< draft-ietf-sfc-problem-statement-01.txt		draft-ietf-sfc-problem-statement-02.txt >
	Network Working Group P. Quinn, Ed.		Network Working Group P. Quinn, Ed.
	Internet-Draft Cisco Systems, Inc.		Internet-Draft Cisco Systems, Inc.
	Intended status: Informational T. Nadeau, Ed.		Intended status: Informational T. Nadeau, Ed.
	Expires: August 18, 2014 Brocade		Expires: August 18, 2014 Brocade
	February 14, 2014		February 14, 2014
	Service Function Chaining Problem Statement		Service Function Chaining Problem Statement
	draft-ietf-sfc-problem-statement-01.txt		draft-ietf-sfc-problem-statement-02.txt
	Abstract		Abstract
	This document provides an overview of the issues associated with the		This document provides an overview of the issues associated with the
	deployment of service functions (such as firewalls, load balancers)		deployment of service functions (such as firewalls, load balancers)
	in large-scale environments. The term service function chaining is		in large-scale environments. The term service function chaining is
	used to describe the definition and instantiation of an ordered set		used to describe the definition and instantiation of an ordered set
	of such service functions, and the subsequent "steering" of traffic		of such service functions, and the subsequent "steering" of traffic
	flows through those service functions.		flows through those service functions.
	skipping to change at page 3, line 30 ¶		skipping to change at page 3, line 30 ¶
	This document outlines the problems encountered with existing service		This document outlines the problems encountered with existing service
	deployment models for Service Function Chaining (SFC) (often referred		deployment models for Service Function Chaining (SFC) (often referred
	to simply as service chaining; in this document the terms will be		to simply as service chaining; in this document the terms will be
	used interchangeably), as well as the problems of service chain		used interchangeably), as well as the problems of service chain
	creation/ deletion, policy integration with service chains, and		creation/ deletion, policy integration with service chains, and
	policy enforcement within the network infrastructure.		policy enforcement within the network infrastructure.
	1.1. Definition of Terms		1.1. Definition of Terms
	Classification: Classification: Locally instantiated policy that		Classification: Locally instantiated policy that results in matching
	results in matching of traffic flows for identification of		of traffic flows for identification of appropriate outbound
	appropriate outbound forwarding actions.		forwarding actions.
	Network Overlay: A logical network built, via virtual links or		Network Overlay: A logical network built, via virtual links or
	packet encapsulation, over an existing network (the underlay).		packet encapsulation, over an existing network (the underlay).
	Service Function Chain: Service Function Chain (SFC): A service		Service Function Chain (SFC): A service Function chain defines an
	Function chain defines an ordered set of service functions that		ordered set of service functions that must be applied to packets
	must be applied to packets and/or frames selected as a result of		and/or frames selected as a result of classification. The implied
	classification. The implied order may not be a linear progression		order may not be a linear progression as nodes may copy to more
	as nodes may copy to more than one branch. The term service chain		than one branch. The term service chain is often used as
	is often used as shorthand for service function chain.		shorthand for service function chain.
	Service Function: A function that is responsible for specific		Service Function: A function that is responsible for specific
	treatment of received packets. A Service Function can act at the		treatment of received packets. A Service Function can act at the
	network layer or other OSI layers. A Service Function can be a		network layer or other OSI layers. A Service Function can be a
	virtual instance or be embedded in a physical network element.		virtual instance or be embedded in a physical network element.
	One of multiple Service Functions can be embedded in the same		One of multiple Service Functions can be embedded in the same
	network element. Multiple instances of the Service Function can		network element. Multiple instances of the Service Function can
	be enabled in the same administrative domain.		be enabled in the same administrative domain.
	A non-exhaustive list of Service Functions includes: firewalls,		A non-exhaustive list of Service Functions includes: firewalls,
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