Options for MPLS Extension Header Indicator
draft-song-mpls-eh-indicator-00

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Last updated 2019-02-15
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MPLS                                                        H. Song, Ed.
Internet-Draft                                                     Z. Li
Intended status: Informational                                   T. Zhou
Expires: August 19, 2019                                          Huawei
                                                            L. Andersson
                                                Bronze Dragon Consulting
                                                       February 15, 2019

              Options for MPLS Extension Header Indicator
                    draft-song-mpls-eh-indicator-00

Abstract

   This document describes the schemes that indicates the presence of
   the MPLS extension header(s) following the MPLS label stack.  After a
   thorough evaluation of these options by comparing their pros and
   cons, one should be chosen as the final scheme for MPLS extension
   header indicator.

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.

Status of This Memo

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

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at https://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on August 19, 2019.

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Copyright Notice

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

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (https://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Dedicated Extension Header Label  . . . . . . . . . . . . . .   3
     2.1.  Special Purpose Label . . . . . . . . . . . . . . . . . .   3
     2.2.  Extension Label plus an Extended Special Purpose Label  .   3
   3.  Generic Associated Channel Extension  . . . . . . . . . . . .   4
     3.1.  GAL and Associated Channel Header . . . . . . . . . . . .   4
     3.2.  GAL and a Different Nibble Value  . . . . . . . . . . . .   4
   4.  Configured FEC Labels . . . . . . . . . . . . . . . . . . . .   5
   5.  Summary . . . . . . . . . . . . . . . . . . . . . . . . . . .   6
   6.  Considerations of EHI . . . . . . . . . . . . . . . . . . . .   7
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .   8
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   8
   9.  Contributors  . . . . . . . . . . . . . . . . . . . . . . . .   8
   10. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .   8
   11. References  . . . . . . . . . . . . . . . . . . . . . . . . .   8
     11.1.  Normative References . . . . . . . . . . . . . . . . . .   8
     11.2.  Informative References . . . . . . . . . . . . . . . . .   9
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   9

1.  Introduction

   The document [I-D.song-mpls-extension-header] presents the
   motivation, specification, and use cases of MPLS Extension Header
   (EH).  However, multiple options are possible to indicate the
   presence of the extension header(s).

   We propound three categories of methods which can be further
   partitioned into five unique schemes.  Four of them use explicit data
   plane encoding to indicate the EH and the last one implies the EH
   through control plane configuration.  This document details and

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   compares these schemes, in order to foster further discussions until
   a final decision is made.

2.  Dedicated Extension Header Label
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