Propagation of IPv6 Neighbor Advertisement Flags in EVPN
draft-ietf-bess-evpn-na-flags-02

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BESS Workgroup                                           J. Rabadan, Ed.
Internet Draft                                              S. Sathappan
                                                              K. Nagaraj
Intended status: Standards Track                                   Nokia

Expires: April 22, 2019                                 October 19, 2018

        Propagation of IPv6 Neighbor Advertisement Flags in EVPN
                    draft-ietf-bess-evpn-na-flags-02

Abstract

   The MAC/IP Advertisement route specified in [RFC7432] 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 and
   reduce/suppress the flooding produced by the Address Resolution
   procedure. However, if the Neighbor information is learnt via EVPN,
   the PE would not know if a particular IPv6->MAC pair belongs to a
   host, a router or a host with an anycast address as this information
   is not carried in the MAC/IP route advertisements. This document
   proposes an OPTIONAL advertisement of the Flags defined in [RFC4861]
   along with the EVPN MAC/IP Advertisement routes, so that an EVPN PE
   implementing a proxy-ND function can reply to Neighbor Solicitations
   with the correct Flag information in Neighbor Advertisements.

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
   and may be updated, replaced, or obsoleted by other documents

 

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   This Internet-Draft will expire on April 22, 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
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   (http://trustee.ietf.org/license-info) in effect on the date of
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   described in the Simplified BSD License.

Table of Contents

   1. Introduction  . . . . . . . . . . . . . . . . . . . . . . . . .  3
   2. The EVPN Neighbor Discovery (ND) Extended Community . . . . . .  3
   3. Use of the EVPN ND Extended Community . . . . . . . . . . . . .  4
   4. Conventions used in this document . . . . . . . . . . . . . . .  4
   5. Security Considerations . . . . . . . . . . . . . . . . . . . .  5
   6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . .  5
   7. References  . . . . . . . . . . . . . . . . . . . . . . . . . .  5
     7.1. Normative References  . . . . . . . . . . . . . . . . . . .  5
     7.2. Informative References  . . . . . . . . . . . . . . . . . .  5
   8. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . .  5
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . .  6

 

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1. Introduction

   The MAC/IP Advertisement route specified in [RFC7432] 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 and
   reduce/suppress the flooding produced by the Address Resolution
   procedure. However, if the Neighbor information is learned via EVPN,
   the PE would not know if a particular IPv6->MAC pair belongs to a
   host or a router as this information is not carried in the MAC/IP
   route advertisements. 

   This document proposes the OPTIONAL advertisement of the Flags
   defined in [RFC4861] along with the EVPN MAC/IP Advertisement routes,
   so that an EVPN PE implementing a proxy-ND function can issue