Stateless and Scalable Network Slice Identification for SRv6
draft-filsfils-spring-srv6-stateless-slice-id-00

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SPRING                                                  C. Filsfils, Ed.
Internet-Draft                                              F. Clad, Ed.
Intended status: Standards Track                            P. Camarillo
Expires: July 20, 2020                                           K. Raza
                                                     Cisco Systems, Inc.
                                                        January 17, 2020

      Stateless and Scalable Network Slice Identification for SRv6
            draft-filsfils-spring-srv6-stateless-slice-id-00

Abstract

   This document defines a stateless and scalable solution to achieve
   network slicing with SRv6.

Status of This Memo

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

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   This Internet-Draft will expire on July 20, 2020.

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   Copyright (c) 2020 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Slice Identifier  . . . . . . . . . . . . . . . . . . . . . .   2
   3.  Ingress PE SLID Assignment  . . . . . . . . . . . . . . . . .   2
   4.  Per-Slice Forwarding  . . . . . . . . . . . . . . . . . . . .   3
   5.  Bandwidth-Allocation Slice  . . . . . . . . . . . . . . . . .   3
   6.  Backward Compatibility  . . . . . . . . . . . . . . . . . . .   3
   7.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   4
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   4
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .   4
     8.2.  Informative References  . . . . . . . . . . . . . . . . .   4
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   4

1.  Introduction

   SRv6 Network Programming[I-D.ietf-spring-srv6-network-programming]
   enables the creation of overlays with underlay optimization to be
   deployed in an SR domain[RFC8402].

   As defined in [I-D.ietf-6man-segment-routing-header], all inter-
   domain packets are encapsulated for the part of the packet journey
   that is within the SR domain.  The outer IPv6 header is originated by
   a node of the SR domain and is destined to a node of the SR domain.

   This document describes a stateless encoding of slice identification
   in the outer IPv6 header of an SR domain.  The slice identification
   is independent of topology and the QoS/DiffServ policy of the
   network, thus enabling scalable network slicing for SRv6 overlays.

2.  Slice Identifier

   Each network slice in an SR domain is uniquely identified by an 8-bit
   Slice Identifier (SLID).

3.  Ingress PE SLID Assignment

   When an ingress PE receives a packet that traverses the SR domain, it
   encapsulates the packet in an outer IPv6 header and optional SRH as
   defined in [I-D.ietf-6man-segment-routing-header].  The ingress PE
   MAY also classify the packet into a slice and set the slice
   identifier as follows:

   o  Set the SPI bit (SLID Presence Indicator) in the Traffic Class
      field of the outer IPv6 header.

   o  Write this SLID in the 8 most significant bits of the Flow Label
      field of the outer IPv6 header.  The remaining 12 bits of the Flow

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      Label field were set as described in section 5.5 of
      [I-D.ietf-6man-segment-routing-header] for inter-domain packets.

   The slice classification method is outside the scope of this
   document.

   The choice of the SPI bit from within the IPv6 Traffic Class field is
   a domain-wide configuration and is outside the scope of this
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