< draft-ietf-ospf-segment-routing-extensions-22.txt		draft-ietf-ospf-segment-routing-extensions-23.txt >
	Open Shortest Path First IGP P. Psenak, Ed.		Open Shortest Path First IGP P. Psenak, Ed.
	Internet-Draft S. Previdi, Ed.		Internet-Draft S. Previdi, Ed.
	Intended status: Standards Track C. Filsfils		Intended status: Standards Track C. Filsfils
	Expires: May 31, 2018 Cisco Systems, Inc.		Expires: June 16, 2018 Cisco Systems, Inc.
	H. Gredler		H. Gredler
	RtBrick Inc.		RtBrick Inc.
	R. Shakir		R. Shakir
	Google, Inc.		Google, Inc.
	W. Henderickx		W. Henderickx
	Nokia		Nokia
	J. Tantsura		J. Tantsura
	Individual		Individual
	November 27, 2017		December 13, 2017
	OSPF Extensions for Segment Routing		OSPF Extensions for Segment Routing
	draft-ietf-ospf-segment-routing-extensions-22		draft-ietf-ospf-segment-routing-extensions-23
	Abstract		Abstract
	Segment Routing (SR) allows a flexible definition of end-to-end paths		Segment Routing (SR) allows a flexible definition of end-to-end paths
	within IGP topologies by encoding paths as sequences of topological		within IGP topologies by encoding paths as sequences of topological
	sub-paths, called "segments". These segments are advertised by the		sub-paths, called "segments". These segments are advertised by the
	link-state routing protocols (IS-IS and OSPF).		link-state routing protocols (IS-IS and OSPF).
	This draft describes the OSPF extensions required for Segment		This draft describes the OSPF extensions required for Segment
	Routing.		Routing.
	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 May 31, 2018.		This Internet-Draft will expire on June 16, 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 2, line 44 ¶		skipping to change at page 2, line 44 ¶
	6.1. Adj-SID Sub-TLV . . . . . . . . . . . . . . . . . . . . . 16		6.1. Adj-SID Sub-TLV . . . . . . . . . . . . . . . . . . . . . 16
	6.2. LAN Adj-SID Sub-TLV . . . . . . . . . . . . . . . . . . . 18		6.2. LAN Adj-SID Sub-TLV . . . . . . . . . . . . . . . . . . . 18
	7. Elements of Procedure . . . . . . . . . . . . . . . . . . . . 19		7. Elements of Procedure . . . . . . . . . . . . . . . . . . . . 19
	7.1. Intra-area Segment routing in OSPFv2 . . . . . . . . . . 19		7.1. Intra-area Segment routing in OSPFv2 . . . . . . . . . . 19
	7.2. Inter-area Segment routing in OSPFv2 . . . . . . . . . . 20		7.2. Inter-area Segment routing in OSPFv2 . . . . . . . . . . 20
	7.3. Segment Routing for External Prefixes . . . . . . . . . . 21		7.3. Segment Routing for External Prefixes . . . . . . . . . . 21
	7.4. Advertisement of Adj-SID . . . . . . . . . . . . . . . . 21		7.4. Advertisement of Adj-SID . . . . . . . . . . . . . . . . 21
	7.4.1. Advertisement of Adj-SID on Point-to-Point Links . . 21		7.4.1. Advertisement of Adj-SID on Point-to-Point Links . . 21
	7.4.2. Adjacency SID on Broadcast or NBMA Interfaces . . . . 21		7.4.2. Adjacency SID on Broadcast or NBMA Interfaces . . . . 21
	8. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 22		8. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 22
	8.1. OSPF OSPF Router Information (RI) TLVs Registry . . . . . 22		8.1. OSPF Router Information (RI) TLVs Registry . . . . . . . 22
	8.2. OSPF Extended Prefix LSA TLV Registry . . . . . . . . . . 22		8.2. OSPFv2 Extended Prefix Opaque LSA TLVs Registry . . . . . 22
	8.3. OSPF Extended Prefix LSA Sub-TLV Registry . . . . . . . . 22		8.3. OSPFv2 Extended Prefix TLV Sub-TLVs Registry . . . . . . 22
	8.4. OSPF Extended Link LSA Sub-TLV Registry . . . . . . . . . 22		8.4. OSPFv2 Extended Link TLV Sub-TLVs Registry . . . . . . . 22
	8.5. IGP Algorithm Type Registry . . . . . . . . . . . . . . . 23		8.5. IGP Algorithm Type Registry . . . . . . . . . . . . . . . 23
	9. Implementation Status . . . . . . . . . . . . . . . . . . . . 23		9. Implementation Status . . . . . . . . . . . . . . . . . . . . 23
	10. Security Considerations . . . . . . . . . . . . . . . . . . . 25		10. Security Considerations . . . . . . . . . . . . . . . . . . . 25
	11. Contributors . . . . . . . . . . . . . . . . . . . . . . . . 25		11. Contributors . . . . . . . . . . . . . . . . . . . . . . . . 25
	12. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 25		12. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 25
	13. References . . . . . . . . . . . . . . . . . . . . . . . . . 25		13. References . . . . . . . . . . . . . . . . . . . . . . . . . 25
	13.1. Normative References . . . . . . . . . . . . . . . . . . 26		13.1. Normative References . . . . . . . . . . . . . . . . . . 26
	13.2. Informative References . . . . . . . . . . . . . . . . . 26		13.2. Informative References . . . . . . . . . . . . . . . . . 26
	Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 27		Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 27
	skipping to change at page 8, line 41 ¶		skipping to change at page 8, line 41 ¶
	Label Range TLV advertisement, area-scoped flooding is REQUIRED.		Label Range TLV advertisement, area-scoped flooding is REQUIRED.
	3.3. SR Local Block TLV		3.3. SR Local Block TLV
	The SR Local Block TLV (SRLB TLV) contains the range of labels the		The SR Local Block TLV (SRLB TLV) contains the range of labels the
	node has reserved for local SIDs. SIDs from the SRLB MAY be used for		node has reserved for local SIDs. SIDs from the SRLB MAY be used for
	Adjacency-SIDs, but also by components other than the OSPF protocol.		Adjacency-SIDs, but also by components other than the OSPF protocol.
	As an example, an application or a controller may instruct the router		As an example, an application or a controller may instruct the router
	to allocate a specific local SID. Some controllers or applications		to allocate a specific local SID. Some controllers or applications
	may use the control plane to discover the available set of local SIDs		may use the control plane to discover the available set of local SIDs
	on a particular router. In such cases, the SRLG is advertised in the		on a particular router. In such cases, the SRLB is advertised in the
	control plane. The requirement to advertise the SRLB is further		control plane. The requirement to advertise the SRLB is further
	described in [I-D.ietf-spring-segment-routing-mpls]. The SRLB TLV is		described in [I-D.ietf-spring-segment-routing-mpls]. The SRLB TLV is
	used to advertise the SRLB.		used to advertise the SRLB.
	The SRLB TLV is a top-level TLV of the Router Information Opaque LSA		The SRLB TLV is a top-level TLV of the Router Information Opaque LSA
	(defined in [RFC7770]).		(defined in [RFC7770]).
	The SRLB TLV MAY appear multiple times in the Router Information		The SRLB TLV MAY appear multiple times in the Router Information
	Opaque LSA and has the following format:		Opaque LSA and has the following format:
	skipping to change at page 22, line 19 ¶		skipping to change at page 22, line 19 ¶
	using the Adj-SID Sub-TLV as described in Section 6.1.		using the Adj-SID Sub-TLV as described in Section 6.1.
	SR capable routers MAY also advertise a LAN-Adj-SID for other		SR capable routers MAY also advertise a LAN-Adj-SID for other
	neighbors (e.g., BDR, DR-OTHER) on the broadcast, NBMA, or hybrid		neighbors (e.g., BDR, DR-OTHER) on the broadcast, NBMA, or hybrid
	network using the LAN-ADJ-SID Sub-TLV as described in Section 6.2.		network using the LAN-ADJ-SID Sub-TLV as described in Section 6.2.
	8. IANA Considerations		8. IANA Considerations
	This specification updates several existing OSPF registries.		This specification updates several existing OSPF registries.
	8.1. OSPF OSPF Router Information (RI) TLVs Registry		8.1. OSPF Router Information (RI) TLVs Registry
	o 8 (IANA Preallocated) - SR-Algorithm TLV		o 8 (IANA Preallocated) - SR-Algorithm TLV
	o 9 (IANA Preallocated) - SID/Label Range TLV		o 9 (IANA Preallocated) - SID/Label Range TLV
	o 14 - SR Local Block TLV		o 14 - SR Local Block TLV
	o 15 - SRMS Preference TLV		o 15 - SRMS Preference TLV
	8.2. OSPF Extended Prefix LSA TLV Registry		8.2. OSPFv2 Extended Prefix Opaque LSA TLVs Registry
	Following values are allocated:		Following values are allocated:
	o 2 - OSPF Extended Prefix Range TLV		o 2 - OSPF Extended Prefix Range TLV
	8.3. OSPF Extended Prefix LSA Sub-TLV Registry		8.3. OSPFv2 Extended Prefix TLV Sub-TLVs Registry
	Following values are allocated:		Following values are allocated:
	o 1 - SID/Label Sub-TLV		o 1 - SID/Label Sub-TLV
	o 2 - Prefix SID Sub-TLV		o 2 - Prefix SID Sub-TLV
	8.4. OSPF Extended Link LSA Sub-TLV Registry		8.4. OSPFv2 Extended Link TLV Sub-TLVs Registry
	Following initial values are allocated:		Following initial values are allocated:
	o 1 - SID/Label Sub-TLV		o 1 - SID/Label Sub-TLV
	o 2 - Adj-SID Sub-TLV		o 2 - Adj-SID Sub-TLV
	o 3 - LAN Adj-SID/Label Sub-TLV		o 3 - LAN Adj-SID/Label Sub-TLV
	8.5. IGP Algorithm Type Registry		8.5. IGP Algorithm Type Registry
End of changes. 10 change blocks.
	13 lines changed or deleted		13 lines changed or added
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