Service Function Chaining (SFC) Operations, Administration, and Maintenance (OAM) Framework
RFC 8924

Document Type RFC - Informational (October 2020; No errata)
Authors Sam Aldrin  , Carlos Pignataro  , Nagendra Nainar  , Ramki Krishnan  , Anoop Ghanwani 
Last updated 2020-10-09
Replaces draft-aldrin-sfc-oam-framework
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Document shepherd Tal Mizrahi
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IESG IESG state RFC 8924 (Informational)
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Internet Engineering Task Force (IETF)                         S. Aldrin
Request for Comments: 8924                                        Google
Category: Informational                                C. Pignataro, Ed.
ISSN: 2070-1721                                            N. Kumar, Ed.
                                                             R. Krishnan
                                                             A. Ghanwani
                                                            October 2020

    Service Function Chaining (SFC) Operations, Administration, and
                      Maintenance (OAM) Framework


   This document provides a reference framework for Operations,
   Administration, and Maintenance (OAM) for Service Function Chaining

Status of This Memo

   This document is not an Internet Standards Track specification; it is
   published for informational purposes.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Not all documents
   approved by the IESG are candidates for any level of Internet
   Standard; see Section 2 of RFC 7841.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at

Copyright Notice

   Copyright (c) 2020 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   ( in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction
     1.1.  Document Scope
     1.2.  Acronyms and Terminology
       1.2.1.  Acronyms
       1.2.2.  Terminology
   2.  SFC Layering Model
   3.  SFC OAM Components
     3.1.  The SF Component
       3.1.1.  SF Availability
       3.1.2.  SF Performance Measurement
     3.2.  The SFC Component
       3.2.1.  SFC Availability
       3.2.2.  SFC Performance Measurement
     3.3.  Classifier Component
     3.4.  Underlay Network
     3.5.  Overlay Network
   4.  SFC OAM Functions
     4.1.  Connectivity Functions
     4.2.  Continuity Functions
     4.3.  Trace Functions
     4.4.  Performance Measurement Functions
   5.  Gap Analysis
     5.1.  Existing OAM Functions
     5.2.  Missing OAM Functions
     5.3.  Required OAM Functions
   6.  Operational Aspects of SFC OAM at the Service Layer
     6.1.  SFC OAM Packet Marker
     6.2.  OAM Packet Processing and Forwarding Semantic
     6.3.  OAM Function Types
   7.  Candidate SFC OAM Tools
     7.1.  ICMP
     7.2.  BFD / Seamless BFD
     7.3.  In Situ OAM
     7.4.  SFC Traceroute
   8.  Manageability Considerations
   9.  Security Considerations
   10. IANA Considerations
   11. Informative References
   Authors' Addresses

1.  Introduction

   Service Function Chaining (SFC) enables the creation of composite
   services that consist of an ordered set of Service Functions (SFs)
   that are to be applied to any traffic selected as a result of
   classification [RFC7665].  SFC is a concept that provides for more
   than just the application of an ordered set of SFs to selected
   traffic; rather, it describes a method for deploying SFs in a way
   that enables dynamic ordering and topological independence of those
   SFs as well as the exchange of metadata between participating
   entities.  The foundations of SFC are described in the following

   *  SFC Problem Statement [RFC7498]

   *  SFC Architecture [RFC7665]

   The reader is assumed to be familiar with the material in [RFC7665].

   This document provides a reference framework for Operations,
   Administration, and Maintenance (OAM) [RFC6291] of SFC.
   Specifically, this document provides:

   *  an SFC layering model (Section 2),

   *  aspects monitored by SFC OAM (Section 3),

   *  functional requirements for SFC OAM (Section 4),

   *  a gap analysis for SFC OAM (Section 5),

   *  operational aspects of SFC OAM at the service layer (Section 6),

   *  applicability of various OAM tools (Section 7), and

   *  manageability considerations for SF and SFC (Section 8).
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