rfc9895v5.txt		rfc9895.txt
	Internet Engineering Task Force (IETF) D. Wiggins		Internet Engineering Task Force (IETF) D. Wiggins
	Request for Comments: 9895		Request for Comments: 9895
	Category: Standards Track L. Berger		Category: Standards Track L. Berger
	ISSN: 2070-1721 LabN Consulting, L.L.C.		ISSN: 2070-1721 LabN Consulting, L.L.C.
	D. Eastlake 3rd, Ed.		D. Eastlake 3rd, Ed.
	Independent		Independent
	November 2025		January 2026
	Dynamic Link Exchange Protocol (DLEP) IEEE 802.1Q Aware Credit Window		Dynamic Link Exchange Protocol (DLEP) IEEE 802.1Q Aware Credit Window
	Extension		Extension
	Abstract		Abstract
	This document defines an extension to the Dynamic Link Exchange		This document defines an extension to the Dynamic Link Exchange
	Protocol (DLEP) that enables an Ethernet IEEE 802.1Q aware credit		Protocol (DLEP) that enables an Ethernet IEEE 802.1Q aware credit
	window scheme for destination-specific and shared flow control.		window scheme for destination-specific and shared flow control.
	skipping to change at line 35 ¶		skipping to change at line 35 ¶
	received public review and has been approved for publication by the		received public review and has been approved for publication by the
	Internet Engineering Steering Group (IESG). Further information on		Internet Engineering Steering Group (IESG). Further information on
	Internet Standards is available in Section 2 of RFC 7841.		Internet Standards is available in Section 2 of RFC 7841.
	Information about the current status of this document, any errata,		Information about the current status of this document, any errata,
	and how to provide feedback on it may be obtained at		and how to provide feedback on it may be obtained at
	https://www.rfc-editor.org/info/rfc9895.		https://www.rfc-editor.org/info/rfc9895.
	Copyright Notice		Copyright Notice
	Copyright (c) 2025 IETF Trust and the persons identified as the		Copyright (c) 2026 IETF Trust and the persons identified as the
	document authors. All rights reserved.		document authors. All rights reserved.
	This document is subject to BCP 78 and the IETF Trust's Legal		This document is subject to BCP 78 and the IETF Trust's Legal
	Provisions Relating to IETF Documents		Provisions Relating to IETF Documents
	(https://trustee.ietf.org/license-info) in effect on the date of		(https://trustee.ietf.org/license-info) in effect on the date of
	publication of this document. Please review these documents		publication of this document. Please review these documents
	carefully, as they describe your rights and restrictions with respect		carefully, as they describe your rights and restrictions with respect
	to this document. Code Components extracted from this document must		to this document. Code Components extracted from this document must
	include Revised BSD License text as described in Section 4.e of the		include Revised BSD License text as described in Section 4.e of the
	Trust Legal Provisions and are provided without warranty as described		Trust Legal Provisions and are provided without warranty as described
	skipping to change at line 75 ¶		skipping to change at line 75 ¶
	The protocol provides the exchange of link-related control		The protocol provides the exchange of link-related control
	information between DLEP peers. DLEP peers consist of a modem and a		information between DLEP peers. DLEP peers consist of a modem and a
	router. DLEP defines a base set of mechanisms as well as support for		router. DLEP defines a base set of mechanisms as well as support for
	possible extensions. This document defines one such extension.		possible extensions. This document defines one such extension.
	The DLEP specification does not define any flow control mechanisms.		The DLEP specification does not define any flow control mechanisms.
	While in theory various flow control techniques could be implemented		While in theory various flow control techniques could be implemented
	with DLEP, this document specifies a DLEP extension that introduces		with DLEP, this document specifies a DLEP extension that introduces
	an Ethernet-based flow control mechanism for traffic transmitted from		an Ethernet-based flow control mechanism for traffic transmitted from
	a router to a modem. This mechanism utilizes one or more logical		a router to a modem. This mechanism utilizes one or more logical
	"Credit Windows", each of which is typically associated with a		"credit windows", each of which is typically associated with a
	virtual or physical queue. The router leverages traffic flow		virtual or physical queue. The router leverages traffic flow
	classification information provided by the modem to determine the		classification information provided by the modem to determine the
	appropriate credit window for a given traffic flow. Credit windows		appropriate credit window for a given traffic flow. Credit windows
	may be shared across multiple flows or used on a per-flow basis. For		may be shared across multiple flows or used on a per-flow basis. For
	a Diffserv-based approach to credit window flow control, refer to		a Diffserv-based approach to credit window flow control, refer to
	[RFC9894]. As specified in Section 2.3.1 of [RFC9892], when both		[RFC9894]. As specified in Section 2.3.1 of [RFC9892], when both
	Diffserv and Ethernet traffic classification are applied to a flow,		Diffserv and Ethernet traffic classification are applied to a flow,
	Ethernet-based classification takes precedence.		Ethernet-based classification takes precedence.
	This document leverages the traffic classification and credit window		This document leverages the traffic classification and credit window
	skipping to change at line 240 ¶		skipping to change at line 240 ¶
	May 2017, <https://www.rfc-editor.org/info/rfc8174>.		May 2017, <https://www.rfc-editor.org/info/rfc8174>.
	[RFC8175] Ratliff, S., Jury, S., Satterwhite, D., Taylor, R., and B.		[RFC8175] Ratliff, S., Jury, S., Satterwhite, D., Taylor, R., and B.
	Berry, "Dynamic Link Exchange Protocol (DLEP)", RFC 8175,		Berry, "Dynamic Link Exchange Protocol (DLEP)", RFC 8175,
	DOI 10.17487/RFC8175, June 2017,		DOI 10.17487/RFC8175, June 2017,
	<https://www.rfc-editor.org/info/rfc8175>.		<https://www.rfc-editor.org/info/rfc8175>.
	[RFC9892] Cheng, B., Wiggins, D., Berger, L., and D. Fedyk, Ed.,		[RFC9892] Cheng, B., Wiggins, D., Berger, L., and D. Fedyk, Ed.,
	"Dynamic Link Exchange Protocol (DLEP) Traffic		"Dynamic Link Exchange Protocol (DLEP) Traffic
	Classification Data Item", RFC 9892, DOI 10.17487/RFC9892,		Classification Data Item", RFC 9892, DOI 10.17487/RFC9892,
	November 2025, <https://www.rfc-editor.org/info/rfc9892>.		January 2026, <https://www.rfc-editor.org/info/rfc9892>.
	[RFC9893] Cheng, B., Wiggins, D., Ratliff, S., Berger, L., and E.		[RFC9893] Cheng, B., Wiggins, D., Ratliff, S., Berger, L., and E.
	Kinzie, Ed., "Dynamic Link Exchange Protocol (DLEP)		Kinzie, Ed., "Dynamic Link Exchange Protocol (DLEP)
	Credit-Based Flow Control Messages and Data Items",		Credit-Based Flow Control Messages and Data Items",
	RFC 9893, DOI 10.17487/RFC9893, November 2025,		RFC 9893, DOI 10.17487/RFC9893, January 2026,
	<https://www.rfc-editor.org/info/rfc9893>.		<https://www.rfc-editor.org/info/rfc9893>.
	6.2. Informative References		6.2. Informative References
	[RFC9894] Cheng, B., Wiggins, D., Berger, L., and D. Eastlake 3rd,		[RFC9894] Cheng, B., Wiggins, D., Berger, L., and D. Eastlake 3rd,
	Ed., "Dynamic Link Exchange Protocol (DLEP) Diffserv Aware		Ed., "Dynamic Link Exchange Protocol (DLEP) Diffserv Aware
	Credit Window Extension", RFC 9894, DOI 10.17487/RFC9894,		Credit Window Extension", RFC 9894, DOI 10.17487/RFC9894,
	November 2025, <https://www.rfc-editor.org/info/rfc9894>.		January 2026, <https://www.rfc-editor.org/info/rfc9894>.
	Acknowledgments		Acknowledgments
	This document was motivated by discussions in the MANET Working		This document was motivated by discussions in the MANET Working
	Group. Many useful comments were received from contributors to the		Group. Many useful comments were received from contributors to the
	MANET Working Group, notably Ronald in 't Velt.		MANET Working Group, notably Ronald in 't Velt.
	We had the honor of working too briefly with David Wiggins on this		We had the honor of working too briefly with David Wiggins on this
	and related DLEP work. His contribution to the IETF and publication		and related DLEP work. His contribution to the IETF and publication
	of the first and definitive open-source DLEP implementation have been		of the first and definitive open-source DLEP implementation have been
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