draft-ietf-lsr-isis-srv6-extensions-06.txt		draft-ietf-lsr-isis-srv6-extensions-07.txt
	Networking Working Group P. Psenak, Ed.		Networking Working Group P. Psenak, Ed.
	Internet-Draft C. Filsfils		Internet-Draft C. Filsfils
	Intended status: Standards Track Cisco Systems		Intended status: Standards Track Cisco Systems
	Expires: September 4, 2020 A. Bashandy		Expires: September 24, 2020 A. Bashandy
	Individual		Individual
	B. Decraene		B. Decraene
	Orange		Orange
	Z. Hu		Z. Hu
	Huawei Technologies		Huawei Technologies
	March 3, 2020		March 23, 2020
	IS-IS Extension to Support Segment Routing over IPv6 Dataplane		IS-IS Extension to Support Segment Routing over IPv6 Dataplane
	draft-ietf-lsr-isis-srv6-extensions-06.txt		draft-ietf-lsr-isis-srv6-extensions-07.txt
	Abstract		Abstract
	Segment Routing (SR) allows for a flexible definition of end-to-end		Segment Routing (SR) allows for a flexible definition of end-to-end
	paths by encoding paths as sequences of topological sub-paths, called		paths by encoding paths as sequences of topological sub-paths, called
	"segments". Segment routing architecture can be implemented over an		"segments". Segment routing architecture can be implemented over an
	MPLS data plane as well as an IPv6 data plane. This draft describes		MPLS data plane as well as an IPv6 data plane. This draft describes
	the IS-IS extensions required to support Segment Routing over an IPv6		the IS-IS extensions required to support Segment Routing over an IPv6
	data plane.		data plane.
	skipping to change at page 1, line 49 ¶		skipping to change at page 1, line 49 ¶
	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 September 4, 2020.		This Internet-Draft will expire on September 24, 2020.
	Copyright Notice		Copyright Notice
	Copyright (c) 2020 IETF Trust and the persons identified as the		Copyright (c) 2020 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 2, line 38 ¶		skipping to change at page 2, line 38 ¶
	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 . . . . . . . . . . . . . . . . 7
	7. Advertising Locators and End SIDs . . . . . . . . . . . . . . 8		7. Advertising Locators and End SIDs . . . . . . . . . . . . . . 8
	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 . . . . . . . . . . . . . . . . . . 10
	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 . . . . . . . . . . . . . . . . . 12
	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 . . . . . . . . . . . . . . . 15		9. SRv6 SID Structure Sub-Sub-TLV . . . . . . . . . . . . . . . 16
	10. Advertising Endpoint Behaviors . . . . . . . . . . . . . . . 16		10. Advertising Endpoint Behaviors . . . . . . . . . . . . . . . 17
	11. Implementation Status . . . . . . . . . . . . . . . . . . . . 17		11. Implementation Status . . . . . . . . . . . . . . . . . . . . 18
	11.1. Cisco . . . . . . . . . . . . . . . . . . . . . . . . . 17		11.1. Cisco . . . . . . . . . . . . . . . . . . . . . . . . . 18
	11.2. Huawei . . . . . . . . . . . . . . . . . . . . . . . . . 17		11.2. Huawei . . . . . . . . . . . . . . . . . . . . . . . . . 18
	11.3. Juniper . . . . . . . . . . . . . . . . . . . . . . . . 18		11.3. Juniper . . . . . . . . . . . . . . . . . . . . . . . . 18
	11.4. Interoperability Testing. . . . . . . . . . . . . . . . 18		11.4. Interoperability Testing. . . . . . . . . . . . . . . . 18
	12. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 18		12. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 19
	12.1. SRv6 Locator TLV . . . . . . . . . . . . . . . . . . . . 18		12.1. SRv6 Locator TLV . . . . . . . . . . . . . . . . . . . . 19
	12.1.1. SRv6 End SID sub-TLV . . . . . . . . . . . . . . . . 18		12.1.1. SRv6 End SID sub-TLV . . . . . . . . . . . . . . . . 19
	12.1.2. Revised sub-TLV table . . . . . . . . . . . . . . . 19		12.1.2. Revised sub-TLV table . . . . . . . . . . . . . . . 19
	12.2. SRv6 Capabilities sub-TLV . . . . . . . . . . . . . . . 19		12.2. SRv6 Capabilities sub-TLV . . . . . . . . . . . . . . . 19
	12.3. SRv6 End.X SID and SRv6 LAN End.X SID sub-TLVs . . . . . 19		12.3. SRv6 End.X SID and SRv6 LAN End.X SID sub-TLVs . . . . . 20
	12.4. MSD Types . . . . . . . . . . . . . . . . . . . . . . . 20		12.4. MSD Types . . . . . . . . . . . . . . . . . . . . . . . 20
	12.5. Sub-Sub-TLVs for SID Sub-TLVs . . . . . . . . . . . . . 20		12.5. Sub-Sub-TLVs for SID Sub-TLVs . . . . . . . . . . . . . 21
	12.6. Prefix Attribute Flags Sub-TLV . . . . . . . . . . . . . 20		12.6. Prefix Attribute Flags Sub-TLV . . . . . . . . . . . . . 21
	13. Security Considerations . . . . . . . . . . . . . . . . . . . 21		13. Security Considerations . . . . . . . . . . . . . . . . . . . 21
	14. Contributors . . . . . . . . . . . . . . . . . . . . . . . . 21		14. Contributors . . . . . . . . . . . . . . . . . . . . . . . . 21
	15. References . . . . . . . . . . . . . . . . . . . . . . . . . 22		15. References . . . . . . . . . . . . . . . . . . . . . . . . . 22
	15.1. Normative References . . . . . . . . . . . . . . . . . . 22		15.1. Normative References . . . . . . . . . . . . . . . . . . 22
	15.2. Informative References . . . . . . . . . . . . . . . . . 24		15.2. Informative References . . . . . . . . . . . . . . . . . 24
	15.3. URIs . . . . . . . . . . . . . . . . . . . . . . . . . . 25		15.3. URIs . . . . . . . . . . . . . . . . . . . . . . . . . . 25
	Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 25		Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 25
	1. Introduction		1. Introduction
	skipping to change at page 6, line 41 ¶		skipping to change at page 6, line 41 ¶
	As discussed in [I-D.ietf-spring-srv6-network-programming], an SRv6		As discussed in [I-D.ietf-spring-srv6-network-programming], an SRv6
	Segment Identifier (SID) is 128 bits and consists of Locator,		Segment Identifier (SID) is 128 bits and consists of Locator,
	Function and Argument parts.		Function and Argument parts.
	A node is provisioned with topology/algorithm specific locators for		A node is provisioned with topology/algorithm specific locators for
	each of the topology/algorithm pairs supported by that node. Each		each of the topology/algorithm pairs supported by that node. Each
	locator is a covering prefix for all SIDs provisioned on that node		locator is a covering prefix for all SIDs provisioned on that node
	which have the matching topology/algorithm.		which have the matching topology/algorithm.
	Locators MUST be advertised in the SRv6 Locator TLV (see		Locators MUST be advertised in the SRv6 Locator TLV (see
	Section 6.1). Forwarding entries for the locators advertised in the		Section 7.1). Forwarding entries for the locators advertised in the
	SRv6 Locator TLV MUST be installed in the forwarding plane of		SRv6 Locator TLV MUST be installed in the forwarding plane of
	receiving SRv6 capable routers when the associated topology/algorithm		receiving SRv6 capable routers when the associated topology/algorithm
	is supported by the receiving node.		is supported by the receiving node.
	Locators are routable and MAY also be advertised in Prefix		Locators are routable and MAY also be advertised in Prefix
	Reachability TLVs (236 or 237).		Reachability TLVs (236 or 237).
	Locators associated with Flexible Algorithms [I-D.ietf-lsr-flex-algo]		Locators associated with Flexible Algorithms [I-D.ietf-lsr-flex-algo]
	SHOULD NOT be advertised in Prefix Reachability TLVs (236 or 237).		SHOULD NOT be advertised in Prefix Reachability TLVs (236 or 237).
	skipping to change at page 10, line 30 ¶		skipping to change at page 10, line 30 ¶
	Optional sub-TLVs.		Optional sub-TLVs.
	7.2. SRv6 End SID sub-TLV		7.2. SRv6 End SID sub-TLV
	The SRv6 End SID sub-TLV is introduced to advertise SRv6 Segment		The SRv6 End SID sub-TLV is introduced to advertise SRv6 Segment
	Identifiers (SID) with Endpoint behaviors which do not require a		Identifiers (SID) with Endpoint behaviors which do not require a
	particular neighbor in order to be correctly applied		particular neighbor in order to be correctly applied
	[I-D.ietf-spring-srv6-network-programming]. SRv6 SIDs associated		[I-D.ietf-spring-srv6-network-programming]. SRv6 SIDs associated
	with a neighbor are advertised using the sub-TLVs defined in		with a neighbor are advertised using the sub-TLVs defined in
	Section 6.		Section 8.
	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 |		| Type | Length |
	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+		+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	| Flags | Endpoint Behavior |		| 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 (Suggested value to be assigned by IANA)		Type: 5 (Suggested value to be assigned by IANA).
	Length: variable.		Length: variable.
	Flags: 1 octet. No flags are currently defined.		Flags: 1 octet. No flags are currently defined.
	Endpoint Behavior: 2 octets, as defined in [I-D.ietf-spring-srv6-network-programming].		Endpoint Behavior: 2 octets, as defined in [I-D.ietf-spring-srv6-
	Legal behavior values for this sub-TLV are defined in Section 9 of this document.		network-programming]. Legal behavior values for this sub-TLV are
			defined in Section 10 of this document.
	SID: 16 octets. This field encodes the advertised SRv6 SID.		SID: 16 octets. This field encodes the advertised SRv6 SID.
	Sub-sub-TLV-length: 1 octet. Number of octets used by sub-sub-TLVs		Sub-sub-TLV-length: 1 octet. Number of octets used by sub-sub-
			TLVs.
	Optional sub-sub-TLVs		Optional sub-sub-TLVs.
	The SRv6 End SID MUST be a subnet of the associated Locator. SRv6		The SRv6 End SID MUST be a subnet of the associated Locator. SRv6
	End SIDs which are NOT a subnet of the associated locator MUST be		End SIDs which are NOT a subnet of the associated locator MUST be
	ignored.		ignored.
	Multiple SRv6 End SIDs MAY be associated with the same locator. In		Multiple SRv6 End SIDs MAY be associated with the same locator. In
	cases where the number of SRv6 End SID sub-TLVs exceeds the capacity		cases where the number of SRv6 End SID sub-TLVs exceeds the capacity
	of a single TLV, multiple Locator TLVs for the same locator MAY be		of a single TLV, multiple Locator TLVs for the same locator MAY be
	advertised. For a given MTID/Locator the algorithm MUST be the same		advertised. For a given MTID/Locator the algorithm MUST be the same
	in all TLVs. If this restriction is not met all TLVs for that MTID/		in all TLVs. If this restriction is not met all TLVs for that MTID/
	skipping to change at page 13, line 11 ¶		skipping to change at page 13, line 25 ¶
	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+		+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	| 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 (Suggested value to be assigned by IANA)		Type: 43 (Suggested value to be assigned by IANA).
	Length: variable.		Length: 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:
	B-Flag: Backup flag. If set, the End.X SID is eligible		B-Flag: Backup flag. If set, the End.X SID is eligible for
	for protection (e.g., using IPFRR) as described in [RFC8355].		protection (e.g., using IPFRR) as described in [RFC8355].
	S-Flag. Set flag. When set, the S-Flag indicates that the		S-Flag. Set flag. When set, the S-Flag indicates that the
	End.X SID refers to a set of adjacencies (and therefore		End.X SID refers to a set of adjacencies (and therefore MAY be
	MAY be assigned to other adjacencies as well).		assigned to other adjacencies as well).
	P-Flag. Persistent flag. When set, the P-Flag indicates that		P-Flag. Persistent flag. When set, the P-Flag indicates that
	the End.X SID is persistently allocated, i.e., the		the End.X SID is persistently allocated, i.e., the End.X SID
	End.X SID value remains consistent across router restart		value remains consistent across router restart and/or interface
	and/or interface flap.		flap.
	Other bits: MUST be zero when originated and ignored when		Other bits: MUST be zero when originated and ignored when
	received.		received.
	Algorithm: 1 octet. Associated algorithm. Algorithm values		Algorithm: 1 octet. Associated algorithm. Algorithm values are
	are defined in the IGP Algorithm Type registry.		defined in the IGP Algorithm Type registry.
	Weight: 1 octet. The value represents the weight of the		Weight: 1 octet. The value represents the weight of the End.X SID
	End.X SID for the purpose of load balancing. The use		for the purpose of load balancing. The use of the weight is
	of the weight is defined in [I-D.ietf-spring-segment-routing].		defined in [I-D.ietf-spring-segment-routing].
	Endpoint Behavior: 2 octets. As defined in		Endpoint Behavior: 2 octets. As defined in [I-D.ietf-spring-srv6-
	[I-D.ietf-spring-srv6-network-programming]		network-programming] Legal behavior values for this sub-TLV are
	Legal behavior values for this sub-TLV are defined in Section 9.		defined in Section 10.
	SID: 16 octets. This field encodes the advertised SRv6 SID.		SID: 16 octets. This field encodes the advertised SRv6 SID.
	Sub-sub-TLV-length: 1 octet. Number of octets used by sub-sub-		Sub-sub-TLV-length: 1 octet. Number of octets used by sub-sub-
	TLVs		TLVs.
	Note that multiple TLVs for the same neighbor may be required in		Note that multiple TLVs for the same neighbor may be required in
	order to advertise all of the SRv6 End.X SIDs associated with that		order to advertise all of the SRv6 End.X SIDs associated with that
	neighbor.		neighbor.
	8.2. SRv6 LAN End.X SID sub-TLV		8.2. SRv6 LAN End.X SID sub-TLV
	This sub-TLV is used to advertise an SRv6 SID associated with a LAN		This sub-TLV is used to advertise an SRv6 SID associated with a LAN
	adjacency. Since the parent TLV is advertising an adjacency to the		adjacency. Since the parent TLV is advertising an adjacency to the
	Designated Intermediate System(DIS) for the LAN, it is necessary to		Designated Intermediate System(DIS) for the LAN, it is necessary to
	skipping to change at page 14, line 48 ¶		skipping to change at page 15, line 27 ¶
	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+		+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	| 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 (Suggested value to be assigned by IANA)		Type: 44 (Suggested value to be assigned by IANA).
	Length: variable.
	System-ID: 6 octets of IS-IS System-ID of length "ID Length" as		Length: variable.
	defined in [ISO10589].
	Flags: 1 octet.		System-ID: 6 octets of IS-IS System-ID of length "ID Length" as
			defined in [ISO10589].
			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 B,S, and P flags are as described in Section 8.1.		where B,S, and P flags are as described in Section 8.1. Other
	Other bits: MUST be zero when originated and ignored when		bits: MUST be zero when originated and ignored when received.
	received.
	Algorithm: 1 octet. Associated algorithm. Algorithm values		Algorithm: 1 octet. Associated algorithm. Algorithm values are
	are defined in the IGP Algorithm Type registry.		defined in the IGP Algorithm Type registry.
	Weight: 1 octet. The value represents the weight of the		Weight: 1 octet. The value represents the weight of the End.X SID
	End.X SID for the purpose of load balancing. The use		for the purpose of load balancing. The use of the weight is
	of the weight is defined in [I-D.ietf-spring-segment-routing].		defined in [I-D.ietf-spring-segment-routing].
	Endpoint Behavior: 2 octets. As defined in		Endpoint Behavior: 2 octets. As defined in [I-D.ietf-spring-srv6-
	[I-D.ietf-spring-srv6-network-programming]		network-programming] Legal behavior values for this sub-TLV are
	Legal behavior values for this sub-TLV are defined in Section 9.		defined in Section 10.
	SID: 16 octets. This field encodes the advertised SRv6 SID.		SID: 16 octets. This field encodes the advertised SRv6 SID.
	Sub-sub-TLV-length: 1 octet. Number of octets used by sub-sub-		Sub-sub-TLV-length: 1 octet. Number of octets used by sub-sub-
	TLVs.		TLVs.
	9. SRv6 SID Structure Sub-Sub-TLV		9. SRv6 SID Structure Sub-Sub-TLV
	SRv6 SID Structure Sub-Sub-TLV is an optional Sub-Sub-TLV of:		SRv6 SID Structure Sub-Sub-TLV is an optional Sub-Sub-TLV of:
	SRv6 End SID Sub-TLV (Section 7.2)		SRv6 End SID Sub-TLV (Section 7.2)
	SRv6 End.X SID Sub-TLV (Section 8.1)		SRv6 End.X SID Sub-TLV (Section 8.1)
	SRv6 LAN End.X SID Sub-TLV (Section 8.2)		SRv6 LAN End.X SID Sub-TLV (Section 8.2)
	skipping to change at page 16, line 43 ¶		skipping to change at page 17, line 21 ¶
	sizes advertised in the ISIS SRv6 SID Structure Sub-Sub-TLV is larger		sizes advertised in the ISIS SRv6 SID Structure Sub-Sub-TLV is larger
	than 128 bits, the parent Sub-TLV MUST be ignored by the receiver.		than 128 bits, the parent Sub-TLV MUST be ignored by the receiver.
	10. Advertising Endpoint Behaviors		10. Advertising Endpoint Behaviors
	Endpoint behaviors are defined in		Endpoint behaviors are defined in
	[I-D.ietf-spring-srv6-network-programming] and		[I-D.ietf-spring-srv6-network-programming] and
	[I-D.ietf-6man-spring-srv6-oam]. The codepoints for the Endpoint		[I-D.ietf-6man-spring-srv6-oam]. The codepoints for the Endpoint
	behaviors are defined in the "SRv6 Endpoint Behaviors" registry		behaviors are defined in the "SRv6 Endpoint Behaviors" registry
	defined in [I-D.ietf-spring-srv6-network-programming]. This section		defined in [I-D.ietf-spring-srv6-network-programming]. This section
	lists the Endpoint behaviors and their codepoints, which MAY be		lists the Endpoint behaviors which MAY be advertised by ISIS,
	advertised by IS-IS and the SID sub-TLVs in which each type MAY		together with their codepoints. If this behavior is advertised it
	appear.		MUST only be advertised in the TLV[s] as indicated by "Y" in the
			table below, and MUST NOT be advertised in the TLV[s] as indicated by
			"N" in the table 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.T (PSP, USP, USD) | 9-12, 36-39 | Y | N | N |		End.T (PSP, USP, USD) | 9-12, 36-39 | Y | N | N |
	-----------------------|--------------------|-------|-------|-----------|		-----------------------|--------------------|-------|-------|-----------|
	skipping to change at page 17, line 49 ¶		skipping to change at page 18, line 26 ¶
	Intra/Inter area/level support: Yes		Intra/Inter area/level support: Yes
	Anycast SID support: Yes, including A-flag (Section 6)		Anycast SID support: Yes, including A-flag (Section 6)
	SID Structure Sub-Sub-TLV: Yes		SID Structure Sub-Sub-TLV: Yes
	11.2. Huawei		11.2. Huawei
	Huawei's ISIS SRv6 implementation supports following functionalities:		Huawei's ISIS SRv6 implementation supports following functionalities:
	Types of SID supported: End, End.X		Types of SID supported: End, End.X, LAN End.X
	Intra/Inter area/level support: Yes		Intra/Inter area/level support: Yes
	Anycast SID support: Yes, no A-flag support (Section 6)		Anycast SID support: Yes, no A-flag support (Section 6)
	SID Structure Sub-Sub-TLV: No		SID Structure Sub-Sub-TLV: No
	11.3. Juniper		11.3. Juniper
	Juniper's ISIS SRv6 implementation supports following		Juniper's ISIS SRv6 implementation supports following
	functionalities:		functionalities:
	skipping to change at page 23, line 21 ¶		skipping to change at page 23, line 21 ¶
	[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-03 (work in progress),		draft-ietf-6man-spring-srv6-oam-03 (work in progress),
	December 2019.		December 2019.
	[I-D.ietf-spring-srv6-network-programming]		[I-D.ietf-spring-srv6-network-programming]
	Filsfils, C., Camarillo, P., Leddy, J., Voyer, D.,		Filsfils, C., Camarillo, P., Leddy, J., Voyer, D.,
	Matsushima, S., and Z. Li, "SRv6 Network Programming",		Matsushima, S., and Z. Li, "SRv6 Network Programming",
	draft-ietf-spring-srv6-network-programming-11 (work in		draft-ietf-spring-srv6-network-programming-14 (work in
	progress), March 2020.		progress), March 2020.
	[ISO10589]		[ISO10589]
	Standardization", I. ". O. F., "Intermediate system to		Standardization", I. ". O. F., "Intermediate system to
	Intermediate system intra-domain routeing information		Intermediate system intra-domain routeing information
	exchange protocol for use in conjunction with the protocol		exchange protocol for use in conjunction with the protocol
	for providing the connectionless-mode Network Service (ISO		for providing the connectionless-mode Network Service (ISO
	8473), ISO/IEC 10589:2002, Second Edition.", Nov 2002.		8473), ISO/IEC 10589:2002, Second Edition.", Nov 2002.
	[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate		[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
End of changes. 43 change blocks.
	92 lines changed or deleted		97 lines changed or added
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