Label Distribution Using ARP
draft-kompella-mpls-larp-07

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Last updated 2020-03-07
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MPLS Working Group                                           K. Kompella
Internet-Draft                                                 R. Balaji
Intended status: Standards Track                               R. Thomas
Expires: September 8, 2020                              Juniper Networks
                                                          March 07, 2020

                      Label Distribution Using ARP
                      draft-kompella-mpls-larp-07

Abstract

   This document describes extensions to the Address Resolution Protocol
   to distribute MPLS labels for IPv4 and IPv6 host addresses.
   Distribution of labels via ARP enables simple plug-and-play operation
   of MPLS, which is key to deploying MPLS in data centers and
   enterprises.

Status of This Memo

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   provisions of BCP 78 and BCP 79.

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   This Internet-Draft will expire on September 8, 2020.

Copyright Notice

   Copyright (c) 2020 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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   include Simplified BSD License text as described in Section 4.e of

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   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   2
     1.2.  Approach  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Overview of Ethernet ARP  . . . . . . . . . . . . . . . . . .   3
   3.  L-ARP Protocol Operation  . . . . . . . . . . . . . . . . . .   4
     3.1.  Setup . . . . . . . . . . . . . . . . . . . . . . . . . .   5
     3.2.  Egress Operation  . . . . . . . . . . . . . . . . . . . .   5
     3.3.  Ingress Operation . . . . . . . . . . . . . . . . . . . .   5
     3.4.  Data Plane  . . . . . . . . . . . . . . . . . . . . . . .   6
   4.  Attributes  . . . . . . . . . . . . . . . . . . . . . . . . .   6
   5.  L-ARP Message Format  . . . . . . . . . . . . . . . . . . . .   7
     5.1.  Hardware Address Format . . . . . . . . . . . . . . . . .   8
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   9
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   9
   8.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .   9
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   9
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .   9
     9.2.  Informative References  . . . . . . . . . . . . . . . . .  10
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  10

1.  Introduction

   This document describes extensions to the Address Resolution Protocol
   (ARP) [RFC0826] to advertise label bindings for IP host addresses.
   While there are well-established protocols, such as LDP, RSVP and
   BGP, that provide robust mechanisms for label distribution, these
   protocols tend to be relatively complex, and often require detailed
   configuration for proper operation.  There are situations where a
   simpler protocol may be more suitable from an operational standpoint.
   An example is the case where an MPLS Fabric is the underlay
   technology in a Data Center; here, MPLS tunnels originate from host
   machines.  The host thus needs a mechanism to acquire label bindings
   to participate in the MPLS Fabric, but in a simple, plug-and-play
   manner.  Existing signaling/routing protocols do not always meet this
   need.  Labeled ARP (L-ARP) is a proposal to fill that gap.

1.1.  Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in [RFC2119].

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