Operating the Network Service Header (NSH) with Next Protocol "None"
draft-farrel-sfc-convent-03

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SFC Working Group                                              A. Farrel
Internet-Draft                                                  J. Drake
Intended status: Standards Track                        Juniper Networks
Expires: April 30, 2018                                 October 27, 2017

  Operating the Network Service Header (NSH) with Next Protocol "None"
                      draft-farrel-sfc-convent-03

Abstract

   This document describes the use of the Network Service Header (NSH)
   in a Service Function Chaining (SFC) enabled network with no payload
   data and carrying only metadata.  This is achieved by defining a new
   NSH "Next Protocol" type value of "None".

   This document illustrates some of the functions that may be achieved
   or enhanced by this mechanism, but it does not provide an exhaustive
   list of use cases, nor is it intended to be definitive about the
   functions it describes.  It is expected that other documents will
   describe specific use cases in more detail and will define the
   protocol mechanics for each use case.

Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in [RFC2119].

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

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   This Internet-Draft will expire on April 30, 2018.

Farrel & Drake           Expires April 30, 2018                 [Page 1]
Internet-Draft              NSH With No Data                October 2017

Copyright Notice

   Copyright (c) 2017 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  The Network Service Header  . . . . . . . . . . . . . . . . .   3
     2.1.  Next Protocol 'None'  . . . . . . . . . . . . . . . . . .   4
   3.  Processing Rules  . . . . . . . . . . . . . . . . . . . . . .   4
   4.  Backward Compatibility  . . . . . . . . . . . . . . . . . . .   5
   5.  Overview of Use Cases . . . . . . . . . . . . . . . . . . . .   5
     5.1.  Per-SFP Metadata  . . . . . . . . . . . . . . . . . . . .   5
     5.2.  Per-Flow Metadata . . . . . . . . . . . . . . . . . . . .   6
     5.3.  Coordination Between SFC-Aware SFIs . . . . . . . . . . .   6
     5.4.  Operations, Administration, and Maintenance (OAM) . . . .   7
     5.5.  Control Plane and Management Plane Uses . . . . . . . . .   7
     5.6.  Non-Applicable Use Cases  . . . . . . . . . . . . . . . .   8
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   8
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   9
   8.  Contributors  . . . . . . . . . . . . . . . . . . . . . . . .   9
   9.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   9
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .   9
     10.1.  Normative References . . . . . . . . . . . . . . . . . .   9
     10.2.  Informative References . . . . . . . . . . . . . . . . .   9
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  10

1.  Introduction

   An architecture for Service Function Chaining (SFC) is presented in
   [RFC7665].  That architecture enables packets to be forwarded along
   Service Function Paths (SFPs) to pass through various Service
   Functions (SFs) that act on the packets.  Each packet is encapsulated
   with a Network Service Header (NSH) [I-D.ietf-sfc-nsh]  that
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