AC-Influenced Designated Forwarder Election for EVPN
draft-ietf-bess-evpn-ac-df-01

Document Type Active Internet-Draft (bess WG)
Last updated 2017-04-11
Replaces draft-rabadan-bess-evpn-ac-df
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BESS Workgroup                                                J. Rabadan
Internet Draft                                                K. Nagaraj
                                                            S. Sathappan
Intended status: Informational                                 V. Prabhu
                                                           W. Henderickx
                                                                   Nokia

                                                                  A. Liu
                                                                Ericsson

                                                                  W. Lin
                                                        Juniper Networks

Expires: October 13, 2017                                 April 11, 2017

          AC-Influenced Designated Forwarder Election for EVPN
                     draft-ietf-bess-evpn-ac-df-01

Abstract

   The Designated Forwarder (DF) in EVPN networks is the PE responsible
   for sending multicast, broadcast and unknown unicast traffic to a
   multi-homed CE, on a given Ethernet Tag on a particular Ethernet
   Segment (ES). The DF is selected based on the list of PEs that
   advertise the Ethernet Segment Identifier (ESI) to the EVPN network.
   While PE node or link failures trigger the DF re-election for a given
   <ESI, EVI>, individual Attachment Circuit (AC) or MAC-VRF failures do
   not trigger such DF re-election and the traffic may therefore be
   permanently impacted, even though there is an alternative path. This
   document improves the DF election algorithm so that the AC status can
   influence the result of the election and this type of "logical"
   failures can be protected too.

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
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   Drafts.

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Rabadan et al.          Expires October 13, 2017                [Page 1]
Internet-Draft       AC-based DF election for EVPN        April 11, 2017

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Copyright Notice

   Copyright (c) 2017 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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Table of Contents

   1. Problem Statement . . . . . . . . . . . . . . . . . . . . . . .  3
   2. Solution Description  . . . . . . . . . . . . . . . . . . . . .  4
     2.1. Current DF Election Procedure And AC Failures . . . . . . .  5
     2.2. The Attachment Circuit (AC) Influenced DF Election  . . . .  6
     2.3. AC-Influenced DF Election For VLAN-Aware Bundle Services  .  7
   3. Solution benefits . . . . . . . . . . . . . . . . . . . . . . .  8
   4. Conventions used in this document . . . . . . . . . . . . . . .  8
   5. Security Considerations . . . . . . . . . . . . . . . . . . . .  8
   6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . .  8
   7. References  . . . . . . . . . . . . . . . . . . . . . . . . . .  9
     7.1. Normative References  . . . . . . . . . . . . . . . . . . .  9
     7.2. Informative References  . . . . . . . . . . . . . . . . . .  9
   8. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . .  9
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . .  9

 

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1. Problem Statement

   [RFC7432] defines the Designated Forwarder (DF) as the EVPN PE
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