>The design of any network action MUST NOT <bcp14>MUST NOT</bcp14> expose any information that a user of any service using the LSP considers
confidential <xref target="RFC6973"/> <xref target="RFC3552"/>.</t>
          </li>
          <li>
            <t>Solution specifications MUST <bcp14>MUST</bcp14> document any new security considerations that they
introduce.</t>
          </li>
          <li>
            <t>An MNA solution MUST <bcp14>MUST</bcp14> allow MPLS packets carrying NAI and ancillary data (where it exists) to coexist
with MPLS packets that do not carry this information on the same LSP.</t>
          </li>
        </ol>
      </section>
      <section anchor="requirements-on-the-mna-alert-mechanism">
        <name>Requirements on the MNA Alert Mechanism</name>
        <ol spacing="normal" type="1" start="16"><li>
            <t>An MNA solution MUST <bcp14>MUST</bcp14> define how a node determines whether NAIs are present in the MPLS packet.</t>
          </li>
          <li>
            <t>Special Purpose Labels (SPLs) are a mechanism of last resort, and therefore resort; therefore, an MNA solution
that uses them MUST <bcp14>MUST</bcp14> minimize the number of new SPLs that are allocated.</t>
          </li>
        </ol>
      </section>
      <section anchor="requirements-on-network-actions">
        <name>Requirements on Network Actions</name>
        <ol spacing="normal" type="1" start="18"><li>
            <t>It is RECOMMENDED <bcp14>RECOMMENDED</bcp14> that an MNA specification solution support network actions for
private use (See Section 4.1 of
Private Use (see <xref target="RFC8126"/>).</t> target="RFC8126" sectionFormat="of" section="4.1"/>).</t>
          </li>
          <li>
            <t>Network action specifications MUST Action solutions <bcp14>MUST</bcp14> specify if the network action needs to
be processed as a part of the immediate forwarding operation and whether MPLS packet
mis-ordering
misordering is allowed to occur as a result of the time taken to process the network action.</t>
          </li>
          <li>
            <t>If a network action Network Action solution allows more than one scope for a network action, it MUST <bcp14>MUST</bcp14> provide a mechanism to specify the precedence
of the scopes or any combination of the scopes.</t>
          </li>
          <li>
            <t>If a Network Action (NA) network action requires an NAI with in-stack ancillary data that needs to be imposed at an LSR
 on an LSP, then the network action Network Action solution specification MUST <bcp14>MUST</bcp14> specify how this is achieved in all circumstances.</t>
          </li>
          <li>
            <t>If a network action requires an NAI with post-stack ancillary data to be imposed at an LSR
on an LSP, then the network action Network Action solution specification MUST <bcp14>MUST</bcp14> specify how this is achieved in all circumstances.</t>
          </li>
        </ol>
      </section>
      <section anchor="requirements-on-network-action-indicators">
        <name>Requirements on Network Action Indicators</name>
        <ol spacing="normal" type="1" start="23"><li>
            <t>Insertion, parsing, processing processing, and disposition of NAIs SHOULD <bcp14>SHOULD</bcp14> make use of existing MPLS
data plane operations.</t>
          </li>
          <li>
            <t>Without constraining the mechanism, an MNA solution MUST <bcp14>MUST</bcp14> enable a node inserting or modifying NAIs
 to determine if the target of the NAI, or any other LSR that may expose the NAI, can accept
 and process an MPLS packet containing the NAI.</t>
          </li>
          <li>
            <t>An NAI MUST NOT <bcp14>MUST NOT</bcp14> be imposed for delivery to a node unless it is known that the node
supports processing the NAI.</t>
          </li>
          <li>
            <t>The NAI design MUST <bcp14>MUST</bcp14> support setting the scope of network actions.</t>
          </li>
          <li>
            <t>A given network action specification MUST Network Action solution <bcp14>MUST</bcp14> specify which scope or scopes are applicable to the associated NAI.</t>
          </li>
          <li>
            <t>An MNA solution SHOULD <bcp14>SHOULD</bcp14> support NAIs for both Point-to-Point (P2P) and Point-to-Multipoint (P2MP) paths, but the Network
        Action solution <bcp14>MAY</bcp14> limit a specific NAI MAY
be limited by the network action specification to only one or the other
        of these path types if there is a clear reason to
        do so.</t>
          </li>
          <li>
            <t>An MNA solution defining data plane mechanisms for NAIs MUST <bcp14>MUST</bcp14> be consistent across different control
plane protocols.</t>
          </li>
          <li>
            <t>An MNA solution MUST <bcp14>MUST</bcp14> allow the deployed MPLS control and management planes to determine the ability of downstream LSRs
to accept and/or process a given NAI.</t>
          </li>
          <li>
            <t>An MNA solution MUST <bcp14>MUST</bcp14> allow indicators for multiple network actions in the same MPLS<br/> MPLS
packet.</t>
          </li>
          <li>
            <t>An MNA solution MUST NOT <bcp14>MUST NOT</bcp14> require an implementation to process all NAIs present in an MPLS packet.</t>
          </li>
          <li>
            <t>NAIs MUST <bcp14>MUST</bcp14> only be inserted at LSRs that push a label onto the stack, but they can be processed by
LSRs along the path of the LSP. Two examples of LSRs that push a label onto the stack are head end head-end LSRs
and points of local repair (PLRs).</t>
          </li>
          <li>
            <t>If an NA a network action requires in-stack ancillary data, the NAI that indicates this NA MUST network action <bcp14>MUST</bcp14> be
present in the label stack.</t>
          </li>
          <li>
            <t>All NAIs MUST <bcp14>MUST</bcp14> be encoded in a manner consistent with <xref target="RFC3031"/></t> target="RFC3031"/>.</t>
          </li>
          <li>
            <t>If there is post-stack ancillary data for an NAI that is present in the label stack,
 it MUST <bcp14>MUST</bcp14> be possible to infer the presence of the ancillary data without having to parse below the bottom of the label stack.</t>
          </li>
          <li>
            <t>Any processing that removes an NAI from the label stack MUST <bcp14>MUST</bcp14> also remove all associated
ancillary data from the MPLS packet unless the ancillary data is required by any remaining NAIs.</t>
          </li>
          <li>
            <t>MNA solution specifications MUST solutions <bcp14>MUST</bcp14> request that IANA to create registries and make allocations from those registries for NAIs
as necessary to ensure unambiguous identification of standardized NAs. network actions. An MNA solution MAY <bcp14>MAY</bcp14> request that IANA to reserve a range
of a registry for private use.</t> Private Use.</t>
          </li>
          <li>
            <t>A network action Network Action solution specification MUST <bcp14>MUST</bcp14> state where the NAIs are to be placed in the MPLS
packet, that is whether they are placed in-stack or post-stack.</t>
          </li>
        </ol>
      </section>
      <section anchor="requirements-on-ancillary-data">
        <name>Requirements on Ancillary Data</name>
        <ol spacing="normal" type="1" start="40"><li>
            <t>Network action specifications MUST Action solutions <bcp14>MUST</bcp14> specify whether ancillary data is
required to fulfil fulfill the action and whether it is in-stack and/or post-stack.</t>
          </li>
          <li>
            <t>Network action specifications MUST Action solutions <bcp14>MUST</bcp14> specify if in-stack or post-stack ancillary data that is
already present in the MPLS packet MAY <bcp14>MAY</bcp14> be rewritten by an LSR.</t>
          </li>
          <li>
            <t>Solutions for in-stack ancillary data MUST <bcp14>MUST</bcp14> be able to coexist with and
MUST NOT
<bcp14>MUST NOT</bcp14> obsolete existing MPLS mechanisms. Such solutions MUST <bcp14>MUST</bcp14> be described in a Standards
Track RFC.</t>
          </li>
          <li>
            <t>Network action Action solutions MUST <bcp14>MUST</bcp14> take care to limit the quantity of in-stack ancillary data to the minimum amount required.</t>
          </li>
          <li>
            <t>A network action Network Action solution SHOULD NOT <bcp14>SHOULD NOT</bcp14> use post-stack ancillary data unless the size of that ancillary data if it was inserted into
the label stack
        could prevent the coexistence of the
        network action with other in-use MPLS network functions.</t> functions if it
        were inserted into the label stack.
	    </t>
          </li>
          <li>
            <t>The structure of the NAI and any associated ancillary data MUST <bcp14>MUST</bcp14> enable skipping of
unknown NAIs and any associated AD.</t>
          </li>
          <li>
            <t>Any MNA solution specification MUST <bcp14>MUST</bcp14> describe whether it can coexist with existing post-stack data
mechanisms (e.g., control words and the Generic Associated Channel Header), and if so how this coexistence operates.</t>
          </li>
          <li>
            <t>An MNA solution MUST <bcp14>MUST</bcp14> allow an LER that inserts ancillary data to determine
whether each node that needs to process the ancillary data can read the required distance into the
MPLS packet at that node (compare with the mechanism in <xref target="RFC9088"/>).</t>
          </li>
          <li>
            <t>For scoped in-stack or post-stack ancillary data, any MNA solution MUST <bcp14>MUST</bcp14> allow an LER inserting NAIs whose
network actions make use of that ancillary data to determine if the NAI and ancillary data
will be processed by LSRs within the scope along the path.
Such a solution may need to determine if LSRs along the path can process a specific type
of AD implied by the NAI at the depth in the stack that it will be presented to the LSR.</t>
          </li>
          <li>
            <t>A mechanism MUST <bcp14>MUST</bcp14> exist to notify an egress LER of the presence of ancillary data so
that it can dispose of it appropriately.</t>
          </li>
          <li>
            <t>In-stack ancillary data MUST <bcp14>MUST</bcp14> only be inserted in conjunction with an operation conforming
to
with <xref target="RFC3031"/>.</t>
          </li>
          <li>
            <t>Post-stack ancillary data MUST <bcp14>MUST</bcp14> only be inserted in conjunction with an operation conforming
to
with <xref target="RFC3031"/>.</t>
          </li>
          <li>
            <t>Processing of ancillary data below a swapped label MAY <bcp14>MAY</bcp14> include rewriting the ancillary data.</t>
          </li>
          <li>
            <t>A network action Network Action solution that needs to change the size of the ancillary data MUST <bcp14>MUST</bcp14> analyze the
implications on MPLS packet forwarding and specify how these are addressed.</t>
          </li>
          <li>
            <t>Not more than one standards track Standards Track solution SHOULD <bcp14>SHOULD</bcp14> be defined for encoding in-stack ancillary data.</t>
          </li>
          <li>
            <t>Not more than one standards track Standards Track solution SHOULD <bcp14>SHOULD</bcp14> be defined for encoding post-stack ancillary data.</t>
          </li>
        </ol>
      </section>
    </section>
    <section anchor="iana-considerations">
      <name>IANA Considerations</name>
      <t>This document makes has no request of IANA.</t>
      <t>Note to RFC Editor: this section may be removed on publication as an
RFC.</t> IANA actions.</t>
    </section>
    <section anchor="security-considerations">
      <name>Security Considerations</name>
      <t>Solutions designed according to the requirements in this document may introduce new security
considerations to MPLS, whose forwarding plane on its own does not provide any built-in
security mechanisms <xref target="RFC5920"/>.</t>
      <t>In particular, such solutions may embed information derived from the MPLS payload
in the MPLS headers. This may expose data that a user of the MPLS-based service might otherwise
assume is opaque to the MPLS network. Furthermore, an LSR may insert information
into the labeled packet such that the forwarding behavior is no longer purely a function of the top label
or another label with forwarding context. Instead, the forwarding behavior may be the result of a more complex heuristic.
This creates an implicit trust relationship between the LSR whose forwarding behavior is being changed
and the upstream LSR inserting the data causing that change.</t>
      <t>Several requirements above address some of these considerations. The MNA framework <xref target="I-D.ietf-mpls-mna-fwk"/>
also provides security considerations resulting from any extensions to the MPLS architecture, and these SHOULD <bcp14>SHOULD</bcp14> be taken
together with the security considerations herein.</t>
      <t>Individual solution specifications meeting the requirements in this document MUST <bcp14>MUST</bcp14> address any
security considerations introduced by the MNA design.</t>
    </section>
    <section anchor="acknowledgements">
      <name>Acknowledgements</name>
      <t>The authors gratefully acknowledge the contributions from Joel Halpern, Greg Mirsky, Yingzhen Qu, Haoyu Song,
Tarek Saad, Loa Andersson, Tony Li, Adrian Farrel, Jie Dong and Bruno Decraene, <contact fullname="Joel Halpern"/>, <contact fullname="Greg Mirsky"/>, <contact fullname="Yingzhen Qu"/>, <contact fullname="Haoyu Song"/>,
<contact fullname="Tarek Saad"/>, <contact fullname="Loa Andersson"/>, <contact fullname="Tony Li"/>, <contact fullname="Adrian Farrel"/>, <contact fullname="Jie Dong"/>, <contact fullname="Bruno Decraene"/>, and participants in the
MPLS working group Working Group who have provided comments.</t>
      <t>The authors also gratefully acknowledge the input of the members of the
MPLS Open Design Team.</t>
    </section>
  </middle>
  <back>
    <displayreference target="I-D.ietf-mpls-mna-usecases" to="MNA-USECASES"/>
    <displayreference target="I-D.ietf-mpls-mna-fwk" to="MNA-FRAMEWORK"/>
    <references>
      <name>References</name>
      <references anchor="sec-normative-references">
        <name>Normative References</name>
        <reference anchor="RFC2119">
          <front>
            <title>Key words for use in RFCs to Indicate Requirement Levels</title>
            <author fullname="S. Bradner" initials="S." surname="Bradner"/>
            <date month="March" year="1997"/>
            <abstract>
              <t>In many standards track documents several words are used to signify the requirements in the specification. These words are often capitalized. This document defines these words as they should be interpreted in IETF documents. This document specifies an Internet Best Current Practices for the Internet Community, and requests discussion and suggestions for improvements.</t>
            </abstract>
          </front>
          <seriesInfo name="BCP" value="14"/>
          <seriesInfo name="RFC" value="2119"/>
          <seriesInfo name="DOI" value="10.17487/RFC2119"/>
        </reference>
        <reference anchor="RFC8174">
          <front>
            <title>Ambiguity of Uppercase vs Lowercase in RFC 2119 Key Words</title>
            <author fullname="B. Leiba" initials="B." surname="Leiba"/>
            <date month="May" year="2017"/>
            <abstract>
              <t>RFC 2119 specifies common key words that may be used in protocol specifications. This document aims to reduce the ambiguity by clarifying that only UPPERCASE usage of the key words have the defined special meanings.</t>
            </abstract>
          </front>
          <seriesInfo name="BCP" value="14"/>
          <seriesInfo name="RFC" value="8174"/>
          <seriesInfo name="DOI" value="10.17487/RFC8174"/>
        </reference>
        <reference anchor="RFC3031">
          <front>
            <title>Multiprotocol Label Switching Architecture</title>
            <author fullname="E. Rosen" initials="E." surname="Rosen"/>
            <author fullname="A. Viswanathan" initials="A." surname="Viswanathan"/>
            <author fullname="R. Callon" initials="R." surname="Callon"/>
            <date month="January" year="2001"/>
            <abstract>
              <t>This document specifies the architecture for Multiprotocol Label Switching (MPLS). [STANDARDS-TRACK]</t>
            </abstract>
          </front>
          <seriesInfo name="RFC" value="3031"/>
          <seriesInfo name="DOI" value="10.17487/RFC3031"/>
        </reference>
        <reference anchor="RFC3032">
          <front>
            <title>MPLS Label Stack Encoding</title>
            <author fullname="E. Rosen" initials="E." surname="Rosen"/>
            <author fullname="D. Tappan" initials="D." surname="Tappan"/>
            <author fullname="G. Fedorkow" initials="G." surname="Fedorkow"/>
            <author fullname="Y. Rekhter" initials="Y." surname="Rekhter"/>
            <author fullname="D. Farinacci" initials="D." surname="Farinacci"/>
            <author fullname="T. Li" initials="T." surname="Li"/>
            <author fullname="A. Conta" initials="A." surname="Conta"/>
            <date month="January" year="2001"/>
            <abstract>
              <t>This document specifies the encoding to be used by an LSR in order to transmit labeled packets on Point-to-Point Protocol (PPP) data links, on LAN data links, and possibly on other data links as well. This document also specifies rules and procedures for processing the various fields of the label stack encoding. [STANDARDS-TRACK]</t>
            </abstract>
          </front>
          <seriesInfo name="RFC" value="3032"/>
          <seriesInfo name="DOI" value="10.17487/RFC3032"/>
        </reference>
        <reference anchor="RFC5331">
          <front>
            <title>MPLS Upstream Label Assignment and Context-Specific Label Space</title>
            <author fullname="R. Aggarwal" initials="R." surname="Aggarwal"/>
            <author fullname="Y. Rekhter" initials="Y." surname="Rekhter"/>
            <author fullname="E. Rosen" initials="E." surname="Rosen"/>
            <date month="August" year="2008"/>
            <abstract>
              <t>RFC 3031 limits the MPLS architecture to downstream-assigned MPLS labels. This document introduces the notion of upstream-assigned MPLS labels. It describes the procedures for upstream MPLS label assignment and introduces the concept of a "Context-Specific Label Space". [STANDARDS-TRACK]</t>
            </abstract>
          </front>
          <seriesInfo name="RFC" value="5331"/>
          <seriesInfo name="DOI" value="10.17487/RFC5331"/>
        </reference>
        <reference anchor="RFC8126">
          <front>
            <title>Guidelines for Writing an IANA Considerations Section in RFCs</title>
            <author fullname="M. Cotton" initials="M." surname="Cotton"/>
            <author fullname="B. Leiba" initials="B." surname="Leiba"/>
            <author fullname="T. Narten" initials="T." surname="Narten"/>
            <date month="June" year="2017"/>
            <abstract>
              <t>Many protocols make use of points of extensibility that use constants to identify various protocol parameters. To ensure that the values in these fields do not have conflicting uses and to promote interoperability, their allocations are often coordinated by a central record keeper. For IETF protocols, that role is filled by the Internet Assigned Numbers Authority (IANA).</t>
              <t>To make assignments in a given registry prudently, guidance describing the conditions under which new values should be assigned, as well as when and how modifications to existing values can be made, is needed. This document defines a framework for the documentation of these guidelines by specification authors, in order to assure that the provided guidance for the IANA Considerations is clear and addresses the various issues that are likely in the operation of a registry.</t>
              <t>This is the third edition of this document; it obsoletes RFC 5226.</t>
            </abstract>
          </front>
          <seriesInfo name="BCP" value="26"/>
          <seriesInfo name="RFC" value="8126"/>
          <seriesInfo name="DOI" value="10.17487/RFC8126"/>
        </reference>

	<xi:include href="https://bib.ietf.org/public/rfc/bibxml/reference.RFC.2119.xml"/>
	<xi:include href="https://bib.ietf.org/public/rfc/bibxml/reference.RFC.8174.xml"/>
	<xi:include href="https://bib.ietf.org/public/rfc/bibxml/reference.RFC.3031.xml"/>
	<xi:include href="https://bib.ietf.org/public/rfc/bibxml/reference.RFC.3032.xml"/>
	<xi:include href="https://bib.ietf.org/public/rfc/bibxml/reference.RFC.5331.xml"/>
	<xi:include href="https://bib.ietf.org/public/rfc/bibxml/reference.RFC.8126.xml"/>

      </references>
      <references anchor="sec-informative-references">
        <name>Informative References</name>
        <reference anchor="I-D.ietf-mpls-mna-usecases">
          <front>
            <title>Use Cases for MPLS Network Action Indicators and MPLS Ancillary Data</title>
            <author fullname="Tarek Saad" initials="T." surname="Saad">
              <organization>Cisco Systems, Inc.</organization>
            </author>
            <author fullname="Kiran Makhijani" initials="K." surname="Makhijani">
              <organization>Futurewei Technologies</organization>
            </author>
            <author fullname="Haoyu Song" initials="H." surname="Song">
              <organization>Futurewei Technologies</organization>
            </author>
            <author fullname="Greg Mirsky" initials="G." surname="Mirsky">
              <organization>Ericsson</organization>
            </author>
            <date day="20" month="May" year="2024"/>
            <abstract>
              <t>   This document presents use cases that have a common feature in that
   they may be addressed by encoding network action indicators and
   associated ancillary data within MPLS packets.  There are interest in
   extending the MPLS data plane to carry such indicators and ancillary
   data to address the use cases that are described in this document.

   The use cases described in this document are not an exhaustive set,
   but rather the ones that are actively discussed by members of the
   IETF MPLS, PALS, and DetNet working groups.

              </t>
            </abstract>
          </front>
          <seriesInfo name="Internet-Draft" value="draft-ietf-mpls-mna-usecases-07"/>
        </reference>
        <reference anchor="I-D.ietf-mpls-mna-fwk">
          <front>
            <title>MPLS Network Actions (MNA) Framework</title>
            <author fullname="Loa Andersson" initials="L." surname="Andersson">
              <organization>Huawei Technologies</organization>
            </author>
            <author fullname="Stewart Bryant" initials="S." surname="Bryant">
              <organization>University of Surrey 5GIC</organization>
            </author>
            <author fullname="Matthew Bocci" initials="M." surname="Bocci">
              <organization>Nokia</organization>
            </author>
            <author fullname="Tony Li" initials="T." surname="Li">
              <organization>Juniper Networks</organization>
            </author>
            <date day="7" month="May" year="2024"/>
            <abstract>
              <t>   This document specifies an architectural framework for the MPLS
   Network Actions (MNA) technologies.  MNA technologies are used to
   indicate actions that impact the forwarding or other processing (such

<!-- [I-D.ietf-mpls-mna-usecases] IESG state: I-D Exists as monitoring) of the packet along the Label Switched Path (LSP) of
   the packet and to transfer any additional data needed for these
   actions.

   The document provides the foundation for the development of a common
   set of network actions and information elements supporting additional
   operational models and capabilities of MPLS networks.  Some of these
   actions are defined in existing MPLS specifications, while others
   require extensions to existing specifications to meet the
   requirements found in "Requirements for MPLS Network Actions".

              </t>
            </abstract>
          </front>
          <seriesInfo name="Internet-Draft" value="draft-ietf-mpls-mna-fwk-08"/>
        </reference>
        <reference anchor="RFC5920">
          <front>
            <title>Security Framework for MPLS and GMPLS Networks</title>
            <author fullname="L. Fang" initials="L." role="editor" surname="Fang"/>
            <date month="July" year="2010"/>
            <abstract>
              <t>This document provides a security framework for Multiprotocol Label Switching (MPLS) and Generalized Multiprotocol Label Switching (GMPLS) Networks. This document addresses the security aspects that are relevant in the context of MPLS and GMPLS. It describes the security threats, the related defensive techniques, and the mechanisms for detection and reporting. This document emphasizes RSVP-TE and LDP security considerations, as well 06/05/24 -->
        <xi:include href="https://datatracker.ietf.org/doc/bibxml3/draft-ietf-mpls-mna-usecases.xml"/>

<!-- [I-D.ietf-mpls-mna-fwk] IESG state: I-D Exists as inter-AS and inter-provider security considerations for building and maintaining MPLS and GMPLS networks across different domains or different Service Providers. This document is not an Internet Standards Track specification; it is published for informational purposes.</t>
            </abstract>
          </front>
          <seriesInfo name="RFC" value="5920"/>
          <seriesInfo name="DOI" value="10.17487/RFC5920"/>
        </reference>
        <reference anchor="RFC6790">
          <front>
            <title>The Use of Entropy Labels in MPLS Forwarding</title>
            <author fullname="K. Kompella" initials="K." surname="Kompella"/>
            <author fullname="J. Drake" initials="J." surname="Drake"/>
            <author fullname="S. Amante" initials="S." surname="Amante"/>
            <author fullname="W. Henderickx" initials="W." surname="Henderickx"/>
            <author fullname="L. Yong" initials="L." surname="Yong"/>
            <date month="November" year="2012"/>
            <abstract>
              <t>Load balancing is a powerful tool for engineering traffic across a network. This memo suggests ways of improving load balancing across MPLS networks using the concept of "entropy labels". It defines the concept, describes why entropy labels are useful, enumerates properties of entropy labels that allow maximal benefit, and shows how they can be signaled and used for various applications. This document updates RFCs 3031, 3107, 3209, and 5036. [STANDARDS-TRACK]</t>
            </abstract>
          </front>
          <seriesInfo name="RFC" value="6790"/>
          <seriesInfo name="DOI" value="10.17487/RFC6790"/>
        </reference>
        <reference anchor="RFC6973">
          <front>
            <title>Privacy Considerations for Internet Protocols</title>
            <author fullname="A. Cooper" initials="A." surname="Cooper"/>
            <author fullname="H. Tschofenig" initials="H." surname="Tschofenig"/>
            <author fullname="B. Aboba" initials="B." surname="Aboba"/>
            <author fullname="J. Peterson" initials="J." surname="Peterson"/>
            <author fullname="J. Morris" initials="J." surname="Morris"/>
            <author fullname="M. Hansen" initials="M." surname="Hansen"/>
            <author fullname="R. Smith" initials="R." surname="Smith"/>
            <date month="July" year="2013"/>
            <abstract>
              <t>This document offers guidance for developing privacy considerations for inclusion in protocol specifications. It aims to make designers, implementers, and users of Internet protocols aware of privacy-related design choices. It suggests that whether any individual RFC warrants a specific privacy considerations section will depend on the document's content.</t>
            </abstract>
          </front>
          <seriesInfo name="RFC" value="6973"/>
          <seriesInfo name="DOI" value="10.17487/RFC6973"/>
        </reference>
        <reference anchor="RFC3552">
          <front>
            <title>Guidelines for Writing RFC Text on Security Considerations</title>
            <author fullname="E. Rescorla" initials="E." surname="Rescorla"/>
            <author fullname="B. Korver" initials="B." surname="Korver"/>
            <date month="July" year="2003"/>
            <abstract>
              <t>All RFCs are required to have a Security Considerations section. Historically, such sections have been relatively weak. This document provides guidelines to RFC authors on how to write a good Security Considerations section. This document specifies an Internet Best Current Practices for the Internet Community, and requests discussion and suggestions for improvements.</t>
            </abstract>
          </front>
          <seriesInfo name="BCP" value="72"/>
          <seriesInfo name="RFC" value="3552"/>
          <seriesInfo name="DOI" value="10.17487/RFC3552"/>
        </reference>
        <reference anchor="RFC9088">
          <front>
            <title>Signaling Entropy Label Capability and Entropy Readable Label Depth Using IS-IS</title>
            <author fullname="X. Xu" initials="X." surname="Xu"/>
            <author fullname="S. Kini" initials="S." surname="Kini"/>
            <author fullname="P. Psenak" initials="P." surname="Psenak"/>
            <author fullname="C. Filsfils" initials="C." surname="Filsfils"/>
            <author fullname="S. Litkowski" initials="S." surname="Litkowski"/>
            <author fullname="M. Bocci" initials="M." surname="Bocci"/>
            <date month="August" year="2021"/>
            <abstract>
              <t>Multiprotocol Label Switching (MPLS) has defined a mechanism to load-balance traffic flows using Entropy Labels (EL). An ingress Label Switching Router (LSR) cannot insert ELs for packets going into a given Label Switched Path (LSP) unless an egress LSR has indicated via signaling that it has the capability to process ELs, referred to as the Entropy Label Capability (ELC), on that LSP. In addition, it would be useful for ingress LSRs to know each LSR's capability for reading the maximum label stack depth and performing EL-based load-balancing, referred to as Entropy Readable Label Depth (ERLD). This document defines a mechanism to signal these two capabilities using IS-IS and Border Gateway Protocol - Link State (BGP-LS).</t>
            </abstract>
          </front>
          <seriesInfo name="RFC" value="9088"/>
          <seriesInfo name="DOI" value="10.17487/RFC9088"/>
        </reference> 06/05/24 -->
        <xi:include href="https://datatracker.ietf.org/doc/bibxml3/draft-ietf-mpls-mna-fwk.xml"/>

	<xi:include href="https://bib.ietf.org/public/rfc/bibxml/reference.RFC.5920.xml"/>
	<xi:include href="https://bib.ietf.org/public/rfc/bibxml/reference.RFC.6790.xml"/>
	<xi:include href="https://bib.ietf.org/public/rfc/bibxml/reference.RFC.6973.xml"/>
	<xi:include href="https://bib.ietf.org/public/rfc/bibxml/reference.RFC.3552.xml"/>
	<xi:include href="https://bib.ietf.org/public/rfc/bibxml/reference.RFC.9088.xml"/>

      </references>
    </references>
    <?line 368?>
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