Network Service Header (NSH) Encapsulation for In-situ OAM (IOAM) Data
draft-ietf-sfc-ioam-nsh-02

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Last updated 2019-09-11
Replaces draft-brockners-sfc-ioam-nsh
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SFC                                                    F. Brockners, Ed.
Internet-Draft                                          S. Bhandari, Ed.
Intended status: Standards Track                                   Cisco
Expires: March 14, 2020                               September 11, 2019

 Network Service Header (NSH) Encapsulation for In-situ OAM (IOAM) Data
                       draft-ietf-sfc-ioam-nsh-02

Abstract

   In-situ Operations, Administration, and Maintenance (IOAM) records
   operational and telemetry information in the packet while the packet
   traverses a path between two points in the network.  This document
   outlines how IOAM data fields are encapsulated in the Network Service
   Header (NSH).

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 March 14, 2020.

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   Copyright (c) 2019 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Conventions . . . . . . . . . . . . . . . . . . . . . . . . .   2
   3.  IOAM data fields encapsulation in NSH . . . . . . . . . . . .   3
   4.  Considerations  . . . . . . . . . . . . . . . . . . . . . . .   4
     4.1.  Discussion of the encapsulation approach  . . . . . . . .   4
     4.2.  IOAM and the use of the NSH O-bit . . . . . . . . . . . .   5
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   6
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   6
   7.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   6
   8.  Contributors  . . . . . . . . . . . . . . . . . . . . . . . .   6
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   7
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .   8
     9.2.  Informative References  . . . . . . . . . . . . . . . . .   8
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   8

1.  Introduction

   In-situ OAM (IOAM), as defined in [I-D.ietf-ippm-ioam-data], records
   OAM information within the packet while the packet traverses a
   particular network domain.  The term "in-situ" refers to the fact
   that the OAM data is added to the data packets rather than is being
   sent within packets specifically dedicated to OAM.  This document
   defines how IOAM data fields are transported as part of the Network
   Service Header (NSH) [RFC8300] encapsulation for the Service Function
   Chaining (SFC) [RFC7665].  The IOAM data fields are defined in
   [I-D.ietf-ippm-ioam-data].  An implementation of IOAM which leverages
   NSH to carry the IOAM data is available from the FD.io open source
   software project [FD.io].

2.  Conventions

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
   "OPTIONAL" in this document are to be interpreted as described in BCP
   14 [RFC2119] [RFC8174] when, and only when, they appear in all
   capitals, as shown here.

   Abbreviations used in this document:

   IOAM:      In-situ Operations, Administration, and Maintenance

   NSH:       Network Service Header

   OAM:       Operations, Administration, and Maintenance

   SFC:       Service Function Chaining

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   TLV:       Type, Length, Value

3.  IOAM data fields encapsulation in NSH

   The NSH is defined in [RFC8300].  IOAM data fields are carried in NSH
   using a next protocol header which follows the NSH MD context
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