draft-ietf-opsawg-oam-overview-13.txt		draft-ietf-opsawg-oam-overview-14.txt
	Operations and Management Area Working Group T. Mizrahi		Operations and Management Area Working Group T. Mizrahi
	Internet Draft Marvell		Internet Draft Marvell
	Intended status: Informational N. Sprecher		Intended status: Informational N. Sprecher
	Expires: July 2014 Nokia Solutions and Networks		Expires: August 2014 Nokia Solutions and Networks
	E. Bellagamba		E. Bellagamba
	Ericsson		Ericsson
	Y. Weingarten		Y. Weingarten
	January 28, 2014		February 18, 2014
	An Overview of		An Overview of
	Operations, Administration, and Maintenance (OAM) Tools		Operations, Administration, and Maintenance (OAM) Tools
	draft-ietf-opsawg-oam-overview-13.txt		draft-ietf-opsawg-oam-overview-14.txt
	Abstract		Abstract
	Operations, Administration, and Maintenance (OAM) is a general term		Operations, Administration, and Maintenance (OAM) is a general term
	that refers to a toolset for fault detection and isolation, and for		that refers to a toolset for fault detection and isolation, and for
	performance measurement. Over the years various OAM tools have been		performance measurement. Over the years various OAM tools have been
	defined for various layers in the protocol stack.		defined for various layers in the protocol stack.
	This document summarizes some of the OAM tools defined in the IETF in		This document summarizes some of the OAM tools defined in the IETF in
	the context of IP unicast, MPLS, MPLS for the transport profile		the context of IP unicast, MPLS, MPLS for the transport profile
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	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."
	The list of current Internet-Drafts can be accessed at		The list of current Internet-Drafts can be accessed at
	http://www.ietf.org/ietf/1id-abstracts.txt.		http://www.ietf.org/ietf/1id-abstracts.txt.
	The list of Internet-Draft Shadow Directories can be accessed at		The list of Internet-Draft Shadow Directories can be accessed at
	http://www.ietf.org/shadow.html.		http://www.ietf.org/shadow.html.
	This Internet-Draft will expire on July 28, 2014.		This Internet-Draft will expire on August 18, 2014.
	Copyright Notice		Copyright Notice
	Copyright (c) 2014 IETF Trust and the persons identified as the		Copyright (c) 2014 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
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	BFD [BFD-LSP] can be used to detect MPLS LSP data plane failures.		BFD [BFD-LSP] can be used to detect MPLS LSP data plane failures.
	A BFD session is established for each MPLS LSP that is being		A BFD session is established for each MPLS LSP that is being
	monitored. BFD Control packets must be sent along the same path as		monitored. BFD Control packets must be sent along the same path as
	the monitored LSP. If the LSP is associated with multiple FECs, a BFD		the monitored LSP. If the LSP is associated with multiple FECs, a BFD
	session is established for each FEC.		session is established for each FEC.
	While LSP Ping can be used for detecting MPLS data plane failures and		While LSP Ping can be used for detecting MPLS data plane failures and
	for verifying the MPLS LSP data plane against the control plane, BFD		for verifying the MPLS LSP data plane against the control plane, BFD
	can only be used for the former. The advantage of BFD is that it can		can only be used for the former. BFD can be used in conjunction with
	provide faster failure detection, and scales better to a large number		LSP Ping, as is the case in MPLS-TP (see Section 4.5.4.).
	of LSPs. Thus, a combination of LSP Ping and BFD can provide the
	advantages of BFD, as well as allow to verify the data plane against
	the control plane.
	4.4.3. OAM for Virtual Private Networks (VPN) over MPLS		4.4.3. OAM for Virtual Private Networks (VPN) over MPLS
	The IETF has defined two classes of VPNs, Layer 2 VPNs (L2VPN) and		The IETF has defined two classes of VPNs, Layer 2 VPNs (L2VPN) and
	Layer 3 VPNs (L3VPN). [L2VPN-OAM] provides the requirements and		Layer 3 VPNs (L3VPN). [L2VPN-OAM] provides the requirements and
	framework for OAM in the context of Layer 2 Virtual Private Networks		framework for OAM in the context of Layer 2 Virtual Private Networks
	(L2VPN), and specifically it also defines the OAM layering of L2VPNs		(L2VPN), and specifically it also defines the OAM layering of L2VPNs
	over MPLS. [L3VPN-OAM] provides a framework for the operation and		over MPLS. [L3VPN-OAM] provides a framework for the operation and
	management of Layer 3 Virtual Private Networks (L3VPNs).		management of Layer 3 Virtual Private Networks (L3VPNs).
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