Architecture for Overlay Virtual Sub-Network Interconnection
draft-ao-nvo3-overlay-subnet-architecture-01

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NVO3 WG                                                            T. Ao
Internet-Draft                                           ZTE Corporation
Intended status: Standards Track                               G. Mirsky
Expires: November 6, 2019                                      ZTE Corp.
                                                                  Y. Fan
                                                           China Telecom
                                                             May 5, 2019

      Architecture for Overlay Virtual Sub-Network Interconnection
              draft-ao-nvo3-overlay-subnet-architecture-01

Abstract

   An virtualized overlay network may be divided into several subnets
   for the reasons of geographical location, management, or using
   different technologies being used.  For example, different customer
   have their own preference.  But all these subnets need to work
   together to provide an end-to-end connectionif in a virtual network,
   An extended architecture of the NVO3 and propose a new component to
   provide the connection fucntion are introduced in this document.

Status of This Memo

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   This Internet-Draft will expire on November 6, 2019.

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Ao, et al.              Expires November 6, 2019                [Page 1]
Internet-Draft            overlay interconnect                  May 2019

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Table of Contents

   1.  Background  . . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Conventions used in this document . . . . . . . . . . . . . .   3
     2.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
     2.2.  Requirements Language . . . . . . . . . . . . . . . . . .   4
   3.  Architecture for subnet . . . . . . . . . . . . . . . . . . .   4
     3.1.  Stitching NVE . . . . . . . . . . . . . . . . . . . . . .   5
   4.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   7
   5.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   7
     5.1.  Normative References  . . . . . . . . . . . . . . . . . .   7
     5.2.  Informational References  . . . . . . . . . . . . . . . .   8
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   8

1.  Background

   Network virtualization using Overlays over Layer 3 (NVO3) is a
   technology that is used to address issues that arise in building
   large, multi-tenant data centers that make extensive use of server
   virtualization.

   As described [I-D.defoy-coms-subnet-interconnection] and
   [I-D.homma-coms-slice-gateway], for network slicing in 5G, there are
   number of reasons to compose an end-to-end network slice instance by
   using subnets and stitching operations, thus enabling hierarchical/
   recursive management of slices.  These subnets are the part of the
   network slice instance, but not isolate from network slice.  An
   overlay virtual network may also be constructed of several subnets.
   In such scenario, subnets interconnection to a virtual network is
   required.  We also can consider such interconnection as stitiching.
   With such stitiching, several subnets can provide a end to end
   connection in an overlay virtual network.

   Moreover, with the progress in NVO3 WG, some of the data plane
   encapsulations have been put forward, some are outstanding dataplane
   for an overlay network, such as VxLAN-GPE [I-D.ietf-nvo3-vxlan-gpe],
   GENEVE [I-D.ietf-nvo3-geneve] and GUE [I-D.ietf-nvo3-encap], etc.
   The consideration about these overlay encapsulations has been
   analyzed in [I-D.ietf-nvo3-encap].  The fact is that each of them has
   its custmers, and furthermore, some of them have been already
   deployed in the network.  So that a problem arises: for a virtual