Diff: rfc9753v3.txt - rfc9753.txt

	rfc9753v3.txt	rfc9753.txt

	Internet Engineering Task Force (IETF) C. Li	Internet Engineering Task Force (IETF) C. Li
	Request for Comments: 9753 H. Zheng	Request for Comments: 9753 H. Zheng
	Updates: 8231 Huawei Technologies	Updates: 8231 Huawei Technologies
	Category: Standards Track S. Litkowski	Category: Standards Track S. Litkowski
	ISSN: 2070-1721 Cisco	ISSN: 2070-1721 Cisco

	March 2025	April 2025

	Extension for Stateful PCE to Allow Optional Processing of Path	Extension for Stateful PCE to Allow Optional Processing of Path
	Computation Element Communication Protocol (PCEP) Objects	Computation Element Communication Protocol (PCEP) Objects

	Abstract	Abstract

	This document introduces a mechanism to mark some of the Path	This document introduces a mechanism to mark some of the Path
	Computation Element Communication Protocol (PCEP) objects as optional	Computation Element Communication Protocol (PCEP) objects as optional
	during PCEP message exchange, so the stateful Path Computation	during PCEP message exchange, so the stateful Path Computation
	Element (PCE) model can relax some constraints during path	Element (PCE) model can relax some constraints during path

	skipping to change at line 77 ¶	skipping to change at line 77 ¶
	4. Security Considerations	4. Security Considerations
	5. IANA Considerations	5. IANA Considerations
	5.1. STATEFUL-PCE-CAPABILITY TLV	5.1. STATEFUL-PCE-CAPABILITY TLV
	6. Manageability Considerations	6. Manageability Considerations
	6.1. Control of Function and Policy	6.1. Control of Function and Policy
	6.2. Information and Data Models	6.2. Information and Data Models
	6.3. Liveness Detection and Monitoring	6.3. Liveness Detection and Monitoring
	6.4. Verify Correct Operations	6.4. Verify Correct Operations
	6.5. Requirements on Other Protocols	6.5. Requirements on Other Protocols
	6.6. Impact on Network Operations	6.6. Impact on Network Operations

	7. Acknowledgments	7. References
	8. References	7.1. Normative References
	8.1. Normative References	7.2. Informative References
	8.2. Informative References	Acknowledgments
	Contributors	Contributors
	Authors' Addresses	Authors' Addresses

	1. Introduction	1. Introduction

	[RFC5440] describes the Path Computation Element Communication	[RFC5440] describes the Path Computation Element Communication
	Protocol (PCEP), which enables communication between a Path	Protocol (PCEP), which enables communication between a Path
	Computation Client (PCC) and a Path Control Element (PCE), or between	Computation Client (PCC) and a Path Control Element (PCE), or between
	two PCEs based on the PCE architecture [RFC4655].	two PCEs based on the PCE architecture [RFC4655].


	skipping to change at line 385 ¶	skipping to change at line 385 ¶
	6.5. Requirements on Other Protocols	6.5. Requirements on Other Protocols

	Mechanisms defined in this document do not imply any new requirements	Mechanisms defined in this document do not imply any new requirements
	on other protocols.	on other protocols.

	6.6. Impact on Network Operations	6.6. Impact on Network Operations

	Mechanisms defined in this document do not have any impact on network	Mechanisms defined in this document do not have any impact on network
	operations in addition to those already listed in [RFC5440].	operations in addition to those already listed in [RFC5440].


	7. Acknowledgments	7. References

	Thanks to Jonathan Hardwick for the discussion and suggestions around
	this document.

	Thanks to Oscar Gonzalez de Dios, Mike Koldychev, Samuel Sidor, and
	Peng Shaofu for their review comments.

	8. References


	8.1. Normative References	7.1. Normative References

	[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate	[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
	Requirement Levels", BCP 14, RFC 2119,	Requirement Levels", BCP 14, RFC 2119,
	DOI 10.17487/RFC2119, March 1997,	DOI 10.17487/RFC2119, March 1997,
	<https://www.rfc-editor.org/info/rfc2119>.	<https://www.rfc-editor.org/info/rfc2119>.

	[RFC5440] Vasseur, JP., Ed. and JL. Le Roux, Ed., "Path Computation	[RFC5440] Vasseur, JP., Ed. and JL. Le Roux, Ed., "Path Computation
	Element (PCE) Communication Protocol (PCEP)", RFC 5440,	Element (PCE) Communication Protocol (PCEP)", RFC 5440,
	DOI 10.17487/RFC5440, March 2009,	DOI 10.17487/RFC5440, March 2009,
	<https://www.rfc-editor.org/info/rfc5440>.	<https://www.rfc-editor.org/info/rfc5440>.

	skipping to change at line 429 ¶	skipping to change at line 421 ¶
	Path Computation Element Communication Protocol (PCEP)",	Path Computation Element Communication Protocol (PCEP)",
	RFC 8253, DOI 10.17487/RFC8253, October 2017,	RFC 8253, DOI 10.17487/RFC8253, October 2017,
	<https://www.rfc-editor.org/info/rfc8253>.	<https://www.rfc-editor.org/info/rfc8253>.

	[RFC8281] Crabbe, E., Minei, I., Sivabalan, S., and R. Varga, "Path	[RFC8281] Crabbe, E., Minei, I., Sivabalan, S., and R. Varga, "Path
	Computation Element Communication Protocol (PCEP)	Computation Element Communication Protocol (PCEP)
	Extensions for PCE-Initiated LSP Setup in a Stateful PCE	Extensions for PCE-Initiated LSP Setup in a Stateful PCE
	Model", RFC 8281, DOI 10.17487/RFC8281, December 2017,	Model", RFC 8281, DOI 10.17487/RFC8281, December 2017,
	<https://www.rfc-editor.org/info/rfc8281>.	<https://www.rfc-editor.org/info/rfc8281>.


	8.2. Informative References	7.2. Informative References

	[PCEP-YANG]	[PCEP-YANG]
	Dhody, D., Ed., Beeram, V. P., Hardwick, J., and J.	Dhody, D., Ed., Beeram, V. P., Hardwick, J., and J.
	Tantsura, "A YANG Data Model for Path Computation Element	Tantsura, "A YANG Data Model for Path Computation Element
	Communications Protocol (PCEP)", Work in Progress,	Communications Protocol (PCEP)", Work in Progress,
	Internet-Draft, draft-ietf-pce-pcep-yang-30, 26 January	Internet-Draft, draft-ietf-pce-pcep-yang-30, 26 January
	2025, <https://datatracker.ietf.org/doc/html/draft-ietf-	2025, <https://datatracker.ietf.org/doc/html/draft-ietf-
	pce-pcep-yang-30>.	pce-pcep-yang-30>.

	[RFC4655] Farrel, A., Vasseur, J.-P., and J. Ash, "A Path	[RFC4655] Farrel, A., Vasseur, J.-P., and J. Ash, "A Path

	skipping to change at line 461 ¶	skipping to change at line 453 ¶
	Protocol (PCEP) to Compute Service-Aware Label Switched	Protocol (PCEP) to Compute Service-Aware Label Switched
	Paths (LSPs)", RFC 8233, DOI 10.17487/RFC8233, September	Paths (LSPs)", RFC 8233, DOI 10.17487/RFC8233, September
	2017, <https://www.rfc-editor.org/info/rfc8233>.	2017, <https://www.rfc-editor.org/info/rfc8233>.

	[RFC9325] Sheffer, Y., Saint-Andre, P., and T. Fossati,	[RFC9325] Sheffer, Y., Saint-Andre, P., and T. Fossati,
	"Recommendations for Secure Use of Transport Layer	"Recommendations for Secure Use of Transport Layer
	Security (TLS) and Datagram Transport Layer Security	Security (TLS) and Datagram Transport Layer Security
	(DTLS)", BCP 195, RFC 9325, DOI 10.17487/RFC9325, November	(DTLS)", BCP 195, RFC 9325, DOI 10.17487/RFC9325, November
	2022, <https://www.rfc-editor.org/info/rfc9325>.	2022, <https://www.rfc-editor.org/info/rfc9325>.


		Acknowledgments

		Thanks to Jonathan Hardwick for the discussion and suggestions around
		this document.

		Thanks to Oscar Gonzalez de Dios, Mike Koldychev, Samuel Sidor, and
		Peng Shaofu for their review comments.

	Contributors	Contributors

	Dhruv Dhody	Dhruv Dhody
	Huawei	Huawei
	India	India
	Email: dhruv.ietf@gmail.com	Email: dhruv.ietf@gmail.com

	Authors' Addresses	Authors' Addresses

	Cheng Li	Cheng Li

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