MPLS Payload Protocol Identifier
draft-xu-mpls-payload-protocol-identifier-07

Document Type Active Internet-Draft (individual)
Authors Xiaohu Xu  , Hamid Assarpour  , Shaowen Ma  , Francois Clad 
Last updated 2020-09-17
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Network Working Group                                              X. Xu
Internet-Draft                                             Alibaba, Inc.
Intended status: Standards Track                            H. Assarpour
Expires: March 21, 2021                                         Broadcom
                                                                   S. Ma
                                                                Mellanox
                                                                 F. Clad
                                                     Cisco Systems, Inc.
                                                      September 17, 2020

                    MPLS Payload Protocol Identifier
              draft-xu-mpls-payload-protocol-identifier-07

Abstract

   The MPLS label stack has no explicit protocol identifier field to
   indicate the protocol type of the MPLS payload.  This document
   proposes a mechanism for containing a protocol identifier field
   within the MPLS packet, which is useful for any new encapsulation
   header (e.g., INT metadata) which may need to be encapsulated with an
   MPLS header.

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
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   This Internet-Draft will expire on March 21, 2021.

Copyright Notice

   Copyright (c) 2020 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

Xu, et al.               Expires March 21, 2021                 [Page 1]
Internet-Draft          MPLS Payload Protocol ID          September 2020

   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   3
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Protocol Type Field . . . . . . . . . . . . . . . . . . . . .   3
   4.  Data Plane Processing of PIL  . . . . . . . . . . . . . . . .   4
     4.1.  Egress LSRs . . . . . . . . . . . . . . . . . . . . . . .   4
     4.2.  Ingress LSRs  . . . . . . . . . . . . . . . . . . . . . .   4
     4.3.  Transit LSRs  . . . . . . . . . . . . . . . . . . . . . .   5
     4.4.  Penultimate Hop LSRs  . . . . . . . . . . . . . . . . . .   5
   5.  Signaling for PIL Processing Capability . . . . . . . . . . .   5
   6.  Alternative Approaches  . . . . . . . . . . . . . . . . . . .   5
   7.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   6
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   6
   9.  Security Considerations . . . . . . . . . . . . . . . . . . .   6
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .   6
     10.1.  Normative References . . . . . . . . . . . . . . . . . .   6
     10.2.  Informative References . . . . . . . . . . . . . . . . .   6
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   7

1.  Introduction

   The MPLS label stack has no explicit protocol identifier field to
   indicate the protocol type of the MPLS payload.  This document
   proposes a mechanism for containing a protocol identifier field
   within the MPLS packet, which is useful for any new encapsulation
   header (e.g., INT metadata) which may need to be encapsulated with an
   MPLS header.  With this explicit protocol identifier field, there is
   no need any more for each new encapsulation header to deal with the
   notorious first nibble issue associated with MPLS individually.  More
   specifically, there is no need to intentionally avoid the first
   nibble of each new encapsulation header from being 0100 (IPv4) or
   0110 (IPv6) and even worsely misuse the first nibble of each new
   encapsulation header as an MPLS payload type field (e.g., MPLS-BIER
   [RFC8296]).  The tacit permission of misusing the first nibble of
   each new encapsulation header as an MPLS payload type field would
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