AC-influenced Designated Forwarder Election for EVPN
draft-rabadan-bess-evpn-ac-df-03

The information below is for an old version of the document
Document Type Active Internet-Draft (individual)
Authors Jorge Rabadan  , Kiran Nagaraj  , Senthil Sathappan  , Vinod Prabhu  , Wim Henderickx  , Autumn Liu 
Last updated 2016-01-11
Replaced by draft-ietf-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
                                                          Alcatel-Lucent

                                                                  A. Liu
                                                                Ericsson

Expires: July 14, 2016                                  January 11, 2016

          AC-influenced Designated Forwarder Election for EVPN
                    draft-rabadan-bess-evpn-ac-df-03

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
   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 at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."
 

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   Copyright (c) 2016 IETF Trust and the persons identified as the
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Table of Contents

   1. Problem Statement . . . . . . . . . . . . . . . . . . . . . . .  2
   2. Solution description  . . . . . . . . . . . . . . . . . . . . .  4
     2.1. Current DF election procedure and AC failures . . . . . . .  5
     2.2. The Attachment Circuit (AC) influenced DF election  . . . .  5
   3. Solution benefits . . . . . . . . . . . . . . . . . . . . . . .  7
   4. Conventions used in this document . . . . . . . . . . . . . . .  7
   5. Security Considerations . . . . . . . . . . . . . . . . . . . .  7
   6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . .  7
   7. References  . . . . . . . . . . . . . . . . . . . . . . . . . .  7
     7.1. Normative References  . . . . . . . . . . . . . . . . . . .  7
     7.2. Informative References  . . . . . . . . . . . . . . . . . .  8
   8. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . .  8
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . .  8

1. Problem Statement

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

 

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   o Flooding Broadcast, Unknown unicast and Multicast traffic (BUM), on
     a given Ethernet Tag on a particular Ethernet Segment (ES), to the
     CE. This is valid for single-active and all-active EVPN
     multi-homing.

   o Sending unicast traffic on a given Ethernet Tag on a particular ES
     to the CE. This is valid for single-active multi-homing.
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