Segment Routing IPv6 for Mobile User Plane
draft-ietf-dmm-srv6-mobile-uplane-02

Document Type Active Internet-Draft (dmm WG)
Last updated 2018-07-02
Replaces draft-matsushima-spring-dmm-srv6-mobile-uplane
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DMM Working Group                                          S. Matsushima
Internet-Draft                                                  SoftBank
Intended status: Standards Track                             C. Filsfils
Expires: January 3, 2019                                        M. Kohno
                                                            P. Camarillo
                                                     Cisco Systems, Inc.
                                                                D. Voyer
                                                             Bell Canada
                                                              C. Perkins
                                                               Futurewei
                                                            July 2, 2018

               Segment Routing IPv6 for Mobile User Plane
                  draft-ietf-dmm-srv6-mobile-uplane-02

Abstract

   This document discusses the applicability of SRv6 (Segment Routing
   IPv6) to user-plane of mobile networks (N3 and N9 interfaces).  The
   source routing capability and the network programming nature of SRv6,
   accomplish mobile user-plane functions in a simple manner.  The
   statelessness and the ability to control underlying layer will be
   even more beneficial to the mobile user-plane, in terms of providing
   flexibility and SLA control for various applications.  It also
   simplifies the network architecture by eliminating the necessity of
   tunnels, such as GTP-U [TS.29281], PMIP [RFC5213], Mac-in-Mac, MPLS,
   and so on.  In addition, Segment Routing provides an enhanced method
   for network slicing, which is briefly introduced by this document.

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 January 3, 2019.

Matsushima, et al.       Expires January 3, 2019                [Page 1]
Internet-Draft             SRv6-mobile-uplane                  July 2018

Copyright Notice

   Copyright (c) 2018 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
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Conventions and Terminology . . . . . . . . . . . . . . . . .   3
   3.  Motivation  . . . . . . . . . . . . . . . . . . . . . . . . .   4
   4.  Reference Architecture  . . . . . . . . . . . . . . . . . . .   5
   5.  User-plane behaviors  . . . . . . . . . . . . . . . . . . . .   6
     5.1.  Traditional mode (formerly Basic mode)  . . . . . . . . .   7
       5.1.1.  Packet flow - Uplink  . . . . . . . . . . . . . . . .   7
       5.1.2.  Packet flow - Downlink  . . . . . . . . . . . . . . .   8
       5.1.3.  IPv6 user-traffic . . . . . . . . . . . . . . . . . .   8
     5.2.  Enhanced Mode (formerly Aggregate mode) . . . . . . . . .   8
       5.2.1.  Packet flow - Uplink  . . . . . . . . . . . . . . . .   9
       5.2.2.  Packet flow - Downlink  . . . . . . . . . . . . . . .  10
       5.2.3.  IPv6 user-traffic . . . . . . . . . . . . . . . . . .  10
     5.3.  Enhanced mode with unchanged gNB GTP behavior . . . . . .  11
       5.3.1.  Interworking with IPv6 GTP  . . . . . . . . . . . . .  11
       5.3.2.  Interworking with IPv4 GTP  . . . . . . . . . . . . .  14
       5.3.3.  Extensions to the interworking mechanisms . . . . . .  17
   6.  SRv6 SID Mobility Functions . . . . . . . . . . . . . . . . .  17
     6.1.  End.MAP: Endpoint function with SID mapping . . . . . . .  17
     6.2.  End.M.GTP6.D: Endpoint function with decapsulation from
           IPv6/GTP tunnel . . . . . . . . . . . . . . . . . . . . .  17
     6.3.  End.M.GTP6.E: Endpoint function with encapsulation for
           IPv6/GTP tunnel . . . . . . . . . . . . . . . . . . . . .  18
     6.4.  End.M.GTP4.E: Endpoint function with encapsulation for
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