Multi-purpose Special Purpose Label for Forwarding Actions
draft-kompella-mpls-mspl4fa-00

Document Type Active Internet-Draft (individual)
Authors Kireeti Kompella  , Vishnu Beeram  , Tarek Saad  , Israel Meilik 
Last updated 2021-02-22
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MPLS WG                                                      K. Kompella
Internet-Draft                                                 V. Beeram
Intended status: Standards Track                                 T. Saad
Expires: August 26, 2021                                Juniper Networks
                                                               I. Meilik
                                                                Broadcom
                                                       February 22, 2021

       Multi-purpose Special Purpose Label for Forwarding Actions
                     draft-kompella-mpls-mspl4fa-00

Abstract

   A Slice Selector is packet metadata that dictates the packet's
   forwarding handling in order to conform to its slice requirements.
   There are multiple proposals for carrying slice selectors in MPLS
   networks.  One of the more practical proposals is the "Global
   Identifier for Slice Selector" (GISS).  Global uniqueness requires
   the GISS label be identified as such, via a special purpose label
   (ideally a base special purpose label (bSPL)).  However, bSPLs are a
   precious commodity, and there are many requests for them.  This
   document serves two purposes: to define a bSPL for carrying a GISS,
   and to show how this bSPL can consolidate many current requests for
   special purpose labels while carrying associated data compactly and
   efficiently.

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 August 26, 2021.

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Copyright Notice

   Copyright (c) 2021 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
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   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
     1.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
     1.2.  Slice Selector  . . . . . . . . . . . . . . . . . . . . .   3
   2.  Multi-purpose bSPL: the Forwarding Actions Indicator  . . . .   3
     2.1.  The FAI bSPL  . . . . . . . . . . . . . . . . . . . . . .   4
   3.  Issues to be Resolved . . . . . . . . . . . . . . . . . . . .   7
     3.1.  Preventing FAI From Reaching Top of Stack . . . . . . . .   7
     3.2.  Repeating the FAI at "Readable Stack Depth" . . . . . . .   8
     3.3.  First Nibble Issues . . . . . . . . . . . . . . . . . . .   8
   4.  Contributors  . . . . . . . . . . . . . . . . . . . . . . . .   8
   5.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .   8
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   8
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .   9
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   9
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .   9
     8.2.  Informative References  . . . . . . . . . . . . . . . . .  10
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  10

1.  Introduction

   Network slicing is an important ongoing effort both for network
   design, as well as for standardization, in particular at the IETF
   [I-D.nsdt-teas-ns-framework].  A key issue is identifying which slice
   a packet belongs to, by means of a "slice selector" carried in the
   packet header.  [I-D.bestbar-teas-ns-packet] describes several such
   methods for MPLS networks, of which the Global Identifier for Slice
   Selector (GISS) is one of the more practical solutions.  This
   document shows how to realize the GISS using a base special purpose
   label (bSPL).

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