draft-ietf-lsr-ip-flexalgo-02.txt		draft-ietf-lsr-ip-flexalgo-03.txt
	LSR Working Group W. Britto		LSR Working Group W. Britto
	Internet-Draft S. Hegde		Internet-Draft S. Hegde
	Intended status: Standards Track P. Kaneriya		Intended status: Standards Track P. Kaneriya
	Expires: October 30, 2021 R. Shetty		Expires: November 15, 2021 R. Shetty
	R. Bonica		R. Bonica
	Juniper Networks		Juniper Networks
	P. Psenak		P. Psenak
	Cisco Systems		Cisco Systems
	April 28, 2021		May 14, 2021
	IGP Flexible Algorithms (Flex-Algorithm) In IP Networks		IGP Flexible Algorithms (Flex-Algorithm) In IP Networks
	draft-ietf-lsr-ip-flexalgo-02		draft-ietf-lsr-ip-flexalgo-03
	Abstract		Abstract
	An IGP Flexible Algorithm (Flex-Algorithm) allows IGP to compute		An IGP Flexible Algorithm (Flex-Algorithm) allows IGP to compute
	constraint-based paths. As currently defined, IGP Flex-Algorithm is		constraint-based paths. As currently defined, IGP Flex-Algorithm is
	used with Segment Routing (SR) data planes - SR MPLS and SRv6.		used with Segment Routing (SR) data planes - SR MPLS and SRv6.
	Therefore, Flex-Algorithm cannot be deployed in the absence of SR.		Therefore, Flex-Algorithm cannot be deployed in the absence of SR.
	This document extends IGP Flex-Algorithm, so that it can be used for		This document extends IGP Flex-Algorithm, so that it can be used for
	regular IPv4 and IPv6 prefixes. This allows Flex-Algorithm to be		regular IPv4 and IPv6 prefixes. This allows Flex-Algorithm to be
	skipping to change at page 1, line 42 ¶		skipping to change at page 1, line 42 ¶
	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 October 30, 2021.		This Internet-Draft will expire on November 15, 2021.
	Copyright Notice		Copyright Notice
	Copyright (c) 2021 IETF Trust and the persons identified as the		Copyright (c) 2021 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
	skipping to change at page 7, line 45 ¶		skipping to change at page 7, line 45 ¶
	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+		+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	ISIS IPv4 Algorithm Prefix Reachability TLV		ISIS IPv4 Algorithm Prefix Reachability TLV
	o Metric (4 octets): Metric information.		o Metric (4 octets): Metric information.
	o Flags (1 octet):		o Flags (1 octet):
	0 1 2 3 4 5 6 7		0 1 2 3 4 5 6 7
	+-+-+-+-+-+-+-+-+		+-+-+-+-+-+-+-+-+
	|D|S| | |		|D| Reserved |
	+-+-+-+-+-+-+-+-+		+-+-+-+-+-+-+-+-+
	D-flag: When the Prefix is leaked from level-2 to level-1, the		D-flag: When the Prefix is leaked from level-2 to level-1, the
	D bit MUST be set. Otherwise, this bit MUST be clear.		D bit MUST be set. Otherwise, this bit MUST be clear.
	Prefixes with the D bit set MUST NOT be leaked from level-1 to		Prefixes with the D bit set MUST NOT be leaked from level-1 to
	level-2. This is to prevent looping.		level-2. This is to prevent looping.
	S-flag: Set when Sub-TLVs are present for the prefix entry.
	o Algorithm (1 octet): Associated Algorithm from 1 to 255.		o Algorithm (1 octet): Associated Algorithm from 1 to 255.
	o Prefix Len (1 octet): Prefix length measured in bits.		o Prefix Len (1 octet): Prefix length measured in bits.
	o Prefix (variable length): Prefix mapped to Flex-Algorithm.		o Prefix (variable length): Prefix mapped to Flex-Algorithm.
	o Optional Sub-TLV-length (1 octet): Number of octets used by sub-		o Optional Sub-TLV-length (1 octet): Number of octets used by sub-
	TLVs		TLVs
	o Optional sub-TLVs (variable length).		o Optional sub-TLVs (variable length).
	skipping to change at page 10, line 4 ¶		skipping to change at page 9, line 47 ¶
	OSPFv2 Algorithm Prefix Reachability TLV		OSPFv2 Algorithm Prefix Reachability TLV
	Type: Algorithm Prefix Reachability TLV (Value TBD by IANA).		Type: Algorithm Prefix Reachability TLV (Value TBD by IANA).
	Length: Variable dependent on sub-TLVs.		Length: Variable dependent on sub-TLVs.
	Route Type (1 octet): type of the OSPF route. Supported types		Route Type (1 octet): type of the OSPF route. Supported types
	are:		are:
	1 - Intra-Area		1 - Intra-Area
	2 - Inter-Area
			2 - Inter-Area
	3 - AS External with Type-1 Metric		3 - AS External with Type-1 Metric
	4 - AS External with Type-2 Metric		4 - AS External with Type-2 Metric
	5 - NSSA External with Type-1 Metric		5 - NSSA External with Type-1 Metric
	6 - NSSA External with Type-2 Metric		6 - NSSA External with Type-2 Metric
	Prefix Length (1 octet): Length of prefix in bits.		Prefix Length (1 octet): Length of prefix in bits.
	skipping to change at page 14, line 31 ¶		skipping to change at page 14, line 31 ¶
	+-------+----------------------------------+------------------------+		+-------+----------------------------------+------------------------+
	| Value | TLV Name | Reference |		| Value | TLV Name | Reference |
	+-------+----------------------------------+------------------------+		+-------+----------------------------------+------------------------+
	| TBD | OSPFv2 Algorithm Prefix | This Document, |		| TBD | OSPFv2 Algorithm Prefix | This Document, |
	| | Reachability TLV | Section 6.1 |		| | Reachability TLV | Section 6.1 |
	+-------+----------------------------------+------------------------+		+-------+----------------------------------+------------------------+
	12. Security Considerations		12. Security Considerations
	TBD		This document inherits security considerations from
			[I-D.ietf-lsr-flex-algo].
	13. Acknowledgements		13. Acknowledgements
	TBD.		Thanks to Bruno Decraene for his contributions to this document.
	14. References		14. References
	14.1. Normative References		14.1. Normative References
	[I-D.ietf-lsr-flex-algo]		[I-D.ietf-lsr-flex-algo]
	Psenak, P., Hegde, S., Filsfils, C., Talaulikar, K., and		Psenak, P., Hegde, S., Filsfils, C., Talaulikar, K., and
	A. Gulko, "IGP Flexible Algorithm", draft-ietf-lsr-flex-		A. Gulko, "IGP Flexible Algorithm", draft-ietf-lsr-flex-
	algo-14 (work in progress), February 2021.		algo-15 (work in progress), April 2021.
	[ISO10589]		[ISO10589]
	IANA, "Intermediate system to Intermediate system routing		IANA, "Intermediate system to Intermediate system routing
	information exchange protocol for use in conjunction with		information exchange protocol for use in conjunction with
	the Protocol for providing the Connectionless-mode Network		the Protocol for providing the Connectionless-mode Network
	Service (ISO 8473)", August 1987, <ISO/IEC 10589:2002>.		Service (ISO 8473)", August 1987, <ISO/IEC 10589:2002>.
	[RFC0791] Postel, J., "Internet Protocol", STD 5, RFC 791,		[RFC0791] Postel, J., "Internet Protocol", STD 5, RFC 791,
	DOI 10.17487/RFC0791, September 1981,		DOI 10.17487/RFC0791, September 1981,
	<https://www.rfc-editor.org/info/rfc791>.		<https://www.rfc-editor.org/info/rfc791>.
	skipping to change at page 16, line 22 ¶		skipping to change at page 16, line 22 ¶
	May 2017, <https://www.rfc-editor.org/info/rfc8174>.		May 2017, <https://www.rfc-editor.org/info/rfc8174>.
	[RFC8200] Deering, S. and R. Hinden, "Internet Protocol, Version 6		[RFC8200] Deering, S. and R. Hinden, "Internet Protocol, Version 6
	(IPv6) Specification", STD 86, RFC 8200,		(IPv6) Specification", STD 86, RFC 8200,
	DOI 10.17487/RFC8200, July 2017,		DOI 10.17487/RFC8200, July 2017,
	<https://www.rfc-editor.org/info/rfc8200>.		<https://www.rfc-editor.org/info/rfc8200>.
	14.2. Informative References		14.2. Informative References
	[I-D.ietf-spring-srv6-network-programming]		[I-D.ietf-spring-srv6-network-programming]
	Filsfils, C., Camarillo, P., Leddy, J., Voyer, D.,		Filsfils, C., Garvia, P. C., Leddy, J., Voyer, D.,
	Matsushima, S., and Z. Li, "SRv6 Network Programming",		Matsushima, S., and Z. Li, "Segment Routing over IPv6
	draft-ietf-spring-srv6-network-programming-28 (work in		(SRv6) Network Programming", draft-ietf-spring-srv6-
	progress), December 2020.		network-programming-28 (work in progress), December 2020.
	[IANA-ALG]		[IANA-ALG]
	IANA, "Sub-TLVs for TLV 242 (IS-IS Router CAPABILITY		IANA, "Sub-TLVs for TLV 242 (IS-IS Router CAPABILITY
	TLV)", August 1987, <https://www.iana.org/assignments/igp-		TLV)", August 1987, <https://www.iana.org/assignments/igp-
	parameters/igp-parameters.xhtml#igp-algorithm-types>.		parameters/igp-parameters.xhtml#igp-algorithm-types>.
	[RFC5286] Atlas, A., Ed. and A. Zinin, Ed., "Basic Specification for		[RFC5286] Atlas, A., Ed. and A. Zinin, Ed., "Basic Specification for
	IP Fast Reroute: Loop-Free Alternates", RFC 5286,		IP Fast Reroute: Loop-Free Alternates", RFC 5286,
	DOI 10.17487/RFC5286, September 2008,		DOI 10.17487/RFC5286, September 2008,
	<https://www.rfc-editor.org/info/rfc5286>.		<https://www.rfc-editor.org/info/rfc5286>.
End of changes. 12 change blocks.
	15 lines changed or deleted		14 lines changed or added
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