< draft-ietf-isis-segment-routing-msd-06.txt		draft-ietf-isis-segment-routing-msd-07.txt >
	IS-IS Working Group J. Tantsura		IS-IS Working Group J. Tantsura
	Internet-Draft Individual		Internet-Draft Individual
	Intended status: Standards Track U. Chunduri		Intended status: Standards Track U. Chunduri
	Expires: June 4, 2018 Huawei Technologies		Expires: June 7, 2018 Huawei Technologies
	S. Aldrin		S. Aldrin
	Google, Inc		Google, Inc
	L. Ginsberg		L. Ginsberg
	Cisco Systems		Cisco Systems
	December 01, 2017		December 04, 2017
	Signaling MSD (Maximum SID Depth) using IS-IS		Signaling MSD (Maximum SID Depth) using IS-IS
	draft-ietf-isis-segment-routing-msd-06		draft-ietf-isis-segment-routing-msd-07
	Abstract		Abstract
	This document proposes a way to signal Maximum SID Depth (MSD)		This document proposes a way to signal Maximum SID Depth (MSD)
	supported by a node at node and/or link granularity by an IS-IS		supported by a node at node and/or link granularity by an IS-IS
	Router. In a Segment Routing (SR) enabled network a centralized		Router. In a Segment Routing (SR) enabled network a centralized
	controller that programs SR tunnels needs to know the MSD supported		controller that programs SR tunnels needs to know the MSD supported
	by the head-end at node and/or link granularity to impose the SID		by the head-end at node and/or link granularity to impose the SID
	stack of an appropriate depth. MSD is relevant to the head-end of a		stack of an appropriate depth. MSD is relevant to the head-end of a
	SR tunnel or Binding-SID anchor node where Binding-SID expansions		SR tunnel or Binding-SID anchor node where Binding-SID expansions
	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 June 4, 2018.		This Internet-Draft will expire on June 7, 2018.
	Copyright Notice		Copyright Notice
	Copyright (c) 2017 IETF Trust and the persons identified as the		Copyright (c) 2017 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 6, line 11 ¶		skipping to change at page 6, line 11 ¶
	For the Link MSD, we request IANA to allocate new sub-TLV codes as		For the Link MSD, we request IANA to allocate new sub-TLV codes as
	defined in Section 4 from Sub-TLVs for TLVs 22, 23, 141, 222 and 223		defined in Section 4 from Sub-TLVs for TLVs 22, 23, 141, 222 and 223
	registry.		registry.
	Value Description Reference		Value Description Reference
	----- --------------- -------------		----- --------------- -------------
	15 Link MSD This document		15 Link MSD This document
	Figure 4: Link MSD		Figure 4: Link MSD
	Per TLV information where LINK MSD sub-TLV can be part of:		Per TLV information where Link MSD sub-TLV can be part of:
	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 the creation of a new IANA managed registry to		This document requests creation of a new IANA managed registry under
	identify MSD types as proposed in Section 3, Section 4. The		a new category of "Interior Gateway Protocol (IGP) Parameters" IANA
	registration procedure is "Expert Review" as defined in [RFC8126].		registries to identify MSD types as proposed in Section 3, Section 4.
	Suggested registry name is "MSD Sub-types". Types are an unsigned 8		The registration procedure is "Expert Review" as defined in
	bit number. The following values are defined by this document		[RFC8126]. Suggested registry name is "MSD Sub-types". Types are an
			unsigned 8 bit number. The following values are defined by this
			document
	Value Name Reference		Value Name Reference
	----- --------------------- -------------		----- --------------------- -------------
	0 Reserved This document		0 Reserved This document
	1 Base MSD This document		1 Base 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
	Figure 6: MSD Sub-type Codepoints Registry		Figure 6: MSD Sub-type Codepoints Registry
End of changes. 6 change blocks.
	10 lines changed or deleted		12 lines changed or added
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