Operational Aspects of Proxy-ARP/ND in EVPN Networks
draft-ietf-bess-evpn-proxy-arp-nd-05

Document Type Active Internet-Draft (bess WG)
Last updated 2018-11-04
Replaces draft-snr-bess-evpn-proxy-arp-nd
Stream IETF
Intended RFC status Informational
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BESS Workgroup                                           J. Rabadan, Ed.
Internet Draft                                              S. Sathappan
                                                              K. Nagaraj
Intended status: Informational                             W. Henderickx
                                                              G. Hankins
                                                                   Nokia

                                                                 T. King
                                                               D. Melzer
                                                                  DE-CIX

                                                             E. Nordmark
                                                              Individual

Expires: May 9, 2019                                    November 5, 2018

          Operational Aspects of Proxy-ARP/ND in EVPN Networks
                  draft-ietf-bess-evpn-proxy-arp-nd-05

Abstract

   The EVPN MAC/IP Advertisement route can optionally carry IPv4 and
   IPv6 addresses associated with a MAC address. Remote PEs can use this
   information to reply locally (act as proxy) to IPv4 ARP requests and
   IPv6 Neighbor Solicitation messages (or 'unicast-forward' them to the
   owner of the MAC) and reduce/suppress the flooding produced by the
   Address Resolution procedure. This EVPN capability is extremely
   useful in Internet Exchange Points (IXPs) and Data Centers (DCs) with
   large broadcast domains, where the amount of ARP/ND flooded traffic
   causes issues on routers and CEs. This document describes how the
   EVPN Proxy-ARP/ND function may be implemented to help IXPs and other
   operators deal with the issues derived from Address Resolution in
   large broadcast domains.

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
   Task Force (IETF), its areas, and its working groups.  Note that
   other groups may also distribute working documents as Internet-
   Drafts.

   Internet-Drafts are draft documents valid for a maximum of six months
 

Sathappan-Nagaraj-Rabadan et al.Expires May 9, 2019             [Page 1]
Internet-Draft             EVPN Proxy-ARP/ND            November 5, 2018

   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
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   The list of Internet-Draft Shadow Directories can be accessed at
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   This Internet-Draft will expire on May 9, 2019.

Copyright Notice

   Copyright (c) 2018 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
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document. Please review these documents
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   described in the Simplified BSD License.

Table of Contents

   1. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . .  3
   2. Introduction  . . . . . . . . . . . . . . . . . . . . . . . . .  4
     2.1. The DC Use-Case . . . . . . . . . . . . . . . . . . . . . .  5
     2.2. The IXP Use-Case  . . . . . . . . . . . . . . . . . . . . .  5
   3. Solution Requirements . . . . . . . . . . . . . . . . . . . . .  6
   4. Solution Description  . . . . . . . . . . . . . . . . . . . . .  7
     4.1. Learning Sub-Function . . . . . . . . . . . . . . . . . . .  9
       4.1.1. Proxy-ND and the NA Flags . . . . . . . . . . . . . . . 10
     4.2. Reply Sub-Function  . . . . . . . . . . . . . . . . . . . . 11
     4.3. Unicast-forward Sub-Function  . . . . . . . . . . . . . . . 12
     4.4. Maintenance Sub-Function  . . . . . . . . . . . . . . . . . 13
     4.5. Flooding (to Remote PEs) Reduction/Suppression  . . . . . . 14
     4.6. Duplicate IP Detection  . . . . . . . . . . . . . . . . . . 14
   5. Solution Benefits . . . . . . . . . . . . . . . . . . . . . . . 16
   6. Deployment Scenarios  . . . . . . . . . . . . . . . . . . . . . 17
     6.1. All Dynamic Learning  . . . . . . . . . . . . . . . . . . . 17
     6.2. Dynamic Learning with Proxy-ARP/ND  . . . . . . . . . . . . 17
     6.3. Hybrid Dynamic Learning and Static Provisioning with 
          Proxy-ARP/ND  . . . . . . . . . . . . . . . . . . . . . . . 18
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