OAM Header for use in Overlay Networks
draft-ooamdt-rtgwg-ooam-header-02

Abstract

This document introduces Overlay Operations, Administration, and Maintenance (OOAM) Header to be used in overlay networks to create Overlay Associated Channel (OAC) to ensure that OOAM control packets are in-band with user traffic and de-multiplex OOAM protocols.

Status of This Memo

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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
• 1.1. Conventions used in this document
• 1.1.1. Terminology
• 1.1.2. Requirements Language
• 2. Associated Channel in Overlay Networks
• 3. Overlay OAM Header
• 4. IANA Considerations
• 4.1. OOAM Message Types
• 4.2. OOAM Header Flags
• 5. Security Considerations
• 6. Contributors
• 7. Acknowledgement
• 8. References
• 8.1. Normative References
• 8.2. Informative References
• Authors' Addresses

1. Introduction

New protocols that support overlay networks like VxLAN-GPE [I-D.ietf-nvo3-vxlan-gpe], GUE [I-D.ietf-nvo3-gue], Geneve [I-D.ietf-nvo3-geneve], BIER [I-D.ietf-bier-mpls-encapsulation], and NSH [I-D.ietf-sfc-nsh] support multi-protocol payload, e.g. Ethernet, IPv4/IPv6, and recognize Operations, Administration, and Maintenance (OAM) as one of distinct types. That ensures that Overlay OAM (OOAM)packets are sharing fate with Overlay data packet traversing the underlay.

This document introduces OOAM Header to be used in overlay networks to de-multiplex OOAM protocols.

1.1. Conventions used in this document

1.1.1. Terminology

Term "Overlay OAM" used in this document interchangeably with longer version "set of OAM protocols, methods and tools for Overlay networks".

NTP Network Time Protocol

OAC Overlay Associated Channel

OAM Operations, Administration, and Maintenance

OOAM Overlay OAM

PTP Precision Time Protocol

1.1.2. 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 [RFC2119].

2. Associated Channel in Overlay Networks

Associated channel in the overlay network is the channel that, by using the same encapsulation as user traffic, follows the same path through the underlay network as user traffic. In other words, the associated channel is in-band with user traffic. Creating notion of the overlay associated channel (OAC) in the overlay network ensures that control packets of active OAM protocols carried in the OAC are in-band with user traffic. Additionally, OAC allows depelopment of OAM tools that, from operational point of view, function in essentially the same manner in any type of overlay.

3. Overlay OAM Header

    
 0                   1                   2                   3
 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| V |           Msg Type        |           Length              |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|             Flags             |    Reserved   |   Next Prot   |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
~                  OOAM Control Packet                          ~
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

    
  0                   1
 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|T|          Reserved           |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

    
 0                   1                   2                   3
 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|  QTF  |  RTF  |                   Reserved                    |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|                           Timestamp 1                         |
|                                                               |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
~                                                               ~
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|                           Timestamp 4                         |
|                                                               |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+