draft-ietf-isis-segment-routing-msd-12.txt		draft-ietf-isis-segment-routing-msd-13.txt
	IS-IS Working Group J. Tantsura		IS-IS Working Group J. Tantsura
	Internet-Draft Nuage Networks		Internet-Draft Nuage Networks
	Intended status: Standards Track U. Chunduri		Intended status: Standards Track U. Chunduri
	Expires: November 17, 2018 Huawei Technologies		Expires: January 25, 2019 Huawei Technologies
	S. Aldrin		S. Aldrin
	Google, Inc		Google, Inc
	L. Ginsberg		L. Ginsberg
	Cisco Systems		Cisco Systems
	May 16, 2018		July 24, 2018
	Signaling MSD (Maximum SID Depth) using IS-IS		Signaling MSD (Maximum SID Depth) using IS-IS
	draft-ietf-isis-segment-routing-msd-12		draft-ietf-isis-segment-routing-msd-13
	Abstract		Abstract
	This document defines a way for an IS-IS Router to advertise multiple		This document defines a way for an IS-IS Router to advertise multiple
	types of supported Maximum SID Depths (MSDs) at node and/or link		types of supported Maximum SID Depths (MSDs) at node and/or link
	granularity. Such advertisements allow entities (e.g., centralized		granularity. Such advertisements allow entities (e.g., centralized
	controllers) to determine whether a particular SID stack can be		controllers) to determine whether a particular SID stack can be
	supported in a given network. This document only defines one type of		supported in a given network. This document only defines one type of
	MSD maximum label imposition, but defines an encoding that can		MSD maximum label imposition, but defines an encoding that can
	support other MSD types.		support other MSD types.
	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 November 17, 2018.		This Internet-Draft will expire on January 25, 2019.
	Copyright Notice		Copyright Notice
	Copyright (c) 2018 IETF Trust and the persons identified as the		Copyright (c) 2018 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 4, line 37 ¶		skipping to change at page 4, line 37 ¶
	Figure 1: Node MSD Sub-TLV		Figure 1: Node MSD Sub-TLV
	Type: 23 (allocated by IANA via the early assignment process)		Type: 23 (allocated by IANA via the early assignment process)
	Length: variable (minimum of 2, multiple of 2 octets) and represents		Length: variable (minimum of 2, multiple of 2 octets) and represents
	the total length of value field.		the total length of value field.
	Value: field consists of one or more pairs of a 1 octet MSD-Type and		Value: field consists of one or more pairs of a 1 octet MSD-Type and
	1 octet MSD-Value.		1 octet MSD-Value.
	MSD-Type is one of the values defined in the MSD Types registry		MSD-Type is one of the values defined in the IGP MSD Types registry
	created by the IANA Section of this document.		created by the IANA Section of this document.
	MSD-Value is a number in the range of 0-255. For all MSD-Types, 0		MSD-Value is a number in the range of 0-255. For all MSD-Types, 0
	represents lack of the ability to support SID stack of any depth; any		represents lack of the ability to support SID stack of any depth; any
	other value represents that of the node. This value MUST represent		other value represents that of the node. This value MUST represent
	the lowest value supported by any link configured for use by the		the lowest value supported by any link configured for use by the
	advertising IS-IS instance.		advertising IS-IS instance.
	This sub-TLV is optional. The scope of the advertisement is specific		This sub-TLV is optional. The scope of the advertisement is specific
	to the deployment.		to the deployment.
	skipping to change at page 7, line 26 ¶		skipping to change at page 7, line 26 ¶
	TLV 22 23 25 141 222 223		TLV 22 23 25 141 222 223
	--- --------------------		--- --------------------
	y y y y y y		y y y y y y
	Figure 5: TLVs where LINK MSD Sub-TLV can be present		Figure 5: TLVs where LINK MSD Sub-TLV can be present
	This document requests creation of an IANA managed registry under a		This document requests creation of an IANA managed registry under a
	new category of "Interior Gateway Protocol (IGP) Parameters" IANA		new category of "Interior Gateway Protocol (IGP) Parameters" IANA
	registries to identify MSD types as proposed in Section 2 and		registries to identify MSD types as proposed in Section 2 and
	Section 3. The registration procedure is "Expert Review" as defined		Section 3. The registration procedure is "Expert Review" as defined
	in [RFC8126]. Suggested registry name is "MSD types". Types are an		in [RFC8126]. Suggested registry name is "IGP MSD Types". Types are
	unsigned 8 bit number. The following values are defined by this		an unsigned 8 bit number. The following values are defined by this
	document		document
	Value Name Reference		Value Name Reference
	----- --------------------- -------------		----- --------------------- -------------
	0 Reserved This document		0 Reserved This document
	1 Base MPLS Imposition MSD This document		1 Base MPLS Imposition MSD This document
	2-250 Unassigned This document		2-250 Unassigned This document
	251-254 Experimental This document		251-254 Experimental This document
	255 Reserved This document		255 Reserved This document
	skipping to change at page 9, line 8 ¶		skipping to change at page 9, line 8 ¶
	[I-D.ietf-isis-mpls-elc]		[I-D.ietf-isis-mpls-elc]
	Xu, X., Kini, S., Sivabalan, S., Filsfils, C., and S.		Xu, X., Kini, S., Sivabalan, S., Filsfils, C., and S.
	Litkowski, "Signaling Entropy Label Capability and		Litkowski, "Signaling Entropy Label Capability and
	Readable Label-stack Depth Using IS-IS", draft-ietf-isis-		Readable Label-stack Depth Using IS-IS", draft-ietf-isis-
	mpls-elc-03 (work in progress), January 2018.		mpls-elc-03 (work in progress), January 2018.
	[I-D.ietf-pce-segment-routing]		[I-D.ietf-pce-segment-routing]
	Sivabalan, S., Filsfils, C., Tantsura, J., Henderickx, W.,		Sivabalan, S., Filsfils, C., Tantsura, J., Henderickx, W.,
	and J. Hardwick, "PCEP Extensions for Segment Routing",		and J. Hardwick, "PCEP Extensions for Segment Routing",
	draft-ietf-pce-segment-routing-11 (work in progress),		draft-ietf-pce-segment-routing-12 (work in progress), June
	November 2017.		2018.
	[RFC7752] Gredler, H., Ed., Medved, J., Previdi, S., Farrel, A., and		[RFC7752] Gredler, H., Ed., Medved, J., Previdi, S., Farrel, A., and
	S. Ray, "North-Bound Distribution of Link-State and		S. Ray, "North-Bound Distribution of Link-State and
	Traffic Engineering (TE) Information Using BGP", RFC 7752,		Traffic Engineering (TE) Information Using BGP", RFC 7752,
	DOI 10.17487/RFC7752, March 2016,		DOI 10.17487/RFC7752, March 2016,
	<https://www.rfc-editor.org/info/rfc7752>.		<https://www.rfc-editor.org/info/rfc7752>.
	[RFC8126] Cotton, M., Leiba, B., and T. Narten, "Guidelines for		[RFC8126] Cotton, M., Leiba, B., and T. Narten, "Guidelines for
	Writing an IANA Considerations Section in RFCs", BCP 26,		Writing an IANA Considerations Section in RFCs", BCP 26,
	RFC 8126, DOI 10.17487/RFC8126, June 2017,		RFC 8126, DOI 10.17487/RFC8126, June 2017,
End of changes. 7 change blocks.
	9 lines changed or deleted		9 lines changed or added
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