Proxy IP->MAC Advertisement in EVPNs
draft-rbickhart-evpn-ip-mac-proxy-adv-01

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BESS Workgroup                                               R. Bickhart
Internet-Draft                                                    Twitch
Intended status: Standards Track                                  W. Lin
Expires: July 26, 2020                                          J. Drake
                                                        Juniper Networks
                                                              J. Rabadan
                                                                   Nokia
                                                                   A. Lo
                                                         Arista Networks
                                                        January 23, 2020

                  Proxy IP->MAC Advertisement in EVPNs
                draft-rbickhart-evpn-ip-mac-proxy-adv-01

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.

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   This Internet-Draft will expire on July 26, 2020.

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   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
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   publication of this document.  Please review these documents

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   carefully, as they describe your rights and restrictions with respect
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   described in the Simplified BSD License.

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
     3.4.  Symmetric IRB Considerations  . . . . . . . . . . . . . .   6
   4.  EVPN ARP/ND Extended Community  . . . . . . . . . . . . . . .   6
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   7
   6.  Operational Considerations  . . . . . . . . . . . . . . . . .   7
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .   7
   8.  Normative References  . . . . . . . . . . . . . . . . . . . .   7
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   8

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

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   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
   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
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