draft-ietf-lsr-isis-srv6-extensions-17.txt		draft-ietf-lsr-isis-srv6-extensions-18.txt
	Networking Working Group P. Psenak, Ed.		Networking Working Group P. Psenak, Ed.
	Internet-Draft C. Filsfils		Internet-Draft C. Filsfils
	Updates: 7370 (if approved) Cisco Systems		Updates: 7370 (if approved) Cisco Systems
	Intended status: Standards Track A. Bashandy		Intended status: Standards Track A. Bashandy
	Expires: December 20, 2021 Individual		Expires: April 23, 2022 Individual
	B. Decraene		B. Decraene
	Orange		Orange
	Z. Hu		Z. Hu
	Huawei Technologies		Huawei Technologies
	June 18, 2021		October 20, 2021
	IS-IS Extensions to Support Segment Routing over IPv6 Dataplane		IS-IS Extensions to Support Segment Routing over IPv6 Dataplane
	draft-ietf-lsr-isis-srv6-extensions-17		draft-ietf-lsr-isis-srv6-extensions-18
	Abstract		Abstract
	The Segment Routing (SR) architecture allows flexible definition of		The Segment Routing (SR) architecture allows flexible definition of
	the end-to-end path by encoding it as a sequence of topological		the end-to-end path by encoding it as a sequence of topological
	elements called "segments". It can be implemented over the MPLS or		elements called "segments". It can be implemented over the MPLS or
	the IPv6 data plane. This document describes the IS-IS extensions		the IPv6 data plane. This document describes the IS-IS extensions
	required to support Segment Routing over the IPv6 data plane.		required to support Segment Routing over the IPv6 data plane.
	This document updates RFC 7370 by modifying an existing registry.		This document updates RFC 7370 by modifying an existing registry.
	skipping to change at page 2, line 4 ¶		skipping to change at page 2, line 4 ¶
	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 December 20, 2021.		This Internet-Draft will expire on April 23, 2022.
	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
	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
	described in the Simplified BSD License.		described in the Simplified BSD License.
	Table of Contents		Table of Contents
	1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3		1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
	2. SRv6 Capabilities sub-TLV . . . . . . . . . . . . . . . . . . 4		2. SRv6 Capabilities sub-TLV . . . . . . . . . . . . . . . . . . 4
	3. Advertising Supported Algorithms . . . . . . . . . . . . . . 4		3. Advertising Supported Algorithms . . . . . . . . . . . . . . 5
	4. Advertising Maximum SRv6 SID Depths . . . . . . . . . . . . . 5		4. Advertising Maximum SRv6 SID Depths . . . . . . . . . . . . . 5
	4.1. Maximum Segments Left MSD Type . . . . . . . . . . . . . 5		4.1. Maximum Segments Left MSD Type . . . . . . . . . . . . . 5
	4.2. Maximum End Pop MSD Type . . . . . . . . . . . . . . . . 5		4.2. Maximum End Pop MSD Type . . . . . . . . . . . . . . . . 5
	4.3. Maximum H.Encaps MSD Type . . . . . . . . . . . . . . . . 5		4.3. Maximum H.Encaps MSD Type . . . . . . . . . . . . . . . . 5
	4.4. Maximum End D MSD Type . . . . . . . . . . . . . . . . . 6		4.4. Maximum End D MSD Type . . . . . . . . . . . . . . . . . 6
	5. SRv6 SIDs and Reachability . . . . . . . . . . . . . . . . . 6		5. SRv6 SIDs and Reachability . . . . . . . . . . . . . . . . . 6
	6. Advertising Anycast Property . . . . . . . . . . . . . . . . 7		6. Advertising Anycast Property . . . . . . . . . . . . . . . . 8
	7. Advertising Locators and End SIDs . . . . . . . . . . . . . . 8		7. Advertising Locators and End SIDs . . . . . . . . . . . . . . 9
	7.1. SRv6 Locator TLV Format . . . . . . . . . . . . . . . . . 9		7.1. SRv6 Locator TLV Format . . . . . . . . . . . . . . . . . 9
	7.2. SRv6 End SID sub-TLV . . . . . . . . . . . . . . . . . . 10		7.2. SRv6 End SID sub-TLV . . . . . . . . . . . . . . . . . . 11
	8. Advertising SRv6 Adjacency SIDs . . . . . . . . . . . . . . . 12		8. Advertising SRv6 Adjacency SIDs . . . . . . . . . . . . . . . 12
	8.1. SRv6 End.X SID sub-TLV . . . . . . . . . . . . . . . . . 12		8.1. SRv6 End.X SID sub-TLV . . . . . . . . . . . . . . . . . 13
	8.2. SRv6 LAN End.X SID sub-TLV . . . . . . . . . . . . . . . 14		8.2. SRv6 LAN End.X SID sub-TLV . . . . . . . . . . . . . . . 14
	9. SRv6 SID Structure Sub-Sub-TLV . . . . . . . . . . . . . . . 16		9. SRv6 SID Structure Sub-Sub-TLV . . . . . . . . . . . . . . . 16
	10. Advertising Endpoint Behaviors . . . . . . . . . . . . . . . 17		10. Advertising Endpoint Behaviors . . . . . . . . . . . . . . . 17
	11. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 18		11. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 18
	11.1. SRv6 Locator TLV . . . . . . . . . . . . . . . . . . . . 18		11.1. SRv6 Locator TLV . . . . . . . . . . . . . . . . . . . . 18
	11.1.1. SRv6 End SID sub-TLV . . . . . . . . . . . . . . . . 18		11.1.1. SRv6 End SID sub-TLV . . . . . . . . . . . . . . . . 18
	11.1.2. Revised sub-TLV table . . . . . . . . . . . . . . . 19		11.1.2. Revised sub-TLV table . . . . . . . . . . . . . . . 19
	11.2. SRv6 Capabilities sub-TLV . . . . . . . . . . . . . . . 19		11.2. SRv6 Capabilities sub-TLV . . . . . . . . . . . . . . . 19
	11.3. Sub-Sub-TLVs of the SRv6 Capability sub-TLV . . . . . . 20		11.3. Sub-Sub-TLVs of the SRv6 Capability sub-TLV . . . . . . 20
	11.4. SRv6 End.X SID and SRv6 LAN End.X SID sub-TLVs . . . . . 20		11.4. SRv6 End.X SID and SRv6 LAN End.X SID sub-TLVs . . . . . 20
	11.5. MSD Types . . . . . . . . . . . . . . . . . . . . . . . 20		11.5. MSD Types . . . . . . . . . . . . . . . . . . . . . . . 20
	11.6. Sub-Sub-TLVs for SID Sub-TLVs . . . . . . . . . . . . . 21		11.6. Sub-Sub-TLVs for SID Sub-TLVs . . . . . . . . . . . . . 21
	11.7. Prefix Attribute Flags Sub-TLV . . . . . . . . . . . . . 21		11.7. Prefix Attribute Flags Sub-TLV . . . . . . . . . . . . . 21
	11.8. ISIS SRv6 Capabilities sub-TLV Flags Registry . . . . . 22		11.8. ISIS SRv6 Capabilities sub-TLV Flags Registry . . . . . 21
	11.9. ISIS SRv6 Locator TLV Flags Registry . . . . . . . . . . 22		11.9. ISIS SRv6 Locator TLV Flags Registry . . . . . . . . . . 22
	11.10. ISIS SRv6 End SID sub-TLV Flags Registry . . . . . . . . 22		11.10. ISIS SRv6 End SID sub-TLV Flags Registry . . . . . . . . 22
	11.11. ISIS SRv6 End.X SID and LAN End.X SID sub-TLVs Flags		11.11. ISIS SRv6 End.X SID and LAN End.X SID sub-TLVs Flags
	Registry . . . . . . . . . . . . . . . . . . . . . . . . 23		Registry . . . . . . . . . . . . . . . . . . . . . . . . 23
	12. Security Considerations . . . . . . . . . . . . . . . . . . . 23		12. Security Considerations . . . . . . . . . . . . . . . . . . . 23
	13. Contributors . . . . . . . . . . . . . . . . . . . . . . . . 24		13. Contributors . . . . . . . . . . . . . . . . . . . . . . . . 24
	14. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 25		14. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 25
	15. References . . . . . . . . . . . . . . . . . . . . . . . . . 26		15. References . . . . . . . . . . . . . . . . . . . . . . . . . 26
	15.1. Normative References . . . . . . . . . . . . . . . . . . 26		15.1. Normative References . . . . . . . . . . . . . . . . . . 26
	15.2. Informative References . . . . . . . . . . . . . . . . . 28		15.2. Informative References . . . . . . . . . . . . . . . . . 28
	skipping to change at page 4, line 26 ¶		skipping to change at page 4, line 26 ¶
	The SRv6 Capabilities sub-TLV has the following format:		The SRv6 Capabilities sub-TLV has the following format:
	0 1 2 3		0 1 2 3
	0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1		0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+		+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	| Type | Length | Flags |		| Type | Length | Flags |
	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+		+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	| optional sub-sub-TLVs...		| optional sub-sub-TLVs...
	Type: 25		Type: 25. Single octet as defined in section 9 of [ISO10589].
	Length: 2 + length of sub-sub-TLVs		Length: Single octet as defined in section 9 of [ISO10589]. The length value is
			2 + length of sub-sub-TLVs.
	Flags: 2 octets The following flags are defined:		Flags: 2 octets The following flags are defined:
	0 1		0 1
	0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5		0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+		+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	| |O| Reserved |		| |O| Reserved |
	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+		+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	where:		where:
	skipping to change at page 9, line 16 ¶		skipping to change at page 9, line 26 ¶
	The SRv6 Locator TLV has the following format:		The SRv6 Locator TLV has the following format:
	0 1 2 3		0 1 2 3
	0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1		0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+		+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	| Type | Length |R|R|R|R| MT ID |		| Type | Length |R|R|R|R| MT ID |
	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+		+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	| Locator Entries . . . |		| Locator Entries . . . |
	Type: 27		Type: 27. Single octet as defined in section 9 of [ISO10589].
	Length: variable.		Length: Single octet as defined in section 9 of [ISO10589]. The
			length value is variable.
	R bits: reserved for future use. They MUST be set to zero on		R bits: reserved for future use. They MUST be set to zero on
	transmission and MUST be ignored on receipt.		transmission and MUST be ignored on receipt.
	MT ID: Multitopology Identifier as defined in [RFC5120]. Note		MT ID: Multitopology Identifier as defined in [RFC5120]. Note
	that the value 0 is legal.		that the value 0 is legal.
	Followed by one or more locator entries of the form:		Followed by one or more locator entries of the form:
	0 1 2 3		0 1 2 3
	0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1		0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+		+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	| Metric |		| Metric |
	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+		+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	| Flags | Algorithm |		| Flags | Algorithm | Loc Size |
			+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+		+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	| Loc Size | Locator (variable)...		// Locator (continued, variable) //
	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+		+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	| Sub-TLV-len | Sub-TLVs (variable) . . . |		| Sub-TLV-len | Sub-TLVs (variable) . . . |
	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+		+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	Metric: 4 octets. As described in Section 4 of [RFC5305].		Metric: 4 octets. As described in Section 4 of [RFC5305].
	Flags: 1 octet. The following flags are defined:		Flags: 1 octet. The following flags are defined:
	0		0
	0 1 2 3 4 5 6 7		0 1 2 3 4 5 6 7
	+-+-+-+-+-+-+-+-+		+-+-+-+-+-+-+-+-+
	|D| Reserved |		|D| Reserved |
	+-+-+-+-+-+-+-+-+		+-+-+-+-+-+-+-+-+
	skipping to change at page 11, line 9 ¶		skipping to change at page 11, line 26 ¶
	document, e.g. END.T is not.		document, e.g. END.T is not.
	This new sub-TLV is advertised in the SRv6 Locator TLV defined in the		This new sub-TLV is advertised in the SRv6 Locator TLV defined in the
	previous section. SRv6 End SIDs inherit the topology/algorithm from		previous section. SRv6 End SIDs inherit the topology/algorithm from
	the parent locator.		the parent locator.
	The SRv6 End SID sub-TLV has the following format:		The SRv6 End SID sub-TLV has the following format:
	0 1 2 3		0 1 2 3
	0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1		0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	| Type | Length |
	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+		+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	| Flags | Endpoint Behavior |		| Type | Length | Flags |
			+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
			+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
			| Endpoint Behavior |
	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+		+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	| SID (128 bits) . . . |		| SID (128 bits) . . . |
	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+		+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	| SID (cont . . .) |		| SID (cont . . .) |
	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+		+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	| SID (cont . . .) |		| SID (cont . . .) |
	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+		+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	| SID (cont . . .) |		| SID (cont . . .) |
	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+		+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	|Sub-sub-TLV-len| Sub-sub-TLVs (variable) . . . |		|Sub-sub-TLV-len| Sub-sub-TLVs (variable) . . . |
	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+		+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	Type: 5.		Type: 5. Single octet as defined in section 9 of [ISO10589].
	Length: variable.		Length: Single octet as defined in section 9 of [ISO10589]. The
			length value is variable.
	Flags: 1 octet. No flags are currently defined. All bits are		Flags: 1 octet. No flags are currently defined. All bits are
	reserved for future use. They MUST be set to zero on transmission		reserved for future use. They MUST be set to zero on transmission
	and MUST be ignored on receipt.		and MUST be ignored on receipt.
	Endpoint Behavior: 2 octets, as defined in [RFC8986]. Supported		Endpoint Behavior: 2 octets, as defined in [RFC8986]. Supported
	behavior values for this sub-TLV are defined in Section 10 of this		behavior values for this sub-TLV are defined in Section 10 of this
	document. Unsupported or unrecognized behavior values are ignored		document. Unsupported or unrecognized behavior values are ignored
	by the receiver.		by the receiver.
	skipping to change at page 13, line 7 ¶		skipping to change at page 13, line 15 ¶
	8.1. SRv6 End.X SID sub-TLV		8.1. SRv6 End.X SID sub-TLV
	This sub-TLV is used to advertise an SRv6 SID associated with a point		This sub-TLV is used to advertise an SRv6 SID associated with a point
	to point adjacency. Multiple SRv6 End.X SID sub-TLVs MAY be		to point adjacency. Multiple SRv6 End.X SID sub-TLVs MAY be
	associated with the same adjacency.		associated with the same adjacency.
	The SRv6 End.X SID sub-TLV has the following format:		The SRv6 End.X SID sub-TLV has the following format:
	0 1 2 3		0 1 2 3
	0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1		0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+		+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	| Type | Length |		| Type | Length | Flags | Algorithm |
	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+		+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	| Flags | Algorithm | Weight |		| Weight | Endpoint Behavior |
	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+		+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	| Endpoint Behavior |
	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+		+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	| SID (128 bits) . . . |		| SID (128 bits) . . . |
	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+		+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	| SID (cont . . .) |		| SID (cont . . .) |
	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+		+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	| SID (cont . . .) |		| SID (cont . . .) |
	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+		+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	| SID (cont . . .) |		| SID (cont . . .) |
	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+		+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	|Sub-sub-tlv-len| Sub-sub-TLVs (variable) . . . |		|Sub-sub-tlv-len| Sub-sub-TLVs (variable) . . . |
	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+		+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	Type: 43		Type: 43. Single octet as defined in section 9 of [ISO10589].
	Length: variable.		Length: Single octet as defined in section 9 of [ISO10589]. The
			length value is variable.
	Flags: 1 octet.		Flags: 1 octet.
	0 1 2 3 4 5 6 7		0 1 2 3 4 5 6 7
	+-+-+-+-+-+-+-+-+		+-+-+-+-+-+-+-+-+
	|B|S|P|Reserved |		|B|S|P|Reserved |
	+-+-+-+-+-+-+-+-+		+-+-+-+-+-+-+-+-+
	where:		where:
	skipping to change at page 15, line 14 ¶		skipping to change at page 15, line 14 ¶
	0 1 2 3		0 1 2 3
	0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1		0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+		+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	| Type | Length | |		| Type | Length | |
	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |		+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
	| Neighbor System-ID (ID length octets) |		| Neighbor System-ID (ID length octets) |
	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+		+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	| Flags | Algorithm | Weight |		| Flags | Algorithm | Weight |
	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+		+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
			+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	| Endpoint Behavior |		| Endpoint Behavior |
	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+		+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	| SID (128 bits) . . . |		| SID (128 bits) . . . |
	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+		+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	| SID (cont . . .) |		| SID (cont . . .) |
	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+		+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	| SID (cont . . .) |		| SID (cont . . .) |
	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+		+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	| SID (cont . . .) |		| SID (cont . . .) |
	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+		+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	|Sub-sub-TLV-len| sub-sub-TLVs (variable) . . . |		|Sub-sub-TLV-len| sub-sub-TLVs (variable) . . . |
	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+		+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	Type: 44		Type: 44. Single octet as defined in section 9 of [ISO10589].
	Length: variable.		Length: Single octet as defined in section 9 of [ISO10589]. The
			length value is variable.
	Neighbor System-ID: IS-IS System-ID of length "ID Length" as		Neighbor System-ID: IS-IS System-ID of length "ID Length" as
	defined in [ISO10589].		defined in [ISO10589].
	Flags: 1 octet.		Flags: 1 octet.
	0 1 2 3 4 5 6 7		0 1 2 3 4 5 6 7
	+-+-+-+-+-+-+-+-+		+-+-+-+-+-+-+-+-+
	|B|S|P|Reserved |		|B|S|P|Reserved |
	+-+-+-+-+-+-+-+-+		+-+-+-+-+-+-+-+-+
	skipping to change at page 16, line 50 ¶		skipping to change at page 16, line 50 ¶
	0 1 2 3		0 1 2 3
	0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1		0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+		+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	| Type | Length |		| Type | Length |
	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+		+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	| LB Length | LN Length | Fun. Length | Arg. Length |		| LB Length | LN Length | Fun. Length | Arg. Length |
	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+		+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	where:		where:
	Type: 1		Type: 1. Single octet as defined in section 9 of [ISO10589].
	Length: 4 octets.		Length: Single octet as defined in section 9 of [ISO10589]. The
			length value is 4 octets.
	LB Length: 1 octet. SRv6 SID Locator Block length in bits.		LB Length: 1 octet. SRv6 SID Locator Block length in bits.
	LN Length: 1 octet. SRv6 SID Locator Node length in bits.		LN Length: 1 octet. SRv6 SID Locator Node length in bits.
	Fun. Length: 1 octet. SRv6 SID Function length in bits.		Fun. Length: 1 octet. SRv6 SID Function length in bits.
	Arg. Length: 1 octet. SRv6 SID Arguments length in bits.		Arg. Length: 1 octet. SRv6 SID Arguments length in bits.
	ISIS SRv6 SID Structure Sub-Sub-TLV MUST NOT appear more than once in		ISIS SRv6 SID Structure Sub-Sub-TLV MUST NOT appear more than once in
	skipping to change at page 17, line 46 ¶		skipping to change at page 17, line 49 ¶
	in Section 5 of [RFC8754].		in Section 5 of [RFC8754].
	The details of these potential applications are outside the scope of		The details of these potential applications are outside the scope of
	this document.		this document.
	10. Advertising Endpoint Behaviors		10. Advertising Endpoint Behaviors
	Endpoint behaviors are defined in [RFC8986]. The codepoints for the		Endpoint behaviors are defined in [RFC8986]. The codepoints for the
	Endpoint behaviors are defined in the "SRv6 Endpoint Behaviors"		Endpoint behaviors are defined in the "SRv6 Endpoint Behaviors"
	registry defined in [RFC8986]. If a behavior is advertised it MUST		registry defined in [RFC8986]. If a behavior is advertised it MUST
	only be advertised in the TLV[s] as indicated by "Y" in the table		only be advertised in the TLV[s] marked with "Y" in the table below,
	below, and MUST NOT be advertised in the TLV[s] as indicated by "N"		and MUST NOT be advertised in the TLV[s] marked with "N" in the table
	in the table below.		below.
	Endpoint |Endpoint | End | End.X | Lan End.X |		Endpoint |Endpoint | End | End.X | Lan End.X |
	Behavior |Behavior Codepoint| SID | SID | SID |		Behavior |Behavior Codepoint| SID | SID | SID |
	----------------------|------------------|-----|-------|-----------|		----------------------|------------------|-----|-------|-----------|
	End (PSP, USP, USD)| 1-4, 28-31 | Y | N | N |		End (PSP, USP, USD)| 1-4, 28-31 | Y | N | N |
	----------------------|------------------|-----|-------|-----------|		----------------------|------------------|-----|-------|-----------|
	End.X (PSP, USP, USD)| 5-8, 32-35 | N | Y | Y |		End.X (PSP, USP, USD)| 5-8, 32-35 | N | Y | Y |
	----------------------|------------------|-----|-------|-----------|		----------------------|------------------|-----|-------|-----------|
	End.DX6 | 16 | N | Y | Y |		End.DX6 | 16 | N | Y | Y |
	----------------------|------------------|-----|-------|-----------|		----------------------|------------------|-----|-------|-----------|
	skipping to change at page 20, line 14 ¶		skipping to change at page 20, line 14 ¶
	11.3. Sub-Sub-TLVs of the SRv6 Capability sub-TLV		11.3. Sub-Sub-TLVs of the SRv6 Capability sub-TLV
	This document requests a new IANA registry be created under the IS-IS		This document requests a new IANA registry be created under the IS-IS
	TLV Codepoints Registry to control the assignment of sub-TLV types		TLV Codepoints Registry to control the assignment of sub-TLV types
	for the SRv6 Capability sub-TLV specified in this document -		for the SRv6 Capability sub-TLV specified in this document -
	Section 2. The suggested name of the new registry is "sub-sub-TLVs		Section 2. The suggested name of the new registry is "sub-sub-TLVs
	of the SRv6 Capability sub-TLV". The registration procedure is		of the SRv6 Capability sub-TLV". The registration procedure is
	"Expert Review" as defined in [RFC8126]. Guidance for the Designated		"Expert Review" as defined in [RFC8126]. Guidance for the Designated
	Experts is provided in the [RFC7370]. No sub-sub-TLVs are defined by		Experts is provided in the [RFC7370]. No sub-sub-TLVs are defined by
	this document except for the reserved value.		this document except for the reserved type 0.
	0: Reserved
	1-255: Unassigned		Type Description Encoding
			Reference
			---------------------------------------------------------
			0 Reserved
			1-255 Unassigned
	11.4. SRv6 End.X SID and SRv6 LAN End.X SID sub-TLVs		11.4. SRv6 End.X SID and SRv6 LAN End.X SID sub-TLVs
	This document makes the following registrations in the "Sub-TLVs for		This document makes the following registrations in the "Sub-TLVs for
	TLVs 22, 23, 25, 141, 222, and 223 (Extended IS reachability, IS		TLVs 22, 23, 25, 141, 222, and 223 (Extended IS reachability, IS
	Neighbor Attribute, L2 Bundle Member Attributes, inter-AS		Neighbor Attribute, L2 Bundle Member Attributes, inter-AS
	reachability information, MT-ISN, and MT IS Neighbor Attribute TLVs)"		reachability information, MT-ISN, and MT IS Neighbor Attribute TLVs)"
	registry:		registry:
	Type: 43		Type: 43
	skipping to change at page 21, line 18 ¶		skipping to change at page 21, line 18 ¶
	42 SRH Max End Pop [This Document]		42 SRH Max End Pop [This Document]
	44 SRH Max H.encaps [This Document]		44 SRH Max H.encaps [This Document]
	45 SRH Max End D [This Document]		45 SRH Max End D [This Document]
	11.6. Sub-Sub-TLVs for SID Sub-TLVs		11.6. Sub-Sub-TLVs for SID Sub-TLVs
	This document requests a new IANA registry be created under the IS-IS		This document requests a new IANA registry be created under the IS-IS
	TLV Codepoints Registry to control the assignment of sub-TLV types		TLV Codepoints Registry to control the assignment of sub-TLV types
	for the SID Sub-TLVs specified in this document - Section 7.2,		for the SID Sub-TLVs specified in this document - Section 7.2,
	Section 8.1, Section 8.2. The suggested name of the new registry is		Section 8.1, Section 8.2. The suggested name of the new registry is
	"sub-sub-TLVs for SRv6 End SID (5) (sub-TLV of TLVs 27, 135, 235, 236		"sub-sub-TLVs for SRv6 End SID and SRv6 End.X SID". The registration
	and 237) and SRv6 End.X SID (43)/SRv6 LAN End.X SID (44) (Sub-TLVs		procedure is "Expert Review" as defined in [RFC8126]. Guidance for
	for TLVs 22, 23, 25, 141, 222, and 223)". The registration procedure		the Designated Experts is provided in [RFC7370]. The following
	is "Expert Review" as defined in [RFC8126]. Guidance for the
	Designated Experts is provided in [RFC7370]. The following
	assignments are made by this document:		assignments are made by this document:
	Type Description Encoding		Type Description Encoding
	Reference		Reference
	---------------------------------------------------------		---------------------------------------------------------
	0 Reserved		0 Reserved
	1 SRv6 SID Structure Sub-Sub-TLV [This Document]		1 SRv6 SID Structure Sub-Sub-TLV [This Document]
	2-255 Unassigned		2-255 Unassigned
	Type 5 43 44		Type 5 43 44
	skipping to change at page 22, line 22 ¶		skipping to change at page 22, line 15 ¶
	is "Expert Review" as defined in [RFC8126]. Guidance for the		is "Expert Review" as defined in [RFC8126]. Guidance for the
	Designated Experts is provided in [RFC7370]. The following		Designated Experts is provided in [RFC7370]. The following
	assignments are made by this document:		assignments are made by this document:
	Bit #: 1		Bit #: 1
	Description: O-flag		Description: O-flag
	Reference: This document (Section 2).		Reference: This document (Section 2).
			Bit #: 0, 2-7
			Description: Unassigned
	11.9. ISIS SRv6 Locator TLV Flags Registry		11.9. ISIS SRv6 Locator TLV Flags Registry
	This document requests a new IANA registry be created under the IS-IS		This document requests a new IANA registry be created under the IS-IS
	TLV Codepoints Registry to control the assignment of bits 0 to 7 in		TLV Codepoints Registry to control the assignment of bits 0 to 7 in
	the Flags field of the ISIS SRv6 Locator TLV specified in this		the Flags field of the ISIS SRv6 Locator TLV specified in this
	document (Section 7.1). The suggested name of the new registry is		document (Section 7.1). The suggested name of the new registry is
	"ISIS SRv6 Locator TLV Flags". The registration procedure is "Expert		"ISIS SRv6 Locator TLV Flags". The registration procedure is "Expert
	Review" as defined in [RFC8126]. Guidance for the Designated Experts		Review" as defined in [RFC8126]. Guidance for the Designated Experts
	is provided in [RFC7370]. The following assignments are made by this		is provided in [RFC7370]. The following assignments are made by this
	document:		document:
	Bit #: 0		Bit #: 0
	Description: D-flag		Description: D-flag
	Reference: This document (Section 7.1).		Reference: This document (Section 7.1).
			Bit #: 1-7
			Description: Unassigned
	11.10. ISIS SRv6 End SID sub-TLV Flags Registry		11.10. ISIS SRv6 End SID sub-TLV Flags Registry
	This document requests a new IANA registry be created under the IS-IS		This document requests a new IANA registry be created under the IS-IS
	TLV Codepoints Registry to control the assignment of bits 0 to 7 in		TLV Codepoints Registry to control the assignment of bits 0 to 7 in
	the Flags field of the ISIS SRv6 End SID sub-TLV specified in this		the Flags field of the ISIS SRv6 End SID sub-TLV specified in this
	document (Section 7.2). The suggested name of the new registry is		document (Section 7.2). The suggested name of the new registry is
	"ISIS SRv6 End SID sub-TLV Flags". The registration procedure is		"ISIS SRv6 End SID sub-TLV Flags". The registration procedure is
	"Expert Review" as defined in [RFC8126]. Guidance for the Designated		"Expert Review" as defined in [RFC8126]. Guidance for the Designated
	Experts is provided in [RFC7370]. No assignments are made by this		Experts is provided in [RFC7370]. No assignments are made by this
	document.		document.
			Bit #: 0-7
			Description: Unassigned
	11.11. ISIS SRv6 End.X SID and LAN End.X SID sub-TLVs Flags Registry		11.11. ISIS SRv6 End.X SID and LAN End.X SID sub-TLVs Flags Registry
	This document requests a new IANA registry be created under the IS-IS		This document requests a new IANA registry be created under the IS-IS
	TLV Codepoints Registry to control the assignment of bits 0 to 7 in		TLV Codepoints Registry to control the assignment of bits 0 to 7 in
	the Flags field of the ISIS SRv6 End.X SID and LAN End.X SID sub-TLVs		the Flags field of the ISIS SRv6 End.X SID and LAN End.X SID sub-TLVs
	(Section 8.1 and Section 8.2). The suggested name of the new		(Section 8.1 and Section 8.2). The suggested name of the new
	registry is "ISIS SRv6 End.X SID and LAN End.X SID sub-TLVs Flags".		registry is "ISIS SRv6 End.X SID and LAN End.X SID sub-TLVs Flags".
	The registration procedure is "Expert Review" as defined in		The registration procedure is "Expert Review" as defined in
	[RFC8126]. Guidance for the Designated Experts is provided in		[RFC8126]. Guidance for the Designated Experts is provided in
	[RFC7370]. The following assignments are made by this document:		[RFC7370]. The following assignments are made by this document:
	skipping to change at page 23, line 34 ¶		skipping to change at page 23, line 35 ¶
	Description: S-flag		Description: S-flag
	Reference: This document (Section 8.1).		Reference: This document (Section 8.1).
	Bit #: 2		Bit #: 2
	Description: P-flag		Description: P-flag
	Reference: This document (Section 8.1).		Reference: This document (Section 8.1).
			Bit #: 3-7
			Description: Unassigned
	12. Security Considerations		12. Security Considerations
	Security concerns for IS-IS are addressed in [ISO10589], [RFC5304],		Security concerns for IS-IS are addressed in [ISO10589], [RFC5304],
	and [RFC5310]. While IS-IS is deployed under a single administrative		and [RFC5310]. While IS-IS is deployed under a single administrative
	domain, there can be deployments where potential attackers have		domain, there can be deployments where potential attackers have
	access to one or more networks in the IS-IS routing domain. In these		access to one or more networks in the IS-IS routing domain. In these
	deployments, the stronger authentication mechanisms defined in the		deployments, the stronger authentication mechanisms defined in the
	aforementioned documents SHOULD be used.		aforementioned documents SHOULD be used.
	This document describes the IS-IS extensions required to support		This document describes the IS-IS extensions required to support
	skipping to change at page 26, line 13 ¶		skipping to change at page 26, line 13 ¶
	Thanks to Alvaro Retana and John Scudder for AD review and comments.		Thanks to Alvaro Retana and John Scudder for AD review and comments.
	15. References		15. References
	15.1. Normative References		15.1. Normative References
	[I-D.ietf-6man-spring-srv6-oam]		[I-D.ietf-6man-spring-srv6-oam]
	Ali, Z., Filsfils, C., Matsushima, S., Voyer, D., and M.		Ali, Z., Filsfils, C., Matsushima, S., Voyer, D., and M.
	Chen, "Operations, Administration, and Maintenance (OAM)		Chen, "Operations, Administration, and Maintenance (OAM)
	in Segment Routing Networks with IPv6 Data plane (SRv6)",		in Segment Routing Networks with IPv6 Data plane (SRv6)",
	draft-ietf-6man-spring-srv6-oam-10 (work in progress),		draft-ietf-6man-spring-srv6-oam-11 (work in progress),
	April 2021.		June 2021.
	[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-15 (work in progress), April 2021.		algo-17 (work in progress), July 2021.
	[ISO10589]		[ISO10589]
	International Organization for Standardization,		International Organization for Standardization,
	"Intermediate system to Intermediate system intra-domain		"Intermediate system to Intermediate system intra-domain
	routeing information exchange protocol for use in		routeing information exchange protocol for use in
	conjunction with the protocol for providing the		conjunction with the protocol for providing the
	connectionless-mode Network Service (ISO 8473)", Nov 2002.		connectionless-mode Network Service (ISO 8473)", Nov 2002.
	[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,
End of changes. 39 change blocks.
	48 lines changed or deleted		74 lines changed or added
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