Update to the IANA PCE Communication Protocol (PCEP) Registration Procedures and Allowing Experimental Error Codes
draft-ietf-pce-iana-update-03
| Document | Type | Active Internet-Draft (pce WG) | |
|---|---|---|---|
| Authors | Dhruv Dhody , Adrian Farrel | ||
| Last updated | 2024-11-12 | ||
| Replaces | draft-dhody-pce-iana-update, draft-farrel-pce-experimental-errors | ||
| RFC stream | Internet Engineering Task Force (IETF) | ||
| Intended RFC status | Proposed Standard | ||
| Formats | |||
| Reviews | |||
| Additional resources | Mailing list discussion | ||
| Stream | WG state | Submitted to IESG for Publication | |
| Document shepherd | Julien Meuric | ||
| Shepherd write-up | Show Last changed 2024-10-07 | ||
| IESG | IESG state | IESG Evaluation | |
| Action Holder | |||
| Consensus boilerplate | Yes | ||
| Telechat date |
On agenda of 2024-12-05 IESG telechat
Needs 8 more YES or NO OBJECTION positions to pass. |
||
| Responsible AD | John Scudder | ||
| Send notices to | [email protected] | ||
| IANA | IANA review state | Version Changed - Review Needed |
draft-ietf-pce-iana-update-03
Path Computation Element D. Dhody
Internet-Draft Huawei
Updates: 5440, 8231, 8233, 8281, 8623, 8664, A. Farrel
8685, 8697, 8745, 8733, 8779, 8780, Old Dog Consulting
8800, 8934, 9050, 9059, 9168, 9357, 12 November 2024
9504, 9603, 9604 (if approved)
Intended status: Standards Track
Expires: 16 May 2025
Update to the IANA PCE Communication Protocol (PCEP) Registration
Procedures and Allowing Experimental Error Codes
draft-ietf-pce-iana-update-03
Abstract
This document updates the registration procedure within the IANA
"Path Computation Element Protocol (PCEP) Numbers" group of
registries. This specification changes some of the registries with
Standards Action to IETF Review as defined in RFC 8126. This memo
updates RFCs 8231, 8233, 8281, 8623, 8664, 8685, 8697, 8733, 8745,
8779, 8780, 8800, 8934, 9050, 9059, 9168, 9357, 9504, 9603, and 9604
for the same.
Designating "experimental use" sub-ranges within code point
registries is often beneficial for protocol experimentation in
controlled environments. Although the registries for PCEP messages,
objects, and TLV types have sub-ranges assigned for Experimental Use,
the registry for PCEP Error-Types and Error-values currently does
not. This document updates RFC 5440 by designating a specific range
of PCEP Error-Types for Experimental Use.
Discussion Venues
This note is to be removed before publishing as an RFC.
Discussion of this document takes place on the Path Computation
Element Working Group mailing list ([email protected]), which is archived
at https://mailarchive.ietf.org/arch/browse/pce/.
Source for this draft and an issue tracker can be found at
https://github.com/ietf-wg-pce/draft-ietf-pce-iana-update.
Status of This Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
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Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet-
Drafts is at https://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
This Internet-Draft will expire on 16 May 2025.
Copyright Notice
Copyright (c) 2024 IETF Trust and the persons identified as the
document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents (https://trustee.ietf.org/
license-info) in effect on the date of publication of this document.
Please review these documents carefully, as they describe your rights
and restrictions with respect to this document. Code Components
extracted from this document must include Revised BSD License text as
described in Section 4.e of the Trust Legal Provisions and are
provided without warranty as described in the Revised BSD License.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Standards Action PCEP Registries Affected . . . . . . . . . . 3
3. Experimental Error-Types . . . . . . . . . . . . . . . . . . 5
3.1. Advice on Experimentation . . . . . . . . . . . . . . . . 6
3.2. Handling of Unknown Experimentation . . . . . . . . . . . 7
4. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 7
5. Security Considerations . . . . . . . . . . . . . . . . . . . 7
6. References . . . . . . . . . . . . . . . . . . . . . . . . . 8
6.1. Normative References . . . . . . . . . . . . . . . . . . 8
6.2. Informative References . . . . . . . . . . . . . . . . . 11
Appendix A. Acknowledgments . . . . . . . . . . . . . . . . . . 11
Appendix B. Rationale for updating all registries with Standards
Action . . . . . . . . . . . . . . . . . . . . . . . . . 11
Appendix C. Consideration of RFC 8356 . . . . . . . . . . . . . 12
Appendix D. Contributor . . . . . . . . . . . . . . . . . . . . 12
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 12
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1. Introduction
The IANA "Path Computation Element Protocol (PCEP) Numbers" registry
group was populated by several RFCs produced by the Path Computation
Element (PCE) working group. Most of the registries include the
"IETF Review" [RFC8126] as registration procedures. There are a few
registries that use "Standards Action". Thus, the values in those
registries can be assigned only through the Standards Track or Best
Current Practice RFCs in the IETF Stream. This memo changes the
policy from Standards Action to IETF Review to allow any type of RFC
under the IETF stream to make the allocation request.
Further, in Section 9 of [RFC5440], IANA assigns values to the PCEP
parameters. The allocation policy for each of these parameters
specified in RFC 5440 is IETF Review [RFC8126]. In consideration of
the benefits of conducting experiments with PCEP and the utility of
experimental codepoints [RFC3692], codepoint ranges for PCEP
messages, objects, and TLV types for Experimental Use [RFC8126] are
designated in [RFC8356]. However, protocol experiments may also need
to return protocol error messages indicating experiment-specific
error cases. It will often be the case that previously assigned
error codes (in the PCEP-ERROR Object Error Types and Values sub-
registry) can be used to indicate the error cases within an
experiment, but there may also be cases where new, experimental error
codes are needed. In order to run experiments, it is important that
the codepoint values used in the experiments do not collide with
existing codepoints or any future allocations. This document updates
[RFC5440] by changing the allocation policy for the registry of PCEP
Error-Types to mark some of the codepoints as assigned for
Experimental Use. As stated in [RFC3692], experiments using these
codepoints are not intended to be used in general deployments, and
due care must be taken to ensure that two experiments using the same
codepoints are not run in the same environment.
2. Standards Action PCEP Registries Affected
The following table lists the "Path Computation Element Protocol
(PCEP) Numbers" registries whose registration policy will be changed
from Standards Action to IETF Review. Affected registries will list
this document as a reference. Where this change is applied to a
specific range of values within the particular registry, that range
is given in the Remarks column.
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+========================================+===========+=========+
| Registry | RFC | Remarks |
+========================================+===========+=========+
| BU Object Type Field | [RFC8233] | |
+----------------------------------------+-----------+---------+
| LSP Object Flag Field | [RFC8231] | |
+----------------------------------------+-----------+---------+
| STATEFUL-PCE-CAPABILITY TLV Flag Field | [RFC8231] | |
+----------------------------------------+-----------+---------+
| LSP-ERROR-CODE TLV Error Code Field | [RFC8231] | |
+----------------------------------------+-----------+---------+
| SRP Object Flag Field | [RFC8281] | |
+----------------------------------------+-----------+---------+
| SR-ERO Flag Field | [RFC8664] | |
+----------------------------------------+-----------+---------+
| PATH-SETUP-TYPE-CAPABILITY Sub-TLV | [RFC8664] | |
| Type Indicators | | |
+----------------------------------------+-----------+---------+
| SR Capability Flag Field | [RFC8664] | |
+----------------------------------------+-----------+---------+
| WA Object Flag Field | [RFC8780] | |
+----------------------------------------+-----------+---------+
| Wavelength Restriction TLV Action | [RFC8780] | |
| Values | | |
+----------------------------------------+-----------+---------+
| Wavelength Allocation TLV Flag Field | [RFC8780] | |
+----------------------------------------+-----------+---------+
| S2LS Object Flag Field | [RFC8623] | |
+----------------------------------------+-----------+---------+
| H-PCE-CAPABILITY TLV Flag Field | [RFC8685] | |
+----------------------------------------+-----------+---------+
| H-PCE-FLAG TLV Flag Field | [RFC8685] | |
+----------------------------------------+-----------+---------+
| ASSOCIATION Flag Field | [RFC8697] | |
+----------------------------------------+-----------+---------+
| ASSOCIATION Type Field | [RFC8697] | |
+----------------------------------------+-----------+---------+
| AUTO-BANDWIDTH-CAPABILITY TLV Flag | [RFC8733] | |
| Field | | |
+----------------------------------------+-----------+---------+
| Path Protection Association Group TLV | [RFC8745] | |
| Flag Field | | |
+----------------------------------------+-----------+---------+
| Generalized Endpoint Types | [RFC8779] | 0-244 |
+----------------------------------------+-----------+---------+
| GMPLS-CAPABILITY TLV Flag Field | [RFC8779] | |
+----------------------------------------+-----------+---------+
| DISJOINTNESS-CONFIGURATION TLV Flag | [RFC8800] | |
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| Field | | |
+----------------------------------------+-----------+---------+
| SCHED-PD-LSP-ATTRIBUTE TLV Opt Field | [RFC8934] | |
+----------------------------------------+-----------+---------+
| Schedule TLVs Flag Field | [RFC8934] | |
+----------------------------------------+-----------+---------+
| FLOWSPEC Object Flag Field | [RFC9168] | |
+----------------------------------------+-----------+---------+
| Bidirectional LSP Association Group | [RFC9059] | |
| TLV Flag Field | | |
+----------------------------------------+-----------+---------+
| PCECC-CAPABILITY sub-TLV | [RFC9050] | |
+----------------------------------------+-----------+---------+
| CCI Object Flag Field for MPLS Label | [RFC9050] | |
+----------------------------------------+-----------+---------+
| TE-PATH-BINDING TLV BT Field | [RFC9050] | |
+----------------------------------------+-----------+---------+
| TE-PATH-BINDING TLV Flag Field | [RFC9604] | |
+----------------------------------------+-----------+---------+
| LSP-EXTENDED-FLAG TLV Flag Field | [RFC9357] | |
+----------------------------------------+-----------+---------+
| LSP Exclusion Subobject Flag Field | [RFC9504] | |
+----------------------------------------+-----------+---------+
| SRv6-ERO Flag Field | [RFC9603] | |
+----------------------------------------+-----------+---------+
| SRv6 Capability Flag Field | [RFC9603] | |
+----------------------------------------+-----------+---------+
Table 1: PCEP Registries Affected
Future registries in the "Path Computation Element Protocol (PCEP)
Numbers" registry group should prefer to use "IETF Review" over
"Standards Action".
3. Experimental Error-Types
This document requests IANA for the designation of four PCEP Error-
Type codepoints (252-255) for Experimental Use.
IANA maintains a registry group called "Path Computation Element
Protocol (PCEP) Numbers" with a registry named "PCEP-ERROR Object
Error Types and Values". IANA is requested to change the assignment
policy for this registry to read:
* Error-Types
- 0-251 : IETF Review
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- 252-255 : Experimental Use
* Error-value
- For all IETF Review Error-Types : IETF Review
- For all Experimental Use Error-Types : Experimental Use
Additionally, IANA is requested to make an entry in the table as
follows:
+============+==================+==================+===========+
| Error-Type | Meaning | Error-value | Reference |
+============+==================+==================+===========+
| 252-255 | Experimental Use | 0-255 | This I-D |
| | | Experimental Use | |
+------------+------------------+------------------+-----------+
Table 2
3.1. Advice on Experimentation
An experiment that wishes to return experimental error codes should
use one of the experimental Error-Type values as defined in this
document. The experiment should agree, between all participating
parties, on which Error-Type to use and which Error-values to use
within that Error-Type. The experiment will describe what the
meanings of those Error-Type / Error-value pairs are. Those Error-
Type and Error-values should not be recorded in any public
(especially any IETF) documentation. Textual or symbolic names for
the Error-Types and Error-values may be used to help keep the
documentation clear.
If multiple experiments are taking place at the same time using the
same implementations, care must be taken to keep the sets of Error-
Type / Error-value distinct.
Note that there is no scope for experimental Error-values within
existing non-experimental Error-Types. This reduces the complexity
of the registry and implementations. Experiments should place all
experimental Error-values under the chosen experimental Error-Types.
If, at some future time, the experiment is declared a success and
moved to IETF work targeting publication on the Standards Track, each
pair of Error-Type / Error-value will need to be assigned by IANA
from the registry. In some cases, this will involve assigning a new
Error-Type with its subtended Error-values. In other cases, use may
be made of an existing Error-Type with new subtended Error-values
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being assigned. The resulting change to code in an implementation is
as simple as changing the numeric values of the Error-Types and
Error-values.
3.2. Handling of Unknown Experimentation
A PCEP implementation that receives an experimental Error-Type in a
PCEP message and does not recognize the Error-Type (i.e., is not part
of the experiment) will treat the error as it would treat any other
unknown Error-Type (such as from a new protocol extension). An
implementation that is notified of a PCEP error will normally close
the PCEP session (see [RFC5440]). In general, PCEP implementations
are not required to take specific action based on Error-Types but may
log the errors for diagnostic purposes.
An implementation that is part of an experiment may receive an
experimental Error-Type, but not recognize the Error-value. This
could happen because of any of:
* A faulty implementation.
* Two implementations not being synchronized with respect to which
Error-values to use in the experiment.
* More than one experiment being run at the same time.
As with unknown Error-Types, an implementation receiving an unknown
Error-value is not expected to do more than log the received error
and may close the PCEP session.
4. IANA Considerations
This memo is entirely about updating the IANA "Path Computation
Element Protocol (PCEP) Numbers" registry.
5. Security Considerations
This memo does not change the Security Considerations for any of the
updated RFCs. Refer to [RFC5440] and [I-D.ietf-pce-pceps-tls13] for
further details of the specific security measures applicable to PCEP.
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[RFC3692] asserts that the existence of experimental codepoints
introduces no new security considerations. However, implementations
accepting experimental error codepoints need to consider how they
parse and process them in case they come, accidentally, from another
experiment. Further, an implementation accepting experimental
codepoints needs to consider the security aspects of the experimental
extensions. [RFC6709] provides various design considerations for
protocol extensions (including those designated as experimental).
6. References
6.1. Normative References
[RFC5440] Vasseur, JP., Ed. and JL. Le Roux, Ed., "Path Computation
Element (PCE) Communication Protocol (PCEP)", RFC 5440,
DOI 10.17487/RFC5440, March 2009,
<https://www.rfc-editor.org/rfc/rfc5440>.
[RFC8126] Cotton, M., Leiba, B., and T. Narten, "Guidelines for
Writing an IANA Considerations Section in RFCs", BCP 26,
RFC 8126, DOI 10.17487/RFC8126, June 2017,
<https://www.rfc-editor.org/rfc/rfc8126>.
[RFC8231] Crabbe, E., Minei, I., Medved, J., and R. Varga, "Path
Computation Element Communication Protocol (PCEP)
Extensions for Stateful PCE", RFC 8231,
DOI 10.17487/RFC8231, September 2017,
<https://www.rfc-editor.org/rfc/rfc8231>.
[RFC8233] Dhody, D., Wu, Q., Manral, V., Ali, Z., and K. Kumaki,
"Extensions to the Path Computation Element Communication
Protocol (PCEP) to Compute Service-Aware Label Switched
Paths (LSPs)", RFC 8233, DOI 10.17487/RFC8233, September
2017, <https://www.rfc-editor.org/rfc/rfc8233>.
[RFC8281] Crabbe, E., Minei, I., Sivabalan, S., and R. Varga, "Path
Computation Element Communication Protocol (PCEP)
Extensions for PCE-Initiated LSP Setup in a Stateful PCE
Model", RFC 8281, DOI 10.17487/RFC8281, December 2017,
<https://www.rfc-editor.org/rfc/rfc8281>.
[RFC8356] Dhody, D., King, D., and A. Farrel, "Experimental
Codepoint Allocation for the Path Computation Element
Communication Protocol (PCEP)", RFC 8356,
DOI 10.17487/RFC8356, March 2018,
<https://www.rfc-editor.org/rfc/rfc8356>.
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[RFC8623] Palle, U., Dhody, D., Tanaka, Y., and V. Beeram, "Stateful
Path Computation Element (PCE) Protocol Extensions for
Usage with Point-to-Multipoint TE Label Switched Paths
(LSPs)", RFC 8623, DOI 10.17487/RFC8623, June 2019,
<https://www.rfc-editor.org/rfc/rfc8623>.
[RFC8664] Sivabalan, S., Filsfils, C., Tantsura, J., Henderickx, W.,
and J. Hardwick, "Path Computation Element Communication
Protocol (PCEP) Extensions for Segment Routing", RFC 8664,
DOI 10.17487/RFC8664, December 2019,
<https://www.rfc-editor.org/rfc/rfc8664>.
[RFC8685] Zhang, F., Zhao, Q., Gonzalez de Dios, O., Casellas, R.,
and D. King, "Path Computation Element Communication
Protocol (PCEP) Extensions for the Hierarchical Path
Computation Element (H-PCE) Architecture", RFC 8685,
DOI 10.17487/RFC8685, December 2019,
<https://www.rfc-editor.org/rfc/rfc8685>.
[RFC8697] Minei, I., Crabbe, E., Sivabalan, S., Ananthakrishnan, H.,
Dhody, D., and Y. Tanaka, "Path Computation Element
Communication Protocol (PCEP) Extensions for Establishing
Relationships between Sets of Label Switched Paths
(LSPs)", RFC 8697, DOI 10.17487/RFC8697, January 2020,
<https://www.rfc-editor.org/rfc/rfc8697>.
[RFC8733] Dhody, D., Ed., Gandhi, R., Ed., Palle, U., Singh, R., and
L. Fang, "Path Computation Element Communication Protocol
(PCEP) Extensions for MPLS-TE Label Switched Path (LSP)
Auto-Bandwidth Adjustment with Stateful PCE", RFC 8733,
DOI 10.17487/RFC8733, February 2020,
<https://www.rfc-editor.org/rfc/rfc8733>.
[RFC8745] Ananthakrishnan, H., Sivabalan, S., Barth, C., Minei, I.,
and M. Negi, "Path Computation Element Communication
Protocol (PCEP) Extensions for Associating Working and
Protection Label Switched Paths (LSPs) with Stateful PCE",
RFC 8745, DOI 10.17487/RFC8745, March 2020,
<https://www.rfc-editor.org/rfc/rfc8745>.
[RFC8779] Margaria, C., Ed., Gonzalez de Dios, O., Ed., and F.
Zhang, Ed., "Path Computation Element Communication
Protocol (PCEP) Extensions for GMPLS", RFC 8779,
DOI 10.17487/RFC8779, July 2020,
<https://www.rfc-editor.org/rfc/rfc8779>.
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[RFC8780] Lee, Y., Ed. and R. Casellas, Ed., "The Path Computation
Element Communication Protocol (PCEP) Extension for
Wavelength Switched Optical Network (WSON) Routing and
Wavelength Assignment (RWA)", RFC 8780,
DOI 10.17487/RFC8780, July 2020,
<https://www.rfc-editor.org/rfc/rfc8780>.
[RFC8800] Litkowski, S., Sivabalan, S., Barth, C., and M. Negi,
"Path Computation Element Communication Protocol (PCEP)
Extension for Label Switched Path (LSP) Diversity
Constraint Signaling", RFC 8800, DOI 10.17487/RFC8800,
July 2020, <https://www.rfc-editor.org/rfc/rfc8800>.
[RFC8934] Chen, H., Ed., Zhuang, Y., Ed., Wu, Q., and D. Ceccarelli,
"PCE Communication Protocol (PCEP) Extensions for Label
Switched Path (LSP) Scheduling with Stateful PCE",
RFC 8934, DOI 10.17487/RFC8934, October 2020,
<https://www.rfc-editor.org/rfc/rfc8934>.
[RFC9050] Li, Z., Peng, S., Negi, M., Zhao, Q., and C. Zhou, "Path
Computation Element Communication Protocol (PCEP)
Procedures and Extensions for Using the PCE as a Central
Controller (PCECC) of LSPs", RFC 9050,
DOI 10.17487/RFC9050, July 2021,
<https://www.rfc-editor.org/rfc/rfc9050>.
[RFC9059] Gandhi, R., Ed., Barth, C., and B. Wen, "Path Computation
Element Communication Protocol (PCEP) Extensions for
Associated Bidirectional Label Switched Paths (LSPs)",
RFC 9059, DOI 10.17487/RFC9059, June 2021,
<https://www.rfc-editor.org/rfc/rfc9059>.
[RFC9168] Dhody, D., Farrel, A., and Z. Li, "Path Computation
Element Communication Protocol (PCEP) Extension for Flow
Specification", RFC 9168, DOI 10.17487/RFC9168, January
2022, <https://www.rfc-editor.org/rfc/rfc9168>.
[RFC9357] Xiong, Q., "Label Switched Path (LSP) Object Flag
Extension for Stateful PCE", RFC 9357,
DOI 10.17487/RFC9357, February 2023,
<https://www.rfc-editor.org/rfc/rfc9357>.
[RFC9504] Lee, Y., Zheng, H., Gonzalez de Dios, O., Lopez, V., and
Z. Ali, "Path Computation Element Communication Protocol
(PCEP) Extensions for Stateful PCE Usage in GMPLS-
Controlled Networks", RFC 9504, DOI 10.17487/RFC9504,
December 2023, <https://www.rfc-editor.org/rfc/rfc9504>.
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[RFC9603] Li, C., Ed., Kaladharan, P., Sivabalan, S., Koldychev, M.,
and Y. Zhu, "Path Computation Element Communication
Protocol (PCEP) Extensions for IPv6 Segment Routing",
RFC 9603, DOI 10.17487/RFC9603, July 2024,
<https://www.rfc-editor.org/rfc/rfc9603>.
[RFC9604] Sivabalan, S., Filsfils, C., Tantsura, J., Previdi, S.,
and C. Li, Ed., "Carrying Binding Label/SID in PCE-Based
Networks", RFC 9604, DOI 10.17487/RFC9604, August 2024,
<https://www.rfc-editor.org/rfc/rfc9604>.
6.2. Informative References
[I-D.ietf-pce-pceps-tls13]
Dhody, D., Turner, S., and R. Housley, "Updates for PCEPS:
TLS Connection Establishment Restrictions", Work in
Progress, Internet-Draft, draft-ietf-pce-pceps-tls13-04, 9
January 2024, <https://datatracker.ietf.org/doc/html/
draft-ietf-pce-pceps-tls13-04>.
[RFC3692] Narten, T., "Assigning Experimental and Testing Numbers
Considered Useful", BCP 82, RFC 3692,
DOI 10.17487/RFC3692, January 2004,
<https://www.rfc-editor.org/rfc/rfc3692>.
[RFC6709] Carpenter, B., Aboba, B., Ed., and S. Cheshire, "Design
Considerations for Protocol Extensions", RFC 6709,
DOI 10.17487/RFC6709, September 2012,
<https://www.rfc-editor.org/rfc/rfc6709>.
Appendix A. Acknowledgments
Thanks to John Scudder for the initial discussion behind this
document. Thanks to Ketan Talaulikar, Andrew Stone, Samuel Sidor,
Quan Xiong, Cheng Li, and Aijun Wang for the review comments. Thanks
to Carlos Pignataro for the OPSDIR review. Thanks to Meral
Shirazipour for GENART review. Thanks to Paul Kyzivat for ArtArt
review. Thanks to Alexey Melnikov for SECDIR review.
Appendix B. Rationale for updating all registries with Standards Action
This specification updates all the registries with the "Standards
Action" policy. WG considered keeping "Standards Action" for some
registries such as flag fields with limited bits, where the space is
tight but decided against it. The WG's last call and IETF's last
call process should be enough to handle the case of frivolous
experiments taking over the few code points. The working group could
also create a new protocol field and registry for future use as done
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in the past (see [RFC9357]).
Appendix C. Consideration of RFC 8356
It is worth noting that [RFC8356] deliberately chose to make
experimental codepoints available only in the PCEP messages, objects,
and TLV type registries. Appendix A of that document gives a brief
explanation of why that decision was taken stating that:
| The justification for this decision is that, if an experiment
| finds that it wants to use a new codepoint in another PCEP sub-
| registry, it can implement the same function using a new
| experimental object or TLV instead.
While it is true that an experimental implementation could assign an
experimental PCEP object and designate it the "experimental errors
object", using it to carry arbitrary contents including experimental
error codes, such an approach would cause unnecessary divergence in
the code. The allowance of experimental Error-Types is a better
approach that will more easily enable the migration of successful
experiments onto the Standards Track.
Appendix D. Contributor
Haomian Zheng
Huawei Technologies
Email: [email protected]
Authors' Addresses
Dhruv Dhody
Huawei
India
Email: [email protected]
Adrian Farrel
Old Dog Consulting
Email: [email protected]
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