rfc8924v2.txt		rfc8924.txt
	Internet Engineering Task Force (IETF) S. Aldrin		Internet Engineering Task Force (IETF) S. Aldrin
	Request for Comments: 8924 Google		Request for Comments: 8924 Google
	Category: Informational C. Pignataro, Ed.		Category: Informational C. Pignataro, Ed.
	ISSN: 2070-1721 N. Kumar, Ed.		ISSN: 2070-1721 N. Kumar, Ed.
	Cisco		Cisco
	R. Krishnan		R. Krishnan
	VMware		VMware
	A. Ghanwani		A. Ghanwani
	Dell		Dell
	September 2020		October 2020
	Service Function Chaining (SFC) Operations, Administration, and		Service Function Chaining (SFC) Operations, Administration, and
	Maintenance (OAM) Framework		Maintenance (OAM) Framework
	Abstract		Abstract
	This document provides a reference framework for Operations,		This document provides a reference framework for Operations,
	Administration, and Maintenance (OAM) for Service Function Chaining		Administration, and Maintenance (OAM) for Service Function Chaining
	(SFC).		(SFC).
	skipping to change at line 288 ¶		skipping to change at line 288 ¶
	OAM functions applicable at this component include (but are not		OAM functions applicable at this component include (but are not
	limited to) testing the SFCs and the SFPs, validation of the		limited to) testing the SFCs and the SFPs, validation of the
	correlation between an SFC and the actual forwarding path followed		correlation between an SFC and the actual forwarding path followed
	by a packet matching that SFC, i.e., the Rendered Service Path		by a packet matching that SFC, i.e., the Rendered Service Path
	(RSP). Some of the hops of an SFC may not be visible when		(RSP). Some of the hops of an SFC may not be visible when
	Hierarchical Service Function Chaining (hSFC) [RFC8459] is in use.		Hierarchical Service Function Chaining (hSFC) [RFC8459] is in use.
	In such schemes, it is the responsibility of the Internal Boundary		In such schemes, it is the responsibility of the Internal Boundary
	Node (IBN) to glue the connectivity between different levels for		Node (IBN) to glue the connectivity between different levels for
	end-to-end OAM functionality.		end-to-end OAM functionality.
	classifier component:		Classifier component:
	OAM functions applicable at this component include testing the		OAM functions applicable at this component include testing the
	validity of the classification rules and detecting any incoherence		validity of the classification rules and detecting any incoherence
	among the rules installed when more than one classifier is used,		among the rules installed when more than one classifier is used,
	as explained in Section 2.2 of [RFC7665].		as explained in Section 2.2 of [RFC7665].
	Figure 2 illustrates an example where OAM for the three defined		Figure 2 illustrates an example where OAM for the three defined
	components are used within the SFC environment.		components are used within the SFC environment.
	+-Classifier +-Service Function Chain OAM		+-Classifier +-Service Function Chain OAM
	| OAM |		| OAM |
	skipping to change at line 540 ¶		skipping to change at line 540 ¶
	SFF, SF, and SFC Proxy) on the tested layer. This function is		SFF, SF, and SFC Proxy) on the tested layer. This function is
	typically useful for gathering information from every transit device		typically useful for gathering information from every transit device
	or for isolating the failure point to a specific SF within an SFC or		or for isolating the failure point to a specific SF within an SFC or
	for an entire SFC. Some of the OAM functions supported by trace		for an entire SFC. Some of the OAM functions supported by trace
	functions are:		functions are:
	* the ability to trigger an action from every transit device at the		* the ability to trigger an action from every transit device at the
	SFC layer, using TTL or other means,		SFC layer, using TTL or other means,
	* the ability to trigger every transit device at the SFC layer to		* the ability to trigger every transit device at the SFC layer to
	generate a response with OAM code(s), using TTL or other means,		generate a response with OAM code(s) using TTL or other means,
	* the ability to discover and traverse ECMP paths within an SFC, and		* the ability to discover and traverse ECMP paths within an SFC, and
	* the ability to skip SFs that do not support OAM while tracing SFs		* the ability to skip SFs that do not support OAM while tracing SFs
	in an SFC.		in an SFC.
	4.4. Performance Measurement Functions		4.4. Performance Measurement Functions
	Performance measurement functions involve measuring of packet loss,		Performance measurement functions involve measuring of packet loss,
	delay, delay variance, etc. These performance metrics may be		delay, delay variance, etc. These performance metrics may be
End of changes. 3 change blocks.
	3 lines changed or deleted		3 lines changed or added
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