IP Point to Point Ethernet subnet model
draft-troan-6man-p2p-ethernet-00

Document Type Active Internet-Draft (individual)
Author Ole Trøan 
Last updated 2020-10-06
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Network Working Group                                           O. Troan
Internet-Draft                                                     cisco
Intended status: Informational                            6 October 2020
Expires: 9 April 2021

                IP Point to Point Ethernet subnet model
                    draft-troan-6man-p2p-ethernet-00

Abstract

   Ethernet topology is no longer a shared medium.  It is a long time
   since Ethernet has been a thick yellow cable snaking its way from
   station to station.  Ethernet is now effectively deployed in a hub
   and spoke topology.  With a point to point link between a host and
   the network device.  This memo describes a set of simplications for
   how to run IP over such links, where the physical topology is exposed
   in the network layer topology.

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 9 April 2021.

Copyright Notice

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

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Internet-Draft   IP Point to Point Ethernet subnet model    October 2020

   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
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   provided without warranty as described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Conventions and Terminology . . . . . . . . . . . . . . .   4
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  Addressing  . . . . . . . . . . . . . . . . . . . . . . . . .   4
   4.  Implications for Neighbor Discovery . . . . . . . . . . . . .   5
   5.  TODO/Open issues  . . . . . . . . . . . . . . . . . . . . . .   6
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   6
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   6
   8.  Normative References  . . . . . . . . . . . . . . . . . . . .   6
   9.  Informative References  . . . . . . . . . . . . . . . . . . .   6
   Appendix A.  Acknowledgements . . . . . . . . . . . . . . . . . .   7
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   7

1.  Introduction

   This memo describes a way of connecting network layer devices across
   Ethernet, where the physical topology is exposed to the network
   layer.  With 10BASE-T [IEEE.802-3.1990], Ethernet is a hub and spoke
   network topology with the Ethernet switch as the hub and stations as
   spokes.  While the techniques described in this document in part
   applies to a bridged or switched network, for the sake of simplicty
   of explanation only a network where all devices are IP nodes is
   considered.  Most modern Ethernet switches are also IP routers, and
   of course all Ethernet stations are IP hosts.

      |  Suspension of disbelief.  This note assumes the reader accepts
      |  that Ethernet switches can do IP routing, and for the purpose
      |  of this memo the reader should think of anything that is a
      |  "hub" in an Ethernet network as an IP router.

   This mechanism delivers complete host isolation at the network layer.
   A host only shares the same network layer link with the default
   router, and the shared subnet is only the link-local prefix.

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   The simplest example of this topology is an IP router with a set of
   Ethernet interfaces (i.e. an Ethernet L3 switch) with one port
   connecting one IP host.  Lets call this network device an "Ethernet
   Router".

   While there are many ways P2P Ethernet could be implemented, the
   simplest to explain is one where there the router has a (virtual)
   interface per station.

   If an address prefix is configured on a router's typical network
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