< draft-ietf-mpls-spring-entropy-label-00.txt		draft-ietf-mpls-spring-entropy-label-01.txt >
	Network Working Group S. Kini, Ed.		Network Working Group S. Kini, Ed.
	Internet-Draft Ericsson		Internet-Draft Ericsson
	Intended status: Informational K. Kompella		Intended status: Informational K. Kompella
	Expires: September 6, 2015 Juniper		Expires: March 9, 2016 Juniper
	S. Sivabalan		S. Sivabalan
	Cisco		Cisco
	S. Litkowski		S. Litkowski
	Orange		Orange
	R. Shakir		R. Shakir
	B.T.
	X. Xu		X. Xu
	Huawei		Huawei
	W. Hendrickx		W. Hendrickx
	Alcatel-Lucent		Alcatel-Lucent
	J. Tantsura		J. Tantsura
	Ericsson		Ericsson
	March 5, 2015		September 6, 2015
	Entropy labels for source routed stacked tunnels		Entropy labels for source routed stacked tunnels
	draft-ietf-mpls-spring-entropy-label-00		draft-ietf-mpls-spring-entropy-label-01
	Abstract		Abstract
	Source routed tunnel stacking is a technique that can be leveraged to		Source routed tunnel stacking is a technique that can be leveraged to
	provide a method to steer a packet through a controlled set of		provide a method to steer a packet through a controlled set of
	segments. This can be applied to the Multi Protocol Label Switching		segments. This can be applied to the Multi Protocol Label Switching
	(MPLS) data plane. Entropy label (EL) is a technique used in MPLS to		(MPLS) data plane. Entropy label (EL) is a technique used in MPLS to
	improve load balancing. This document examines and describes how ELs		improve load balancing. This document examines and describes how ELs
	are to be applied to source routed stacked tunnels.		are to be applied to source routed stacked tunnels.
	skipping to change at page 1, line 48 ¶		skipping to change at page 1, line 48 ¶
	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 http://datatracker.ietf.org/drafts/current/.		Drafts is at http://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 6, 2015.		This Internet-Draft will expire on March 9, 2016.
	Copyright Notice		Copyright Notice
	Copyright (c) 2015 IETF Trust and the persons identified as the		Copyright (c) 2015 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
	(http://trustee.ietf.org/license-info) in effect on the date of		(http://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 52 ¶		skipping to change at page 3, line 4 ¶
	1. Introduction		1. Introduction
	The source routed stacked tunnels paradigm is leveraged by techniques		The source routed stacked tunnels paradigm is leveraged by techniques
	such as Segment Routing (SR) [I-D.filsfils-spring-segment-routing] to		such as Segment Routing (SR) [I-D.filsfils-spring-segment-routing] to
	steer a packet through a set of segments. This can be directly		steer a packet through a set of segments. This can be directly
	applied to the MPLS data plane, but it has implications on label		applied to the MPLS data plane, but it has implications on label
	stack depth.		stack depth.
	Clarifying statements on label stack depth have been provided in		Clarifying statements on label stack depth have been provided in
	[RFC7325] but they do not address the case of source routed stacked		[RFC7325] but they do not address the case of source routed stacked
	MPLS tunnels as described in [I-D.gredler-spring-mpls] or		MPLS tunnels as described in [I-D.filsfils-spring-segment-routing]
			where deeper label stacks are more prevalent.
	[I-D.filsfils-spring-segment-routing] where deeper label stacks are
	more prevalent.
	Entropy label (EL) [RFC6790] is a technique used in the MPLS data		Entropy label (EL) [RFC6790] is a technique used in the MPLS data
	plane to provide entropy for load balancing. When using LSP		plane to provide entropy for load balancing. When using LSP
	hierarchies there are implications on how [RFC6790] should be		hierarchies there are implications on how [RFC6790] should be
	applied. One such issue is addressed by		applied. One such issue is addressed by
	[I-D.ravisingh-mpls-el-for-seamless-mpls] but that is when different		[I-D.ravisingh-mpls-el-for-seamless-mpls] but that is when different
	levels of the hierarchy are created at different LSRs. The current		levels of the hierarchy are created at different LSRs. The current
	document addresses the case where the hierarchy is created at a		document addresses the case where the hierarchy is created at a
	single LSR as required by source stacked tunnels.		single LSR as required by source stacked tunnels.
	skipping to change at page 9, line 40 ¶		skipping to change at page 9, line 40 ¶
	9.1. Normative References		9.1. Normative References
	[I-D.filsfils-spring-segment-routing]		[I-D.filsfils-spring-segment-routing]
	Filsfils, C., Previdi, S., Bashandy, A., Decraene, B.,		Filsfils, C., Previdi, S., Bashandy, A., Decraene, B.,
	Litkowski, S., Horneffer, M., Milojevic, I., Shakir, R.,		Litkowski, S., Horneffer, M., Milojevic, I., Shakir, R.,
	Ytti, S., Henderickx, W., Tantsura, J., and E. Crabbe,		Ytti, S., Henderickx, W., Tantsura, J., and E. Crabbe,
	"Segment Routing Architecture", draft-filsfils-spring-		"Segment Routing Architecture", draft-filsfils-spring-
	segment-routing-04 (work in progress), July 2014.		segment-routing-04 (work in progress), July 2014.
	[I-D.gredler-spring-mpls]
	Gredler, H., Rekhter, Y., Jalil, L., Kini, S., and X. Xu,
	"Supporting Source/Explicitly Routed Tunnels via Stacked
	LSPs", draft-gredler-spring-mpls-06 (work in progress),
	May 2014.
	[I-D.ravisingh-mpls-el-for-seamless-mpls]		[I-D.ravisingh-mpls-el-for-seamless-mpls]
	Singh, R., Shen, Y., and J. Drake, "Entropy label for		Singh, R., Shen, Y., and J. Drake, "Entropy label for
	seamless MPLS", draft-ravisingh-mpls-el-for-seamless-		seamless MPLS", draft-ravisingh-mpls-el-for-seamless-
	mpls-04 (work in progress), October 2014.		mpls-04 (work in progress), October 2014.
	[I-D.xu-isis-mpls-elc]		[I-D.xu-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 Using IS-		Litkowski, "Signaling Entropy Label Capability Using IS-
	IS", draft-xu-isis-mpls-elc-01 (work in progress),		IS", draft-xu-isis-mpls-elc-02 (work in progress), April
	September 2014.		2015.
	[I-D.xu-ospf-mpls-elc]		[I-D.xu-ospf-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 Using		Litkowski, "Signaling Entropy Label Capability Using
	OSPF", draft-xu-ospf-mpls-elc-01 (work in progress),		OSPF", draft-xu-ospf-mpls-elc-01 (work in progress),
	October 2014.		October 2014.
	[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, March 1997.		Requirement Levels", BCP 14, RFC 2119,
			DOI 10.17487/RFC2119, March 1997,
			<http://www.rfc-editor.org/info/rfc2119>.
	[RFC4206] Kompella, K. and Y. Rekhter, "Label Switched Paths (LSP)		[RFC4206] Kompella, K. and Y. Rekhter, "Label Switched Paths (LSP)
	Hierarchy with Generalized Multi-Protocol Label Switching		Hierarchy with Generalized Multi-Protocol Label Switching
	(GMPLS) Traffic Engineering (TE)", RFC 4206, October 2005.		(GMPLS) Traffic Engineering (TE)", RFC 4206,
			DOI 10.17487/RFC4206, October 2005,
			<http://www.rfc-editor.org/info/rfc4206>.
	[RFC6790] Kompella, K., Drake, J., Amante, S., Henderickx, W., and		[RFC6790] Kompella, K., Drake, J., Amante, S., Henderickx, W., and
	L. Yong, "The Use of Entropy Labels in MPLS Forwarding",		L. Yong, "The Use of Entropy Labels in MPLS Forwarding",
	RFC 6790, November 2012.		RFC 6790, DOI 10.17487/RFC6790, November 2012,
			<http://www.rfc-editor.org/info/rfc6790>.
	9.2. Informative References		9.2. Informative References
	[I-D.filsfils-spring-segment-routing-use-cases]		[I-D.filsfils-spring-segment-routing-use-cases]
	Filsfils, C., Francois, P., Previdi, S., Decraene, B.,		Filsfils, C., Francois, P., Previdi, S., Decraene, B.,
	Litkowski, S., Horneffer, M., Milojevic, I., Shakir, R.,		Litkowski, S., Horneffer, M., Milojevic, I., Shakir, R.,
	Ytti, S., Henderickx, W., Tantsura, J., Kini, S., and E.		Ytti, S., Henderickx, W., Tantsura, J., Kini, S., and E.
	Crabbe, "Segment Routing Use Cases", draft-filsfils-		Crabbe, "Segment Routing Use Cases", draft-filsfils-
	spring-segment-routing-use-cases-01 (work in progress),		spring-segment-routing-use-cases-01 (work in progress),
	October 2014.		October 2014.
	[I-D.ietf-isis-segment-routing-extensions]		[I-D.ietf-isis-segment-routing-extensions]
	Previdi, S., Filsfils, C., Bashandy, A., Gredler, H.,		Previdi, S., Filsfils, C., Bashandy, A., Gredler, H.,
	Litkowski, S., Decraene, B., and J. Tantsura, "IS-IS		Litkowski, S., Decraene, B., and J. Tantsura, "IS-IS
	Extensions for Segment Routing", draft-ietf-isis-segment-		Extensions for Segment Routing", draft-ietf-isis-segment-
	routing-extensions-03 (work in progress), October 2014.		routing-extensions-05 (work in progress), June 2015.
	[I-D.ietf-ospf-segment-routing-extensions]		[I-D.ietf-ospf-segment-routing-extensions]
	Psenak, P., Previdi, S., Filsfils, C., Gredler, H.,		Psenak, P., Previdi, S., Filsfils, C., Gredler, H.,
	Shakir, R., Henderickx, W., and J. Tantsura, "OSPF		Shakir, R., Henderickx, W., and J. Tantsura, "OSPF
	Extensions for Segment Routing", draft-ietf-ospf-segment-		Extensions for Segment Routing", draft-ietf-ospf-segment-
	routing-extensions-04 (work in progress), February 2015.		routing-extensions-05 (work in progress), June 2015.
	[RFC7325] Villamizar, C., Kompella, K., Amante, S., Malis, A., and		[RFC7325] Villamizar, C., Ed., Kompella, K., Amante, S., Malis, A.,
	C. Pignataro, "MPLS Forwarding Compliance and Performance		and C. Pignataro, "MPLS Forwarding Compliance and
	Requirements", RFC 7325, August 2014.		Performance Requirements", RFC 7325, DOI 10.17487/RFC7325,
			August 2014, <http://www.rfc-editor.org/info/rfc7325>.
	Authors' Addresses		Authors' Addresses
	Sriganesh Kini (editor)		Sriganesh Kini (editor)
	Ericsson		Ericsson
	Email: sriganesh.kini@ericsson.com		Email: sriganesh.kini@ericsson.com
	Kireeti Kompella		Kireeti Kompella
	Juniper		Juniper
	skipping to change at page 11, line 28 ¶		skipping to change at page 11, line 28 ¶
	Cisco		Cisco
	Email: msiva@cisco.com		Email: msiva@cisco.com
	Stephane Litkowski		Stephane Litkowski
	Orange		Orange
	Email: stephane.litkowski@orange.com		Email: stephane.litkowski@orange.com
	Rob Shakir		Rob Shakir
	B.T.
	Email: rob.shakir@bt.com		Email: rjs@rob.sh
	Xiaohu Xu		Xiaohu Xu
	Huawei		Huawei
	Email: xuxiaohu@huawei.com		Email: xuxiaohu@huawei.com
	Wim Hendrickx		Wim Hendrickx
	Alcatel-Lucent		Alcatel-Lucent
	Email: wim.henderickx@alcatel-lucent.com		Email: wim.henderickx@alcatel-lucent.com
End of changes. 16 change blocks.
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