Proxy IP->MAC Advertisement in EVPNs
draft-rbickhart-evpn-ip-mac-proxy-adv-00

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Last updated 2019-03-05
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BESS Workgroup                                               R. Bickhart
Internet-Draft                                                    W. Lin
Intended status: Standards Track                                J. Drake
Expires: September 6, 2019                              Juniper Networks
                                                              J. Rabadan
                                                                   Nokia
                                                           March 5, 2019

                  Proxy IP->MAC Advertisement in EVPNs
                draft-rbickhart-evpn-ip-mac-proxy-adv-00

Abstract

   This document specifies procedures for EVPN PEs connected to a common
   multihomed site to generate proxy EVPN type 2 IP->MAC advertisements
   on behalf of other PEs to facilitate preservation of ARP/ND state
   across link or node failures.

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 September 6, 2019.

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   Copyright (c) 2019 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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   the Trust Legal Provisions and are provided without warranty as
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Table of Contents

   1.  Conventions and Terminology . . . . . . . . . . . . . . . . .   2
   2.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   3.  IP->MAC Proxy Advertisements  . . . . . . . . . . . . . . . .   3
     3.1.  Interoperation with Legacy PEs  . . . . . . . . . . . . .   5
     3.2.  Single-Active Multihoming Considerations  . . . . . . . .   5
     3.3.  MAC Route Attribute Considerations  . . . . . . . . . . .   5
   4.  EVPN ARP/ND Extended Community  . . . . . . . . . . . . . . .   5
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   6
   6.  Operational Considerations  . . . . . . . . . . . . . . . . .   6
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .   7
   8.  Normative References  . . . . . . . . . . . . . . . . . . . .   7
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   7

1.  Conventions and Terminology

   This document assumes familiarity with the terminology used in EVPN
   [RFC7432].  A few key terms used in this document are defined below:

   CE: Customer edge device.

   PE: Provider edge device.

   IP->MAC: An IP address associated with a MAC address.

   ARP: Address Resolution Protocol.

   ND: Neighbor Discovery Protocol.

   DF: Designated Forwarder.

   R-bit: Router Flag in NA messages, as per ND for IPv6 [RFC4861].

   O-bit: Override Flag in NA messages, as per ND for IPv6 [RFC4861].

2.  Introduction

   EVPN [RFC7432] allows for the distribution of IP->MAC bindings of
   connected hosts learned through IPv4 ARP and IPv6 neighbor discovery
   (ND) using type 2 MAC/IP advertisement routes.  When end hosts are
   connected to a multihomed site of an EVPN running in all-active mode,
   depending on the learning mechanisms of the multihoming PEs and the
   load balancing mechanisms implemented by the CE devices multihomed to
   the EVPN PEs, local learning of an IP->MAC may be limited to a subset

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   of the total number of multihoming PEs, possibly only a single PE
   device.  In the steady state, the IP->MAC originally learned locally
   on one or more of the set of multihoming PEs is synchronized to all
   remaining PEs attached to the same multihoming site via the EVPN
   control plane.  Once synchronized, the IP->MAC is available on each
   multihoming PE as well as other remote PEs not connected to the
   multihomed site for use in forwarding traffic or suppressing ARP or
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