< draft-bryant-rtgwg-plfa-03.txt		draft-bryant-rtgwg-plfa-04.txt >
	Routing Area Working Group S. Bryant		Routing Area Working Group S. Bryant
	Internet-Draft University of Surrey		Internet-Draft University of Surrey ICS
	Intended status: Informational U. Chunduri		Intended status: Informational U. Chunduri
	Expires: June 27, 2022 Intel		Expires: November 10, 2022 Intel
	T. Eckert		T. Eckert
	Futurewei Technologies Inc		Futurewei Technologies Inc
	December 24, 2021		May 09, 2022
	Preferred Path Loop-Free Alternate (pLFA)		Preferred Path Loop-Free Alternate (pLFA)
	draft-bryant-rtgwg-plfa-03		draft-bryant-rtgwg-plfa-04
	Abstract		Abstract
	Fast re-route (FRR) is a technique that allows productive forwarding		Fast re-route (FRR) is a technique that allows productive forwarding
	to continue in a network after a failure has occurred, but before the		to continue in a network after a failure has occurred, but before the
	network has has time to re-converge. This is achieved by forwarding		network has has time to re-converge. This is achieved by forwarding
	a packet on an alternate path that will not result in the packet		a packet on an alternate path that will not result in the packet
	looping. Preferred Path Routing (PPR) provides a method of injecting		looping. Preferred Path Routing (PPR) provides a method of injecting
	explicit paths into the routing protocol. The use of PPR to support		explicit paths into the routing protocol. The use of PPR to support
	FRR has a number of advantages. This document describes the		FRR has a number of advantages. This document describes the
	skipping to change at page 1, line 41 ¶		skipping to change at page 1, line 41 ¶
	Internet-Drafts are working documents of the Internet Engineering		Internet-Drafts are working documents of the Internet Engineering
	Task Force (IETF). Note that other groups may also distribute		Task Force (IETF). Note that other groups may also distribute
	working documents as Internet-Drafts. The list of current Internet-		working documents as Internet-Drafts. The list of current Internet-
	Drafts is at https://datatracker.ietf.org/drafts/current/.		Drafts is at https://datatracker.ietf.org/drafts/current/.
	Internet-Drafts are draft documents valid for a maximum of six months		Internet-Drafts are draft documents valid for a maximum of six months
	and may be updated, replaced, or obsoleted by other documents at any		and may be updated, replaced, or obsoleted by other documents at any
	time. It is inappropriate to use Internet-Drafts as reference		time. It is inappropriate to use Internet-Drafts as reference
	material or to cite them other than as "work in progress."		material or to cite them other than as "work in progress."
	This Internet-Draft will expire on June 27, 2022.		This Internet-Draft will expire on November 10, 2022.
	Copyright Notice		Copyright Notice
	Copyright (c) 2021 IETF Trust and the persons identified as the		Copyright (c) 2022 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 Simplified BSD License text as described in Section 4.e of		include Simplified BSD License text as described in Section 4.e of
	the Trust Legal Provisions and are provided without warranty as		the Trust Legal Provisions and are provided without warranty as
	skipping to change at page 18, line 16 ¶		skipping to change at page 18, line 16 ¶
	[I-D.bryant-ipfrr-tunnels]		[I-D.bryant-ipfrr-tunnels]
	Bryant, S., Filsfils, C., Previdi, S., and M. Shand, "IP		Bryant, S., Filsfils, C., Previdi, S., and M. Shand, "IP
	Fast Reroute using tunnels", draft-bryant-ipfrr-tunnels-03		Fast Reroute using tunnels", draft-bryant-ipfrr-tunnels-03
	(work in progress), November 2007.		(work in progress), November 2007.
	[I-D.ietf-rtgwg-segment-routing-ti-lfa]		[I-D.ietf-rtgwg-segment-routing-ti-lfa]
	Litkowski, S., Bashandy, A., Filsfils, C., Francois, P.,		Litkowski, S., Bashandy, A., Filsfils, C., Francois, P.,
	Decraene, B., and D. Voyer, "Topology Independent Fast		Decraene, B., and D. Voyer, "Topology Independent Fast
	Reroute using Segment Routing", draft-ietf-rtgwg-segment-		Reroute using Segment Routing", draft-ietf-rtgwg-segment-
	routing-ti-lfa-07 (work in progress), June 2021.		routing-ti-lfa-08 (work in progress), January 2022.
	[I-D.xu-isis-encapsulation-cap]		[I-D.xu-isis-encapsulation-cap]
	Xu, X., Decraene, B., Raszuk, R., Chunduri, U., Contreras,		Xu, X., Decraene, B., Raszuk, R., Chunduri, U., Contreras,
	L. M., and L. Jalil, "Advertising Tunnelling Capability in		L. M., and L. Jalil, "Advertising Tunnelling Capability in
	IS-IS", draft-xu-isis-encapsulation-cap-07 (work in		IS-IS", draft-xu-isis-encapsulation-cap-07 (work in
	progress), October 2016.		progress), October 2016.
	[RFC3936] Kompella, K. and J. Lang, "Procedures for Modifying the		[RFC3936] Kompella, K. and J. Lang, "Procedures for Modifying the
	Resource reSerVation Protocol (RSVP)", BCP 96, RFC 3936,		Resource reSerVation Protocol (RSVP)", BCP 96, RFC 3936,
	DOI 10.17487/RFC3936, October 2004,		DOI 10.17487/RFC3936, October 2004,
	skipping to change at page 19, line 43 ¶		skipping to change at page 19, line 43 ¶
	March 2019, <https://www.rfc-editor.org/info/rfc8518>.		March 2019, <https://www.rfc-editor.org/info/rfc8518>.
	[RFC8754] Filsfils, C., Ed., Dukes, D., Ed., Previdi, S., Leddy, J.,		[RFC8754] Filsfils, C., Ed., Dukes, D., Ed., Previdi, S., Leddy, J.,
	Matsushima, S., and D. Voyer, "IPv6 Segment Routing Header		Matsushima, S., and D. Voyer, "IPv6 Segment Routing Header
	(SRH)", RFC 8754, DOI 10.17487/RFC8754, March 2020,		(SRH)", RFC 8754, DOI 10.17487/RFC8754, March 2020,
	<https://www.rfc-editor.org/info/rfc8754>.		<https://www.rfc-editor.org/info/rfc8754>.
	Authors' Addresses		Authors' Addresses
	Stewart Bryant		Stewart Bryant
	University of Surrey		University of Surrey ICS
	Email: sb@stewartbryant.com		Email: sb@stewartbryant.com
	Uma Chunduri		Uma Chunduri
	Intel		Intel
	Email: umac.ietf@gmail.com		Email: umac.ietf@gmail.com
	Toerless Eckert		Toerless Eckert
	Futurewei Technologies Inc		Futurewei Technologies Inc
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