MPLS Payload Protocol Identifier
draft-xu-mpls-payload-protocol-identifier-02

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Last updated 2016-12-26
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Network Working Group                                              X. Xu
Internet-Draft                                                    Huawei
Intended status: Standards Track                       December 26, 2016
Expires: June 29, 2017

                    MPLS Payload Protocol Identifier
              draft-xu-mpls-payload-protocol-identifier-02

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 which may need to be encapsulated with an MPLS header.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
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   This Internet-Draft will expire on June 29, 2017.

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   Copyright (c) 2016 IETF Trust and the persons identified as the
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Xu                        Expires June 29, 2017                 [Page 1]
Internet-Draft          MPLS Payload Protocol ID           December 2016

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   2
   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  . . . . . . . . . . . . . . . . . . . . . .   5
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   6
   9.  Security Considerations . . . . . . . . . . . . . . . . . . .   6
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .   6
     10.1.  Normative References . . . . . . . . . . . . . . . . . .   6
     10.2.  Informative References . . . . . . . . . . . . . . . . .   6
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   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 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).
   Furthermore, there is no need to insert one additional label
   indicating the MPLS payloads when transporting any new encapsulation
   header over MPLS LSPs (e.g., transporting Network Service Header
   (NSH) [I-D.ietf-sfc-nsh] over MPLS LSPs ).

1.1.  Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
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