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