In-situ OAM IPv6 Options
draft-ioametal-ippm-6man-ioam-ipv6-options-00

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 IPv6.

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 December 31, 2018.

Copyright Notice

Copyright (c) 2018 IETF Trust and the persons identified as the document authors. All rights reserved.

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Table of Contents

• 1. Introduction
• 2. Conventions
• 2.1. Requirements Language
• 2.2. Abbreviations
• 3. In-situ OAM Metadata Transport in IPv6
• 4. Security Considerations
• 5. IANA Considerations
• 6. Acknowledgements
• 7. References
• 7.1. Normative References
• 7.2. Informative References
• Authors' Addresses

1. Introduction

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 IPv6 [RFC8200].

2. Conventions

2.1. Requirements Language

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.

2.2. Abbreviations

Abbreviations used in this document:

E2E:

Edge-to-Edge

IOAM:

In-situ Operations, Administration, and Maintenance

OAM:

Operations, Administration, and Maintenance

POT:

Proof of Transit

3. In-situ OAM Metadata Transport in IPv6

An IPv6 option is defined corresponding to each of the IOAM data fields defined in [I-D.ietf-ippm-ioam-data]. This mechanisms of in-situ OAM in IPv6 is used to enhance diagnostics of IPv6 networks. It complements other mechanisms proposed to enhance diagnostics of IPv6 networks, such as the IPv6 Performance and Diagnostic Metrics Destination Option described in [RFC8250]. IOAM data is carried in IPv6 packets as Hop-by-Hop or Destination options as specified in the individual option definition below.

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|  Option Type  |  Opt Data Len |         Reserved (MBZ)        |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+<-+
|                                                               |  |
.                                                               .  I
.                     Option Data                               .  O
.                                                               .  A
.                                                               .  M
.                                                               .  .
.                                                               .  O
.                                                               .  P
.                                                               .  T
.                                                               .  I
.                                                               .  O
.                                                               .  N
.                                                               .  |
|                                                               |  |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+<-+

Option Type          8-bit identifier of the type of option.

Opt Data Len         8-bit unsigned integer.  Length of the
                     Reserved and Option Data field of this option,
                     in octets.

Reserved (MBZ)       16-bit field MUST be filled with zeroes.

Option Data          Variable-length field.  Option-Type-specific
                     data.

IPv6 hop-by-hop and destination option format for carrying in-situ OAM data fields:

In-situ OAM Options are inserted as Option data as follows:[I-D.ietf-ippm-ioam-data]. In addition, to maintain IPv6 extenstion header 8-octet alignment requirement, Trace-Type for Incremental Tracing Option in IPv6 MUST be selected such that the IOAM node data length is a multiple of 8-octets.

1. Pre-allocated Tracing Option: The in-situ OAM Preallocated Tracing option defined in [I-D.ietf-ippm-ioam-data] is represented as a IPv6 option in hop by hop extension header by allocating following type:

   Option Type:

   001xxxxxx 8-bit identifier of the type of option. xxxxxx=TBD1.

2. Incremental Tracing Option: The in-situ OAM Incremental Tracing option defined in [I-D.ietf-ippm-ioam-data] is represented as a IPv6 option in hop by hop extension header by allocating following type:

   Option Type:

   001xxxxxx 8-bit identifier of the type of option. xxxxxx=TBD2.

3. Proof of Transit Option: The in-situ OAM POT option defined in [I-D.ietf-ippm-ioam-data] is represented as a IPv6 option in hop by hop extension header by allocating following type:

   Option Type:

   001xxxxxx 8-bit identifier of the type of option. xxxxxx=TBD3.

4. Edge to Edge Option: The in-situ OAM E2E option defined in [I-D.ietf-ippm-ioam-data] is represented as a IPv6 option in IPv6 option in destination options extension header by allocating following type:

   Option Type:

   000xxxxxx 8-bit identifier of the type of option. xxxxxx=TBD4.

All the in-situ OAM IPv6 options defined here have alignment requirement. Following the convention in IPv6, these options are aligned in a packet so that multi-octet values within the Option Data field of each option are 4-octet aligned as specified in

4. Security Considerations

This document describes the encapsulation of IOAM data fields in IPv6. Security considerations of the specific IOAM data fields for each case (i.e., Trace, Proof of Transit, and E2E) are described in defined in [I-D.ietf-ippm-ioam-data].

As this document describes new options for IPv6 , these are similar to the security considerations of [RFC8200] and the new weakness documented in [RFC8250].

5. IANA Considerations

This draft requests the following IPv6 Option Type assignments from the Destination Options and Hop-by-Hop Options sub-registry of Internet Protocol Version 6 (IPv6) Parameters.

http://www.iana.org/assignments/ipv6-parameters/ipv6- parameters.xhtml#ipv6-parameters-2

   Hex Value    Binary Value      Description           Reference
                act chg rest
   ----------------------------------------------------------------
   TBD_1        00   1   TBD1   IOAM Pre-allocated      [This draft]
                                Tracing Option
   TBD_2        00   1   TBD2   IOAM Incremental        [This draft]
                                Tracing Option
   TBD_3        00   1   TBD3   IOAM Proof of Transit   [This draft]
                                Option
   TBD_4        00   0   TBD4   IOAM Edge to Edge       [This draft]
                                Option

6. Acknowledgements

The authors would like to thank Tom Herbert, Eric Vyncke, Nalini Elkins, Srihari Raghavan, Ranganathan T S, Karthik Babu Harichandra Babu, Akshaya Nadahalli, Stefano Previdi, Hemant Singh, Erik Nordmark, LJ Wobker, and Andrew Yourtchenko for the comments and advice. For the IPv6 encapsulation, this document leverages concepts described in [I-D.kitamura-ipv6-record-route]. The authors would like to acknowledge the work done by the author Hiroshi Kitamura and people involved in writing it.

7. References

7.1. Normative References

7.2. Informative References

Authors' Addresses